Get something working

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

programs/dcfg_dump.c

@@ -1,9 +1,11 @@
 #include <dcfg.h>
 
 #include <alloca.h>
+#include <getopt.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 void walk_value(dcfg_Value *value, bool evaluate, int indent, bool first);
 #define WALK(v, e, i) walk_value((v), (e), (i), true)
@@ -16,11 +18,25 @@ static void print_indent(int indent)
 
 int main(int argc, char *argv[])
 {
-	if (argc < 2) {
-		printf("Usage: %s <dcfg file>\n", argv[0]);
+	bool evaluate = false;
+	int opt;
+	while ((opt = getopt(argc, argv, "e")) != -1) {
+		switch (opt) {
+		case 'e':
+			evaluate = true;
+			break;
+		default:
+			fprintf(stderr, "Usage: %s [-e] <dcfg file>\n", argv[0]);
+			return 1;
+		}
+	}
+	if (optind >= argc) {
+		fprintf(stderr, "Usage: %s [-e] <dcfg file>\n", argv[0]);
 		return 1;
 	}
 
+	char const *path = argv[optind];
+
 	dcfg_InstanceCreateInfo ci = { 0 };
 	dcfg_Instance *instance = dcfg_make_instance(&ci);
 	if (!instance) {
@@ -29,7 +45,7 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
-	dcfg_Value *value = dcfg_parse(instance, dcfg_SV(argv[1]));
+	dcfg_Value *value = dcfg_parse(instance, dcfg_SV(path));
 	if (!value) {
 		printf("Failed to parse DCFG file. Error: %s\n",
 		    dcfg_last_error(instance));
@@ -37,7 +53,7 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
-	WALK(value, false, 0);
+	WALK(value, evaluate, 0);
 
 	dcfg_destroy(value);
 	dcfg_destroy_instance(instance);