Use XDG paths in addition to the defaults when looking for icons and applications

src/launcher/apps-common.c

@@ -19,6 +19,7 @@
 /* http://standards.freedesktop.org/desktop-entry-spec/ */
 
 #include "apps-common.h"
+#include "common.h"
 
 #include <glib.h>
 #include <stdio.h>
@@ -194,3 +195,25 @@ void test_read_desktop_file()
 	printf("Name:%s Icon:%s Exec:%s\n", entry.name, entry.icon, entry.exec);
 	fprintf(stdout, "\033[0m");
 }
+
+GSList *apps_locations = NULL;
+// Do not free the result.
+const GSList *get_apps_locations()
+{
+	if (apps_locations)
+		return apps_locations;
+
+	apps_locations = load_locations_from_env(apps_locations, "XDG_DATA_HOME", "applications", NULL);
+
+	apps_locations = g_slist_append(apps_locations, g_build_filename(g_get_home_dir(), ".local/share/applications", NULL));
+
+	apps_locations = load_locations_from_env(apps_locations, "XDG_DATA_DIRS", "applications", NULL);
+
+	apps_locations = g_slist_append(apps_locations, g_strdup("/usr/local/share/applications"));
+	apps_locations = g_slist_append(apps_locations, g_strdup("/usr/share/applications"));
+	apps_locations = g_slist_append(apps_locations, g_strdup("/opt/share/applications"));
+
+	apps_locations = slist_remove_duplicates(apps_locations, g_str_equal, g_free);
+
+	return apps_locations;
+}

src/launcher/apps-common.h

@@ -7,6 +7,8 @@
 #ifndef APPS_COMMON_H
 #define APPS_COMMON_H
 
+#include <glib.h>
+
 typedef struct DesktopEntry {
 	char *name;
 	char *exec;
@@ -27,4 +29,8 @@ int read_desktop_file(const char *path, DesktopEntry *entry);
 // Empties DesktopEntry: releases the memory of the *members* of entry.
 void free_desktop_entry(DesktopEntry *entry);
 
+// Returns a list of the directories used to store desktop files.
+// Do not free the result, it is cached.
+const GSList *get_apps_locations();
+
 #endif

src/launcher/icon-theme-common.c

@@ -20,11 +20,13 @@
 
 #include "icon-theme-common.h"
 
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "apps-common.h"
+#include "common.h"
 
 #define ICON_DIR_TYPE_SCALABLE 0
 #define ICON_DIR_TYPE_FIXED 1
@@ -50,19 +52,22 @@ const GSList *get_icon_locations()
 	if (icon_locations)
 		return icon_locations;
 
-	gchar *path;
-	path = g_build_filename(g_get_home_dir(), ".icons", NULL);
-	icon_locations = g_slist_append(icon_locations, g_strdup(path));
-	g_free(path);
-	path = g_build_filename(g_get_home_dir(), ".local/share/icons", NULL);
-	icon_locations = g_slist_append(icon_locations, g_strdup(path));
-	g_free(path);
+	icon_locations = load_locations_from_env(icon_locations, "XDG_DATA_HOME", ".icons", NULL);
+
+	icon_locations = g_slist_append(icon_locations, g_build_filename(g_get_home_dir(), ".icons", NULL));
+	icon_locations = g_slist_append(icon_locations, g_build_filename(g_get_home_dir(), ".local/share/icons", NULL));
+
+	icon_locations = load_locations_from_env(icon_locations, "XDG_DATA_DIRS", ".icons", ".pixmaps", NULL);
+
 	icon_locations = g_slist_append(icon_locations, g_strdup("/usr/local/share/icons"));
 	icon_locations = g_slist_append(icon_locations, g_strdup("/usr/local/share/pixmaps"));
 	icon_locations = g_slist_append(icon_locations, g_strdup("/usr/share/icons"));
 	icon_locations = g_slist_append(icon_locations, g_strdup("/usr/share/pixmaps"));
 	icon_locations = g_slist_append(icon_locations, g_strdup("/opt/share/icons"));
 	icon_locations = g_slist_append(icon_locations, g_strdup("/opt/share/pixmaps"));
+
+	icon_locations = slist_remove_duplicates(icon_locations, g_str_equal, g_free);
+
 	return icon_locations;
 }
 

src/tint2conf/properties.c

@@ -2893,10 +2893,10 @@ void create_launcher(GtkWidget *parent)
 
 	fprintf(stderr, "Loading .desktop files\n");
 	GList *entries = NULL;
-	load_desktop_entries("/usr/share/applications", &entries);
-	load_desktop_entries("/usr/local/share/applications", &entries);
-	gchar *path = g_build_filename(g_get_home_dir(), ".local/share/applications", NULL);
-	load_desktop_entries(path, &entries);
+	for (location = get_apps_locations(); location; location = g_slist_next(location)) {
+		const gchar *path = (gchar*) location->data;
+		load_desktop_entries(path, &entries);
+	}
 	entries = g_list_sort(entries, compare_entries);
 	populate_from_entries(entries, FALSE);
 
@@ -2905,8 +2905,6 @@ void create_launcher(GtkWidget *parent)
 	}
 	g_list_free(entries);
 
-	g_free(path);
-
 	icon_theme_changed();
 	load_icons(launcher_apps);
 	load_icons(all_apps);

src/util/common.c

@@ -22,6 +22,7 @@
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
 #include <X11/extensions/Xrender.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -591,3 +592,45 @@ GList *g_list_copy_deep(GList *list, GCopyFunc func, gpointer user_data)
 	return list;
 }
 #endif
+
+GSList *load_locations_from_env(GSList *locations, const char *var, ...)
+{
+	char *value = getenv(var);
+	if (value) {
+		value = strdup(value);
+		char *p = value;
+		for (char *token = strsep(&value, ":"); token; token = strsep(&value, ":")) {
+			va_list ap;
+			va_start(ap, var);
+			for (const char *suffix = va_arg(ap, const char *); suffix; suffix = va_arg(ap, const char *)) {
+				locations = g_slist_append(locations, g_build_filename(token, suffix, NULL));
+			}
+			va_end(ap);
+		}
+		free(p);
+	}
+	return locations;
+}
+
+GSList *slist_remove_duplicates(GSList *list, GCompareFunc eq, GDestroyNotify fr)
+{
+	GSList *new_list = NULL;
+
+	for (GSList *l1 = list; l1; l1 = g_slist_next(l1)) {
+		gboolean duplicate = FALSE;
+		for (GSList *l2 = new_list; l2; l2 = g_slist_next(l2)) {
+			if (eq(l1->data, l2->data)) {
+				duplicate = TRUE;
+				break;
+			}
+		}
+		if (!duplicate) {
+			new_list = g_slist_append(new_list, l1->data);
+			l1->data = NULL;
+		}
+	}
+
+	g_slist_free_full(list, fr);
+
+	return new_list;
+}

src/util/common.h

@@ -96,6 +96,13 @@ void draw_rect(cairo_t *c, double x, double y, double w, double h, double r);
 // Clears the pixmap (with transparent color)
 void clear_pixmap(Pixmap p, int x, int y, int w, int h);
 
+// Appends to the list locations all the directories contained in the environment variable var (split by ":").
+// Optional suffixes are added to each directory. The suffix arguments MUST end with NULL.
+// Returns the new value of the list.
+GSList *load_locations_from_env(GSList *locations, const char *var, ...);
+
+GSList *slist_remove_duplicates(GSList *list, GCompareFunc eq, GDestroyNotify fr);
+
 #define free_and_null(p) { free(p); p = NULL; }
 
 #if !GLIB_CHECK_VERSION (2, 33, 4)