Tool to query which installed applications handle a given MIME type

mimetest.c

/*
** Copyright (C) Sebastian Pipping <sebastian@pipping.org>
** Licensed under GPL v2 or later
**
** 2013-06-01
**
** Compilation
** ===========
**
** # gcc $(pkg-config --libs --cflags-only-I gio-2.0) -o mimetest mimetest.c
**
**
** Example output
** ==============
**
** # ./mimetest text/plain
** Applications supporting MIME type "text/plain":
** [1]
**   id = "kde4-kwrite.desktop"
**   name = "KWrite"
**   command line = "kwrite %U"
**
** [2]
**   id = "kde4-kate.desktop"
**   name = "Kate"
**   command line = "kate -b %U"
**
** [3]
**   id = "kde4-okularApplication_txt.desktop"
**   name = "Okular"
**   command line = "okular %U %i -caption %c"
**
** [4]
**   id = "diffuse.desktop"
**   name = "Diffuse Merge Tool"
**   command line = "diffuse -s %F"
*/

#include <stdio.h>
#include <gio/gio.h>


#define INDENT "  "


int main(int argc, char ** argv) {
	if (argc != 2) {
		fprintf(stderr, "USAGE: %s MIME_TYPE\n", argv[0]);
		return 1;
	}

	g_type_init();

	const char * const mime_type = argv[1];
	GList * p_supporting_app_list = g_app_info_get_recommended_for_type(mime_type);
	int index = 0;

	if (! p_supporting_app_list) {
		fprintf(stderr, "ERROR: MIME type \"%s\" invalid or not supported by any installed application.\n", mime_type);
		return 2;
	}

	printf("Applications supporting MIME type \"%s\":\n", mime_type);
	for(; p_supporting_app_list; p_supporting_app_list = p_supporting_app_list->next, index++) {
		printf("[%d]\n"
				INDENT "id = \"%s\"\n"
				INDENT "name = \"%s\"\n"
				INDENT "command line = \"%s\"\n"
				"%s",
			index + 1,
			g_app_info_get_id(p_supporting_app_list->data),
			g_app_info_get_name(p_supporting_app_list->data),
			g_app_info_get_commandline(p_supporting_app_list->data),
			(p_supporting_app_list->next ? "\n" : ""));
	}
	return 0;
}