tz-launcher: support signal to reload launchers at runtime

When sent a SIGUSR1 signal ("$ kill -10 $PID"), tz-launcher will
now re-read the content of the files/folders which have been passed
to it, and display the corresponding new launchers.

Change-Id: I29d7a5f2d9d63132189da50e08dd1860af849bb6
Signed-off-by: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>

2 files changed, 44 insertions, 13 deletions

diff --git a/tz-launcher/tz-launcher-wl.c b/tz-launcher/tz-launcher-wl.c
index c990423..5c32ae5 100644
--- a/tz-launcher/tz-launcher-wl.c
+++ b/tz-launcher/tz-launcher-wl.c
@@ -32,6 +32,7 @@ struct launcher {
 	gboolean terminal;
 };
 
+struct display *display;
 struct main_window *main_window;
 
 
@@ -452,9 +453,16 @@ main_window_destroy ()
 }
 
 void
+tz_launcher_wl_reload (int desktopfiles, gchar ***desktoptable)
+{
+	main_window_destroy ();
+	main_window_create (display, desktopfiles, desktoptable);
+}
+
+void
 tz_launcher_wl_run (int desktopfiles, gchar ***desktoptable)
 {
-	struct display *display = NULL;
+	display = NULL;
 	int retries = 0;
 
 	while (!display) {
diff --git a/tz-launcher/tz-launcher.c b/tz-launcher/tz-launcher.c
index f57618b..7a50fc2 100644
--- a/tz-launcher/tz-launcher.c
+++ b/tz-launcher/tz-launcher.c
@@ -8,6 +8,9 @@
 int desktopfiles;
 gchar **desktoptable[MAX_DESKTOPFILES];
 
+int global_argc;
+char **global_argv;
+
 
 gboolean
 file_is_parsable (GFile *file)
@@ -200,21 +203,12 @@ tz_launcher_parse_config_file (GFile *file)
 }
 
 
-int
-main (int argc, char *argv[])
+void
+parse_args (int argc, char **argv)
 {
-	if (argc < 2) {
-		g_print ("Usage : tz-launcher <file1>.desktop <file2>.desktop <directory>...\n"
-                         "         or\n"
-                         "        tz-launcher -c <list-of-.desktop-files>.conf\n");
-		return 0;
-	}
-
-	desktopfiles = 0;
-	g_type_init ();
-
 
 	int i;
+	desktopfiles = 0;
 	GFile *desktopfile;
 
 	for (i = 1; i < argc ; i++) {
@@ -257,7 +251,36 @@ main (int argc, char *argv[])
 		if (desktopfiles == MAX_DESKTOPFILES)
 			break;
 	}
+}
+
+static void
+sigreload_handler (int s)
+{
+	parse_args (global_argc, global_argv);
+
+	if (desktopfiles > 0)
+		tz_launcher_wl_reload (desktopfiles, desktoptable);
+}
+
+int
+main (int argc, char **argv)
+{
+	if (argc < 2) {
+		g_print ("Usage : tz-launcher <file1>.desktop <file2>.desktop <directory>...\n"
+                         "         or\n"
+                         "        tz-launcher -c <list-of-.desktop-files>.conf\n");
+		return 0;
+	}
+
+	g_type_init ();
+
+
+	signal (SIGUSR1, sigreload_handler);
+	global_argc = argc;
+	global_argv = argv;
+
 
+	parse_args (argc, argv);
 
 	if (desktopfiles > 0)
 		tz_launcher_wl_run (desktopfiles, desktoptable);