From fa7a7671b37b92059e3e75d8b495575468ff7a9e Mon Sep 17 00:00:00 2001
From: Matthew Brush <matt@xfce.org>
Date: Mon, 18 Jul 2016 17:02:13 -0700
Subject: [PATCH] Tasklist: Add "Start New Instance" item to button menu.

Works on at least Linux where `/proc/<pid>/exe` is a symlink to
the running executable. Could be adapted to other plaforms by using
their version of that symlink. If not supported, the "Start New Instance"
item is not added to the menu.
---
 plugins/tasklist/tasklist-widget.c | 64 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/plugins/tasklist/tasklist-widget.c b/plugins/tasklist/tasklist-widget.c
index 53174a9..82f7d08 100644
--- a/plugins/tasklist/tasklist-widget.c
+++ b/plugins/tasklist/tasklist-widget.c
@@ -2705,6 +2705,50 @@ xfce_tasklist_button_enter_notify_event (GtkWidget         *button,
 
 
 
+static void
+xfce_tasklist_button_start_new_instance_clicked (GtkMenuItem       *item,
+                                                 XfceTasklistChild *child)
+{
+  GError *error = NULL;
+  const gchar *path = g_object_get_data (G_OBJECT (item), "exe-path");
+  if (!g_spawn_command_line_async (path, &error))
+    {
+      GtkWidget *dialog =
+        gtk_message_dialog_new (NULL,
+                                0,
+                                GTK_MESSAGE_ERROR,
+                                GTK_BUTTONS_OK,
+                                _("Unable to start new instance of '%s'"),
+                                path);
+      gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
+                                                "%s", error->message);
+      gtk_window_set_title (GTK_WINDOW (dialog), _("Error"));
+      g_error_free (error);
+      gtk_dialog_run (GTK_DIALOG (dialog));
+      gtk_widget_destroy (dialog);
+    }
+}
+
+
+
+static gchar *
+xfce_tasklist_button_get_child_path (XfceTasklistChild *child)
+{
+  gchar *path = NULL;
+  WnckApplication *app = wnck_window_get_application (child->window);
+  int pid = wnck_application_get_pid (app);
+  if (pid > 0)
+    {
+      gchar *link = g_strdup_printf ("/proc/%d/exe", pid);
+      if (g_file_test (link, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_SYMLINK))
+        path = g_file_read_link (link, NULL);
+      g_free (link);
+    }
+  return path;
+}
+
+
+
 static gboolean
 xfce_tasklist_button_button_press_event (GtkWidget         *button,
                                          GdkEventButton    *event,
@@ -2732,10 +2776,30 @@ xfce_tasklist_button_button_press_event (GtkWidget         *button,
 
   if (event->button == 3)
     {
+      gchar *path;
+
       menu = wnck_action_menu_new (child->window);
       g_signal_connect (G_OBJECT (menu), "selection-done",
           G_CALLBACK (gtk_widget_destroy), NULL);
 
+      /* add "Start new Instance" item to menu if supported by the platform */
+      path = xfce_tasklist_button_get_child_path (child);
+      if (path != NULL)
+        {
+          GtkWidget *item;
+          item = gtk_separator_menu_item_new ();
+          gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
+          gtk_widget_show (item);
+          item = gtk_menu_item_new_with_label (_("Start New Instance..."));
+          g_object_set_data_full (G_OBJECT (item), "exe-path", path, g_free);
+          gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
+          gtk_widget_show (item);
+          g_signal_connect (item,
+                            "activate",
+                            G_CALLBACK (xfce_tasklist_button_start_new_instance_clicked),
+                            child);
+        }
+
       gtk_menu_attach_to_widget (GTK_MENU (menu), button, NULL);
       gtk_menu_popup (GTK_MENU (menu), NULL, NULL,
                       child->type == CHILD_TYPE_WINDOW ? xfce_panel_plugin_position_menu : NULL,
-- 
2.7.4