shell: use desktop-shell ini file for screensaver path

Read the same configuration file in the shell plugin (desktop-shell) as
the desktop-shell client does.

Add a new section "screensaver", where "path" defines the path of the
idle animation client to be executed. Not defining "path" disables the
animation.

Idle animations are not in use by default. It must be configured in
wayland-desktop-shell.ini or launched manually.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

compositor/Makefile.am

@@ -74,7 +74,8 @@ endif
 if ENABLE_DESKTOP_SHELL
 desktop_shell = desktop-shell.la
 desktop_shell_la_LDFLAGS = -module -avoid-version
-desktop_shell_la_LIBADD = $(COMPOSITOR_LIBS)
+desktop_shell_la_LIBADD = $(COMPOSITOR_LIBS)	\
+	../shared/libconfig-parser.la
 desktop_shell_la_CFLAGS = $(GCC_CFLAGS)
 desktop_shell_la_SOURCES =			\
 	shell.c					\

compositor/shell.c

@@ -33,6 +33,7 @@
 #include <wayland-server.h>
 #include "compositor.h"
 #include "desktop-shell-server-protocol.h"
+#include "../shared/config-parser.h"
 
 struct shell_surface;
 
@@ -57,6 +58,7 @@ struct wl_shell {
 	struct wl_list panels;
 
 	struct {
+		const char *path;
 		struct wl_resource *binding;
 		struct wl_list surfaces;
 		struct wlsc_process process;
@@ -95,6 +97,28 @@ struct wlsc_move_grab {
 	int32_t dx, dy;
 };
 
+static int
+shell_configuration(struct wl_shell *shell)
+{
+	int ret;
+	char *config_file;
+
+	struct config_key saver_keys[] = {
+		{ "path", CONFIG_KEY_STRING, &shell->screensaver.path },
+	};
+
+	struct config_section cs[] = {
+		{ "screensaver", saver_keys, ARRAY_LENGTH(saver_keys), NULL },
+	};
+
+	config_file = config_file_path("wayland-desktop-shell.ini");
+	ret = parse_config_file(config_file, cs, ARRAY_LENGTH(cs), shell);
+	free(config_file);
+
+	return ret;
+	/* FIXME: free(shell->screensaver.path) on plugin fini */
+}
+
 static void
 move_grab_motion(struct wl_grab *grab,
 		   uint32_t time, int32_t x, int32_t y)
@@ -503,9 +527,12 @@ launch_screensaver(struct wl_shell *shell)
 	if (shell->screensaver.binding)
 		return;
 
+	if (!shell->screensaver.path)
+		return;
+
 	wlsc_client_launch(shell->compositor,
 			   &shell->screensaver.process,
-			   "./clients/wscreensaver",
+			   shell->screensaver.path,
 			   handle_screensaver_sigchld);
 }
 
@@ -1214,6 +1241,9 @@ shell_init(struct wlsc_compositor *ec)
 	wl_list_init(&shell->panels);
 	wl_list_init(&shell->screensaver.surfaces);
 
+	if (shell_configuration(shell) < 0)
+		return -1;
+
 	if (wl_display_add_global(ec->wl_display, &wl_shell_interface,
 				  shell, bind_shell) == NULL)
 		return -1;

wayland-desktop-shell.ini

@@ -18,3 +18,7 @@ path=/usr/bin/google-chrome
 [launcher]
 icon=/usr/share/icons/gnome/24x24/apps/arts.png
 path=./clients/flower
+
+[screensaver]
+#path=./clients/wscreensaver
+