Implement -i, --inactivity-reset command line option

The use case is kiosk systems where leaving the application
idle for a period of time means that the user left, and the
session is reset so the next user starts off clean.

The implementation uses libXss and uses XScreenSaverQueryExtension
which means it is for now supported on X11 only.

Right now reset means closing any opens web pages and opening
the original web page.

Currently --inactivity-reset is only supported with --app.

midori/main.c

@@ -54,6 +54,13 @@
     #define BOOKMARK_FILE "bookmarks.xbel"
 #endif
 
+#ifdef GDK_WINDOWING_X11
+    #include <X11/Xlib.h>
+    #include <X11/Xutil.h>
+    #include <X11/extensions/scrnsaver.h>
+    #include <gdk/gdkx.h>
+#endif
+
 static gchar*
 build_config_filename (const gchar* filename)
 {
@@ -1422,6 +1429,71 @@ signal_handler (int signal_id)
 }
 #endif
 
+typedef struct {
+     MidoriBrowser* browser;
+     guint timeout;
+     gchar* uri;
+} MidoriInactivityTimeout;
+
+static gboolean
+midori_inactivity_timeout (gpointer data)
+{
+    #ifdef GDK_WINDOWING_X11
+    MidoriInactivityTimeout* mit = data;
+    static Display* xdisplay = NULL;
+    static XScreenSaverInfo* mit_info = NULL;
+    static int has_extension = -1;
+    int event_base, error_base;
+
+    if (has_extension == -1)
+    {
+        GdkDisplay* display = gtk_widget_get_display (GTK_WIDGET (mit->browser));
+        xdisplay = GDK_DISPLAY_XDISPLAY (display);
+        has_extension = XScreenSaverQueryExtension (xdisplay,
+                                                    &event_base, &error_base);
+    }
+
+    if (has_extension)
+    {
+        if (!mit_info)
+            mit_info = XScreenSaverAllocInfo ();
+
+        XScreenSaverQueryInfo (xdisplay, RootWindow (xdisplay, 0), mit_info);
+        if (mit_info->idle / 1000 > mit->timeout)
+        {
+            guint i = 0;
+            GtkWidget* view;
+
+            while ((view = midori_browser_get_nth_tab (mit->browser, i++)))
+                gtk_widget_destroy (view);
+            midori_browser_set_current_uri (mit->browser, mit->uri);
+            /* TODO: Re-run initial commands */
+
+        }
+    }
+    #else
+    /* TODO: Implement for other windowing systems */
+    #endif
+
+    return TRUE;
+}
+
+static void
+midori_setup_inactivity_reset (MidoriBrowser* browser,
+                               gint           inactivity_reset,
+                               const gchar*   uri)
+{
+    if (inactivity_reset > 0)
+    {
+        MidoriInactivityTimeout* mit = g_new (MidoriInactivityTimeout, 1);
+        mit->browser = browser;
+        mit->timeout = inactivity_reset;
+        mit->uri = g_strdup (uri);
+        g_timeout_add_seconds (inactivity_reset, midori_inactivity_timeout,
+                               mit);
+    }
+}
+
 int
 main (int    argc,
       char** argv)
@@ -1434,6 +1506,7 @@ main (int    argc,
     gboolean execute;
     gboolean version;
     gchar** uris;
+    gint inactivity_reset;
     MidoriApp* app;
     gboolean result;
     GError* error;
@@ -1459,6 +1532,10 @@ main (int    argc,
        N_("Display program version"), NULL },
        { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &uris,
        N_("Addresses"), NULL },
+       #ifdef GDK_WINDOWING_X11
+       { "inactivity-reset", 'i', 0, G_OPTION_ARG_INT, &inactivity_reset,
+       N_("Reset Midori after SECONDS seconds of inactivity"), N_("SECONDS") },
+       #endif
      { NULL }
     };
     GString* error_messages;
@@ -1534,6 +1611,7 @@ main (int    argc,
     execute = FALSE;
     version = FALSE;
     uris = NULL;
+    inactivity_reset = 0;
     error = NULL;
     if (!gtk_init_with_args (&argc, &argv, _("[Addresses]"), entries,
                              GETTEXT_PACKAGE, &error))
@@ -1642,11 +1720,16 @@ main (int    argc,
                 i++;
             }
         }
+        midori_setup_inactivity_reset (browser, inactivity_reset, webapp);
         midori_startup_timer ("App created: \t%f");
         gtk_main ();
         return 0;
     }
 
+    /* FIXME: Inactivity reset is only supported for app mode */
+    if (inactivity_reset > 0)
+        g_error ("--inactivity-reset is currently only supported with --app.");
+
     /* Standalone javascript support */
     if (run)
         return midori_run_script (uris ? *uris : NULL);

midori/wscript_build

@@ -6,7 +6,7 @@ import platform
 
 progressive = True
 libs = 'M UNIQUE LIBSOUP GMODULE GTHREAD LIBIDN GIO GTK SQLITE ' \
-       'LIBNOTIFY WEBKIT LIBXML X11 WS2_32 OPENSSL HILDON HILDON_FM'
+       'LIBNOTIFY WEBKIT LIBXML X11 XSS WS2_32 OPENSSL HILDON HILDON_FM'
 
 if progressive or Options.commands['check']:
     obj = bld.new_task_gen ('cc', 'staticlib')

wscript

@@ -209,6 +209,7 @@ def configure (conf):
         args = '--define-variable=target=win32'
     elif sys.platform != 'darwin':
         check_pkg ('x11')
+        conf.check (lib='Xss', mandatory=True)
     check_pkg ('gtk+-2.0', '2.10.0', var='GTK', args=args)
     check_pkg ('webkit-1.0', '1.1.1', args=args)
     check_pkg ('libsoup-2.4', '2.25.2')