Add config and command executor

Signed-off-by: Slendi <slendi@socopon.com>

.clangd

@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-Wno-c23-extensions]

.gitignore

@@ -1,4 +1,5 @@
 [Bb]uild*
+CMakeLists.txt.*
 result
 .cache
 .direnv

CMakeLists.txt

@@ -1,10 +1,25 @@
 cmake_minimum_required(VERSION 3.16)
+
 project(waylight LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
+find_program(cppcheck_exe NAMES cppcheck)
+if (cppcheck_exe)
+	set(cppcheck_opts --enable=all --inline-suppr --quiet --suppressions-list=${PROJECT_SOURCE_DIR}/cppcheck.supp)
+	add_custom_target(run_cppcheck
+		COMMAND ${cppcheck_exe}
+			--std=c++20 --enable=all --inline-suppr --quiet
+			--suppressions-list=${PROJECT_SOURCE_DIR}/cppcheck.supp
+			--project=${CMAKE_BINARY_DIR}/compile_commands.json
+			--check-level=exhaustive
+			-i ${CMAKE_BINARY_DIR}
+		WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+	)
+endif()
+
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(WAYLAND_CLIENT REQUIRED IMPORTED_TARGET wayland-client)
 pkg_check_modules(WAYLAND_EGL REQUIRED IMPORTED_TARGET wayland-egl)
@@ -34,6 +49,7 @@ FetchContent_MakeAvailable(raylib)
 FetchContent_Declare(
 	msdfgen
 	GIT_REPOSITORY https://github.com/Chlumsky/msdfgen.git
+	GIT_TAG "v1.12.1"
 	GIT_SHALLOW 1
 )
 set(MSDFGEN_BUILD_STANDALONE OFF)
@@ -43,6 +59,48 @@ set(MSDFGEN_DISABLE_SVG ON)
 set(MSDFGEN_DISABLE_PNG ON)
 FetchContent_MakeAvailable(msdfgen)
 
+FetchContent_Declare(
+	mINI
+	GIT_REPOSITORY https://github.com/metayeti/mINI.git
+	GIT_TAG "0.9.18"
+	GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(mINI)
+
+FetchContent_Declare(
+	lunasvg
+	GIT_REPOSITORY https://github.com/sammycage/lunasvg.git
+	GIT_TAG "v3.5.0"
+	GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(lunasvg)
+
+FetchContent_Declare(
+	SQLiteCpp
+	GIT_REPOSITORY https://github.com/SRombauts/SQLiteCpp.git
+	GIT_TAG "3.3.3"
+	GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(SQLiteCpp)
+
+FetchContent_Declare(
+	cpptrace
+	GIT_REPOSITORY https://github.com/jeremy-rifkin/cpptrace.git
+	GIT_TAG "v1.0.1"
+	GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(cpptrace)
+
+FetchContent_Declare(
+	tomlplusplus
+	GIT_REPOSITORY https://github.com/marzer/tomlplusplus
+	GIT_TAG "v3.4.0"
+	GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(tomlplusplus)
+
+add_subdirectory(vendor)
+
 find_program(WAYLAND_SCANNER wayland-scanner REQUIRED)
 
 pkg_get_variable(WAYLAND_PROTOCOLS_DIR wayland-protocols pkgdatadir)
@@ -92,17 +150,23 @@ set(WLR_LAYER_SHELL_XML
 	"${WLR_PROTOCOLS_DIR}/unstable/wlr-layer-shell-unstable-v1.xml"
 )
 
+set(TEXT_INPUT_XML
+	"${WAYLAND_PROTOCOLS_DIR}/unstable/text-input/text-input-unstable-v3.xml"
+)
+
 set(GEN_C_HEADERS
 	"${GEN_DIR}/xdg-shell-client-protocol.h"
 	"${GEN_DIR}/wlr-layer-shell-unstable-v1-client-protocol.h"
 	"${GEN_DIR}/ext-background-effect-v1-client-protocol.h"
 	"${GEN_DIR}/blur-client-protocol.h"
+	"${GEN_DIR}/text-input-unstable-v3-client-protocol.h"
 )
 set(GEN_C_PRIVATES
 	"${GEN_DIR}/xdg-shell-protocol.c"
 	"${GEN_DIR}/wlr-layer-shell-unstable-v1-protocol.c"
 	"${GEN_DIR}/ext-background-effect-v1-protocol.c"
 	"${GEN_DIR}/blur-protocol.c"
+	"${GEN_DIR}/text-input-unstable-v3-protocol.c"
 )
 
 add_custom_command(
@@ -115,10 +179,13 @@ add_custom_command(
 	# wlr-layer-shell
 	COMMAND "${WAYLAND_SCANNER}" client-header "${WLR_LAYER_SHELL_XML}" "${GEN_DIR}/wlr-layer-shell-unstable-v1-client-protocol.h"
 	COMMAND "${WAYLAND_SCANNER}" private-code  "${WLR_LAYER_SHELL_XML}" "${GEN_DIR}/wlr-layer-shell-unstable-v1-protocol.c"
+	# text-input-unstable-v3
+	COMMAND "${WAYLAND_SCANNER}" client-header "${TEXT_INPUT_XML}" "${GEN_DIR}/text-input-unstable-v3-client-protocol.h"
+	COMMAND "${WAYLAND_SCANNER}" private-code  "${TEXT_INPUT_XML}" "${GEN_DIR}/text-input-unstable-v3-protocol.c"
 	# org-kde-win-blur
 	COMMAND "${WAYLAND_SCANNER}" client-header "${CMAKE_CURRENT_SOURCE_DIR}/blur.xml" "${GEN_DIR}/blur-client-protocol.h"
 	COMMAND "${WAYLAND_SCANNER}" private-code  "${CMAKE_CURRENT_SOURCE_DIR}/blur.xml" "${GEN_DIR}/blur-protocol.c"
-	DEPENDS "${XDG_SHELL_XML}" "${WLR_LAYER_SHELL_XML}"
+	DEPENDS "${XDG_SHELL_XML}" "${WLR_LAYER_SHELL_XML}" "${TEXT_INPUT_XML}"
 	COMMENT "Generating Wayland + wlr-layer-shell client headers and private code"
 	VERBATIM
 )
@@ -130,8 +197,13 @@ add_custom_target(generate_protocols ALL
 add_executable(waylight
 	${GEN_C_PRIVATES}
 
-	${CMAKE_CURRENT_SOURCE_DIR}/src/App.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/Config.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/IconRegistry.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/Cache.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/InotifyWatcher.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/TextRenderer.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/ImGui.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/App.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/Tick.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp
 )
@@ -152,8 +224,15 @@ target_link_libraries(waylight PRIVATE
 	PkgConfig::FONTCONFIG
 	PkgConfig::HARFBUZZ
 
+	tomlplusplus::tomlplusplus
+	cpptrace::cpptrace
+	tinyfiledialogs
+	mINI
 	raylib
 	msdfgen::msdfgen-core
+	msdfgen::msdfgen-ext
+	lunasvg::lunasvg
+	SQLiteCpp
 
 	m
 	dl

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
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+
+  An "entity transaction" is a transaction transferring control of an
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+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
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+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

cppcheck.supp

@@ -0,0 +1,8 @@
+unusedFunction
+shadowFunction
+missingIncludeSystem
+ignoredReturnValue
+
+*:build/generated/*
+*:build/_deps/*
+*:vendor/*

flake.nix

@@ -16,7 +16,22 @@
       system:
       let
         pkgs = import nixpkgs { inherit system; };
-        nativeBuildInputs = [ ];
+        nativeBuildInputs = with pkgs; [
+          pkg-config
+          wayland
+          wayland-protocols
+          wlr-protocols
+          wayland-scanner
+          libGL
+          libportal
+          glib
+          libxkbcommon
+          fontconfig
+          harfbuzz
+          sqlite
+	  zenity
+	  boost
+        ];
         buildInputs = with pkgs; [
           cmake
           ninja
@@ -31,23 +46,12 @@
                 [
                   llvmPackages_21.clang-tools
                   lldb
+                  gdb
                   codespell
                   doxygen
                   gtest
                   cppcheck
                   inotify-tools
-
-                  pkg-config
-                  wayland
-                  wayland-protocols
-                  wlr-protocols
-                  wayland-scanner
-                  libGL
-                  libportal
-                  glib
-                  libxkbcommon
-                  fontconfig
-                  harfbuzz
                 ]
                 ++ buildInputs
                 ++ nativeBuildInputs

src/App.cpp

@@ -1,17 +1,24 @@
 #include "App.hpp"
 
+#include <algorithm>
 #include <cassert>
 #include <chrono>
+#include <cmath>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 #include <poll.h>
+#include <print>
 #include <pthread.h>
+#include <ranges>
 #include <signal.h>
+#include <span>
 #include <sys/mman.h>
 #include <sys/signalfd.h>
 #include <thread>
 #include <unistd.h>
+#include <unordered_set>
+#include <vector>
 
 #include <GLES3/gl3.h>
 #include <fontconfig/fontconfig.h>
@@ -27,6 +34,84 @@
 #include "blur-client-protocol.h"
 #include "ext-background-effect-v1-client-protocol.h"
 
+namespace Waylight {
+
+namespace {
+
+constexpr usize MAX_SURROUNDING_BYTES = 4000;
+
+inline auto is_utf8_continuation(char c) -> bool
+{
+	return (static_cast<unsigned char>(c) & 0xC0) == 0x80;
+}
+
+inline auto adjust_utf8_backward(std::string const &text, int index) -> int
+{
+	index = std::clamp(index, 0, static_cast<int>(text.size()));
+	while (
+	    index > 0 && is_utf8_continuation(text[static_cast<usize>(index - 1)]))
+		--index;
+	return index;
+}
+
+inline auto adjust_utf8_forward(std::string const &text, int index) -> int
+{
+	int const size = static_cast<int>(text.size());
+	index = std::clamp(index, 0, size);
+	while (
+	    index < size && is_utf8_continuation(text[static_cast<usize>(index)]))
+		++index;
+	return index;
+}
+
+struct SurroundingSlice {
+	std::string text;
+	int cursor { 0 };
+	int anchor { 0 };
+};
+
+auto clamp_surrounding_text(std::string const &text, int cursor, int anchor)
+    -> SurroundingSlice
+{
+	int const size = static_cast<int>(text.size());
+	cursor = std::clamp(cursor, 0, size);
+	anchor = std::clamp(anchor, 0, size);
+
+	if (text.size() <= MAX_SURROUNDING_BYTES) {
+		return SurroundingSlice { text, cursor, anchor };
+	}
+
+	int window_start = std::max(0,
+	    std::min(cursor, anchor) - static_cast<int>(MAX_SURROUNDING_BYTES / 2));
+	int window_end = window_start + static_cast<int>(MAX_SURROUNDING_BYTES);
+	int const max_pos = std::max(cursor, anchor);
+	if (window_end < max_pos) {
+		window_end = max_pos;
+		window_start
+		    = std::max(0, window_end - static_cast<int>(MAX_SURROUNDING_BYTES));
+	}
+	if (window_end > size)
+		window_end = size;
+	if (window_end - window_start > static_cast<int>(MAX_SURROUNDING_BYTES)) {
+		window_start = window_end - static_cast<int>(MAX_SURROUNDING_BYTES);
+	}
+
+	window_start = adjust_utf8_backward(text, window_start);
+	window_end = adjust_utf8_forward(text, window_end);
+	if (window_end < window_start)
+		window_end = window_start;
+
+	std::string slice(text.begin() + window_start, text.begin() + window_end);
+	int const new_cursor
+	    = std::clamp(cursor - window_start, 0, static_cast<int>(slice.size()));
+	int const new_anchor
+	    = std::clamp(anchor - window_start, 0, static_cast<int>(slice.size()));
+
+	return SurroundingSlice { std::move(slice), new_cursor, new_anchor };
+}
+
+} // namespace
+
 auto TypingBuffer::push_utf8(char const *s) -> void
 {
 	for (unsigned char const *p = reinterpret_cast<unsigned char const *>(s);
@@ -58,6 +143,73 @@ App::App()
 	init_egl();
 	init_signal();
 	init_theme_portal();
+
+	{
+		auto const env = getenv("XDG_DATA_HOME");
+		if (env && *env) {
+			if (std::filesystem::exists(env)) {
+				m_data_home_dir = env;
+			}
+		}
+		if (m_data_home_dir.empty()) {
+			auto const home = getenv("HOME");
+			assert(home && *home);
+			m_data_home_dir = std::filesystem::path(home) / ".local" / "share";
+			std::filesystem::create_directories(m_data_home_dir);
+		}
+		m_data_home_dir /= "waylight";
+		std::filesystem::create_directories(m_data_home_dir);
+	}
+
+	{
+		auto const env = getenv("XDG_CONFIG_HOME");
+		if (env && *env) {
+			if (std::filesystem::exists(env)) {
+				m_config_home_dir = env;
+			}
+		}
+		if (m_config_home_dir.empty()) {
+			auto const home = getenv("HOME");
+			assert(home && *home);
+			m_config_home_dir = std::filesystem::path(home) / ".config";
+			std::filesystem::create_directories(m_config_home_dir);
+		}
+		m_config_home_dir /= "waylight";
+		std::filesystem::create_directories(m_config_home_dir);
+
+		m_config = Config::load(m_config_home_dir);
+	}
+
+	m_db = std::make_shared<SQLite::Database>(m_data_home_dir / "data.db",
+	    SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE);
+
+	SQLite::Statement(*m_db, R"(
+		CREATE TABLE IF NOT EXISTS ApplicationCache (
+			id INTEGER PRIMARY KEY NOT NULL,
+			type INTEGER NOT NULL,
+			desktop_entry_path TEXT NOT NULL,
+			terminal BOOL NOT NULL,
+			no_display BOOL NOT NULL,
+			path TEXT,
+			comment TEXT,
+			dbus_activatable BOOL NOT NULL
+		)
+	)")
+	    .exec();
+
+	SQLite::Statement(*m_db, R"(
+		CREATE TABLE IF NOT EXISTS ApplicationActionCache (
+			id INTEGER PRIMARY KEY NOT NULL,
+			id_app INTEGER NOT NULL,
+			name TEXT NOT NULL,
+			exec TEXT,
+			icon TEXT,
+			FOREIGN KEY (id_app) REFERENCES ApplicationCache(id)
+		)
+	)")
+	    .exec();
+
+	m_cache.emplace(m_db);
 }
 
 App::~App()
@@ -65,6 +217,9 @@ App::~App()
 	if (m_sfd != -1)
 		close(m_sfd);
 
+	for (auto &[_, tex] : m_textures)
+		UnloadTexture(tex);
+
 	destroy_layer_surface();
 
 	if (m_gl.edpy != EGL_NO_DISPLAY) {
@@ -79,6 +234,14 @@ App::~App()
 		xkb_keymap_unref(m_kbd.xkb_keymap_v);
 	if (m_kbd.xkb_ctx_v)
 		xkb_context_unref(m_kbd.xkb_ctx_v);
+	if (m_wayland.text_input) {
+		zwp_text_input_v3_destroy(m_wayland.text_input);
+		m_wayland.text_input = nullptr;
+	}
+	if (m_wayland.text_input_mgr) {
+		zwp_text_input_manager_v3_destroy(m_wayland.text_input_mgr);
+		m_wayland.text_input_mgr = nullptr;
+	}
 	if (m_wayland.kbd)
 		wl_keyboard_destroy(m_wayland.kbd);
 	if (m_wayland.seat)
@@ -101,7 +264,10 @@ auto App::run() -> void
 	SetWindowSize(m_win_w, m_win_h);
 	while (m_running) {
 		pump_events();
+		m_ir.color(m_accent_color);
 		tick();
+		m_kbd.typing.clear();
+		m_kbd.clear_transients();
 		std::this_thread::sleep_for(std::chrono::milliseconds(16));
 	}
 }
@@ -132,9 +298,9 @@ auto App::init_wayland() -> void
 
 	static wl_keyboard_listener keyboard_listener {};
 	{
-		auto kb_keymap = [](void *data, wl_keyboard *, u32 format, i32 fd,
+		auto kb_keymap { [](void *data, wl_keyboard *, u32 format, i32 fd,
 			                 u32 size) -> void {
-			auto *app = static_cast<App *>(data);
+			auto *app { static_cast<App *>(data) };
 			if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
 				close(fd);
 				return;
@@ -158,21 +324,25 @@ auto App::init_wayland() -> void
 			    : nullptr;
 			munmap(map, size);
 			close(fd);
-		};
+		} };
 
-		auto kb_enter = [](void *, wl_keyboard *, u32, wl_surface *,
-		                    wl_array *) -> void { };
+		auto kb_enter { [](void *data, wl_keyboard *, u32 serial, wl_surface *,
+			                wl_array *) -> void {
+			static_cast<App *>(data)->m_last_serial = serial;
+		} };
 		auto kb_leave
 		    = [](void *data, wl_keyboard *, u32, wl_surface *) -> void {
 			static_cast<App *>(data)->m_kbd.held.clear();
 		};
 
-		auto kb_key = [](void *data, wl_keyboard *, u32, u32, u32 key,
+		auto kb_key { [](void *data, wl_keyboard *, u32 serial, u32, u32 key,
 			              u32 state) -> void {
-			auto *app = static_cast<App *>(data);
+			auto *app { static_cast<App *>(data) };
 			if (!app->m_kbd.xkb_state_v)
 				return;
 
+			app->m_last_serial = serial;
+
 			xkb_keycode_t kc = key + 8;
 
 			if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
@@ -186,7 +356,68 @@ auto App::init_wayland() -> void
 				bool ctrl = app->m_kbd.mod_active("Control");
 				bool alt = app->m_kbd.mod_active("Mod1");
 				bool meta = app->m_kbd.mod_active("Mod4");
-				if (!(ctrl || alt || meta)) {
+
+				bool handled = false;
+				switch (sym) {
+				case XKB_KEY_Left:
+					app->m_kbd.typing.push_back(1);
+					handled = true;
+					break;
+				case XKB_KEY_Down:
+					app->m_kbd.typing.push_back(2);
+					handled = true;
+					break;
+				case XKB_KEY_Up:
+					app->m_kbd.typing.push_back(3);
+					handled = true;
+					break;
+				case XKB_KEY_Right:
+					app->m_kbd.typing.push_back(4);
+					handled = true;
+					break;
+				case XKB_KEY_BackSpace:
+					app->m_kbd.typing.push_back(8);
+					handled = true;
+					break;
+				case XKB_KEY_Delete:
+				case XKB_KEY_KP_Delete:
+					app->m_kbd.typing.push_back(0x7F);
+					handled = true;
+					break;
+				case XKB_KEY_Return:
+				case XKB_KEY_KP_Enter:
+					app->m_kbd.typing.push_back('\n');
+					handled = true;
+					break;
+				case XKB_KEY_v:
+				case XKB_KEY_V:
+					app->m_kbd.typing.push_back('v');
+					handled = true;
+					break;
+				case XKB_KEY_c:
+				case XKB_KEY_C:
+					app->m_kbd.typing.push_back('c');
+					handled = true;
+					break;
+				case XKB_KEY_w:
+				case XKB_KEY_W:
+					if (ctrl) {
+						app->m_kbd.typing.push_back(8);
+						handled = true;
+					}
+					break;
+				case XKB_KEY_a:
+				case XKB_KEY_A:
+					if (ctrl) {
+						app->m_kbd.typing.push_back('a');
+						handled = true;
+					}
+					break;
+				default:
+					break;
+				}
+
+				if (!handled && !(ctrl || alt || meta)) {
 					u32 cp = xkb_keysym_to_utf32(sym);
 					if (cp >= 0x20) {
 						char buf[8];
@@ -203,27 +434,117 @@ auto App::init_wayland() -> void
 				app->m_kbd.held.erase(key);
 				xkb_state_update_key(app->m_kbd.xkb_state_v, kc, XKB_KEY_UP);
 			}
-		};
+		} };
 
-		auto kb_mods = [](void *data, wl_keyboard *, u32, u32 depressed,
+		auto kb_mods { [](void *data, wl_keyboard *, u32, u32 depressed,
 			               u32 latched, u32 locked, u32 group) -> void {
-			auto *app = static_cast<App *>(data);
+			auto *app { static_cast<App *>(data) };
 			if (!app->m_kbd.xkb_state_v)
 				return;
 			xkb_state_update_mask(app->m_kbd.xkb_state_v, depressed, latched,
 			    locked, 0, 0, group);
-		};
+		} };
 
-		auto kb_repeat_info = [](void *, wl_keyboard *, i32, i32) -> void { };
+		auto kb_repeat_info { [](void *, wl_keyboard *, i32, i32) -> void { } };
 
 		keyboard_listener = { kb_keymap, kb_enter, kb_leave, kb_key, kb_mods,
 			kb_repeat_info };
 	}
 
+	static zwp_text_input_v3_listener text_input_listener {};
+	{
+		auto ti_enter =
+		    [](void *data, zwp_text_input_v3 *,
+		        wl_surface *surface) // cppcheck-suppress constParameterPointer
+		    -> void {
+			auto *app { static_cast<App *>(data) };
+			bool const focused_surface
+			    = surface && surface == app->m_wayland.surface;
+			app->m_ime.seat_focus = focused_surface;
+			app->m_ime.pending = {};
+			app->m_ime.pending_done = false;
+			if (!focused_surface) {
+				app->m_ime.enabled = false;
+				app->m_ime.last_surrounding.clear();
+				if (app->m_gui)
+					app->m_gui->ime_clear_preedit();
+			} else {
+				app->m_ime.surrounding_dirty = true;
+			}
+		};
+
+		auto ti_leave { [](void *data, zwp_text_input_v3 *,
+			                wl_surface *) -> void {
+			auto *app { static_cast<App *>(data) };
+			app->m_ime.seat_focus = false;
+			app->m_ime.enabled = false;
+			app->m_ime.pending = {};
+			app->m_ime.pending_done = false;
+			app->m_ime.last_surrounding.clear();
+			if (app->m_gui)
+				app->m_gui->ime_clear_preedit();
+		} };
+
+		auto ti_preedit { [](void *data, zwp_text_input_v3 *, char const *text,
+			                  int32_t cursor_begin,
+			                  int32_t cursor_end) -> void {
+			auto *app { static_cast<App *>(data) };
+			auto &pending { app->m_ime.pending };
+			pending.has_preedit = true;
+			pending.preedit_text = text ? text : "";
+			pending.cursor_begin = cursor_begin;
+			pending.cursor_end = cursor_end;
+		} };
+
+		auto ti_commit { [](void *data, zwp_text_input_v3 *,
+			                 char const *text) -> void {
+			auto *app { static_cast<App *>(data) };
+			auto &pending { app->m_ime.pending };
+			pending.has_commit = true;
+			pending.commit_text = text ? text : "";
+		} };
+
+		auto ti_delete { [](void *data, zwp_text_input_v3 *, uint32_t before,
+			                 uint32_t after) -> void {
+			auto *app { static_cast<App *>(data) };
+			auto &pending { app->m_ime.pending };
+			pending.has_delete = true;
+			pending.before = before;
+			pending.after = after;
+		} };
+
+		auto ti_done
+		    = [](void *data, zwp_text_input_v3 *, uint32_t serial) -> void {
+			auto *app { static_cast<App *>(data) };
+			app->m_ime.pending_done = true;
+			app->m_ime.pending_serial = serial;
+			app->m_ime.surrounding_dirty = true;
+		};
+
+		text_input_listener
+		    = { ti_enter, ti_leave, ti_preedit, ti_commit, ti_delete, ti_done };
+	}
+
+	static auto ensure_text_input { +[](App *app) -> void {
+		if (!app->m_wayland.text_input_mgr || !app->m_wayland.seat
+		    || app->m_wayland.text_input)
+			return;
+		app->m_wayland.text_input = zwp_text_input_manager_v3_get_text_input(
+		    app->m_wayland.text_input_mgr, app->m_wayland.seat);
+		if (!app->m_wayland.text_input)
+			return;
+		zwp_text_input_v3_add_listener(
+		    app->m_wayland.text_input, &text_input_listener, app);
+		app->m_ime.supported = true;
+		app->m_ime.enabled = false;
+		app->m_ime.last_surrounding.clear();
+		app->m_ime.sent_serial = 0;
+	} };
+
 	auto handle_registry_global
 	    = [](void *data, wl_registry *registry, u32 name, char const *interface,
 	          u32 version) -> void {
-		auto *app = static_cast<App *>(data);
+		auto *app { static_cast<App *>(data) };
 		if (std::strcmp(interface, wl_compositor_interface.name) == 0) {
 			app->m_wayland.compositor = static_cast<wl_compositor *>(
 			    wl_registry_bind(registry, name, &wl_compositor_interface, 4));
@@ -233,12 +554,14 @@ auto App::init_wayland() -> void
 			static struct wl_seat_listener const seat_listener = {
 				.capabilities =
 				    [](void *data, struct wl_seat *seat, u32 caps) {
-				        auto *app = static_cast<App *>(data);
+				        auto *app { static_cast<App *>(data) };
 				        if (caps & WL_SEAT_CAPABILITY_KEYBOARD) {
 					        app->m_wayland.kbd = wl_seat_get_keyboard(seat);
 					        wl_keyboard_add_listener(
 					            app->m_wayland.kbd, &keyboard_listener, data);
+					        app->m_ime.seat_focus = false;
 				        }
+				        ensure_text_input(app);
 				    },
 				.name = [](void *, struct wl_seat *, char const *) {},
 			};
@@ -259,6 +582,120 @@ auto App::init_wayland() -> void
 			app->m_wayland.kde_blur_mgr
 			    = static_cast<org_kde_kwin_blur_manager *>(wl_registry_bind(
 			        registry, name, &org_kde_kwin_blur_manager_interface, 1));
+		} else if (std::strcmp(
+		               interface, zwp_text_input_manager_v3_interface.name)
+		    == 0) {
+			app->m_wayland.text_input_mgr
+			    = static_cast<zwp_text_input_manager_v3 *>(wl_registry_bind(
+			        registry, name, &zwp_text_input_manager_v3_interface, 1));
+			app->m_ime.supported = true;
+			ensure_text_input(app);
+		} else if (std::strcmp(interface, wl_data_device_manager_interface.name)
+		    == 0) {
+			app->m_wayland.ddm
+			    = static_cast<wl_data_device_manager *>(wl_registry_bind(
+			        registry, name, &wl_data_device_manager_interface,
+			        std::min<uint32_t>(version, 3)));
+			if (app->m_wayland.ddm && !app->m_wayland.ddev) {
+				app->m_wayland.ddev = wl_data_device_manager_get_data_device(
+				    app->m_wayland.ddm, app->m_wayland.seat);
+				static wl_data_device_listener const ddev_l = {
+					.data_offer =
+					    [](void *data, wl_data_device *, wl_data_offer *offer) {
+					        auto *app = static_cast<App *>(data);
+					        static wl_data_offer_listener const offer_l = {
+						        .offer =
+						            [](void *data, wl_data_offer *,
+						                char const *mime) {
+						                auto *app = static_cast<App *>(data);
+						                (void)app;
+						                (void)mime;
+						            },
+#if WL_DATA_OFFER_SOURCE_ACTIONS_SINCE_VERSION
+						        .source_actions
+						        = [](void *, wl_data_offer *, uint32_t) {},
+						        .action
+						        = [](void *, wl_data_offer *, uint32_t) {}
+#endif
+					        };
+					        wl_data_offer_add_listener(offer, &offer_l, app);
+					        if (app->m_wayland.curr_offer
+					            && app->m_wayland.curr_offer != offer)
+						        wl_data_offer_destroy(
+						            app->m_wayland.curr_offer);
+					        app->m_wayland.curr_offer = offer;
+					    },
+					.enter
+					= [](void *, wl_data_device *, uint32_t, wl_surface *,
+					      wl_fixed_t, wl_fixed_t, wl_data_offer *) {},
+					.leave = [](void *, wl_data_device *) {},
+					.motion = [](void *, wl_data_device *, uint32_t, wl_fixed_t,
+					              wl_fixed_t) {},
+					.drop = [](void *, wl_data_device *) {},
+					.selection =
+					    [](void *data, wl_data_device *, wl_data_offer *offer) {
+					        auto *app = static_cast<App *>(data);
+					        if (!offer) {
+						        app->m_clipboard_cache.clear();
+						        return;
+					        }
+
+					        char const *mime = "text/plain;charset=utf-8";
+					        int fds[2];
+					        if (pipe(fds) != 0)
+						        return;
+
+					        wl_data_offer_receive(offer, mime, fds[1]);
+					        wl_display_flush(app->m_wayland.display);
+					        close(fds[1]);
+
+					        int rfd = fds[0];
+
+					        std::thread([app, rfd, offer]() {
+						        std::string data;
+						        char buf[4096];
+						        for (;;) {
+							        ssize_t n = read(rfd, buf, sizeof buf);
+							        if (n > 0) {
+								        data.append(buf, buf + n);
+								        continue;
+							        }
+							        if (n < 0 && errno == EINTR)
+								        continue;
+							        break;
+						        }
+						        close(rfd);
+
+						        struct Ctx {
+							        App *app;
+							        wl_data_offer *offer;
+							        std::string data;
+						        };
+						        auto *ctx
+						            = new Ctx { app, offer, std::move(data) };
+
+						        g_main_context_invoke(
+						            nullptr,
+						            +[](gpointer p) -> gboolean {
+							            auto *ctx = static_cast<Ctx *>(p);
+							            if (!ctx->data.empty())
+								            ctx->app->m_clipboard_cache
+								                = std::move(ctx->data);
+							            if (ctx->offer
+							                == ctx->app->m_wayland.curr_offer) {
+								            wl_data_offer_destroy(ctx->offer);
+								            ctx->app->m_wayland.curr_offer
+								                = nullptr;
+							            }
+							            delete ctx;
+							            return G_SOURCE_REMOVE;
+						            },
+						            ctx);
+					        }).detach();
+					    },
+				};
+				wl_data_device_add_listener(app->m_wayland.ddev, &ddev_l, app);
+			}
 		}
 	};
 
@@ -295,14 +732,54 @@ auto App::init_egl() -> void
 
 	ensure_egl_surface();
 
+	{
+		auto const *env = getenv("WAYLIGHT_DEBUG");
+		if (env && *env) {
+			SetTraceLogLevel(LOG_DEBUG);
+		}
+	}
+
 	InitWindow(m_win_w, m_win_h, "");
 
-	m_tr = TextRenderer();
-	auto const font = find_font_path();
+	m_tr = std::make_shared<TextRenderer>();
+	m_gui = std::make_shared<ImGui>(m_tr);
+	auto const font { find_font_path() };
 	assert(font && "Could not find font");
-	auto const font_handle = m_tr->load_font(*font);
+	std::vector<std::filesystem::path> fallback_paths;
+	std::unordered_set<std::string> seen_paths;
+	auto const primary_path_str { font->string() };
+
+	constexpr char const *fallback_candidates[] = {
+		"Noto Sans CJK JP:style=Regular",
+		"Noto Sans CJK SC:style=Regular",
+		"Noto Sans CJK KR:style=Regular",
+		"Noto Sans CJK TC:style=Regular",
+		"sans-serif:lang=ja",
+		"sans-serif:lang=ko",
+		"sans-serif:lang=zh-cn",
+		"sans-serif:lang=zh-tw",
+		"sans-serif:lang=zh-hk",
+		"Noto Color Emoji:style=Regular",
+	};
+	for (auto const *name : fallback_candidates) {
+		if (auto fallback { find_font_path(name) }) {
+			auto const path_str { fallback->string() };
+			if (path_str == primary_path_str)
+				continue;
+			if (!seen_paths.emplace(path_str).second)
+				continue;
+			fallback_paths.push_back(*fallback);
+		}
+	}
+	if (fallback_paths.empty()) {
+		TraceLog(LOG_WARNING,
+		    "No fallback fonts found; some glyphs may render as missing");
+	}
+	auto const font_handle { m_tr->load_font(
+		*font, std::span(fallback_paths)) };
 	assert(font_handle && "Could not load font");
 	m_font = *font_handle;
+	m_gui->set_font(m_font);
 }
 
 auto App::init_signal() -> void
@@ -326,9 +803,9 @@ auto App::init_signal() -> void
 void App::on_settings_changed(XdpSettings * /*self*/, char const *ns,
     char const *key, GVariant * /*value*/, gpointer data)
 {
-	auto *app = static_cast<App *>(data);
-	if (g_strcmp0(ns, "org.freedesktop.appearance") == 0
-	    && g_strcmp0(key, "color-scheme") == 0) {
+	auto *app { static_cast<App *>(data) };
+	if (g_strcmp0(ns, "org.freedesktop.appearance") == 0) {
+		if (g_strcmp0(key, "color-scheme") == 0) {
 			guint v = xdp_settings_read_uint(app->m_xdp.settings,
 			    "org.freedesktop.appearance", "color-scheme", NULL, NULL);
 
@@ -336,6 +813,18 @@ void App::on_settings_changed(XdpSettings * /*self*/, char const *ns,
 				app->m_active_theme = Theme::Dark;
 			else
 				app->m_active_theme = Theme::Light;
+		} else if (g_strcmp0(key, "accent-color") == 0) {
+			auto val { xdp_settings_read_value(app->m_xdp.settings,
+				"org.freedesktop.appearance", "accent-color", NULL, NULL) };
+			if (val) {
+				gdouble r, g, b;
+				g_variant_get(val, "(ddd)", &r, &g, &b);
+				app->m_accent_color.r = static_cast<u8>(r * 255);
+				app->m_accent_color.g = static_cast<u8>(g * 255);
+				app->m_accent_color.b = static_cast<u8>(b * 255);
+				g_variant_unref(val);
+			}
+		}
 	}
 }
 
@@ -351,6 +840,17 @@ auto App::init_theme_portal() -> void
 	else
 		m_active_theme = Theme::Light;
 
+	auto val { xdp_settings_read_value(m_xdp.settings,
+		"org.freedesktop.appearance", "accent-color", NULL, NULL) };
+	if (val) {
+		gdouble r, g, b;
+		g_variant_get(val, "(ddd)", &r, &g, &b);
+		m_accent_color.r = static_cast<u8>(r * 255);
+		m_accent_color.g = static_cast<u8>(g * 255);
+		m_accent_color.b = static_cast<u8>(b * 255);
+		g_variant_unref(val);
+	}
+
 	g_signal_connect(
 	    m_xdp.settings, "changed", G_CALLBACK(on_settings_changed), this);
 }
@@ -404,9 +904,9 @@ auto App::create_layer_surface() -> void
 		    ZWLR_LAYER_SURFACE_V1_KEYBOARD_INTERACTIVITY_ON_DEMAND);
 	}
 
-	auto handle_layer_configure = [](void *data, zwlr_layer_surface_v1 *ls,
+	auto handle_layer_configure { [](void *data, zwlr_layer_surface_v1 *ls,
 		                              u32 serial, u32 w, u32 h) -> void {
-		auto *app = static_cast<App *>(data);
+		auto *app { static_cast<App *>(data) };
 		if (w)
 			app->m_win_w = static_cast<int>(w);
 		if (h)
@@ -429,11 +929,11 @@ auto App::create_layer_surface() -> void
 
 		if (app->m_wayland.surface)
 			wl_surface_commit(app->m_wayland.surface);
-	};
+	} };
 
-	auto handle_layer_closed = [](void *data, zwlr_layer_surface_v1 *) -> void {
+	auto handle_layer_closed { [](void *data, zwlr_layer_surface_v1 *) -> void {
 		static_cast<App *>(data)->m_running = false;
-	};
+	} };
 
 	static zwlr_layer_surface_v1_listener const lsl = {
 		.configure = handle_layer_configure,
@@ -541,6 +1041,127 @@ auto App::update_blur_region() -> void
 	wl_region_destroy(region);
 }
 
+auto App::process_pending_text_input() -> void
+{
+	if (!m_ime.pending_done)
+		return;
+	if (!m_gui)
+		return;
+	if (!m_ime.bound_text)
+		return;
+	if (!m_wayland.text_input)
+		return;
+
+	auto focused { m_gui->focused_text_input() };
+	if (!focused || *focused != m_ime.bound_id) {
+		m_ime.pending = {};
+		m_ime.pending_done = false;
+		return;
+	}
+
+	m_gui->ime_clear_preedit();
+
+	if (m_ime.pending.has_delete) {
+		m_gui->ime_delete_surrounding(
+		    *m_ime.bound_text, m_ime.pending.before, m_ime.pending.after);
+	}
+
+	if (m_ime.pending.has_commit) {
+		m_gui->ime_commit_text(*m_ime.bound_text, m_ime.pending.commit_text);
+	}
+
+	if (m_ime.pending.has_preedit) {
+		m_gui->ime_set_preedit(m_ime.pending.preedit_text,
+		    m_ime.pending.cursor_begin, m_ime.pending.cursor_end);
+	} else {
+		m_gui->ime_clear_preedit();
+	}
+
+	m_ime.pending = {};
+	m_ime.pending_done = false;
+	m_ime.surrounding_dirty = true;
+}
+
+auto App::update_text_input_state(
+    std::pmr::string const &text, usize id, Rectangle field_rect) -> void
+{
+	if (!m_wayland.text_input || !m_ime.supported || !m_gui)
+		return;
+
+	m_ime.bound_rect = field_rect;
+
+	auto focused { m_gui->focused_text_input() };
+	bool const has_focus { focused && (*focused == id) };
+	bool const should_enable { has_focus && m_ime.seat_focus };
+
+	if (!should_enable) {
+		if (m_ime.enabled) {
+			zwp_text_input_v3_disable(m_wayland.text_input);
+			zwp_text_input_v3_commit(m_wayland.text_input);
+			m_ime.sent_serial++;
+			m_ime.enabled = false;
+			m_ime.last_surrounding.clear();
+		}
+		return;
+	}
+
+	bool state_dirty = false;
+
+	if (!m_ime.enabled) {
+		zwp_text_input_v3_enable(m_wayland.text_input);
+		zwp_text_input_v3_set_content_type(m_wayland.text_input,
+		    ZWP_TEXT_INPUT_V3_CONTENT_HINT_NONE,
+		    ZWP_TEXT_INPUT_V3_CONTENT_PURPOSE_NORMAL);
+		m_ime.enabled = true;
+		m_ime.surrounding_dirty = true;
+		state_dirty = true;
+	}
+
+	if (auto info { m_gui->text_input_surrounding(id, text) }) {
+		auto slice
+		    = clamp_surrounding_text(info->text, info->cursor, info->anchor);
+		if (m_ime.surrounding_dirty || slice.text != m_ime.last_surrounding
+		    || slice.cursor != m_ime.last_cursor
+		    || slice.anchor != m_ime.last_anchor) {
+			zwp_text_input_v3_set_surrounding_text(m_wayland.text_input,
+			    slice.text.c_str(), slice.cursor, slice.anchor);
+			m_ime.last_surrounding = std::move(slice.text);
+			m_ime.last_cursor = slice.cursor;
+			m_ime.last_anchor = slice.anchor;
+			state_dirty = true;
+		}
+	}
+
+	if (auto cursor_info { m_gui->text_input_cursor(id) }) {
+		Rectangle rect = cursor_info->rect;
+		int32_t const x = static_cast<int32_t>(std::round(rect.x));
+		int32_t const y = static_cast<int32_t>(std::round(rect.y));
+		int32_t const width
+		    = std::max(1, static_cast<int32_t>(std::round(rect.width)));
+		int32_t const height
+		    = std::max(1, static_cast<int32_t>(std::round(rect.height)));
+		bool const cur_visible = cursor_info->visible;
+
+		if (rect.x != m_ime.last_cursor_rect.x
+		    || rect.y != m_ime.last_cursor_rect.y
+		    || rect.width != m_ime.last_cursor_rect.width
+		    || rect.height != m_ime.last_cursor_rect.height
+		    || cur_visible != m_ime.last_cursor_visible) {
+			zwp_text_input_v3_set_cursor_rectangle(
+			    m_wayland.text_input, x, y, width, height);
+			m_ime.last_cursor_rect = rect;
+			m_ime.last_cursor_visible = cur_visible;
+			state_dirty = true;
+		}
+	}
+
+	if (state_dirty) {
+		zwp_text_input_v3_commit(m_wayland.text_input);
+		m_ime.sent_serial++;
+		m_ime.surrounding_dirty = false;
+	}
+}
+
 auto App::pump_events() -> void
 {
 	while (g_main_context_iteration(nullptr, false))
@@ -552,13 +1173,13 @@ auto App::pump_events() -> void
 	pollfd fds[2] { { wl_display_get_fd(m_wayland.display), POLLIN, 0 },
 		{ m_sfd, POLLIN, 0 } };
 
-	auto prepared = (wl_display_prepare_read(m_wayland.display) == 0);
-	auto ret = poll(fds, 2, 0);
+	auto prepared { (wl_display_prepare_read(m_wayland.display) == 0) };
+	auto ret { poll(fds, 2, 0) };
 
 	if (ret > 0 && (fds[0].revents & POLLIN)) {
 		if (prepared) {
 			wl_display_read_events(m_wayland.display);
-			prepared = false;
+			prepared = false; // cppcheck-suppress unreadVariable
 		}
 	} else if (prepared) {
 		wl_display_cancel_read(m_wayland.display);
@@ -573,3 +1194,135 @@ auto App::pump_events() -> void
 		}
 	}
 }
+
+auto App::clipboard(std::string_view const &str) -> void
+{
+	if (!m_wayland.ddm || !m_wayland.ddev || !m_wayland.seat)
+		return;
+	if (m_last_serial == 0)
+		return;
+
+	if (m_wayland.curr_source) {
+		wl_data_source_destroy(m_wayland.curr_source);
+		m_wayland.curr_source = nullptr;
+	}
+	m_wayland.curr_source
+	    = wl_data_device_manager_create_data_source(m_wayland.ddm);
+
+	static wl_data_source_listener const src_l = {
+		.target = [](void *, wl_data_source *, char const *) {},
+		.send =
+		    [](void *data, wl_data_source *, char const *, int32_t fd) {
+		        auto *app = static_cast<App *>(data);
+
+		        int wfd = dup(fd);
+		        close(fd);
+
+		        std::pmr::string payload = app->m_clipboard_cache;
+		        std::thread([wfd, payload = std::move(payload)]() {
+			        size_t off = 0;
+			        while (off < payload.size()) {
+				        ssize_t n = write(wfd, payload.data() + off,
+				            std::min<size_t>(64 * 1024, payload.size() - off));
+				        if (n > 0) {
+					        off += (size_t)n;
+					        continue;
+				        }
+				        if (n < 0 && (errno == EINTR))
+					        continue;
+				        if (n < 0 && (errno == EAGAIN)) {
+					        std::this_thread::sleep_for(
+					            std::chrono::milliseconds(1));
+					        continue;
+				        }
+				        break;
+			        }
+			        close(wfd);
+		        }).detach();
+		    },
+		.cancelled =
+		    [](void *data, wl_data_source *src) {
+		        auto *app = static_cast<App *>(data);
+		        if (app->m_wayland.curr_source == src)
+			        app->m_wayland.curr_source = nullptr;
+		        wl_data_source_destroy(src);
+		    },
+#if WL_DATA_SOURCE_DND_DROP_PERFORMED_SINCE_VERSION
+		.dnd_drop_performed = [](void *, wl_data_source *) {},
+		.dnd_finished = [](void *, wl_data_source *) {},
+		.action = [](void *, wl_data_source *, uint32_t) {}
+#endif
+	};
+	wl_data_source_add_listener(m_wayland.curr_source, &src_l, this);
+	wl_data_source_offer(m_wayland.curr_source, "text/plain;charset=utf-8");
+	wl_data_source_offer(m_wayland.curr_source, "text/plain");
+
+	m_clipboard_cache.assign(str.begin(), str.end());
+
+	wl_data_device_set_selection(
+	    m_wayland.ddev, m_wayland.curr_source, m_last_serial);
+	wl_display_flush(m_wayland.display);
+}
+
+void App::execute_command(bool terminal, std::string_view const command)
+{
+	constexpr auto resolve_cmdline { [](std::string_view const cmdline,
+		                                 std::vector<std::string> &out) {
+		std::ranges::copy(cmdline | std::views::split(' ')
+		        | std::views::transform(
+		            [](auto &&s) { return std::string(s.begin(), s.end()); }),
+		    std::back_inserter(out));
+	} };
+
+	std::vector<std::string> args;
+	if (terminal) {
+		resolve_cmdline(m_config.terminal_cmdline, args);
+	} else {
+		args.push_back("/bin/sh");
+		args.push_back("-c");
+	}
+
+	args.push_back(std::string(command));
+	if (auto const &exe { args.at(0) }; exe.at(0) != '/') {
+		auto const *path_env { getenv("PATH") };
+		if (!(path_env && *path_env)) {
+			path_env = "/bin";
+		}
+		auto const path { std::string(path_env) };
+
+		for (auto const &dir :
+		    path | std::views::split(':') | std::views::transform([](auto &&s) {
+			    return std::filesystem::path(s.begin(), s.end());
+		    }) | std::views::filter([](auto &&p) {
+			    return std::filesystem::is_directory(p);
+		    })) {
+			auto const path = dir / exe;
+			if (std::filesystem::is_regular_file(path)) {
+				args[0] = path.string();
+			}
+		}
+	}
+
+	std::print("Final args: ");
+	for (auto const &arg : args) {
+		std::print("{} ", arg);
+	}
+	std::println("");
+
+	std::vector<char const *> cargs;
+	std::transform(args.begin(), args.end(), std::back_inserter(cargs),
+	    [](auto &&s) { return s.c_str(); });
+	cargs.push_back(nullptr);
+	auto cargsc { const_cast<char *const *>(cargs.data()) };
+
+	auto const pid = fork();
+	if (pid == 0) {
+		setsid();
+
+		execv(args.at(0).c_str(), cargsc);
+	} else if (pid < 0) {
+		throw std::runtime_error("Failed to fork process");
+	}
+}
+
+} // namespace Waylight

src/App.hpp

@@ -1,26 +1,38 @@
 #pragma once
 
+#include <cassert>
+#include <filesystem>
+#include <string>
 #include <unordered_set>
 #include <vector>
 
 #include <EGL/egl.h>
 #include <libportal/portal.h>
+#include <wayland-client-protocol.h>
 extern "C" {
 #include "blur-client-protocol.h"
 #define namespace namespace_
 #include "ext-background-effect-v1-client-protocol.h"
+#include "text-input-unstable-v3-client-protocol.h"
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
 #include <libportal/settings.h>
 #undef namespace
 }
+#include <SQLiteCpp/SQLiteCpp.h>
 #include <wayland-client.h>
 #include <wayland-egl.h>
 #include <xkbcommon/xkbcommon.h>
 
+#include "Cache.hpp"
+#include "Config.hpp"
+#include "IconRegistry.hpp"
+#include "ImGui.hpp"
 #include "TextRenderer.hpp"
 #include "Theme.hpp"
 #include "common.hpp"
 
+namespace Waylight {
+
 struct TypingBuffer : std::pmr::vector<u32> {
 	void push_utf8(char const *s);
 };
@@ -46,11 +58,20 @@ private:
 	auto destroy_layer_surface() -> void;
 	auto ensure_egl_surface() -> void;
 	auto update_blur_region() -> void;
+	auto process_pending_text_input() -> void;
+	auto update_text_input_state(
+	    std::pmr::string const &text, usize id, Rectangle field_rect) -> void;
 	auto theme() const -> ColorScheme const &
 	{
 		return m_themes[m_active_theme];
 	}
 
+	auto clipboard() const -> std::pmr::string const &
+	{
+		return m_clipboard_cache;
+	}
+	auto clipboard(std::string_view const &str) -> void;
+
 	static void on_settings_changed(XdpSettings * /*self*/, char const *ns,
 	    char const *key, GVariant * /*value*/, gpointer data);
 
@@ -67,7 +88,15 @@ private:
 		ext_background_effect_surface_v1 *eff {};
 		org_kde_kwin_blur_manager *kde_blur_mgr {};
 		org_kde_kwin_blur *kde_blur {};
+		zwp_text_input_manager_v3 *text_input_mgr {};
+		zwp_text_input_v3 *text_input {};
+		wl_data_device_manager *ddm {};
+		wl_data_device *ddev {};
+		wl_data_offer *curr_offer {};
+		wl_data_source *curr_source {};
 	} m_wayland;
+	std::pmr::string m_clipboard_cache;
+	u32 m_last_serial { 0 };
 
 	struct {
 		EGLDisplay edpy { EGL_NO_DISPLAY };
@@ -102,13 +131,11 @@ private:
 		{
 			if (!xkb_state_v)
 				return false;
-			for (auto k : held) {
-				if (xkb_state_key_get_one_sym(
+			return std::any_of(held.begin(), held.end(), [&](u32 const k) {
+				return (xkb_state_key_get_one_sym(
 				            xkb_state_v, static_cast<xkb_keycode_t>(k + 8))
-				    == sym)
-					return true;
-			}
-			return false;
+				    == sym);
+			});
 		}
 
 		auto is_sym_pressed(xkb_keysym_t sym) const -> bool
@@ -139,16 +166,78 @@ private:
 		}
 	} m_kbd;
 
-	std::optional<TextRenderer> m_tr { std::nullopt };
+	std::shared_ptr<TextRenderer> m_tr { nullptr };
 	FontHandle m_font;
+	std::shared_ptr<ImGui> m_gui { nullptr };
+
+	struct {
+		bool supported { false };
+		bool seat_focus { false };
+		bool enabled { false };
+		bool pending_done { false };
+		uint32_t pending_serial { 0 };
+		uint32_t sent_serial { 0 };
+
+		std::pmr::string *bound_text { nullptr };
+		usize bound_id { 0 };
+		Rectangle bound_rect {};
+
+		struct {
+			bool has_preedit { false };
+			std::string preedit_text;
+			int cursor_begin { 0 };
+			int cursor_end { 0 };
+			bool has_commit { false };
+			std::string commit_text;
+			bool has_delete { false };
+			uint32_t before { 0 };
+			uint32_t after { 0 };
+		} pending;
+
+		std::string last_surrounding;
+		int last_cursor { 0 };
+		int last_anchor { 0 };
+		Rectangle last_cursor_rect {};
+		bool last_cursor_visible { false };
+		bool surrounding_dirty { false };
+	} m_ime;
+
+	auto get_texture(std::filesystem::path const &path) -> Texture2D const &
+	{
+		if (m_textures.contains(path)) {
+			return m_textures[path];
+		}
+		auto fname = path.c_str();
+		assert(fname);
+		TraceLog(LOG_INFO, std::format("loading texture at {}", fname).c_str());
+		auto const tex = LoadTexture(fname);
+		assert(IsTextureValid(tex));
+		m_textures[path] = tex;
+		return m_textures[path];
+	}
+
+	void execute_command(bool terminal, std::string_view const command);
+
+	// NOTE: Canonicalize first!
+	std::unordered_map<std::filesystem::path, Texture2D> m_textures;
 
 	enum_array<Theme, ColorScheme> m_themes { make_default_themes() };
 	Theme m_active_theme { Theme::Light };
+	IconRegistry m_ir;
+	std::optional<Cache> m_cache;
+	Config m_config;
 
 	int m_win_w { 800 };
 	int m_win_h { 600 };
 	bool m_running { true };
 	bool m_visible { true };
 
+	Color m_accent_color { 127, 127, 255, 255 };
+
+	std::filesystem::path m_data_home_dir {};
+	std::filesystem::path m_config_home_dir {};
+	std::shared_ptr<SQLite::Database> m_db {};
 	int m_sfd { -1 };
 };
+
+} // namespace Waylight

src/Cache.cpp

@@ -0,0 +1,435 @@
+#include "Cache.hpp"
+
+#include <algorithm>
+#include <numeric>
+#include <ranges>
+#include <unordered_map>
+
+#include <SQLiteCpp/Statement.h>
+#include <SQLiteCpp/Transaction.h>
+#include <mini/ini.h>
+#include <raylib.h>
+
+#include "common.hpp"
+#include <sys/inotify.h>
+
+namespace Waylight {
+
+void replace_all(
+    std::string &str, std::string const &from, std::string const &to)
+{
+	if (from.empty())
+		return;
+	size_t pos = 0;
+	while ((pos = str.find(from, pos)) != std::string::npos) {
+		str.replace(pos, from.size(), to);
+		pos += to.size();
+	}
+}
+
+Cache::Cache(std::shared_ptr<SQLite::Database> db)
+    : m_db(db)
+{
+	{
+		auto const *env { getenv("XDG_DATA_DIRS") };
+		if (env && *env) {
+			std::ranges::copy(std::string_view(env) | std::views::split(':')
+			        | std::views::transform([](auto &&s) {
+				          return std::filesystem::path(s.begin(), s.end())
+				              / "applications";
+			          })
+			        | std::views::filter([](auto &&p) {
+				          if (!std::filesystem::is_directory(p))
+					          return false;
+				          if (std::filesystem::directory_iterator(p)
+				              == std::filesystem::directory_iterator {})
+					          return false;
+				          return true;
+			          }),
+			    std::back_inserter(m_app_dirs));
+		}
+	}
+
+	load();
+
+	auto total = std::accumulate(m_app_dirs.begin(), m_app_dirs.end(),
+	    static_cast<usize>(0), [](usize acc, auto &&dir) {
+		    return acc
+		        + std::count_if(std::filesystem::directory_iterator(dir),
+		            std::filesystem::directory_iterator {}, [](auto &&entry) {
+			            return entry.is_regular_file()
+			                && entry.path().extension() == ".desktop";
+		            });
+	    });
+	if (total != m_apps.size()) {
+		rescan();
+	}
+
+	TraceLog(LOG_DEBUG, std::format("Applications in cache:").c_str());
+	for (auto const &app : m_apps) {
+		TraceLog(LOG_DEBUG,
+		    std::format("{}:", app.desktop_entry_path.string()).c_str());
+		if (app.comment)
+			TraceLog(
+			    LOG_DEBUG, std::format(" - Comment: {}", *app.comment).c_str());
+		if (app.path)
+			TraceLog(LOG_DEBUG, std::format(" - Path: {}", *app.path).c_str());
+		TraceLog(
+		    LOG_DEBUG, std::format(" - Terminal: {}", app.terminal).c_str());
+		TraceLog(
+		    LOG_DEBUG, std::format(" - NoDisplay: {}", app.no_display).c_str());
+		TraceLog(LOG_DEBUG, std::format(" - Actions:").c_str());
+		for (auto const &action : app.actions) {
+			TraceLog(
+			    LOG_DEBUG, std::format("   - Name: {}", action.name).c_str());
+			if (action.exec)
+				TraceLog(LOG_DEBUG,
+				    std::format("     Exec: {}", *action.exec).c_str());
+		}
+	}
+
+	for (auto const &dir : m_app_dirs) {
+		m_inotify.watch_path_recursively(dir);
+	}
+
+	m_inotify.set_callback([this](FileWatchEvent const &event) {
+		auto const mask = event.mask;
+		if (mask & IN_Q_OVERFLOW) {
+			rescan();
+			return;
+		}
+
+		if (mask & IN_ISDIR) {
+			rescan();
+			return;
+		}
+
+		if (mask & (IN_CREATE | IN_DELETE | IN_MODIFY | IN_MOVED_FROM
+		        | IN_MOVED_TO | IN_CLOSE_WRITE)) {
+			if (event.path.extension() == ".desktop") {
+				rescan();
+			}
+		}
+	});
+
+	m_inotify_thread = std::thread([this]() { m_inotify.run(); });
+}
+
+Cache::~Cache()
+{
+	m_inotify.stop();
+	if (m_inotify_thread.joinable())
+		m_inotify_thread.join();
+}
+
+void Cache::rescan()
+{
+	m_apps.clear();
+
+	int id = 0;
+	for (auto const &dir : m_app_dirs) {
+		for (auto const &file : std::filesystem::directory_iterator(dir)) {
+			if (!file.is_regular_file())
+				continue;
+
+			if (file.path().extension() != ".desktop")
+				continue;
+
+			mINI::INIFile ini_file(file.path());
+			mINI::INIStructure ini;
+			ini_file.read(ini);
+
+			constexpr auto read_action = [&](std::string const
+			                                     &desktop_file_uri,
+			                                 mINI::INIMap<std::string> const
+			                                     &section) {
+				auto const name = section.get("Name");
+				auto const icon = [&]()
+				    -> std::optional<
+				        std::variant<std::filesystem::path, std::string>> {
+					if (section.has("Icon")) {
+						auto const icon_name = section.get("Icon");
+						if (!icon_name.empty()) {
+							if (icon_name[0] == '/') {
+								return std::filesystem::path(icon_name);
+							} else {
+								return icon_name;
+							}
+						}
+					}
+					return std::nullopt;
+				}();
+
+				return ApplicationCache::Action {
+					.name = name,
+					.exec = [&]() -> std::optional<std::string> {
+					    if (section.has("Exec")) {
+						    auto s = section.get("Exec");
+						    if (!s.empty()) {
+							    // Either deprecated or not used...
+							    replace_all(s, "%f", "");
+							    replace_all(s, "%F", "");
+							    replace_all(s, "%u", "");
+							    replace_all(s, "%U", "");
+							    replace_all(s, "%d", "");
+							    replace_all(s, "%D", "");
+							    replace_all(s, "%n", "");
+							    replace_all(s, "%N", "");
+							    replace_all(s, "%v", "");
+							    replace_all(s, "%M", "");
+
+							    replace_all(s, "%c", name);
+							    if (icon) {
+								    if (auto const p
+								        = std::get_if<std::filesystem::path>(
+								            &*icon)) {
+									    replace_all(s, "%i",
+									        "--icon '" + p->string() + "'");
+								    } else if (auto const n
+								        = std::get_if<std::string>(&*icon)) {
+									    replace_all(
+									        s, "%i", "--icon '" + *n + "'");
+								    } else {
+									    replace_all(s, "%i", "");
+								    }
+							    } else {
+								    replace_all(s, "%i", "");
+							    }
+							    replace_all(s, "%k", "'" + desktop_file_uri);
+							    return s;
+						    }
+					    }
+					    return std::nullopt;
+					}(),
+					.icon = icon,
+				};
+			};
+
+			m_apps.push_back({
+			    .id = id++,
+			    .desktop_entry_path = file.path(),
+			    .type =
+			        [&]() {
+				        auto const type_str { ini["Desktop Entry"].get(
+					        "Type") };
+				        auto type { ApplicationCache::Type::Application };
+				        if (type_str == "Application")
+					        type = ApplicationCache::Type::Application;
+				        else if (type_str == "Link")
+					        type = ApplicationCache::Type::Link;
+				        else if (type_str == "Directory")
+					        type = ApplicationCache::Type::Directory;
+				        return type;
+			        }(),
+			    .terminal =
+			        [&]() {
+				        if (ini["Desktop Entry"].has("Terminal")) {
+					        return ini["Desktop Entry"]["Terminal"] == "true"
+					            ? true
+					            : false;
+				        }
+				        return false;
+			        }(),
+			    .no_display =
+			        [&]() {
+				        if (ini["Desktop Entry"].has("NoDisplay")) {
+					        return ini["Desktop Entry"]["NoDisplay"] == "true"
+					            ? true
+					            : false;
+				        }
+				        return false;
+			        }(),
+			    .path = [&]() -> std::optional<std::string> {
+				    if (ini["Desktop Entry"].has("Path")) {
+					    return ini["Desktop Entry"]["Path"];
+				    }
+				    return std::nullopt;
+			    }(),
+			    .comment = [&]() -> std::optional<std::string> {
+				    if (ini["Desktop Entry"].has("Comment")) {
+					    return ini["Desktop Entry"]["Comment"];
+				    }
+				    return std::nullopt;
+			    }(),
+			    .actions =
+			        [&]() {
+				        std::vector<ApplicationCache::Action> actions;
+				        for (auto const &[_, v] : ini) {
+					        try {
+						        auto const action = read_action(
+						            std::filesystem::canonical(file.path())
+						                .string(),
+						            v);
+						        actions.push_back(action);
+					        } catch (...) {
+					        }
+				        }
+				        return actions;
+			        }(),
+			    .dbus_activatable =
+			        [&]() {
+				        if (ini["Desktop Entry"].has("DBusActivatable")) {
+					        return ini["Desktop Entry"]["DBusActivatable"]
+					                == "true"
+					            ? true
+					            : false;
+				        }
+				        return false;
+			        }(),
+			});
+		}
+	}
+
+	dump();
+}
+
+void Cache::dump()
+{
+	SQLite::Transaction tx(*m_db);
+
+	SQLite::Statement(*m_db, "DELETE FROM ApplicationCache").exec();
+	SQLite::Statement(*m_db, "DELETE FROM ApplicationActionCache").exec();
+
+	try {
+		SQLite::Statement(
+		    *m_db, "DELETE FROM sqlite_sequence WHERE name='ApplicationCache'")
+		    .exec();
+		SQLite::Statement(*m_db,
+		    "DELETE FROM sqlite_sequence WHERE name='ApplicationActionCache'")
+		    .exec();
+	} catch (std::exception const &) {
+	}
+
+	SQLite::Statement ins_app(*m_db,
+	    "INSERT INTO ApplicationCache(type, desktop_entry_path, terminal, "
+	    "no_display, path, comment, dbus_activatable) VALUES (?,?,?,?,?,?,?)");
+
+	SQLite::Statement ins_act(*m_db,
+	    "INSERT INTO ApplicationActionCache(id_app, name, exec, icon) VALUES "
+	    "(?,?,?,?)");
+
+	for (auto &app : m_apps) {
+		ins_app.reset();
+		ins_app.clearBindings();
+		ins_app.bind(1, static_cast<int>(app.type));
+		ins_app.bind(2, app.desktop_entry_path.string());
+		ins_app.bind(3, app.terminal ? 1 : 0);
+		ins_app.bind(4, app.no_display ? 1 : 0);
+		if (app.path)
+			ins_app.bind(5, *app.path);
+		else
+			ins_app.bind(5);
+		if (app.comment)
+			ins_app.bind(6, *app.comment);
+		else
+			ins_app.bind(6);
+		ins_app.bind(7, app.dbus_activatable ? 1 : 0);
+		ins_app.exec();
+
+		app.id = m_db->getLastInsertRowid();
+
+		for (auto const &action : app.actions) {
+			ins_act.reset();
+			ins_act.clearBindings();
+			ins_act.bind(1, app.id);
+			ins_act.bind(2, action.name);
+			if (action.exec)
+				ins_act.bind(3, *action.exec);
+			else
+				ins_act.bind(3);
+
+			if (action.icon) {
+				std::string str;
+				if (auto const *s = std::get_if<std::string>(&*action.icon)) {
+					str = *s;
+				} else if (auto const *p
+				    = std::get_if<std::filesystem::path>(&*action.icon)) {
+					str = std::filesystem::canonical(*p).string();
+				}
+				ins_act.bind(4, str);
+			} else {
+				ins_act.bind(4);
+			}
+			ins_act.exec();
+		}
+	}
+
+	tx.commit();
+}
+
+void Cache::load()
+{
+	m_apps.clear();
+
+	SQLite::Statement get_apps(*m_db,
+	    "SELECT id, type, desktop_entry_path, terminal, no_display, path, "
+	    "comment, dbus_activatable "
+	    "FROM ApplicationCache");
+
+	std::unordered_map<std::int64_t, std::size_t> id_to_index;
+
+	while (get_apps.executeStep()) {
+		ApplicationCache app {};
+		app.id = get_apps.getColumn(0).getInt64();
+		app.type = static_cast<ApplicationCache::Type>(
+		    get_apps.getColumn(1).getInt());
+		app.desktop_entry_path
+		    = std::filesystem::path(get_apps.getColumn(2).getString());
+		app.terminal = get_apps.getColumn(3).getInt() != 0;
+		app.no_display = get_apps.getColumn(4).getInt() != 0;
+
+		if (!get_apps.getColumn(5).isNull())
+			app.path = std::string(get_apps.getColumn(5).getString());
+		else
+			app.path.reset();
+
+		if (!get_apps.getColumn(6).isNull())
+			app.comment = std::string(get_apps.getColumn(6).getString());
+		else
+			app.comment.reset();
+
+		app.dbus_activatable = get_apps.getColumn(7).getInt() != 0;
+
+		id_to_index.emplace(app.id, m_apps.size());
+		m_apps.push_back(std::move(app));
+	}
+
+	if (m_apps.empty())
+		return;
+
+	SQLite::Statement get_actions(*m_db,
+	    "SELECT id_app, name, exec, icon "
+	    "FROM ApplicationActionCache "
+	    "ORDER BY id_app");
+
+	while (get_actions.executeStep()) {
+		auto id_app = get_actions.getColumn(0).getInt64();
+		auto it = id_to_index.find(id_app);
+		if (it == id_to_index.end())
+			continue;
+
+		ApplicationCache::Action action {};
+		action.name = std::string(get_actions.getColumn(1).getString());
+
+		if (!get_actions.getColumn(2).isNull())
+			action.exec = std::string(get_actions.getColumn(2).getString());
+		else
+			action.exec.reset();
+
+		if (!get_actions.getColumn(3).isNull()) {
+			auto const str = get_actions.getColumn(3).getString();
+			if (str.at(0) == '/') {
+				action.icon
+				    = std::filesystem::canonical(std::filesystem::path(str));
+			} else {
+				action.icon = str;
+			}
+		} else {
+			action.icon.reset();
+		}
+
+		m_apps[it->second].actions.push_back(std::move(action));
+	}
+}
+
+} // namespace Waylight

src/Cache.hpp

@@ -0,0 +1,66 @@
+#pragma once
+
+#include <filesystem>
+#include <optional>
+#include <string>
+#include <thread>
+#include <variant>
+#include <vector>
+
+#include "InotifyWatcher.hpp"
+#include <SQLiteCpp/Database.h>
+
+namespace Waylight {
+
+struct ApplicationCache {
+	enum class Type {
+		Application,
+		Link,
+		Directory,
+	};
+
+	struct Action {
+		std::string name;
+		// May not exist if DBusActivable=true
+		std::optional<std::string> exec;
+		// Freedesktop Desktop Entry Spec 11.2 Table 3 says:
+		//
+		//   If the name is an absolute path, the given file will be used.
+		//   If the name is not an absolute path, the algorithm described in
+		//   the Icon Theme Specification will be used to locate the icon.
+		//
+		// Thus, when deserializing, we will just check if it starts with /
+		// to determine type.
+		std::optional<std::variant<std::filesystem::path, std::string>> icon;
+	};
+
+	int id;
+	std::filesystem::path desktop_entry_path;
+
+	Type type { Type::Application };
+	bool terminal { false };
+	bool no_display { false };
+	std::optional<std::string> path;
+	std::optional<std::string> comment;
+	std::vector<Action> actions; // There should always be at least 1.
+	bool dbus_activatable {};    // Unimplemented for now.
+};
+
+struct Cache {
+	explicit Cache(std::shared_ptr<SQLite::Database> db);
+	~Cache();
+
+	void rescan();
+	void dump();
+	void load();
+
+private:
+	std::vector<ApplicationCache> m_apps;
+	std::vector<std::filesystem::path> m_app_dirs;
+	std::shared_ptr<SQLite::Database> m_db;
+
+	InotifyWatcher m_inotify;
+	std::thread m_inotify_thread;
+};
+
+} // namespace Waylight

src/Config.cpp

@@ -0,0 +1,47 @@
+#include "Config.hpp"
+
+#include <filesystem>
+#include <fstream>
+#include <print>
+
+#include <toml++/toml.hpp>
+
+namespace Waylight {
+
+void Config::write(std::filesystem::path const &path)
+{
+	std::ofstream f(path);
+	if (!f) {
+		throw std::runtime_error("Failed to open config file for writing");
+	}
+	std::println(f, "[settings]");
+	std::println(f, "terminal_cmdline=\"{}\"", terminal_cmdline);
+}
+
+auto Config::load(std::filesystem::path const &config_dir_path) -> Config const
+{
+	if (!std::filesystem::is_directory(config_dir_path))
+		throw std::runtime_error("Provided path is not a directory!");
+
+	Config cfg {};
+
+	std::filesystem::path path_config { config_dir_path / "config.toml" };
+	if (!std::filesystem::is_regular_file(path_config)) {
+		try {
+			std::filesystem::remove_all(path_config);
+		} catch (std::exception const &e) {
+		}
+		cfg.write(path_config);
+	}
+
+	std::println("Config file: {}", path_config.string());
+	auto const tbl { toml::parse_file(path_config.string()) };
+	auto const terminal_cmdline { tbl["settings"]["terminal_cmdline"].value_or(
+		"kitty -c") };
+
+	cfg.terminal_cmdline = terminal_cmdline;
+
+	return cfg;
+}
+
+} // namespace Waylight

src/Config.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <filesystem>
+#include <string>
+
+namespace Waylight {
+
+struct Config {
+	std::string terminal_cmdline { "kitty" };
+
+	void write(std::filesystem::path const &path);
+
+	static auto load(std::filesystem::path const &config_dir_path)
+	    -> Config const;
+};
+
+} // namespace Waylight

src/IconRegistry.cpp

@@ -0,0 +1,449 @@
+#include "IconRegistry.hpp"
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+#include <filesystem>
+#include <ranges>
+#include <stdexcept>
+
+#include <gio/gio.h>
+#include <lunasvg.h>
+#include <mini/ini.h>
+
+namespace Waylight {
+
+static inline auto color_to_string(Color const &c) -> std::string
+{
+	auto const r { c.r / 255.0 }, g { c.g / 255.0 }, b { c.b / 255.0 };
+
+	auto const maxv { std::fmax(r, std::fmax(g, b)) };
+	auto const minv { std::fmin(r, std::fmin(g, b)) };
+	auto const d { maxv - minv };
+
+	double h = 0.0;
+	if (d > 1e-6) {
+		if (maxv == r)
+			h = 60.0 * std::fmod(((g - b) / d), 6.0);
+		else if (maxv == g)
+			h = 60.0 * (((b - r) / d) + 2.0);
+		else
+			h = 60.0 * (((r - g) / d) + 4.0);
+	}
+	if (h < 0.0)
+		h += 360.0;
+
+	if (h >= 345 || h < 15)
+		return "red";
+	if (h < 45)
+		return "orange";
+	if (h < 70)
+		return "yellow";
+	if (h < 170)
+		return "green";
+	if (h < 200)
+		return "teal";
+	if (h < 250)
+		return "cyan";
+	if (h < 290)
+		return "blue";
+	if (h < 330)
+		return "purple";
+	return "pink";
+}
+
+static auto detect_desktop_environment() -> std::string const
+{
+	if (auto const de { getenv("XDG_CURRENT_DESKTOP") })
+		return de;
+	if (auto const sess { getenv("DESKTOP_SESSION") })
+		return sess;
+	return "unknown";
+}
+
+static auto kde_get_theme() -> std::string const
+{
+	std::string home { getenv("HOME") ? getenv("HOME") : "" };
+
+	std::string const paths[] {
+		home + "/.config/kdeglobals",
+		home + "/.config/kdedefaults/kdeglobals",
+	};
+
+	for (auto const &p : paths) {
+		std::ifstream f(p);
+		if (!f)
+			continue;
+		std::string line;
+		auto in_icons { false };
+		while (std::getline(f, line)) {
+			if (line == "[Icons]") {
+				in_icons = true;
+				continue;
+			}
+			if (line.starts_with("["))
+				in_icons = false;
+			if (in_icons && line.starts_with("Theme="))
+				return line.substr(strlen("Theme="));
+		}
+	}
+	return {};
+}
+
+static auto other_get_theme() -> std::string
+{
+	char const *schema_id { "org.gnome.desktop.interface" };
+	char const *key { "icon-theme" };
+
+	GSettingsSchemaSource *src { g_settings_schema_source_get_default() };
+	if (!src)
+		return {};
+
+	GSettingsSchema *schema { g_settings_schema_source_lookup(
+		src, schema_id, TRUE) };
+	if (!schema)
+		return {};
+
+	GSettings *settings { g_settings_new_full(schema, nullptr, nullptr) };
+	g_settings_schema_unref(schema);
+	if (!settings)
+		return {};
+
+	gchar *cstr { g_settings_get_string(settings, key) };
+	g_object_unref(settings);
+	if (!cstr)
+		return {};
+
+	std::string theme { cstr };
+	g_free(cstr);
+	return theme;
+}
+
+static auto get_current_icon_theme() -> std::optional<std::string> const
+{
+	auto de { detect_desktop_environment() };
+	std::transform(de.begin(), de.end(), de.begin(), ::tolower);
+
+	if (de.find("kde") != std::string::npos
+	    || de.find("plasma") != std::string::npos) {
+		if (auto const t = kde_get_theme(); !t.empty()) {
+			return t;
+		}
+	} else {
+		if (auto const t = other_get_theme(); !t.empty()) {
+			return t;
+		}
+	}
+
+	return std::nullopt;
+}
+
+auto IconTheme::lookup(std::string_view const name,
+    std::optional<int> optimal_size) const -> Icon const
+{
+	for (auto const &dir : m_directories) {
+		if (optimal_size && *optimal_size < dir.size)
+			continue;
+
+		for (auto const &dir_entry :
+		    std::filesystem::recursive_directory_iterator(dir.path)) {
+			if (!dir_entry.is_regular_file())
+				continue;
+
+			if (dir_entry.path().stem() != name)
+				continue;
+
+			// This can be derived from the image filename.
+			// But we probably won't need it either way...
+			if (dir_entry.path().extension() == ".icon")
+				continue;
+
+			if (dir_entry.path().extension() == ".svg") {
+				auto const document { lunasvg::Document::loadFromFile(
+					dir_entry.path()) };
+				if (!document) {
+					throw std::runtime_error("Failed to load SVG file");
+				}
+
+				auto const bitmap { document->renderToBitmap() };
+				if (bitmap.width() == 0 || bitmap.height() == 0)
+					continue;
+
+				std::vector<unsigned char> rgba(
+				    bitmap.width() * bitmap.height() * 4);
+				for (size_t i = 0, px = bitmap.width() * bitmap.height();
+				    i < px; ++i) {
+					auto *src { bitmap.data() };
+
+					uint8_t b { src[i * 4 + 0] };
+					uint8_t g { src[i * 4 + 1] };
+					uint8_t r { src[i * 4 + 2] };
+					uint8_t a { src[i * 4 + 3] };
+
+					if (a != 0) {
+						r = (uint8_t)std::min(
+						    255, (int)((r * 255 + a / 2) / a));
+						g = (uint8_t)std::min(
+						    255, (int)((g * 255 + a / 2) / a));
+						b = (uint8_t)std::min(
+						    255, (int)((b * 255 + a / 2) / a));
+					}
+
+					rgba[i * 4 + 0] = r;
+					rgba[i * 4 + 1] = g;
+					rgba[i * 4 + 2] = b;
+					rgba[i * 4 + 3] = a;
+				}
+
+				Image const img {
+					.data = rgba.data(),
+					.width = bitmap.width(),
+					.height = bitmap.height(),
+					.mipmaps = 1,
+					.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
+				};
+
+				auto const tex { LoadTextureFromImage(img) };
+				if (!IsTextureValid(tex)) {
+					throw std::runtime_error(
+					    "Failed to load texture from image");
+				}
+
+				Icon const icon(dir_entry.path(), tex, dir.size);
+				return icon;
+			} else {
+				auto const tex { LoadTexture(dir_entry.path().c_str()) };
+				if (!IsTextureValid(tex)) {
+					throw std::runtime_error(
+					    "Failed to load texture from file");
+				}
+
+				Icon const icon(dir_entry.path(), tex, dir.size);
+				return icon;
+			}
+		}
+	}
+
+	if (optimal_size) {
+		// We failed to find a icon big enough, try again with smaller sizes
+		// than our optimal.
+		return lookup(name, std::nullopt);
+	}
+
+	throw std::runtime_error(
+	    std::format("Failed to find icon `{}` in theme!", name));
+}
+
+IconTheme::IconTheme(std::filesystem::path const &themes_directory_path)
+{
+	for (auto const &dir :
+	    std::filesystem::directory_iterator(themes_directory_path)) {
+		if (!dir.is_directory())
+			continue;
+
+		auto const index_path = dir.path() / "index.theme";
+		if (!std::filesystem::is_regular_file(index_path))
+			continue;
+
+		m_names.push_back(dir.path().filename().string());
+
+		mINI::INIFile ini_file(index_path);
+		mINI::INIStructure ini;
+		ini_file.read(ini);
+
+		auto const &inherits { ini["Icon Theme"]["Inherits"] };
+		std::ranges::copy(std::string_view(inherits) | std::views::split(',')
+		        | std::views::transform(
+		            [](auto &&s) { return std::string(s.begin(), s.end()); }),
+		    std::back_inserter(m_inherits));
+
+		auto const &directories { ini["Icon Theme"]["Directories"] };
+		for (auto const &&dir_entry : directories | std::views::split(',')) {
+			auto const dir_entry_str { std::string(
+				dir_entry.begin(), dir_entry.end()) };
+			auto const path { std::filesystem::path(dir_entry_str) };
+			auto const path_actual { dir.path() / path };
+
+			if (!std::filesystem::is_directory(path_actual))
+				continue;
+
+			auto const &type_raw { ini[dir_entry_str]["Type"] };
+			DirectoryEntry::Type type;
+			if (type_raw == "Fixed") {
+				type = DirectoryEntry::Type::Fixed;
+			} else if (type_raw == "Scalable") {
+				type = DirectoryEntry::Type::Scalable;
+			} else if (type_raw == "Threshold") {
+				type = DirectoryEntry::Type::Threshold;
+			} else {
+				continue;
+			}
+
+			auto const &context_raw { ini[dir_entry_str]["Context"] };
+			DirectoryEntry::Context context;
+			if (context_raw == "Actions") {
+				context = DirectoryEntry::Context::Actions;
+			} else if (context_raw == "Devices") {
+				context = DirectoryEntry::Context::Devices;
+			} else if (context_raw == "FileSystems") {
+				context = DirectoryEntry::Context::FileSystems;
+			} else if (context_raw == "MimeTypes") {
+				context = DirectoryEntry::Context::MimeTypes;
+			} else if (context_raw == "Places") {
+				context = DirectoryEntry::Context::Places;
+			} else {
+				continue;
+			}
+
+			int size { std::atoi(ini[dir_entry_str]["Size"].c_str()) };
+			if (size == 0) {
+				if (type == DirectoryEntry::Type::Scalable) {
+					int minSize
+					    = std::atoi(ini[dir_entry_str]["MinSize"].c_str());
+					int maxSize
+					    = std::atoi(ini[dir_entry_str]["MaxSize"].c_str());
+					size = std::max(minSize, maxSize);
+				}
+				if (size == 0)
+					continue;
+			}
+
+			m_directories.push_back({
+			    .path = path_actual,
+			    .size = size,
+			    .type = type,
+			    .context = context,
+			});
+		}
+
+		// Sort by biggest sizes first. This is important for the lookup
+		// algorithm. Mess with this, change that.
+		std::sort(m_directories.begin(), m_directories.end(),
+		    [](DirectoryEntry const &a, DirectoryEntry const &b) {
+			    return a.size > b.size;
+		    });
+	}
+}
+
+IconRegistry::IconRegistry()
+    : m_preferred_theme(get_current_icon_theme())
+{
+	std::vector<std::filesystem::path> theme_directory_paths;
+
+	{
+		auto const *env { getenv("HOME") };
+		if (env && *env) {
+			theme_directory_paths.push_back(
+			    std::filesystem::path(env) / ".icons");
+		}
+	}
+
+	{
+		auto const *env { getenv("XDG_DATA_DIRS") };
+		if (env && *env) {
+			std::ranges::copy(std::string_view(env) | std::views::split(':')
+			        | std::views::transform([](auto &&s) {
+				          return std::filesystem::path(s.begin(), s.end())
+				              / "icons";
+			          })
+			        | std::views::filter([](auto &&p) {
+				          if (!std::filesystem::is_directory(p))
+					          return false;
+				          if (std::filesystem::directory_iterator(p)
+				              == std::filesystem::directory_iterator {})
+					          return false;
+				          return true;
+			          }),
+			    std::back_inserter(theme_directory_paths));
+		}
+	}
+
+	{
+		std::array<std::filesystem::path, 3> const paths {
+			"/usr/share/pixmaps",
+			"/usr/local/share/icons",
+			"/usr/share/icons",
+		};
+		std::copy_if(paths.begin(), paths.end(), theme_directory_paths.begin(),
+		    [](auto const path) { return std::filesystem::exists(path); });
+	}
+
+	for (auto &&path : theme_directory_paths
+	        | std::views::filter([](std::filesystem::path const &path) {
+		          return std::filesystem::is_directory(path);
+	          })) {
+		try {
+			m_themes.push_back(IconTheme(path));
+		} catch (...) {
+		}
+	}
+
+	if (m_themes.empty()) {
+		throw std::runtime_error("Could not find any icon themes.");
+	}
+
+	if (m_preferred_theme) {
+		TraceLog(LOG_INFO,
+		    std::format("Preferred theme: {}", *m_preferred_theme).c_str());
+
+		std::stable_partition(
+		    m_themes.begin(), m_themes.end(), [&](auto const &t) {
+			    return std::any_of(t.names().begin(), t.names().end(),
+			        [&](auto const &e) { return e == *m_preferred_theme; });
+		    });
+	}
+}
+
+auto IconRegistry::lookup(std::string_view const name,
+    std::optional<int> optimal_size, bool symbolic, std::optional<Color> color)
+    -> Icon const &
+{
+	if (!color && m_color)
+		color = m_color;
+
+	std::string color_name {};
+	if (color) {
+		auto const col { color_to_string(*color) };
+		if (!col.empty()) {
+			color_name = "-" + col;
+		}
+	}
+	if (symbolic) {
+		try {
+			auto const n { std::format("{}{}-symbolic", color_name, name) };
+			return lookup_cached(n, optimal_size);
+		} catch (...) {
+			return lookup(name, optimal_size, false, color);
+		}
+	} else {
+		return lookup_cached(
+		    std::string_view(std::format("{}{}", name, color_name)),
+		    optimal_size);
+	}
+}
+
+auto IconRegistry::lookup_cached(std::string_view const name,
+    std::optional<int> optimal_size) -> Icon const &
+{
+	std::string name_s(name);
+	if (m_cached_icons.contains(name_s)) {
+		auto const &icon = m_cached_icons.at(name_s);
+		if (optimal_size && icon.size() >= *optimal_size)
+			return icon;
+	}
+
+	for (auto const &theme : m_themes) {
+		try {
+			auto const icon = theme.lookup(name, optimal_size);
+			m_cached_icons.insert_or_assign(name_s, icon);
+			return m_cached_icons.at(name_s);
+		} catch (...) {
+		}
+	}
+
+	throw std::runtime_error(std::format("Failed to find icon `{}`!", name));
+}
+
+} // namespace Waylight

src/IconRegistry.hpp

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <filesystem>
+#include <optional>
+#include <span>
+#include <unordered_map>
+#include <vector>
+
+#include <raylib.h>
+
+namespace Waylight {
+
+struct Icon {
+	Icon(std::filesystem::path path, Texture2D texture, int size)
+	    : m_path(path)
+	    , m_texture(texture)
+	    , m_size(size)
+	{
+	}
+
+	constexpr auto path() const -> std::filesystem::path const &
+	{
+		return m_path;
+	}
+	constexpr auto texture() const -> Texture2D const & { return m_texture; }
+	constexpr auto size() const -> int const & { return m_size; }
+
+private:
+	std::filesystem::path m_path;
+	Texture2D m_texture;
+	int m_size { 0 };
+};
+
+struct IconTheme {
+	explicit IconTheme(std::filesystem::path const &themes_directory_path);
+	~IconTheme() = default;
+
+	constexpr auto inherits() const -> std::span<std::string const>
+	{
+		return std::span { m_inherits };
+	}
+	auto lookup(std::string_view const name,
+	    std::optional<int> optimal_size = std::nullopt) const -> Icon const;
+	auto names() const -> std::vector<std::string> const & { return m_names; }
+
+private:
+	struct DirectoryEntry {
+		enum class Type {
+			Fixed,
+			Scalable,
+			Threshold,
+		};
+
+		enum class Context {
+			Actions,
+			Devices,
+			FileSystems,
+			MimeTypes,
+			Places,
+		};
+
+		std::filesystem::path path;
+		int size;
+		Type type;
+		Context context;
+	};
+
+	std::vector<std::string> m_names;
+	std::vector<std::string> m_inherits;
+	std::vector<DirectoryEntry> m_directories;
+};
+
+struct IconRegistry {
+	IconRegistry();
+	~IconRegistry() = default;
+
+	auto lookup(std::string_view const name,
+	    std::optional<int> optimal_size = std::nullopt, bool symbolic = false,
+	    std::optional<Color> color = std::nullopt) -> Icon const &;
+	auto color(std::optional<Color> const &color) { m_color = color; }
+
+private:
+	std::optional<Color> m_color { std::nullopt };
+
+	auto lookup_cached(std::string_view const name,
+	    std::optional<int> optimal_size) -> Icon const &;
+
+	std::vector<IconTheme> m_themes;
+	std::unordered_map<std::string, Icon> m_cached_icons;
+	std::optional<std::string> m_preferred_theme;
+};
+
+} // namespace Waylight

src/ImGui.cpp

@@ -0,0 +1,792 @@
+#include "ImGui.hpp"
+
+#include <algorithm>
+#include <cassert>
+#include <cctype>
+#include <cmath>
+#include <format>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include <raylib.h>
+
+namespace Waylight {
+
+namespace {
+
+struct CodepointSpan {
+	u32 codepoint {};
+	usize start {};
+	usize end {};
+};
+
+constexpr inline float px_pos(float x) { return std::floor(x + 0.5f); }
+constexpr inline float px_w(float w) { return std::ceil(w); }
+
+constexpr auto utf8_rune_from_first(char const *s) -> u32
+{
+	u8 b0 = static_cast<u8>(s[0]);
+	if (b0 < 0x80)
+		return b0;
+
+	if ((b0 & 0xE0) == 0xC0)
+		return ((b0 & 0x1F) << 6) | (static_cast<u8>(s[1]) & 0x3F);
+
+	if ((b0 & 0xF0) == 0xE0)
+		return ((b0 & 0x0F) << 12) | ((static_cast<u8>(s[1]) & 0x3F) << 6)
+		    | (static_cast<u8>(s[2]) & 0x3F);
+
+	if ((b0 & 0xF8) == 0xF0)
+		return ((b0 & 0x07) << 18) | ((static_cast<u8>(s[1]) & 0x3F) << 12)
+		    | ((static_cast<u8>(s[2]) & 0x3F) << 6)
+		    | (static_cast<u8>(s[3]) & 0x3F);
+
+	return 0xFFFD;
+}
+
+constexpr auto decode_utf8(std::string_view text) -> std::vector<CodepointSpan>
+{
+	std::vector<CodepointSpan> spans;
+	usize i = 0;
+	spans.reserve(text.size());
+
+	while (i < text.size()) {
+		u8 b = static_cast<u8>(text[i]);
+		usize len = 1;
+
+		if (b < 0x80)
+			len = 1;
+		else if ((b & 0xE0) == 0xC0)
+			len = 2;
+		else if ((b & 0xF0) == 0xE0)
+			len = 3;
+		else if ((b & 0xF8) == 0xF0)
+			len = 4;
+
+		if (i + len > text.size())
+			len = 1;
+
+		u32 cp = utf8_rune_from_first(text.data() + i);
+		spans.push_back({ cp, i, i + len });
+		i += len;
+	}
+
+	return spans;
+}
+
+auto encode_utf8(u32 cp) -> std::string
+{
+	char buf[5] = { 0, 0, 0, 0, 0 };
+	int len = 0;
+	if (cp <= 0x7F) {
+		buf[len++] = static_cast<char>(cp);
+	} else if (cp <= 0x7FF) {
+		buf[len++] = static_cast<char>(0xC0 | (cp >> 6));
+		buf[len++] = static_cast<char>(0x80 | (cp & 0x3F));
+	} else if (cp <= 0xFFFF) {
+		if (cp >= 0xD800 && cp <= 0xDFFF)
+			return {};
+		buf[len++] = static_cast<char>(0xE0 | (cp >> 12));
+		buf[len++] = static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
+		buf[len++] = static_cast<char>(0x80 | (cp & 0x3F));
+	} else if (cp <= 0x10FFFF) {
+		buf[len++] = static_cast<char>(0xF0 | (cp >> 18));
+		buf[len++] = static_cast<char>(0x80 | ((cp >> 12) & 0x3F));
+		buf[len++] = static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
+		buf[len++] = static_cast<char>(0x80 | (cp & 0x3F));
+	} else {
+		return {};
+	}
+	return std::string(buf, len);
+}
+
+auto rune_index_for_byte(std::string_view text, usize byte_offset) -> int
+{
+	auto spans { decode_utf8(text) };
+	int idx = 0;
+	for (auto const &span : spans) {
+		if (span.start >= byte_offset)
+			break;
+		idx++;
+	}
+	if (byte_offset >= text.size())
+		idx = static_cast<int>(spans.size());
+	return idx;
+}
+
+auto clamp_preedit_index(int value, usize text_size) -> usize
+{
+	if (value < 0)
+		return 0;
+	auto const as_size { static_cast<usize>(value) };
+	return std::min(as_size, text_size);
+}
+
+constexpr float HORIZONTAL_PADDING = 6.0f;
+constexpr float VERTICAL_PADDING = 4.0f;
+constexpr double CARET_BLINK_INTERVAL = 0.5;
+constexpr float CARET_DESCENT_FRACTION = 0.25f;
+
+} // namespace
+
+ImGui::ImGui(std::shared_ptr<TextRenderer> text_renderer)
+    : m_text_renderer(text_renderer)
+{
+}
+
+void ImGui::begin(u32 const rune, bool ctrl, bool shift,
+    std::string_view const clipboard,
+    std::function<void(std::string_view const &)> clipboard_set)
+{
+	m_rune = rune;
+	m_ctrl = ctrl;
+	m_shift = shift;
+	m_clipboard = clipboard;
+	m_clipboard_set = clipboard_set;
+}
+
+void ImGui::end()
+{
+	m_rune = false;
+	m_ctrl = false;
+	m_shift = false;
+	m_clipboard = {};
+	m_clipboard_set = nullptr;
+}
+
+void ImGui::set_font(FontHandle font) { m_font = font; }
+
+auto ImGui::focused_text_input() const -> std::optional<usize>
+{
+	if (m_focused_id == 0)
+		return std::nullopt;
+	return m_focused_id;
+}
+
+auto ImGui::text_input_surrounding(usize id, std::pmr::string const &str) const
+    -> std::optional<TextInputSurrounding>
+{
+	auto it { m_ti_states.find(id) };
+	if (it == m_ti_states.end())
+		return std::nullopt;
+	TextInputSurrounding info;
+	info.text.assign(str.data(), str.size());
+	info.caret_byte = std::min(it->second.caret_byte, str.size());
+	info.cursor = static_cast<int>(info.caret_byte);
+	info.anchor = static_cast<int>(info.caret_byte);
+	return info;
+}
+
+auto ImGui::text_input_cursor(usize id) const -> std::optional<TextInputCursor>
+{
+	auto it { m_ti_states.find(id) };
+	if (it == m_ti_states.end())
+		return std::nullopt;
+	TextInputCursor cursor;
+	cursor.rect = it->second.caret_rect;
+	cursor.visible
+	    = it->second.caret_visible && !it->second.preedit_cursor_hidden;
+	return cursor;
+}
+
+void ImGui::ime_commit_text(std::pmr::string &str, std::string_view text)
+{
+	if (m_focused_id == 0)
+		return;
+	auto it { m_ti_states.find(m_focused_id) };
+	if (it == m_ti_states.end())
+		return;
+	auto &state { it->second };
+	usize insert_pos = std::min(state.caret_byte, str.size());
+	if (!text.empty())
+		str.insert(insert_pos, text);
+	state.caret_byte = insert_pos + text.size();
+	std::string_view const view(str.data(), str.size());
+	state.current_rune_idx = rune_index_for_byte(view, state.caret_byte);
+	state.caret_timer = 0.0;
+	state.caret_visible = true;
+	state.external_change = true;
+}
+
+void ImGui::ime_delete_surrounding(
+    std::pmr::string &str, usize before, usize after)
+{
+	if (m_focused_id == 0)
+		return;
+	auto it { m_ti_states.find(m_focused_id) };
+	if (it == m_ti_states.end())
+		return;
+	auto &state { it->second };
+	usize caret_byte { std::min(state.caret_byte, str.size()) };
+	usize start { before > caret_byte ? 0 : caret_byte - before };
+	usize end { std::min(caret_byte + after, str.size()) };
+	if (end > start) {
+		str.erase(start, end - start);
+		state.caret_byte = start;
+		std::string_view const view(str.data(), str.size());
+		state.current_rune_idx = rune_index_for_byte(view, state.caret_byte);
+		state.caret_timer = 0.0;
+		state.caret_visible = true;
+		state.external_change = true;
+	}
+}
+
+void ImGui::ime_set_preedit(std::string text, int cursor_begin, int cursor_end)
+{
+	if (m_focused_id == 0)
+		return;
+	auto it { m_ti_states.find(m_focused_id) };
+	if (it == m_ti_states.end())
+		return;
+	auto &state { it->second };
+	state.preedit_text = std::move(text);
+	state.preedit_cursor_hidden = (cursor_begin == -1 && cursor_end == -1);
+	usize const size = state.preedit_text.size();
+	if (state.preedit_cursor_hidden) {
+		state.preedit_cursor_begin = 0;
+		state.preedit_cursor_end = 0;
+	} else {
+		auto begin_clamped { clamp_preedit_index(cursor_begin, size) };
+		auto end_clamped { clamp_preedit_index(cursor_end, size) };
+		state.preedit_cursor_begin = static_cast<int>(begin_clamped);
+		state.preedit_cursor_end = static_cast<int>(end_clamped);
+	}
+	state.preedit_active
+	    = !state.preedit_text.empty() || !state.preedit_cursor_hidden;
+	if (state.preedit_active) {
+		state.caret_timer = 0.0;
+		state.caret_visible = !state.preedit_cursor_hidden;
+	}
+}
+
+void ImGui::ime_clear_preedit()
+{
+	if (m_focused_id == 0)
+		return;
+	auto it { m_ti_states.find(m_focused_id) };
+	if (it == m_ti_states.end())
+		return;
+	auto &state { it->second };
+	state.preedit_text.clear();
+	state.preedit_cursor_begin = 0;
+	state.preedit_cursor_end = 0;
+	state.preedit_active = false;
+	state.preedit_cursor_hidden = false;
+	state.caret_visible = true;
+	state.caret_timer = 0.0;
+}
+
+size_t utf8_length(std::string_view const &s)
+{
+	size_t count = std::count_if(
+	    s.begin(), s.end(), [](auto const &c) { return (c & 0xC0) != 0x80; });
+	return count;
+}
+
+auto ImGui::text_input(usize id, std::pmr::string &str, Rectangle rec,
+    TextInputOptions options) -> std::bitset<2>
+{
+	assert(id != 0);
+	assert(
+	    m_font.has_value() && "ImGui font must be set before using text input");
+
+	bool submitted { false };
+	bool changed { false };
+
+	auto &state { m_ti_states[id] };
+	assert(!options.multiline && "Multiline not yet implemented.");
+
+	if (m_focused_id == 0)
+		m_focused_id = id;
+
+	if (style().font_size > rec.height) {
+		TraceLog(LOG_WARNING,
+		    std::format("Text size for text input {} is bigger than height ({} "
+		                "> {}). Clipping will occur.",
+		        id, style().font_size, rec.height)
+		        .c_str());
+	}
+
+	std::string_view str_view(str.data(), str.size());
+	auto spans { decode_utf8(str_view) };
+
+	auto is_space = [](u32 cp) -> bool {
+		if (cp == '\n' || cp == '\r' || cp == '\t' || cp == '\v' || cp == '\f')
+			return true;
+		if (cp <= 0x7F)
+			return std::isspace(static_cast<unsigned char>(cp)) != 0;
+		return false;
+	};
+
+	auto clamp_cursor = [&]() -> usize {
+		int const max_idx = static_cast<int>(spans.size());
+		state.current_rune_idx = std::clamp(state.current_rune_idx, 0, max_idx);
+		if (state.current_rune_idx == max_idx)
+			return str.size();
+		return spans[(usize)state.current_rune_idx].start;
+	};
+
+	usize caret_byte = clamp_cursor();
+
+	auto refresh_spans = [&]() {
+		str_view = std::string_view(str.data(), str.size());
+		spans = decode_utf8(str_view);
+		caret_byte = clamp_cursor();
+	};
+
+	auto erase_range = [&](usize byte_begin, usize byte_end) {
+		if (byte_end > byte_begin && byte_begin < str.size()) {
+			str.erase(byte_begin, byte_end - byte_begin);
+			changed = true;
+		}
+	};
+
+	auto selection_range_bytes
+	    = [&](int a_idx, int b_idx) -> std::pair<usize, usize> {
+		int lo = std::max(0, std::min(a_idx, b_idx));
+		int hi = std::max(0, std::max(a_idx, b_idx));
+		usize byte_begin
+		    = (lo >= (int)spans.size()) ? str.size() : spans[(usize)lo].start;
+		usize byte_end
+		    = (hi >= (int)spans.size()) ? str.size() : spans[(usize)hi].start;
+		return { byte_begin, byte_end };
+	};
+
+	auto erase_selection_if_any = [&]() -> bool {
+		if (!state.has_selection(state.current_rune_idx))
+			return false;
+		auto [b, e] = selection_range_bytes(
+		    state.sel_anchor_idx, state.current_rune_idx);
+		if (e > b) {
+			str.erase(b, e - b);
+			changed = true;
+			refresh_spans();
+			state.current_rune_idx = rune_index_for_byte(str_view, b);
+			state.clear_selection();
+		}
+		return true;
+	};
+
+	auto move_left_word = [&]() {
+		while (state.current_rune_idx > 0
+		    && is_space(spans[(usize)(state.current_rune_idx - 1)].codepoint))
+			state.current_rune_idx--;
+		while (state.current_rune_idx > 0
+		    && !is_space(spans[(usize)(state.current_rune_idx - 1)].codepoint))
+			state.current_rune_idx--;
+	};
+	auto move_right_word = [&]() {
+		while (state.current_rune_idx < (int)spans.size()
+		    && is_space(spans[(usize)state.current_rune_idx].codepoint))
+			state.current_rune_idx++;
+		while (state.current_rune_idx < (int)spans.size()
+		    && !is_space(spans[(usize)state.current_rune_idx].codepoint))
+			state.current_rune_idx++;
+	};
+
+	bool caret_activity = false;
+
+	if (m_focused_id == id && m_rune != 0) {
+		bool request_refresh = false;
+
+		auto handle_backspace = [&]() {
+			if (state.current_rune_idx <= 0
+			    || state.current_rune_idx > (int)spans.size())
+				return;
+			if (m_ctrl) {
+				int idx = state.current_rune_idx, scan = idx - 1;
+				while (scan >= 0 && is_space(spans[(usize)scan].codepoint))
+					scan--;
+				while (scan >= 0 && !is_space(spans[(usize)scan].codepoint))
+					scan--;
+				int start_idx = std::max(scan + 1, 0);
+				usize b = spans[(usize)start_idx].start;
+				usize e = (idx >= (int)spans.size()) ? str.size()
+				                                     : spans[(usize)idx].start;
+				erase_range(b, e);
+				state.current_rune_idx = start_idx;
+			} else {
+				auto const &prev = spans[(usize)(state.current_rune_idx - 1)];
+				erase_range(prev.start, prev.end);
+				state.current_rune_idx--;
+			}
+			request_refresh = true;
+		};
+
+		auto handle_delete = [&]() {
+			if (state.current_rune_idx < 0
+			    || state.current_rune_idx >= (int)spans.size()) {
+				if (!m_ctrl)
+					return;
+			}
+			int idx = state.current_rune_idx;
+			if (m_ctrl) {
+				int scan = idx;
+				while (scan < (int)spans.size()
+				    && is_space(spans[(usize)scan].codepoint))
+					scan++;
+				while (scan < (int)spans.size()
+				    && !is_space(spans[(usize)scan].codepoint))
+					scan++;
+				usize b = (idx < (int)spans.size()) ? spans[(usize)idx].start
+				                                    : str.size();
+				usize e = (scan < (int)spans.size()) ? spans[(usize)scan].start
+				                                     : str.size();
+				erase_range(b, e);
+			} else if (idx < (int)spans.size()) {
+				auto const &curr = spans[(usize)idx];
+				erase_range(curr.start, curr.end);
+			}
+			request_refresh = true;
+		};
+
+		bool extend = m_shift;
+
+		switch (m_rune) {
+		case 1: // Left
+			if (!extend)
+				state.clear_selection();
+			if (state.current_rune_idx > 0) {
+				if (extend && state.sel_anchor_idx == -1)
+					state.sel_anchor_idx = state.current_rune_idx;
+				if (m_ctrl)
+					move_left_word();
+				else
+					state.current_rune_idx--;
+				caret_byte = clamp_cursor();
+			}
+			break;
+		case 4: // Right
+			if (!extend)
+				state.clear_selection();
+			if (state.current_rune_idx < (int)spans.size()) {
+				if (extend && state.sel_anchor_idx == -1)
+					state.sel_anchor_idx = state.current_rune_idx;
+				if (m_ctrl)
+					move_right_word();
+				else
+					state.current_rune_idx++;
+				caret_byte = clamp_cursor();
+			}
+			break;
+		case 3: // Up -> home
+			if (!extend)
+				state.clear_selection();
+			if (extend && state.sel_anchor_idx == -1)
+				state.sel_anchor_idx = state.current_rune_idx;
+			state.current_rune_idx = 0;
+			caret_byte = clamp_cursor();
+			break;
+		case 2: // Down -> end
+			if (!extend)
+				state.clear_selection();
+			if (extend && state.sel_anchor_idx == -1)
+				state.sel_anchor_idx = state.current_rune_idx;
+			state.current_rune_idx = (int)spans.size();
+			caret_byte = clamp_cursor();
+			break;
+		case 8: // Backspace
+			if (erase_selection_if_any()) {
+				request_refresh = true;
+				break;
+			}
+			handle_backspace();
+			break;
+		case 0x7F: // Delete
+			if (erase_selection_if_any()) {
+				request_refresh = true;
+				break;
+			}
+			handle_delete();
+			break;
+		case 'a':
+			if (m_ctrl) {
+				state.sel_anchor_idx = 0;
+				state.current_rune_idx = (int)spans.size();
+				request_refresh = true;
+				break;
+			}
+			[[fallthrough]];
+		case 'c':
+			if (m_ctrl) {
+				if (state.has_selection(state.current_rune_idx)
+				    && m_clipboard_set) {
+					auto [b, e] = selection_range_bytes(
+					    state.sel_anchor_idx, state.current_rune_idx);
+					m_clipboard_set(std::string_view(str.data() + b, e - b));
+				}
+				break;
+			}
+			[[fallthrough]];
+		case 'x':
+			if (m_ctrl) {
+				if (state.has_selection(state.current_rune_idx)
+				    && m_clipboard_set) {
+					auto [b, e] = selection_range_bytes(
+					    state.sel_anchor_idx, state.current_rune_idx);
+					m_clipboard_set(std::string_view(str.data() + b, e - b));
+					str.erase(b, e - b);
+					changed = true;
+					request_refresh = true;
+					refresh_spans();
+					state.current_rune_idx = rune_index_for_byte(str_view, b);
+					state.clear_selection();
+				}
+				break;
+			}
+			[[fallthrough]];
+		case 'v':
+			if (m_ctrl && !m_clipboard.empty()) {
+				erase_selection_if_any();
+				if (!options.multiline) {
+					std::string clip2;
+					clip2.reserve(m_clipboard.size());
+					std::copy_if(m_clipboard.begin(), m_clipboard.end(),
+					    clip2.begin(),
+					    [](char ch) { return ch != '\n' && ch != '\r'; });
+					str.insert(caret_byte, clip2);
+					state.current_rune_idx += (int)utf8_length(clip2);
+				} else {
+					str.insert(caret_byte, m_clipboard);
+					state.current_rune_idx += (int)utf8_length(m_clipboard);
+				}
+				changed = true;
+				request_refresh = true;
+				break;
+			} else {
+				goto insert_printable;
+			}
+			break;
+		case '\r':
+		case '\n':
+			if (options.multiline) {
+				erase_selection_if_any();
+				auto encoded { encode_utf8('\n') };
+				if (!encoded.empty()) {
+					str.insert(caret_byte, encoded);
+					state.current_rune_idx++;
+					changed = true;
+					request_refresh = true;
+				}
+			} else {
+				submitted = true;
+			}
+			break;
+		default:
+		insert_printable:
+			if (m_rune >= 0x20) {
+				erase_selection_if_any();
+				auto encoded { encode_utf8(m_rune) };
+				if (!encoded.empty()) {
+					str.insert(caret_byte, encoded);
+					state.current_rune_idx++;
+					changed = true;
+					request_refresh = true;
+				}
+			}
+			break;
+		}
+
+		if (request_refresh)
+			refresh_spans();
+		else
+			caret_byte = clamp_cursor();
+		caret_activity = true;
+	}
+
+	state.caret_byte = caret_byte;
+
+	double const dt = (double)GetFrameTime();
+	if (m_focused_id == id) {
+		if (state.preedit_active && state.preedit_cursor_hidden) {
+			state.caret_visible = false;
+			state.caret_timer = 0.0;
+		} else if (caret_activity) {
+			state.caret_timer = 0.0;
+			state.caret_visible = true;
+		} else {
+			if (state.caret_timer == 0.0)
+				state.caret_visible = true;
+			state.caret_timer += dt;
+			if (state.caret_timer >= CARET_BLINK_INTERVAL) {
+				int toggles = (int)(state.caret_timer / CARET_BLINK_INTERVAL);
+				state.caret_timer
+				    = std::fmod(state.caret_timer, CARET_BLINK_INTERVAL);
+				if (toggles % 2 == 1)
+					state.caret_visible = !state.caret_visible;
+			}
+		}
+	} else {
+		state.caret_visible = false;
+		state.caret_timer = 0.0;
+	}
+
+	Color const bg_col { 16, 16, 16, 100 };
+	Color const border_col { 220, 220, 220, 180 };
+	DrawRectangleRec(rec, bg_col);
+	DrawRectangleLinesEx(rec, 1.0f, border_col);
+
+	float const text_top = rec.y + VERTICAL_PADDING;
+	float const baseline_y = text_top + style().font_size;
+	float const max_caret_h
+	    = std::max(0.0f, rec.height - 2.0f * VERTICAL_PADDING);
+	float caret_height = style().font_size * (1.0f + CARET_DESCENT_FRACTION);
+	caret_height = std::min(
+	    caret_height, max_caret_h > 0.0f ? max_caret_h : caret_height);
+	if (caret_height <= 0.0f)
+		caret_height = style().font_size;
+	float caret_top = baseline_y - style().font_size;
+	float const min_top = rec.y + VERTICAL_PADDING;
+	float const max_top = rec.y + rec.height - VERTICAL_PADDING - caret_height;
+	caret_top = std::clamp(caret_top, min_top, max_top);
+	float caret_bottom = caret_top + caret_height;
+	float const desired_bottom
+	    = baseline_y + style().font_size * CARET_DESCENT_FRACTION;
+	if (caret_bottom < desired_bottom) {
+		float const adjust = desired_bottom - caret_bottom;
+		caret_top = std::min(caret_top + adjust, max_top);
+		caret_bottom = caret_top + caret_height;
+	}
+	state.cursor_position.y = caret_top;
+
+	float const available_width
+	    = std::max(0.0f, rec.width - 2.0f * HORIZONTAL_PADDING);
+	float const base_y = px_pos(baseline_y);
+
+	int const font_px = (int)style().font_size;
+
+	Vector2 prefix_metrics { 0.0f, 0.0f };
+	{
+		std::string_view prefix(str.data(), caret_byte);
+		if (m_text_renderer)
+			prefix_metrics
+			    = m_text_renderer->measure_text(*m_font, prefix, font_px);
+	}
+
+	Vector2 caret_preedit_metrics { 0.0f, 0.0f };
+	bool const has_preedit = state.preedit_active
+	    && (!state.preedit_text.empty() || !state.preedit_cursor_hidden);
+	if (has_preedit && m_text_renderer) {
+		auto pe_end = clamp_preedit_index(
+		    state.preedit_cursor_end, state.preedit_text.size());
+		caret_preedit_metrics = m_text_renderer->measure_text(*m_font,
+		    std::string_view(state.preedit_text.data(), (usize)pe_end),
+		    font_px);
+	}
+
+	Vector2 full_metrics { 0.0f, 0.0f };
+	{
+		std::string display;
+		display.reserve(
+		    str.size() + (has_preedit ? state.preedit_text.size() : 0));
+		display.append(std::string_view(str.data(), caret_byte));
+		if (has_preedit)
+			display.append(state.preedit_text);
+		display.append(
+		    std::string_view(str.data() + caret_byte, str.size() - caret_byte));
+		if (m_text_renderer)
+			full_metrics = m_text_renderer->measure_text(*m_font,
+			    std::string_view(display.data(), display.size()), font_px);
+	}
+
+	float caret_offset = prefix_metrics.x + caret_preedit_metrics.x;
+	state.cursor_position.x = caret_offset;
+
+	if (full_metrics.x <= available_width) {
+		state.scroll_offset.x = 0.0f;
+	} else {
+		float &scroll = state.scroll_offset.x;
+		float caret_local = caret_offset - scroll;
+		float const pad = 8.0f;
+		if (caret_local > available_width - pad)
+			scroll = caret_offset - (available_width - pad);
+		else if (caret_local < pad)
+			scroll = caret_offset - pad;
+		scroll = std::clamp(
+		    scroll, 0.0f, std::max(0.0f, full_metrics.x - available_width));
+	}
+	state.scroll_offset.y = 0.0f;
+
+	float const origin = rec.x + HORIZONTAL_PADDING - state.scroll_offset.x;
+
+	BeginScissorMode(rec.x, rec.y, rec.width, rec.height);
+	{
+		if (m_font.has_value() && m_text_renderer) {
+			Color const &text_color = style().text_color;
+
+			std::string display;
+			display.reserve(
+			    str.size() + (has_preedit ? state.preedit_text.size() : 0));
+			display.append(std::string_view(str.data(), caret_byte));
+			if (has_preedit)
+				display.append(state.preedit_text);
+			display.append(std::string_view(
+			    str.data() + caret_byte, str.size() - caret_byte));
+
+			m_text_renderer->draw_text(*m_font,
+			    std::string_view(display.data(), display.size()),
+			    { origin, base_y }, font_px, text_color);
+
+			if (state.has_selection(state.current_rune_idx)) {
+				auto [sb, se] = selection_range_bytes(
+				    state.sel_anchor_idx, state.current_rune_idx);
+
+				Vector2 sel_prefix = m_text_renderer->measure_text(
+				    *m_font, std::string_view(str.data(), sb), font_px);
+				Vector2 sel_width = m_text_renderer->measure_text(*m_font,
+				    std::string_view(str.data() + sb, se - sb), font_px);
+
+				Rectangle sel_rect { std::floor(origin + sel_prefix.x + 0.5f),
+					std::floor(caret_top + 0.5f),
+					std::max(1.0f, sel_width.x) + 1,
+					std::max(1.0f, std::round(caret_height)) };
+				DrawRectangleRec(sel_rect, style().selection_color);
+
+				m_text_renderer->draw_text(*m_font,
+				    std::string_view(str.data() + sb, se - sb),
+				    { origin + sel_prefix.x, base_y }, font_px,
+				    style().selection_text_color);
+			}
+
+			if (m_focused_id == id && state.caret_visible) {
+				float const caret_x = std::floor(origin + caret_offset + 0.5f);
+				Vector2 const p0 { caret_x, std::floor(caret_top + 0.5f) };
+				Vector2 const p1 { caret_x,
+					std::floor((caret_top + caret_height) + 0.5f) };
+				DrawLineV(p0, p1, text_color);
+			}
+		}
+	}
+	EndScissorMode();
+
+	if (state.external_change) {
+		changed = true;
+		state.external_change = false;
+	}
+
+	return std::bitset<2> { static_cast<unsigned long long>(
+		(submitted ? 1 : 0) | (changed ? 2 : 0)) };
+}
+
+auto ImGui::list_view(usize id, Rectangle bounds, usize elements,
+    std::function<Vector2(usize i)> draw_cb, ListViewOptions options) -> bool
+{
+	auto const &state { m_lv_states[id] };
+
+	bool submitted { false };
+
+	m_next_lv_next = false;
+	m_next_lv_previous = false;
+	m_next_lv_clear = false;
+
+	BeginScissorMode(bounds.x, bounds.y, bounds.width, bounds.height);
+
+	EndScissorMode();
+
+	m_prev_lv_selected_item = state.selected_item;
+
+	return submitted;
+}
+
+} // namespace Waylight

src/ImGui.hpp

@@ -0,0 +1,164 @@
+#pragma once
+
+#include <bitset>
+#include <functional>
+#include <memory>
+#include <optional>
+#include <queue>
+#include <string>
+#include <unordered_map>
+
+#include <raylib.h>
+
+#include "TextRenderer.hpp"
+
+namespace Waylight {
+
+constexpr float DEFAULT_FONT_SIZE { 24 };
+
+struct TextInputOptions {
+	bool multiline { false };
+};
+
+struct ListViewOptions {
+	bool selectable { false };
+};
+
+struct ImGui {
+	struct Style {
+		float font_size { DEFAULT_FONT_SIZE };
+		Color text_color { BLACK };
+		Color preedit_color { BLACK };
+		Color selection_color { 127, 127, 255, 255 };
+		Color selection_text_color { WHITE };
+	};
+
+	explicit ImGui(std::shared_ptr<TextRenderer> text_renderer);
+
+	ImGui(ImGui const &) = delete;
+	auto operator=(ImGui const &) -> ImGui & = delete;
+	ImGui(ImGui &&) = default;
+	auto operator=(ImGui &&) -> ImGui & = default;
+
+	void begin(u32 const rune, bool ctrl, bool shift,
+	    std::string_view const clipboard,
+	    std::function<void(std::string_view const &)> clipboard_set);
+	void end();
+
+	// Bit 0 -> Submitted
+	// Bit 1 -> String changed
+	auto text_input(usize id, std::pmr::string &str, Rectangle rec,
+	    TextInputOptions options = {}) -> std::bitset<2>;
+
+	struct TextInputSurrounding {
+		std::string text;
+		int cursor { 0 };
+		int anchor { 0 };
+		usize caret_byte { 0 };
+	};
+
+	struct TextInputCursor {
+		Rectangle rect {};
+		bool visible { true };
+	};
+
+	auto focused_text_input() const -> std::optional<usize>;
+	auto text_input_surrounding(usize id, std::pmr::string const &str) const
+	    -> std::optional<TextInputSurrounding>;
+	auto text_input_cursor(usize id) const -> std::optional<TextInputCursor>;
+	void ime_commit_text(std::pmr::string &str, std::string_view text);
+	void ime_delete_surrounding(
+	    std::pmr::string &str, usize before, usize after);
+	void ime_set_preedit(std::string text, int cursor_begin, int cursor_end);
+	void ime_clear_preedit();
+
+	auto list_view(usize id, Rectangle bounds, usize elements,
+	    std::function<Vector2(usize i)> draw_cb, ListViewOptions options = {})
+	    -> bool;
+	auto prev_list_view_selected_item() const -> std::optional<usize>
+	{
+		return m_prev_lv_selected_item;
+	}
+
+	void set_font(FontHandle font);
+
+	auto style() -> Style & { return m_styles.back(); }
+	auto push_style(Style const &style) -> Style &
+	{
+		m_styles.push(style);
+		return m_styles.back();
+	}
+	auto push_style() -> Style & { return push_style(style()); }
+
+	[[nodiscard]] inline auto id(std::string_view const str) -> usize
+	{
+		std::hash<std::string_view> hasher;
+		return hasher(str);
+	}
+
+private:
+	struct TextInputState {
+		int current_rune_idx { 0 };
+
+		// y not used if multiline == false
+		Vector2 scroll_offset { 0, 0 };
+		Vector2 cursor_position { 0, 0 };
+
+		bool caret_visible { true };
+		double caret_timer { 0.0 };
+		std::string preedit_text;
+		int preedit_cursor_begin { 0 };
+		int preedit_cursor_end { 0 };
+		bool preedit_active { false };
+		bool preedit_cursor_hidden { false };
+		usize caret_byte { 0 };
+		Rectangle caret_rect {};
+		bool external_change { false };
+		int sel_anchor_idx = -1;
+
+		bool has_selection(int curr_idx) const
+		{
+			return sel_anchor_idx != -1 && sel_anchor_idx != curr_idx;
+		}
+		void clear_selection() { sel_anchor_idx = -1; }
+	};
+
+	struct ListViewState {
+		float scroll_offset_y { 0 };
+		std::optional<usize> selected_item { std::nullopt };
+	};
+
+	std::unordered_map<usize, ListViewState> m_lv_states;
+	std::unordered_map<usize, TextInputState> m_ti_states;
+	bool m_next_lv_next { false };
+	bool m_next_lv_previous { false };
+	bool m_next_lv_clear { false };
+	std::optional<usize> m_prev_lv_selected_item { std::nullopt };
+	usize m_focused_id {};
+	u32 m_rune {}; // 1234 <-> hjkl arrow keys
+	bool m_ctrl {};
+	bool m_shift {};
+	std::string_view m_clipboard {};
+	std::function<void(std::string_view const &)> m_clipboard_set;
+
+	std::queue<Style> m_styles { { Style {} } };
+
+	std::optional<FontHandle> m_font {};
+	std::shared_ptr<TextRenderer> m_text_renderer {};
+};
+
+struct ImGuiGuard {
+	ImGuiGuard(std::shared_ptr<ImGui> imgui, u32 const rune, bool const ctrl,
+	    bool const shift, std::string_view const clipboard,
+	    std::function<void(std::string_view const &)> clipboard_set)
+	    : m_imgui(imgui)
+	{
+		m_imgui->begin(rune, ctrl, shift, clipboard, clipboard_set);
+	}
+	~ImGuiGuard() { m_imgui->end(); }
+
+private:
+	std::shared_ptr<ImGui> m_imgui { nullptr };
+};
+
+} // namespace Waylight

src/InotifyWatcher.cpp

@@ -0,0 +1,241 @@
+#include "InotifyWatcher.hpp"
+
+#include <algorithm>
+#include <array>
+#include <cerrno>
+#include <cstring>
+#include <poll.h>
+#include <stdexcept>
+#include <system_error>
+#include <unistd.h>
+#include <utility>
+
+#include <sys/inotify.h>
+
+namespace Waylight {
+
+namespace {
+constexpr std::uint32_t watch_mask { IN_ATTRIB | IN_CREATE | IN_DELETE
+	| IN_DELETE_SELF | IN_MODIFY | IN_MOVE_SELF | IN_MOVED_FROM | IN_MOVED_TO
+	| IN_CLOSE_WRITE };
+constexpr int poll_timeout_ms { 250 };
+} // namespace
+
+InotifyWatcher::InotifyWatcher()
+    : m_fd(inotify_init1(IN_CLOEXEC))
+{
+	if (m_fd < 0) {
+		throw std::system_error(
+		    errno, std::generic_category(), "inotify_init1 failed");
+	}
+}
+
+InotifyWatcher::~InotifyWatcher()
+{
+	stop();
+
+	if (m_fd >= 0) {
+		::close(m_fd);
+		m_fd = -1;
+	}
+}
+
+void InotifyWatcher::watch_path_recursively(std::filesystem::path const &path)
+{
+	add_watch_recursively(path);
+}
+
+void InotifyWatcher::set_callback(callback_t cb)
+{
+	std::scoped_lock lock(m_watch_mutex);
+	m_callback = std::move(cb);
+}
+
+void InotifyWatcher::run()
+{
+	if (m_running.exchange(true)) {
+		throw std::runtime_error("InotifyWatcher::run called while running");
+	}
+
+	std::array<char, 4096> buffer {};
+	while (m_running.load()) {
+		pollfd fd_set {
+			.fd = m_fd,
+			.events = POLLIN,
+			.revents = 0,
+		};
+
+		int const poll_res { ::poll(&fd_set, 1, poll_timeout_ms) };
+		if (!m_running.load())
+			break;
+
+		if (poll_res < 0) {
+			if (errno == EINTR)
+				continue;
+			if (errno == EBADF || errno == EINVAL)
+				break;
+			throw std::system_error(errno, std::generic_category(), "poll");
+		}
+
+		if (poll_res == 0)
+			continue;
+
+		if (fd_set.revents & (POLLERR | POLLHUP | POLLNVAL))
+			break;
+
+		if (!(fd_set.revents & POLLIN))
+			continue;
+
+		ssize_t const bytes_read { ::read(m_fd, buffer.data(), buffer.size()) };
+		if (bytes_read < 0) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			if (errno == EBADF || errno == EINVAL)
+				break;
+			throw std::system_error(errno, std::generic_category(), "read");
+		}
+
+		ssize_t offset { 0 };
+		while (offset + static_cast<ssize_t>(sizeof(inotify_event))
+		    <= bytes_read) {
+			auto const *event = reinterpret_cast<inotify_event const *>(
+			    buffer.data() + offset);
+			std::string_view name;
+			if (event->len > 0) {
+				auto const *raw_name
+				    = buffer.data() + offset + sizeof(inotify_event);
+				auto const *end
+				    = std::find(raw_name, raw_name + event->len, '\0');
+				name = std::string_view(raw_name, end - raw_name);
+			}
+
+			dispatch_event(event->wd, event->mask, name);
+
+			offset += sizeof(inotify_event) + event->len;
+		}
+	}
+
+	m_running.store(false);
+}
+
+void InotifyWatcher::stop() { m_running.store(false); }
+
+void InotifyWatcher::add_watch_for_path(std::filesystem::path const &path)
+{
+	auto normalized { normalize_path(path) };
+	if (normalized.empty())
+		return;
+
+	auto const key = normalized.string();
+	{
+		std::scoped_lock lock(m_watch_mutex);
+		auto it = m_path_to_watch.find(key);
+		if (it != m_path_to_watch.end())
+			return;
+	}
+
+	int const wd { ::inotify_add_watch(m_fd, normalized.c_str(), watch_mask) };
+	if (wd < 0) {
+		if (errno == ENOENT || errno == ENOTDIR)
+			return;
+		throw std::system_error(errno, std::generic_category(),
+		    "inotify_add_watch failed for " + normalized.string());
+	}
+
+	std::scoped_lock lock(m_watch_mutex);
+	m_watch_to_path.emplace(wd, normalized);
+	m_path_to_watch.emplace(key, wd);
+}
+
+void InotifyWatcher::add_watch_recursively(std::filesystem::path const &path)
+{
+	auto normalized = normalize_path(path);
+	if (normalized.empty())
+		return;
+
+	add_watch_for_path(normalized);
+
+	std::error_code ec;
+	if (!std::filesystem::is_directory(normalized, ec))
+		return;
+
+	try {
+		auto const options {
+			std::filesystem::directory_options::follow_directory_symlink
+			| std::filesystem::directory_options::skip_permission_denied
+		};
+		for (auto const &entry : std::filesystem::recursive_directory_iterator(
+		         normalized, options)) {
+			std::error_code inner_ec;
+			if (!entry.is_directory(inner_ec) || inner_ec)
+				continue;
+			add_watch_for_path(entry.path());
+		}
+	} catch (std::filesystem::filesystem_error const &) {
+	}
+}
+
+void InotifyWatcher::remove_watch(int wd)
+{
+	std::filesystem::path removed_path;
+	{
+		std::scoped_lock lock(m_watch_mutex);
+		auto it { m_watch_to_path.find(wd) };
+		if (it == m_watch_to_path.end())
+			return;
+		removed_path = it->second;
+		m_watch_to_path.erase(it);
+		m_path_to_watch.erase(removed_path.string());
+	}
+
+	::inotify_rm_watch(m_fd, wd);
+}
+
+void InotifyWatcher::dispatch_event(
+    int wd, std::uint32_t mask, std::string_view name)
+{
+	std::filesystem::path base_path;
+	callback_t callback_copy;
+	{
+		std::scoped_lock lock(m_watch_mutex);
+		auto it { m_watch_to_path.find(wd) };
+		if (it == m_watch_to_path.end())
+			return;
+		base_path = it->second;
+		callback_copy = m_callback;
+	}
+
+	auto event_path { base_path };
+	if (!name.empty())
+		event_path /= name;
+
+	if ((mask & IN_ISDIR)
+	    && (mask & (IN_CREATE | IN_MOVED_TO | IN_ATTRIB | IN_CLOSE_WRITE))) {
+		add_watch_recursively(event_path);
+	}
+
+	if (mask & (IN_DELETE_SELF | IN_MOVE_SELF | IN_IGNORED)) {
+		remove_watch(wd);
+	}
+
+	if (callback_copy) {
+		callback_copy(FileWatchEvent {
+		    .path = std::move(event_path),
+		    .mask = mask,
+		});
+	}
+}
+
+std::filesystem::path InotifyWatcher::normalize_path(
+    std::filesystem::path const &path)
+{
+	std::error_code ec;
+	auto normalized { std::filesystem::weakly_canonical(path, ec) };
+	if (ec)
+		normalized = std::filesystem::absolute(path, ec);
+	if (ec)
+		return {};
+	return normalized;
+}
+
+} // namespace Waylight

src/InotifyWatcher.hpp

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <atomic>
+#include <cstdint>
+#include <filesystem>
+#include <functional>
+#include <mutex>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+
+namespace Waylight {
+
+struct FileWatchEvent {
+	std::filesystem::path path;
+	std::uint32_t mask;
+};
+
+class InotifyWatcher {
+public:
+	using callback_t = std::function<void(FileWatchEvent const &)>;
+
+	InotifyWatcher();
+	~InotifyWatcher();
+
+	InotifyWatcher(InotifyWatcher const &) = delete;
+	InotifyWatcher &operator=(InotifyWatcher const &) = delete;
+
+	InotifyWatcher(InotifyWatcher &&) = delete;
+	InotifyWatcher &operator=(InotifyWatcher &&) = delete;
+
+	void watch_path_recursively(std::filesystem::path const &path);
+
+	void set_callback(callback_t cb);
+
+	void run();
+	void stop();
+
+private:
+	void add_watch_for_path(std::filesystem::path const &path);
+	void add_watch_recursively(std::filesystem::path const &path);
+	void remove_watch(int wd);
+
+	void dispatch_event(int wd, std::uint32_t mask, std::string_view name);
+	static std::filesystem::path normalize_path(
+	    std::filesystem::path const &path);
+
+	int m_fd;
+	std::atomic<bool> m_running { false };
+	callback_t m_callback;
+
+	std::mutex m_watch_mutex;
+	std::unordered_map<int, std::filesystem::path> m_watch_to_path;
+	std::unordered_map<std::string, int> m_path_to_watch;
+};
+
+} // namespace Waylight

src/TextRenderer.cpp

@@ -1,56 +1,795 @@
 #include "TextRenderer.hpp"
 
+#include <algorithm>
 #include <cassert>
+#include <chrono>
+#include <cmath>
 #include <cstdlib>
+#include <cstring>
+#include <limits>
 #include <mutex>
 #include <optional>
 #include <string>
 #include <string_view>
 #include <unordered_map>
+#include <utility>
+#include <vector>
 
 #include <fontconfig/fontconfig.h>
 
 #include <raylib.h>
+#include <rlgl.h>
+
+#undef BLACK
+#undef WHITE
+#undef RED
+#undef GREEN
+#undef BLUE
+#undef YELLOW
+#undef MAGENTA
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_GLYPH_H
+#include <hb-ft.h>
+#include <hb.h>
+
+#include <ext/import-font.h>
+#include <msdfgen.h>
+
+namespace Waylight {
+
+namespace {
+
+constexpr int ATLAS_DIMENSION = 1024;
+constexpr int ATLAS_PADDING = 2;
+constexpr float DEFAULT_EM_SCALE = 48.0f;
+
+constexpr float hb_to_em(hb_position_t value, unsigned upem)
+{
+	return static_cast<float>(value)
+	    / (64.0f * static_cast<float>(upem ? upem : 1));
+}
+
+auto ft_library() -> FT_Library
+{
+	static FT_Library library = nullptr;
+	static std::once_flag once;
+	std::call_once(once, [] {
+		if (FT_Init_FreeType(&library) != 0)
+			library = nullptr;
+		else
+			std::atexit([] {
+				if (library)
+					FT_Done_FreeType(library);
+			});
+	});
+	return library;
+}
+
+struct CodepointSpan {
+	uint32_t codepoint {};
+	usize start {};
+	usize end {};
+};
+
+auto decode_utf8(std::string_view text) -> std::vector<CodepointSpan>
+{
+	std::vector<CodepointSpan> spans;
+	usize i = 0;
+	while (i < text.size()) {
+		u8 const byte = static_cast<u8>(text[i]);
+		usize const start = i;
+		usize length = 1;
+		uint32_t cp = 0xFFFD;
+		if (byte < 0x80) {
+			cp = byte;
+		} else if ((byte & 0xE0) == 0xC0) {
+			if (i + 1 < text.size()) {
+				u8 const b1 = static_cast<u8>(text[i + 1]);
+				if ((b1 & 0xC0) == 0x80) {
+					uint32_t t = ((byte & 0x1F) << 6)
+					    | (static_cast<uint32_t>(b1) & 0x3F);
+					if (t >= 0x80) {
+						cp = t;
+						length = 2;
+					}
+				}
+			}
+		} else if ((byte & 0xF0) == 0xE0) {
+			if (i + 2 < text.size()) {
+				u8 const b1 = static_cast<u8>(text[i + 1]);
+				u8 const b2 = static_cast<u8>(text[i + 2]);
+				if ((b1 & 0xC0) == 0x80 && (b2 & 0xC0) == 0x80) {
+					uint32_t t = ((byte & 0x0F) << 12)
+					    | ((static_cast<uint32_t>(b1) & 0x3F) << 6)
+					    | (static_cast<uint32_t>(b2) & 0x3F);
+					if (t >= 0x800 && (t < 0xD800 || t > 0xDFFF)) {
+						cp = t;
+						length = 3;
+					}
+				}
+			}
+		} else if ((byte & 0xF8) == 0xF0) {
+			if (i + 3 < text.size()) {
+				u8 const b1 = static_cast<u8>(text[i + 1]);
+				u8 const b2 = static_cast<u8>(text[i + 2]);
+				u8 const b3 = static_cast<u8>(text[i + 3]);
+				if ((b1 & 0xC0) == 0x80 && (b2 & 0xC0) == 0x80
+				    && (b3 & 0xC0) == 0x80) {
+					uint32_t t = ((byte & 0x07) << 18)
+					    | ((static_cast<uint32_t>(b1) & 0x3F) << 12)
+					    | ((static_cast<uint32_t>(b2) & 0x3F) << 6)
+					    | (static_cast<uint32_t>(b3) & 0x3F);
+					if (t >= 0x10000 && t <= 0x10FFFF) {
+						cp = t;
+						length = 4;
+					}
+				}
+			}
+		}
+
+		spans.push_back(CodepointSpan {
+		    .codepoint = cp,
+		    .start = start,
+		    .end = std::min(text.size(), start + length),
+		});
+		i += length;
+	}
+	return spans;
+}
+
+} // namespace
+
+auto TextRenderer::flush_font(FontRuntime &rt, FontData &fd) -> void
+{
+	rt.glyph_cache.clear();
+	fd.glyphs.clear();
+	rt.pen_x = ATLAS_PADDING;
+	rt.pen_y = ATLAS_PADDING;
+	rt.row_height = 0;
+	if (fd.atlas_img.data)
+		ImageClearBackground(&fd.atlas_img, BLANK);
+	if (fd.atlas.id != 0 && fd.atlas_img.data)
+		UpdateTexture(fd.atlas, fd.atlas_img.data);
+}
+
+auto TextRenderer::allocate_region(FontRuntime &rt, FontData &fd, int width,
+    int height) -> std::optional<std::pair<int, int>>
+{
+	(void)fd;
+	int padded_w = width + ATLAS_PADDING;
+	if (padded_w > rt.atlas_width || height + ATLAS_PADDING > rt.atlas_height)
+		return std::nullopt;
+	if (rt.pen_x + padded_w > rt.atlas_width) {
+		rt.pen_x = ATLAS_PADDING;
+		rt.pen_y += rt.row_height;
+		rt.row_height = 0;
+	}
+	if (rt.pen_y + height + ATLAS_PADDING > rt.atlas_height)
+		return std::nullopt;
+	int x = rt.pen_x;
+	int y = rt.pen_y;
+	rt.pen_x += padded_w;
+	rt.row_height = std::max(rt.row_height, height + ATLAS_PADDING);
+	return std::pair { x, y };
+}
+
+auto TextRenderer::upload_region(FontData &fd, int dst_x, int dst_y, int width,
+    int height, std::vector<Color> const &buffer) -> void
+{
+	Rectangle rec { static_cast<float>(dst_x), static_cast<float>(dst_y),
+		static_cast<float>(width), static_cast<float>(height) };
+	if (fd.atlas.id != 0)
+		UpdateTextureRec(fd.atlas, rec, buffer.data());
+	if (!fd.atlas_img.data)
+		return;
+	auto *pixels = static_cast<Color *>(fd.atlas_img.data);
+	for (int row = 0; row < height; ++row) {
+		auto *dst = pixels + (dst_y + row) * fd.atlas_img.width + dst_x;
+		std::memcpy(dst, buffer.data() + row * width, sizeof(Color) * width);
+	}
+}
+
+auto TextRenderer::generate_glyph(FontRuntime &rt, FontData &fd,
+    u32 glyph_index) -> std::optional<GlyphCacheEntry>
+{
+	auto const gen_start = std::chrono::steady_clock::now();
+	msdfgen::Shape shape;
+	double advance_em = 0.0;
+	msdfgen::GlyphIndex const index(glyph_index);
+	if (!rt.msdf_font
+	    || !msdfgen::loadGlyph(shape, rt.msdf_font, index,
+	        msdfgen::FONT_SCALING_EM_NORMALIZED, &advance_em))
+		return std::nullopt;
+	shape.normalize();
+	// FIXME: Figure out shader
+	// msdfgen::edgeColoringInkTrap(shape, 3.0);
+	auto bounds = shape.getBounds();
+	float const width_em = static_cast<float>(bounds.r - bounds.l);
+	float const height_em = static_cast<float>(bounds.t - bounds.b);
+	double const scale = rt.em_scale;
+	int bmp_w = std::max(
+	    1, static_cast<int>(std::ceil(width_em * scale + 2.0 * rt.px_range)));
+	int bmp_h = std::max(
+	    1, static_cast<int>(std::ceil(height_em * scale + 2.0 * rt.px_range)));
+
+	if (bmp_w + ATLAS_PADDING > rt.atlas_width
+	    || bmp_h + ATLAS_PADDING > rt.atlas_height) {
+		TraceLog(LOG_WARNING, "Glyph %u bitmap %dx%d exceeds atlas %dx%d",
+		    glyph_index, bmp_w, bmp_h, rt.atlas_width, rt.atlas_height);
+		GlyphCacheEntry too_large {};
+		too_large.width = 0;
+		too_large.height = 0;
+		return too_large;
+	}
+
+	auto place = allocate_region(rt, fd, bmp_w, bmp_h);
+	if (!place) {
+		TraceLog(LOG_INFO, "Atlas full, flushing before glyph %u", glyph_index);
+		flush_font(rt, fd);
+		place = allocate_region(rt, fd, bmp_w, bmp_h);
+		if (!place)
+			return std::nullopt;
+	}
+
+	msdfgen::Bitmap<float, 3> msdf_bitmap(bmp_w, bmp_h);
+	msdfgen::Vector2 scale_vec(scale, scale);
+	double const inv_scale = 1.0 / scale;
+	msdfgen::Vector2 translate(-bounds.l + rt.px_range * inv_scale,
+	    -bounds.b + rt.px_range * inv_scale);
+	msdfgen::generateMSDF(
+	    msdf_bitmap, shape, rt.px_range, scale_vec, translate);
+
+	std::vector<Color> buffer(static_cast<usize>(bmp_w) * bmp_h);
+	// FIXME: Figure out shader
+	// for (int y = 0; y < bmp_h; ++y) {
+	//	int const dst_y = bmp_h - 1 - y;
+	//	for (int x = 0; x < bmp_w; ++x) {
+	//		float const *px = msdf_bitmap(x, y);
+	//		auto const r = msdfgen::pixelFloatToByte(px[0]);
+	//		auto const g = msdfgen::pixelFloatToByte(px[1]);
+	//		auto const b = msdfgen::pixelFloatToByte(px[2]);
+	//		buffer[static_cast<usize>(dst_y) * bmp_w + x]
+	//		    = Color { r, g, b, 255 };
+	//	}
+	//}
+
+	auto c1 { (int)std::round(msdf_bitmap(0, 0)[3]) };
+	auto c4 { (int)std::round(msdf_bitmap(bmp_w - 1, bmp_h - 1)[3]) };
+
+	auto sum_white = 0;
+	auto sum_black = 0;
+	for (int y = 0; y < bmp_h; ++y) {
+		for (int x = 0; x < bmp_w; ++x) {
+			float const *px = msdf_bitmap(x, y);
+			auto const r = msdfgen::pixelFloatToByte(px[0]);
+			if (r > 127) {
+				sum_white++;
+			} else {
+				sum_black++;
+			}
+		}
+	}
+	bool flip { sum_white > sum_black && (float)bmp_w / (float)bmp_h > 0.6 };
+	if (c1 == c4) {
+		flip = false;
+	}
+
+	// This really isn't the most accurate thing in the world but should work
+	// for now. Things like commas might be fucked.
+	for (int y = 0; y < bmp_h; ++y) {
+		int const dst_y = bmp_h - 1 - y;
+		for (int x = 0; x < bmp_w; ++x) {
+			float const *px = msdf_bitmap(x, y);
+			auto const r = msdfgen::pixelFloatToByte(px[0]);
+			if (flip) {
+				buffer[static_cast<usize>(dst_y) * bmp_w + x] = Color { 255,
+					255, 255, static_cast<unsigned char>(255 - r) };
+			} else {
+				buffer[static_cast<usize>(dst_y) * bmp_w + x]
+				    = Color { 255, 255, 255, r };
+			}
+		}
+	}
+
+	upload_region(fd, place->first, place->second, bmp_w, bmp_h, buffer);
+
+	GlyphCacheEntry entry;
+	entry.atlas_x = place->first;
+	entry.atlas_y = place->second;
+	entry.width = bmp_w;
+	entry.height = bmp_h;
+
+	entry.glyph.advance = static_cast<float>(advance_em);
+	entry.glyph.plane_bounds.left = static_cast<float>(bounds.l);
+	entry.glyph.plane_bounds.right = static_cast<float>(bounds.r);
+	entry.glyph.plane_bounds.top = static_cast<float>(bounds.t);
+	entry.glyph.plane_bounds.bottom = static_cast<float>(bounds.b);
+	entry.glyph.glyph_bounds.left = static_cast<float>(entry.atlas_x);
+	entry.glyph.glyph_bounds.top = static_cast<float>(entry.atlas_y);
+	entry.glyph.glyph_bounds.right
+	    = static_cast<float>(entry.atlas_x + entry.width);
+	entry.glyph.glyph_bounds.bottom
+	    = static_cast<float>(entry.atlas_y + entry.height);
+
+	auto const gen_end = std::chrono::steady_clock::now();
+	auto const gen_ms
+	    = std::chrono::duration<double, std::milli>(gen_end - gen_start)
+	          .count();
+	if (gen_ms > 2.0)
+		TraceLog(LOG_INFO, "Generated glyph %u in %.2f ms (%dx%d texels)",
+		    glyph_index, gen_ms, entry.width, entry.height);
+	return entry;
+}
+
+auto TextRenderer::ensure_glyph(FontRuntime &rt, FontData &fd, u32 glyph_index,
+    bool mark_usage) -> GlyphCacheEntry *
+{
+	auto it = rt.glyph_cache.find(glyph_index);
+	if (it != rt.glyph_cache.end()) {
+		if (mark_usage)
+			it->second.stamp = rt.frame_stamp;
+		return &it->second;
+	}
+	auto entry = generate_glyph(rt, fd, glyph_index);
+	if (!entry)
+		return nullptr;
+	auto [inserted_it, ok]
+	    = rt.glyph_cache.emplace(glyph_index, std::move(*entry));
+	if (!ok)
+		return nullptr;
+	inserted_it->second.stamp
+	    = mark_usage ? rt.frame_stamp : inserted_it->second.stamp;
+	fd.glyphs[glyph_index] = inserted_it->second.glyph;
+	return &inserted_it->second;
+}
 
 TextRenderer::TextRenderer()
 {
-	static char const msdf_fs_data[] {
-#embed "msdf.fs"
-		, 0
+	static char const msdf_vs_data[] {
+#embed "base.vert"
+		, 0 // cppcheck-suppress syntaxError
 	};
-	m_msdf_shader = LoadShaderFromMemory(nullptr, msdf_fs_data);
+	static char const msdf_fs_data[] {
+#embed "msdf.frag"
+		, 0 // cppcheck-suppress syntaxError
+	};
+	m_msdf_shader = LoadShaderFromMemory(msdf_vs_data, msdf_fs_data);
 	assert(IsShaderValid(m_msdf_shader));
+	m_px_range_uniform = GetShaderLocation(m_msdf_shader, "pxRange");
 }
 
-TextRenderer::~TextRenderer() { UnloadShader(m_msdf_shader); }
+TextRenderer::~TextRenderer()
+{
+	for (usize i = 0; i < m_font_sets.size(); ++i) {
+		FontHandle handle;
+		handle.id = i;
+		unload_font(handle);
+	}
+	// Not unloading the shader... I have no clue why, but there's some sort of
+	// double free. I love C interop!!!!
+}
 
 auto TextRenderer::measure_text(FontHandle const font,
     std::string_view const text, int const size) -> Vector2
 {
-	// FIXME: Implement.
-	return {};
+	usize const handle_id = font();
+	if (handle_id >= m_font_sets.size())
+		return Vector2 { 0.0f, 0.0f };
+	auto const &font_set = m_font_sets[handle_id];
+	if (font_set.font_indices.empty())
+		return Vector2 { 0.0f, 0.0f };
+
+	auto placements = shape_text(font, text);
+
+	auto primary_runtime_index = font_set.font_indices.front();
+	if (placements.empty()) {
+		if (primary_runtime_index >= m_font_runtime.size()
+		    || !m_font_runtime[primary_runtime_index])
+			return Vector2 { 0.0f, 0.0f };
+		auto const &rt_primary = *m_font_runtime[primary_runtime_index];
+		float height_em = rt_primary.ascent - rt_primary.descent;
+		return Vector2 { 0.0f, height_em * static_cast<float>(size) };
+	}
+
+	float advance_em = 0.0f;
+	float min_x_em = 0.0f;
+	float max_x_em = 0.0f;
+	bool first = true;
+	bool have_metrics = false;
+	float max_ascent = 0.0f;
+	float min_descent = 0.0f;
+
+	for (auto const &placement : placements) {
+		usize const runtime_index = placement.runtime_index;
+		if (runtime_index >= m_font_runtime.size()
+		    || !m_font_runtime[runtime_index])
+			continue;
+		auto &rt = *m_font_runtime[runtime_index];
+		auto &fd = m_font_data[runtime_index];
+		auto *entry = ensure_glyph(rt, fd, placement.glyph_index, false);
+		if (!entry || entry->width == 0 || entry->height == 0)
+			continue;
+		float const x_offset_em = hb_to_em(placement.x_offset, rt.units_per_em);
+		float const left
+		    = advance_em + x_offset_em + entry->glyph.plane_bounds.left;
+		float const right
+		    = advance_em + x_offset_em + entry->glyph.plane_bounds.right;
+		if (first) {
+			min_x_em = left;
+			max_x_em = right;
+			first = false;
+		} else {
+			min_x_em = std::min(min_x_em, left);
+			max_x_em = std::max(max_x_em, right);
+		}
+		if (!have_metrics) {
+			max_ascent = rt.ascent;
+			min_descent = rt.descent;
+			have_metrics = true;
+		} else {
+			max_ascent = std::max(max_ascent, rt.ascent);
+			min_descent = std::min(min_descent, rt.descent);
+		}
+		advance_em += hb_to_em(placement.x_advance, rt.units_per_em);
+	}
+
+	if (first) {
+		if (primary_runtime_index >= m_font_runtime.size()
+		    || !m_font_runtime[primary_runtime_index])
+			return Vector2 { 0.0f, 0.0f };
+		auto const &rt = *m_font_runtime[primary_runtime_index];
+		float height_em = rt.ascent - rt.descent;
+		return Vector2 { 0.0f, height_em * static_cast<float>(size) };
+	}
+
+	float width_em = std::max(max_x_em, advance_em) - min_x_em;
+	float height_em = 0.0f;
+	if (have_metrics) {
+		height_em = max_ascent - min_descent;
+	} else if (primary_runtime_index < m_font_runtime.size()
+	    && m_font_runtime[primary_runtime_index]) {
+		auto const &rt = *m_font_runtime[primary_runtime_index];
+		height_em = rt.ascent - rt.descent;
+	}
+
+	return Vector2 { width_em * static_cast<float>(size),
+		height_em * static_cast<float>(size) };
 }
 
 auto TextRenderer::draw_text(FontHandle const font, std::string_view const text,
     Vector2 const pos, int const size, Color const color) -> void
 {
+	auto const draw_start = std::chrono::steady_clock::now();
 	int const pos_x = pos.x;
 	int const pos_y = pos.y;
-	// Don't use pos from here on out!
-	// FIXME: Implement.
-	(void)pos_x, (void)pos_y;
+	usize const handle_id = font();
+	if (handle_id >= m_font_sets.size())
+		return;
+	auto const &font_set = m_font_sets[handle_id];
+	if (font_set.font_indices.empty())
+		return;
+
+	auto placements = shape_text(font, text);
+	if (placements.empty())
+		return;
+
+	float const size_f = static_cast<float>(size);
+	float pen_x_em = 0.0f;
+	float pen_y_em = 0.0f;
+	std::vector<usize> updated_stamp;
+	updated_stamp.reserve(font_set.font_indices.size());
+
+	for (auto const &placement : placements) {
+		usize const runtime_index = placement.runtime_index;
+		if (runtime_index >= m_font_runtime.size()
+		    || !m_font_runtime[runtime_index])
+			continue;
+		auto &rt = *m_font_runtime[runtime_index];
+		auto &fd = m_font_data[runtime_index];
+		if (std::find(updated_stamp.begin(), updated_stamp.end(), runtime_index)
+		    == updated_stamp.end()) {
+			rt.frame_stamp++;
+			updated_stamp.push_back(runtime_index);
 		}
 
-auto TextRenderer::load_font(std::filesystem::path const &path)
-    -> std::optional<FontHandle>
+		auto *entry = ensure_glyph(rt, fd, placement.glyph_index, true);
+		if (!entry || entry->width == 0 || entry->height == 0)
+			continue;
+
+		float const advance_em = hb_to_em(placement.x_advance, rt.units_per_em);
+		float const x_offset_em = hb_to_em(placement.x_offset, rt.units_per_em);
+		float const y_offset_em = hb_to_em(placement.y_offset, rt.units_per_em);
+		float const x_base_em = pen_x_em + x_offset_em;
+		float const y_base_em = pen_y_em + y_offset_em;
+		float const scale_px = size_f / static_cast<float>(rt.em_scale);
+		float const margin_px = static_cast<float>(rt.px_range) * scale_px;
+		float const dest_x = pos_x
+		    + (x_base_em + entry->glyph.plane_bounds.left) * size_f - margin_px;
+		float const dest_y = pos_y
+		    - (y_base_em + entry->glyph.plane_bounds.top) * size_f - margin_px;
+		float const dest_w = static_cast<float>(entry->width) * scale_px;
+		float const dest_h = static_cast<float>(entry->height) * scale_px;
+
+		Rectangle source {
+			entry->glyph.glyph_bounds.left,
+			entry->glyph.glyph_bounds.top,
+			static_cast<float>(entry->width),
+			static_cast<float>(entry->height),
+		};
+		Rectangle dest { dest_x, dest_y, dest_w, dest_h };
+		DrawTexturePro(
+		    fd.atlas, source, dest, Vector2 { 0.0f, 0.0f }, 0.0f, color);
+
+		pen_x_em += advance_em;
+		pen_y_em += hb_to_em(placement.y_advance, rt.units_per_em);
+	}
+
+	auto const draw_end = std::chrono::steady_clock::now();
+	auto const draw_ms
+	    = std::chrono::duration<double, std::milli>(draw_end - draw_start)
+	          .count();
+	if (draw_ms > 5.0)
+		TraceLog(LOG_INFO, "draw_text took %.2f ms for %zu glyphs", draw_ms,
+		    placements.size());
+}
+
+auto TextRenderer::load_single_font(std::filesystem::path const &path)
+    -> std::optional<usize>
 {
-	// FIXME: Implement.
+	FT_Library const ft = ft_library();
+	if (!ft)
+		return std::nullopt;
+
+	FT_Face face = nullptr;
+	if (FT_New_Face(ft, path.string().c_str(), 0, &face) != 0)
+		return std::nullopt;
+	if (FT_Select_Charmap(face, FT_ENCODING_UNICODE) != 0) {
+		FT_Done_Face(face);
 		return std::nullopt;
 	}
 
-auto TextRenderer::unload_font(FontHandle const font)
+	auto runtime = std::make_unique<FontRuntime>();
+	runtime->face = face;
+	runtime->atlas_width = ATLAS_DIMENSION;
+	runtime->atlas_height = ATLAS_DIMENSION;
+	runtime->pen_x = ATLAS_PADDING;
+	runtime->pen_y = ATLAS_PADDING;
+	runtime->row_height = 0;
+	runtime->px_range = 0.05; // kDefaultPxRange;
+	runtime->em_scale = DEFAULT_EM_SCALE;
+	runtime->frame_stamp = 0;
+	runtime->units_per_em
+	    = static_cast<unsigned>(face->units_per_EM ? face->units_per_EM : 2048);
+	runtime->ascent = static_cast<float>(face->ascender)
+	    / (64.0f * static_cast<float>(runtime->units_per_em));
+	runtime->descent = static_cast<float>(face->descender)
+	    / (64.0f * static_cast<float>(runtime->units_per_em));
+	float line_height = static_cast<float>(face->height)
+	    / (64.0f * static_cast<float>(runtime->units_per_em));
+	float adv_height = runtime->ascent - runtime->descent;
+	runtime->line_gap = std::max(0.0f, line_height - adv_height);
+
+	runtime->hb_face = hb_ft_face_create_referenced(face);
+	if (!runtime->hb_face) {
+		FT_Done_Face(face);
+		return std::nullopt;
+	}
+	runtime->hb_font = hb_ft_font_create_referenced(face);
+	if (!runtime->hb_font) {
+		hb_face_destroy(runtime->hb_face);
+		FT_Done_Face(face);
+		return std::nullopt;
+	}
+	hb_font_set_scale(runtime->hb_font,
+	    static_cast<int>(runtime->units_per_em) << 6,
+	    static_cast<int>(runtime->units_per_em) << 6);
+	hb_ft_font_set_funcs(runtime->hb_font);
+
+	runtime->msdf_font = msdfgen::adoptFreetypeFont(face);
+	if (!runtime->msdf_font) {
+		hb_font_destroy(runtime->hb_font);
+		hb_face_destroy(runtime->hb_face);
+		FT_Done_Face(face);
+		return std::nullopt;
+	}
+
+	FontData font_data {};
+	font_data.font_path = path;
+	font_data.atlas_img
+	    = GenImageColor(runtime->atlas_width, runtime->atlas_height, BLANK);
+	if (!font_data.atlas_img.data) {
+		msdfgen::destroyFont(runtime->msdf_font);
+		runtime->msdf_font = nullptr;
+		hb_font_destroy(runtime->hb_font);
+		hb_face_destroy(runtime->hb_face);
+		return std::nullopt;
+	}
+	font_data.atlas = LoadTextureFromImage(font_data.atlas_img);
+	if (font_data.atlas.id == 0) {
+		UnloadImage(font_data.atlas_img);
+		msdfgen::destroyFont(runtime->msdf_font);
+		runtime->msdf_font = nullptr;
+		hb_font_destroy(runtime->hb_font);
+		hb_face_destroy(runtime->hb_face);
+		return std::nullopt;
+	}
+	SetTextureFilter(font_data.atlas, TEXTURE_FILTER_BILINEAR);
+	SetTextureWrap(font_data.atlas, TEXTURE_WRAP_CLAMP);
+	flush_font(*runtime, font_data);
+
+	m_font_data.emplace_back(std::move(font_data));
+	m_font_runtime.emplace_back(std::move(runtime));
+	return m_font_data.size() - 1;
+}
+
+auto TextRenderer::load_font(std::filesystem::path const &path,
+    std::span<std::filesystem::path const> fallback_fonts)
+    -> std::optional<FontHandle>
 {
-	// FIXME: Implement.
+	auto primary_index = load_single_font(path);
+	if (!primary_index)
+		return std::nullopt;
+
+	FontSet set;
+	set.font_indices.push_back(*primary_index);
+
+	for (auto const &fallback_path : fallback_fonts) {
+		auto fallback_index = load_single_font(fallback_path);
+		if (!fallback_index) {
+			TraceLog(LOG_WARNING, "Failed to load fallback font: %s",
+			    fallback_path.string().c_str());
+			continue;
+		}
+		set.font_indices.push_back(*fallback_index);
+	}
+
+	m_font_sets.emplace_back(std::move(set));
+	FontHandle handle;
+	handle.id = m_font_sets.size() - 1;
+	return handle;
+}
+
+auto TextRenderer::shape_text(FontHandle const font,
+    std::string_view const text) -> std::vector<GlyphPlacement>
+{
+	std::vector<GlyphPlacement> shaped;
+	if (text.empty())
+		return shaped;
+
+	usize const handle_id = font();
+	if (handle_id >= m_font_sets.size())
+		return shaped;
+	auto const &font_set = m_font_sets[handle_id];
+	if (font_set.font_indices.empty())
+		return shaped;
+
+	auto codepoints = decode_utf8(text);
+	if (codepoints.empty())
+		return shaped;
+
+	constexpr usize kNoFont = std::numeric_limits<usize>::max();
+	std::vector<usize> selections(codepoints.size(), kNoFont);
+	for (usize i = 0; i < codepoints.size(); ++i) {
+		bool matched = false;
+		for (usize candidate = 0; candidate < font_set.font_indices.size();
+		    ++candidate) {
+			usize runtime_index = font_set.font_indices[candidate];
+			if (runtime_index >= m_font_runtime.size())
+				continue;
+			auto const &runtime_ptr = m_font_runtime[runtime_index];
+			if (!runtime_ptr || !runtime_ptr->face)
+				continue;
+			FT_UInt glyph
+			    = FT_Get_Char_Index(runtime_ptr->face, codepoints[i].codepoint);
+			if (glyph != 0) {
+				selections[i] = candidate;
+				matched = true;
+				break;
+			}
+		}
+		if (!matched)
+			selections[i] = kNoFont;
+	}
+
+	usize idx = 0;
+	while (idx < codepoints.size()) {
+		usize font_choice = selections[idx];
+		if (font_choice == kNoFont) {
+			++idx;
+			continue;
+		}
+		if (font_choice >= font_set.font_indices.size())
+			font_choice = 0;
+		usize runtime_index = font_set.font_indices[font_choice];
+		if (runtime_index >= m_font_runtime.size()
+		    || !m_font_runtime[runtime_index]
+		    || !m_font_runtime[runtime_index]->hb_font) {
+			++idx;
+			continue;
+		}
+
+		usize segment_start = codepoints[idx].start;
+		usize segment_end = codepoints[idx].end;
+		usize end_idx = idx + 1;
+		while (
+		    end_idx < codepoints.size() && selections[end_idx] == font_choice) {
+			segment_end = codepoints[end_idx].end;
+			++end_idx;
+		}
+
+		if (segment_end <= segment_start) {
+			idx = end_idx;
+			continue;
+		}
+
+		std::string_view segment
+		    = text.substr(segment_start, segment_end - segment_start);
+		if (segment.empty()) {
+			idx = end_idx;
+			continue;
+		}
+
+		hb_buffer_t *buffer = hb_buffer_create();
+		hb_buffer_add_utf8(buffer, segment.data(),
+		    static_cast<int>(segment.size()), 0,
+		    static_cast<int>(segment.size()));
+		hb_buffer_guess_segment_properties(buffer);
+		hb_shape(m_font_runtime[runtime_index]->hb_font, buffer, nullptr, 0);
+
+		unsigned length = hb_buffer_get_length(buffer);
+		auto *infos = hb_buffer_get_glyph_infos(buffer, nullptr);
+		auto *positions = hb_buffer_get_glyph_positions(buffer, nullptr);
+		for (unsigned i = 0; i < length; ++i) {
+			GlyphPlacement placement;
+			placement.runtime_index = runtime_index;
+			placement.glyph_index = infos[i].codepoint;
+			placement.x_advance = positions[i].x_advance;
+			placement.y_advance = positions[i].y_advance;
+			placement.x_offset = positions[i].x_offset;
+			placement.y_offset = positions[i].y_offset;
+			shaped.emplace_back(placement);
+		}
+		hb_buffer_destroy(buffer);
+		idx = end_idx;
+	}
+
+	return shaped;
+}
+
+auto TextRenderer::unload_font(FontHandle const font) -> void
+{
+	usize const handle_id = font();
+	if (handle_id >= m_font_sets.size())
+		return;
+
+	auto &font_set = m_font_sets[handle_id];
+	for (usize runtime_index : font_set.font_indices) {
+		if (runtime_index >= m_font_runtime.size())
+			continue;
+
+		if (auto &runtime_ptr = m_font_runtime[runtime_index]) {
+			auto &rt = *runtime_ptr;
+			rt.glyph_cache.clear();
+			// No freeing here because they are already cleaned up somewhere...
+			// idk. fml.
+			rt.face = nullptr;
+		}
+		m_font_runtime[runtime_index].reset();
+
+		if (runtime_index < m_font_data.size()) {
+			auto &fd = m_font_data[runtime_index];
+			if (fd.atlas.id != 0)
+				UnloadTexture(fd.atlas);
+			if (fd.atlas_img.data)
+				UnloadImage(fd.atlas_img);
+			fd.atlas = Texture2D {};
+			fd.atlas_img = Image {};
+			fd.glyphs.clear();
+		}
+	}
+	font_set.font_indices.clear();
 }
 
 auto find_font_path(std::string_view path)
@@ -102,3 +841,5 @@ auto find_font_path(std::string_view path)
 	}
 	return final_path;
 }
+
+} // namespace Waylight

src/TextRenderer.hpp

@@ -1,33 +1,65 @@
 #pragma once
 
 #include <filesystem>
+#include <memory>
+#include <optional>
+#include <span>
 #include <unordered_map>
+#include <utility>
 #include <vector>
 
 #include <raylib.h>
 
 #include "common.hpp"
 
-struct FontHandle {
-	auto operator()() const -> auto const & { return id; }
+struct hb_face_t;
+struct hb_font_t;
+struct FT_FaceRec_;
+using FT_Face = FT_FaceRec_ *;
+
+namespace msdfgen {
+class FontHandle;
+}
+
+namespace Waylight {
+
+struct FontHandle { // cppcheck-supress noConstructor
+	FontHandle() = default;
+
+	auto operator()() const -> auto const &
+	{
+		if (id == 0xffffffff) {
+			throw std::runtime_error("Uninitialized FontHandle");
+		}
+		return id;
+	}
 
 private:
-	usize id;
+	friend struct TextRenderer;
+	usize id { 0xffffffff };
 };
 
+struct FontRuntime;
+
 struct TextRenderer {
 	TextRenderer(); // Requires raylib to be initialized!
 	~TextRenderer();
 
+	TextRenderer(TextRenderer const &) = delete;
+	auto operator=(TextRenderer const &) -> TextRenderer & = delete;
+	TextRenderer(TextRenderer &&) = default;
+	auto operator=(TextRenderer &&) -> TextRenderer & = default;
+
 	auto measure_text(FontHandle const font, std::string_view const text,
 	    int const size = 16) -> Vector2;
 	auto draw_text(FontHandle const font, std::string_view const text,
 	    Vector2 const pos, int const size = 16, Color const color = WHITE)
 	    -> void;
 
-	auto load_font(std::filesystem::path const &path)
+	auto load_font(std::filesystem::path const &path,
+	    std::span<std::filesystem::path const> fallback_fonts)
 	    -> std::optional<FontHandle>;
-	auto unload_font(FontHandle const font);
+	auto unload_font(FontHandle const font) -> void;
 
 private:
 	struct FontData {
@@ -48,9 +80,72 @@ private:
 	};
 
 	Shader m_msdf_shader;
+	int m_px_range_uniform { -1 };
 
 	std::vector<FontData> m_font_data;
+	struct GlyphCacheEntry {
+		FontData::Glyph glyph;
+		int atlas_x {};
+		int atlas_y {};
+		int width {};
+		int height {};
+		int stamp {};
+	};
+
+	struct FontRuntime {
+		FT_Face face {};
+		hb_face_t *hb_face {};
+		hb_font_t *hb_font {};
+		msdfgen::FontHandle *msdf_font {};
+
+		int atlas_width {};
+		int atlas_height {};
+		int pen_x {};
+		int pen_y {};
+		int row_height {};
+		float px_range {};
+		float em_scale {};
+		int frame_stamp {};
+
+		unsigned units_per_em {};
+		float ascent {};
+		float descent {};
+		float line_gap {};
+
+		std::unordered_map<u32, GlyphCacheEntry> glyph_cache;
+	};
+
+	std::vector<std::unique_ptr<FontRuntime>> m_font_runtime;
+	struct FontSet {
+		std::vector<usize> font_indices;
+	};
+	std::vector<FontSet> m_font_sets;
+
+	struct GlyphPlacement {
+		usize runtime_index {};
+		u32 glyph_index {};
+		i32 x_advance {};
+		i32 y_advance {};
+		i32 x_offset {};
+		i32 y_offset {};
+	};
+
+	static auto flush_font(FontRuntime &rt, FontData &fd) -> void;
+	static auto allocate_region(FontRuntime &rt, FontData &fd, int width,
+	    int height) -> std::optional<std::pair<int, int>>;
+	static auto upload_region(FontData &fd, int dst_x, int dst_y, int width,
+	    int height, std::vector<Color> const &buffer) -> void;
+	static auto generate_glyph(FontRuntime &rt, FontData &fd, u32 glyph_index)
+	    -> std::optional<GlyphCacheEntry>;
+	static auto ensure_glyph(FontRuntime &rt, FontData &fd, u32 glyph_index,
+	    bool mark_usage) -> GlyphCacheEntry *;
+	auto load_single_font(std::filesystem::path const &path)
+	    -> std::optional<usize>;
+	auto shape_text(FontHandle const font, std::string_view const text)
+	    -> std::vector<GlyphPlacement>;
 };
 
 auto find_font_path(std::string_view path = "sans-serif:style=Regular")
     -> std::optional<std::filesystem::path>;
+
+} // namespace Waylight

src/Theme.hpp

@@ -4,7 +4,11 @@
 
 #include "enum_array.hpp"
 
+namespace Waylight {
+
 struct ColorScheme {
+	Color foreground;
+	Color foreground_preedit;
 	struct {
 		Color background;
 	} window;
@@ -21,12 +25,16 @@ constexpr auto make_default_themes() -> enum_array<Theme, ColorScheme> const
 {
 	enum_array<Theme, ColorScheme> array;
 	array[Theme::Light] = {
+	    .foreground = { 0, 0, 0, 255 },
+	    .foreground_preedit = { 0, 0, 0, 255 },
 	    .window =
 	        {
 	            .background = { 255, 255, 255, 100 },
 	        },
 	};
 	array[Theme::Dark] = {
+	    .foreground = { 255, 255, 255, 255 },
+	    .foreground_preedit = { 255, 255, 255, 255 },
 	    .window =
 	        {
 	            .background = { 0, 0, 0, 100 },
@@ -34,3 +42,5 @@ constexpr auto make_default_themes() -> enum_array<Theme, ColorScheme> const
 	};
 	return array;
 }
+
+} // namespace Waylight

src/Tick.cpp

@@ -1,26 +1,31 @@
 #include "App.hpp"
 
+#include <cassert>
+
 #include <EGL/egl.h>
 #include <GLES3/gl3.h>
-#include <print>
 #include <raylib.h>
 #include <rlgl.h>
 #include <xkbcommon/xkbcommon.h>
 
+#include <optional>
+
+namespace Waylight {
+
 auto App::tick() -> void
 {
+	static std::pmr::string text_input_data {};
+
+	m_ime.bound_text = &text_input_data;
+	m_ime.bound_id = 1;
+	process_pending_text_input();
+
 	if (!m_visible || m_gl.edpy == EGL_NO_DISPLAY
 	    || m_gl.esurf == EGL_NO_SURFACE)
 		return;
 
 	glViewport(0, 0, m_win_w, m_win_h);
 
-	for (auto const cp : m_kbd.typing) {
-		std::println("Char typed: {} ({})  shift={} ctrl={}",
-		    rune_to_string(cp), cp, m_kbd.shift() ? 'y' : 'n',
-		    m_kbd.ctrl() ? 'y' : 'n');
-	}
-
 	if (m_kbd.is_sym_pressed(XKB_KEY_Escape)) {
 		set_visible(!visible());
 		if (m_kbd.ctrl() && m_kbd.shift()) {
@@ -30,13 +35,54 @@ auto App::tick() -> void
 
 	BeginDrawing();
 
-	ClearBackground(BLANK);
+	ClearBackground(theme().window.background);
 
-	DrawFPS(10, 10);
+	{
+		assert(m_gui);
+
+		m_gui->style().preedit_color = theme().foreground_preedit;
+		m_gui->style().text_color = theme().foreground;
+		m_gui->style().selection_color = m_accent_color;
+		m_gui->style().selection_text_color = WHITE;
+
+		u32 rune { 0 };
+		if (!m_kbd.typing.empty()) {
+			rune = m_kbd.typing.back();
+			m_kbd.typing.clear();
+		}
+		ImGuiGuard gui_scope(m_gui, rune, m_kbd.ctrl(), m_kbd.shift(),
+		    clipboard(),
+		    [this](std::string_view const &str) { clipboard(str); });
+
+		Rectangle const input_rect {
+			0.0f,
+			0.0f,
+			static_cast<float>(GetScreenWidth()),
+			static_cast<float>(GetScreenHeight()),
+		};
+		;
+		if (auto const result
+		    = m_gui->text_input(1, text_input_data, input_rect);
+		    result.test(1)) {
+			m_ime.surrounding_dirty = true;
+		} else if (result.test(0)) {
+			if (text_input_data == "kitty") {
+				execute_command(false, "kitty");
+			} else if (text_input_data == "nvim") {
+				execute_command(true, "nvim");
+			}
+
+			text_input_data = "";
+		}
+
+		update_text_input_state(text_input_data, 1, input_rect);
+	}
+
+	DrawTexture(m_ir.lookup("folder", 48).texture(), 48, 48, WHITE);
 
 	EndDrawing();
 
 	eglSwapBuffers(m_gl.edpy, m_gl.esurf);
-	m_kbd.typing.clear();
-	m_kbd.clear_transients();
 }
+
+} // namespace Waylight

src/base.vert

@@ -0,0 +1,19 @@
+#version 100
+
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec3 vertexNormal;
+attribute vec4 vertexColor;
+
+uniform mat4 mvp;
+
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+void main()
+{
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}

src/common.hpp

@@ -1,7 +1,11 @@
 #pragma once
 
+#include <algorithm>
+#include <array>
 #include <cstdint>
 
+namespace Waylight {
+
 using u8 = std::uint8_t;
 using i8 = std::int8_t;
 using u16 = std::uint16_t;
@@ -15,9 +19,8 @@ using isize = std::intptr_t;
 
 [[maybe_unused]] static inline auto rune_to_string(uint32_t cp) -> char const *
 {
-	static char utf8[5] = { 0 };
-	for (auto &c : utf8)
-		c = 0;
+	static std::array<char, 5> utf8 {};
+	std::fill(utf8.begin(), utf8.end(), 0);
 
 	if (cp < 0x80) {
 		utf8[0] = cp;
@@ -35,5 +38,7 @@ using isize = std::intptr_t;
 		utf8[3] = 0x80 | (cp & 0x3F);
 	}
 
-	return utf8;
+	return utf8.data();
 }
+
+} // namespace Waylight

src/enum_array.hpp

@@ -5,28 +5,31 @@
 #include <stdexcept>
 #include <type_traits>
 
+#include "common.hpp"
+
+namespace Waylight {
+
 template<class E> struct enum_traits;
 
 template<class E>
 concept EnumLike = std::is_enum_v<E>;
 
 template<EnumLike E>
-constexpr std::size_t enum_count_v
-    = static_cast<std::size_t>(enum_traits<E>::last)
-    - static_cast<std::size_t>(enum_traits<E>::first) + 1;
+constexpr usize enum_count_v = static_cast<usize>(enum_traits<E>::last)
+    - static_cast<usize>(enum_traits<E>::first) + 1;
 
 template<EnumLike E, class T> struct enum_array {
 	using value_type = T;
 	using enum_type = E;
-	using underlying_index_type = std::size_t;
+	using underlying_index_type = usize;
 
 	static constexpr E first = enum_traits<E>::first;
 	static constexpr E last = enum_traits<E>::last;
-	static constexpr std::size_t size_value = enum_count_v<E>;
+	static constexpr usize size_value = enum_count_v<E>;
 
 	std::array<T, size_value> _data {};
 
-	static constexpr std::size_t size() noexcept { return size_value; }
+	static constexpr usize size() noexcept { return size_value; }
 	constexpr T *data() noexcept { return _data.data(); }
 	constexpr T const *data() const noexcept { return _data.data(); }
 	constexpr T *begin() noexcept { return _data.begin().operator->(); }
@@ -61,9 +64,9 @@ template<EnumLike E, class T> struct enum_array {
 	constexpr void fill(T const &v) { _data.fill(v); }
 
 private:
-	static constexpr std::size_t to_index(E e) noexcept
+	static constexpr usize to_index(E e) noexcept
 	{
-		return static_cast<std::size_t>(e) - static_cast<std::size_t>(first);
+		return static_cast<usize>(e) - static_cast<usize>(first);
 	}
 };
 
@@ -77,3 +80,5 @@ constexpr auto make_enum_array(T &&first_val, U &&...rest)
 	arr._data = { std::forward<T>(first_val), std::forward<U>(rest)... };
 	return arr;
 }
+
+} // namespace Waylight

src/main.cpp

@@ -1,35 +1,31 @@
+#include <algorithm>
 #include <csignal>
 #include <cstdio>
 #include <cstdlib>
 #include <fcntl.h>
+#include <iostream>
 #include <optional>
+#include <print>
 #include <signal.h>
 #include <sys/file.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <cpptrace/cpptrace.hpp>
+#include <cpptrace/from_current.hpp>
+#include <tinyfiledialogs.h>
+
 #include "App.hpp"
 
-bool check_or_signal_running();
+namespace Waylight {
+
+bool signal_running();
 
 std::optional<App> g_app {};
 
-auto main() -> int {
-  if (check_or_signal_running()) {
-    return 0;
-  }
-
-  std::signal(SIGINT, [](int) {
-    if (g_app)
-      g_app->stop();
-  });
-
-  g_app.emplace();
-  g_app->run();
-}
-
-bool check_or_signal_running() {
-  const char *lock_path = "/tmp/waylight.lock";
+bool signal_running()
+{
+	char const *lock_path = "/tmp/waylight.lock";
 	int fd = open(lock_path, O_CREAT | O_RDWR, 0666);
 	if (fd == -1)
 		return false;
@@ -46,7 +42,47 @@ bool check_or_signal_running() {
 		return true;
 	}
 
-  ftruncate(fd, 0);
+	if (ftruncate(fd, 0) == -1) {
+		close(fd);
+		unlink(lock_path);
+		return false;
+	}
+
 	dprintf(fd, "%d\n", getpid());
 	return false;
 }
+
+} // namespace Waylight
+
+auto main() -> int
+{
+	if (Waylight::signal_running()) {
+		return 0;
+	}
+
+	std::signal(SIGINT, [](int) {
+		if (Waylight::g_app)
+			Waylight::g_app->stop();
+	});
+
+	CPPTRACE_TRY
+	{
+		Waylight::g_app.emplace();
+		Waylight::g_app->run();
+	}
+	CPPTRACE_CATCH(std::exception const &e)
+	{
+		std::string what { e.what() };
+		std::ranges::replace(what, '"', '.');
+		std::ranges::replace(what, '\'', '.');
+		std::ranges::replace(what, '`', '.');
+		if (what.empty()) {
+			std::println(std::cerr, "Unexpected exception!");
+		} else {
+			std::println(std::cerr, "Unexpected exception! Error: {}", what);
+		}
+		cpptrace::from_current_exception().print();
+		tinyfd_messageBox(
+		    "Unexpected exception", what.c_str(), "ok", "error", 1);
+	}
+}

todo.txt

@@ -0,0 +1,5 @@
+- [-] Fix text moving left and right based on cursor position (right side of cursor is too left)
+	- [ ] Fix selection using wrong offset for text
+- [x] Implement selection in ImGui::text_edit
+- [x] Implement clipboard copy/paste
+

vendor/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(tinyfiledialogs)

vendor/tinyfiledialogs/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.30)
+
+project(tinyfiledialogs C)
+
+add_library(${PROJECT_NAME} STATIC tinyfiledialogs.c)
+
+target_include_directories(${PROJECT_NAME} PUBLIC include)
+

vendor/tinyfiledialogs/include/tinyfiledialogs.h

@@ -0,0 +1,314 @@
+/* SPDX-License-Identifier: Zlib
+Copyright (c) 2014 - 2025 Guillaume Vareille http://ysengrin.com
+	 ____________________________________________________________________
+	|                                                                    |
+	| 100% compatible C C++  ->  You can rename tinfiledialogs.c as .cpp |
+	|____________________________________________________________________|
+
+********* TINY FILE DIALOGS OFFICIAL WEBSITE IS ON SOURCEFORGE *********
+  _________
+ /         \ tinyfiledialogs.h v3.21.1 [Oct 5, 2025]
+ |tiny file| Unique header file created [November 9, 2014]
+ | dialogs |
+ \____  ___/ http://tinyfiledialogs.sourceforge.net
+      \|     git clone http://git.code.sf.net/p/tinyfiledialogs/code tinyfd
+ ____________________________________________
+|                                            |
+|   email: tinyfiledialogs at ysengrin.com   |
+|____________________________________________|
+ ________________________________________________________________________________
+|  ____________________________________________________________________________  |
+| |                                                                            | |
+| |  - in tinyfiledialogs, char is UTF-8 by default (since v3.6)               | |
+| |                                                                            | |
+| | on windows:                                                                | |
+| |  - for UTF-16, use the wchar_t functions at the bottom of the header file  | |
+| |                                                                            | |
+| |  - _wfopen() requires wchar_t                                              | |
+| |  - fopen() uses char but expects ASCII or MBCS (not UTF-8)                 | |
+| |  - if you want char to be MBCS: set tinyfd_winUtf8 to 0                    | |
+| |                                                                            | |
+| |  - alternatively, tinyfiledialogs provides                                 | |
+| |                        functions to convert between UTF-8, UTF-16 and MBCS | |
+| |____________________________________________________________________________| |
+|________________________________________________________________________________|
+
+If you like tinyfiledialogs, please upvote my stackoverflow answer
+https://stackoverflow.com/a/47651444
+
+- License -
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software.  If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+     __________________________________________
+    |  ______________________________________  |
+    | |                                      | |
+    | | DO NOT USE USER INPUT IN THE DIALOGS | |
+    | |______________________________________| |
+    |__________________________________________|
+*/
+
+#ifndef TINYFILEDIALOGS_H
+#define TINYFILEDIALOGS_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/******************************************************************************************************/
+/**************************************** UTF-8 on Windows ********************************************/
+/******************************************************************************************************/
+#ifdef _WIN32
+/* On windows, if you want to use UTF-8 ( instead of the UTF-16/wchar_t functions at the end of this file )
+Make sure your code is really prepared for UTF-8 (on windows, functions like fopen() expect MBCS and not UTF-8) */
+extern int tinyfd_winUtf8; /* on windows char strings can be 1:UTF-8(default) or 0:MBCS */
+/* for MBCS change this to 0, in tinyfiledialogs.c or in your code */
+
+/* Here are some functions to help you convert between UTF-16 UTF-8 MBSC */
+char * tinyfd_utf8toMbcs(char const * aUtf8string);
+char * tinyfd_utf16toMbcs(wchar_t const * aUtf16string);
+wchar_t * tinyfd_mbcsTo16(char const * aMbcsString);
+char * tinyfd_mbcsTo8(char const * aMbcsString);
+wchar_t * tinyfd_utf8to16(char const * aUtf8string);
+char * tinyfd_utf16to8(wchar_t const * aUtf16string);
+#endif
+/******************************************************************************************************/
+/******************************************************************************************************/
+/******************************************************************************************************/
+
+/************* 3 funtions for C# (you don't need this in C or C++) : */
+char const * tinyfd_getGlobalChar(char const * aCharVariableName); /* returns NULL on error */
+int tinyfd_getGlobalInt(char const * aIntVariableName); /* returns -1 on error */
+int tinyfd_setGlobalInt(char const * aIntVariableName, int aValue); /* returns -1 on error */
+/* aCharVariableName: "tinyfd_version" "tinyfd_needs" "tinyfd_response"
+   aIntVariableName : "tinyfd_verbose" "tinyfd_silent" "tinyfd_allowCursesDialogs"
+				      "tinyfd_forceConsole" "tinyfd_assumeGraphicDisplay" "tinyfd_winUtf8"
+**************/
+
+extern char tinyfd_version[8]; /* contains tinyfd current version number */
+extern char tinyfd_needs[]; /* info about requirements */
+extern int tinyfd_verbose; /* 0 (default) or 1 : on unix, prints the command line calls */
+extern int tinyfd_silent; /* 1 (default) or 0 : on unix, hide errors and warnings from called dialogs */
+
+/** Curses dialogs are difficult to use and counter-intuitive.
+On windows they are only ascii and still uses the unix backslash ! **/
+extern int tinyfd_allowCursesDialogs; /* 0 (default) or 1 */
+
+extern int tinyfd_forceConsole;  /* 0 (default) or 1 */
+/* for unix & windows: 0 (graphic mode) or 1 (console mode).
+0: try to use a graphic solution, if it fails then it uses console mode.
+1: forces all dialogs into console mode even when an X server is present.
+   if enabled, it can use the package Dialog or dialog.exe.
+   on windows it only make sense for console applications */
+
+/* extern int tinyfd_assumeGraphicDisplay; */ /* 0 (default) or 1  */
+/* some systems don't set the environment variable DISPLAY even when a graphic display is present.
+set this to 1 to tell tinyfiledialogs to assume the existence of a graphic display */
+
+extern char tinyfd_response[1024];
+/* if you pass "tinyfd_query" as aTitle,
+the functions will not display the dialogs
+but will return 0 for console mode, 1 for graphic mode.
+tinyfd_response is then filled with the retain solution.
+possible values for tinyfd_response are (all lowercase)
+for graphic mode:
+  windows_wchar windows applescript kdialog zenity zenity3 yad matedialog
+  shellementary qarma shanty boxer python2-tkinter python3-tkinter python-dbus
+  perl-dbus gxmessage gmessage xmessage xdialog gdialog dunst
+for console mode:
+  dialog whiptail basicinput no_solution */
+
+void tinyfd_beep(void);
+
+int tinyfd_notifyPopup(
+	char const * aTitle, /* NULL or "" */
+	char const * aMessage, /* NULL or "" may contain \n \t */
+	char const * aIconType); /* "info" "warning" "error" */
+		/* return has only meaning for tinyfd_query */
+
+int tinyfd_messageBox(
+	char const * aTitle , /* NULL or "" */
+	char const * aMessage , /* NULL or "" may contain \n \t */
+	char const * aDialogType , /* "ok" "okcancel" "yesno" "yesnocancel" */
+	char const * aIconType , /* "info" "warning" "error" "question" */
+	int aDefaultButton ) ;
+		/* 0 for cancel/no , 1 for ok/yes , 2 for no in yesnocancel */
+
+char * tinyfd_inputBox(
+	char const * aTitle , /* NULL or "" */
+	char const * aMessage , /* NULL or "" (\n and \t have no effect) */
+	char const * aDefaultInput ) ;  /* NULL = passwordBox, "" = inputbox */
+		/* returns NULL on cancel */
+
+char * tinyfd_saveFileDialog(
+	char const * aTitle , /* NULL or "" */
+	char const * aDefaultPathAndOrFile , /* NULL or "" , ends with / to set only a directory */
+	int aNumOfFilterPatterns , /* 0  (1 in the following example) */
+	char const * const * aFilterPatterns , /* NULL or char const * lFilterPatterns[1]={"*.txt"} */
+	char const * aSingleFilterDescription ) ; /* NULL or "text files" */
+		/* returns NULL on cancel */
+
+char * tinyfd_openFileDialog(
+	char const * aTitle, /* NULL or "" */
+	char const * aDefaultPathAndOrFile, /* NULL or "" , ends with / to set only a directory */
+	int aNumOfFilterPatterns , /* 0 (2 in the following example) */
+	char const * const * aFilterPatterns, /* NULL or char const * lFilterPatterns[2]={"*.png","*.jpg"}; */
+	char const * aSingleFilterDescription, /* NULL or "image files" */
+	int aAllowMultipleSelects ) ; /* 0 or 1 */
+		/* in case of multiple files, the separator is | */
+		/* returns NULL on cancel */
+
+char * tinyfd_selectFolderDialog(
+	char const * aTitle, /* NULL or "" */
+	char const * aDefaultPath); /* NULL or "" */
+		/* returns NULL on cancel */
+
+char * tinyfd_colorChooser(
+	char const * aTitle, /* NULL or "" */
+	char const * aDefaultHexRGB, /* NULL or "" or "#FF0000" */
+	unsigned char const aDefaultRGB[3] , /* unsigned char lDefaultRGB[3] = { 0 , 128 , 255 }; */
+	unsigned char aoResultRGB[3] ) ; /* unsigned char lResultRGB[3]; */
+		/* aDefaultRGB is used only if aDefaultHexRGB is absent */
+		/* aDefaultRGB and aoResultRGB can be the same array */
+		/* returns NULL on cancel */
+		/* returns the hexcolor as a string "#FF0000" */
+		/* aoResultRGB also contains the result */
+
+
+/************ WINDOWS ONLY SECTION ************************/
+#ifdef _WIN32
+
+/* windows only - utf-16 version */
+int tinyfd_notifyPopupW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aMessage, /* NULL or L"" may contain \n \t */
+	wchar_t const * aIconType); /* L"info" L"warning" L"error" */
+
+/* windows only - utf-16 version */
+int tinyfd_messageBoxW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aMessage, /* NULL or L"" may contain \n \t */
+	wchar_t const * aDialogType, /* L"ok" L"okcancel" L"yesno" */
+	wchar_t const * aIconType, /* L"info" L"warning" L"error" L"question" */
+	int aDefaultButton ); /* 0 for cancel/no , 1 for ok/yes */
+		/* returns 0 for cancel/no , 1 for ok/yes */
+
+/* windows only - utf-16 version */
+wchar_t * tinyfd_inputBoxW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aMessage, /* NULL or L"" (\n nor \t not respected) */
+	wchar_t const * aDefaultInput); /* NULL passwordBox, L"" inputbox */
+
+/* windows only - utf-16 version */
+wchar_t * tinyfd_saveFileDialogW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aDefaultPathAndOrFile, /* NULL or L"" , ends with / to set only a directory */
+	int aNumOfFilterPatterns, /* 0 (1 in the following example) */
+	wchar_t const * const * aFilterPatterns, /* NULL or wchar_t const * lFilterPatterns[1]={L"*.txt"} */
+	wchar_t const * aSingleFilterDescription); /* NULL or L"text files" */
+		/* returns NULL on cancel */
+
+/* windows only - utf-16 version */
+wchar_t * tinyfd_openFileDialogW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aDefaultPathAndOrFile, /* NULL or L"" , ends with / to set only a directory */
+	int aNumOfFilterPatterns , /* 0 (2 in the following example) */
+	wchar_t const * const * aFilterPatterns, /* NULL or wchar_t const * lFilterPatterns[2]={L"*.png","*.jpg"} */
+	wchar_t const * aSingleFilterDescription, /* NULL or L"image files" */
+	int aAllowMultipleSelects ) ; /* 0 or 1 */
+		/* in case of multiple files, the separator is | */
+		/* returns NULL on cancel */
+
+/* windows only - utf-16 version */
+wchar_t * tinyfd_selectFolderDialogW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aDefaultPath); /* NULL or L"" */
+		/* returns NULL on cancel */
+
+/* windows only - utf-16 version */
+wchar_t * tinyfd_colorChooserW(
+	wchar_t const * aTitle, /* NULL or L"" */
+	wchar_t const * aDefaultHexRGB, /* NULL or L"#FF0000" */
+	unsigned char const aDefaultRGB[3], /* unsigned char lDefaultRGB[3] = { 0 , 128 , 255 }; */
+	unsigned char aoResultRGB[3]); /* unsigned char lResultRGB[3]; */
+		/* returns the hexcolor as a string L"#FF0000" */
+		/* aoResultRGB also contains the result */
+		/* aDefaultRGB is used only if aDefaultHexRGB is NULL */
+		/* aDefaultRGB and aoResultRGB can be the same array */
+		/* returns NULL on cancel */
+
+#endif /*_WIN32 */
+
+#ifdef	__cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /* TINYFILEDIALOGS_H */
+
+/*
+ ________________________________________________________________________________
+|  ____________________________________________________________________________  |
+| |                                                                            | |
+| | on windows:                                                                | |
+| |  - for UTF-16, use the wchar_t functions at the bottom of the header file  | |
+| |  - _wfopen() requires wchar_t                                              | |
+| |                                                                            | |
+| |  - in tinyfiledialogs, char is UTF-8 by default (since v3.6)               | |
+| |  - but fopen() expects MBCS (not UTF-8)                                    | |
+| |  - if you want char to be MBCS: set tinyfd_winUtf8 to 0                    | |
+| |                                                                            | |
+| |  - alternatively, tinyfiledialogs provides                                 | |
+| |                        functions to convert between UTF-8, UTF-16 and MBCS | |
+| |____________________________________________________________________________| |
+|________________________________________________________________________________|
+
+- This is not for ios nor android (it works in termux though).
+- The files can be renamed with extension ".cpp" as the code is 100% compatible C C++
+  (just comment out << extern "C" >> in the header file)
+- Windows is fully supported from XP to 10 (maybe even older versions)
+- C# & LUA via dll, see files in the folder EXTRAS
+- OSX supported from 10.4 to latest (maybe even older versions)
+- Do not use " and ' as the dialogs will be displayed with a warning
+  instead of the title, message, etc...
+- There's one file filter only, it may contain several patterns.
+- If no filter description is provided,
+  the list of patterns will become the description.
+- On windows link against Comdlg32.lib and Ole32.lib
+  (on windows the no linking claim is a lie)
+- On unix: it tries command line calls, so no such need (NO LINKING).
+- On unix you need one of the following:
+  applescript, kdialog, zenity, matedialog, shellementary, qarma, shanty, boxer,
+  yad, python (2 or 3)/tkinter/python-dbus (optional), Xdialog
+  or curses dialogs (opens terminal if running without console).
+- One of those is already included on most (if not all) desktops.
+- In the absence of those it will use gdialog, gxmessage or whiptail
+  with a textinputbox. If nothing is found, it switches to basic console input,
+  it opens a console if needed (requires xterm + bash).
+- for curses dialogs you must set tinyfd_allowCursesDialogs=1
+- You can query the type of dialog that will be used (pass "tinyfd_query" as aTitle)
+- String memory is preallocated statically for all the returned values.
+- File and path names are tested before return, they should be valid.
+- tinyfd_forceConsole=1; at run time, forces dialogs into console mode.
+- On windows, console mode only make sense for console applications.
+- On windows, console mode is not implemented for wchar_T UTF-16.
+- Mutiple selects are not possible in console mode.
+- The package dialog must be installed to run in curses dialogs in console mode.
+  It is already installed on most unix systems.
+- On osx, the package dialog can be installed via
+  http://macappstore.org/dialog or http://macports.org
+- On windows, for curses dialogs console mode,
+  dialog.exe should be copied somewhere on your executable path.
+  It can be found at the bottom of the following page:
+  http://andrear.altervista.org/home/cdialog.php
+*/