extensions-tool: Add 'reset' command

Now that we allow to disable session mode extensions, it can be useful
to reset an extension to its original state, that is disabled in the
regular session, but possibly enabled via the session mode.

Add a corresponding command.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/1234

src/extensions-tool/command-reset.c

@@ -0,0 +1,84 @@
+/* command-reset.c
+ *
+ * Copyright 2019 Florian Müllner <fmuellner@gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <glib/gi18n.h>
+#include <gio/gio.h>
+
+#include "commands.h"
+#include "common.h"
+#include "config.h"
+
+static gboolean
+reset_extension (const char *uuid)
+{
+  g_autoptr(GSettings) settings = get_shell_settings();
+
+  if (settings == NULL)
+    return FALSE;
+
+  return settings_list_remove (settings, "enabled-extensions", uuid) &&
+         settings_list_remove (settings, "disabled-extensions", uuid);
+}
+
+int
+handle_reset (int argc, char *argv[], gboolean do_help)
+{
+  g_autoptr (GOptionContext) context = NULL;
+  g_autoptr (GError) error = NULL;
+  g_auto(GStrv) uuids = NULL;
+  GOptionEntry entries[] = {
+    { .long_name = G_OPTION_REMAINING,
+      .arg_description = "UUID",
+      .arg = G_OPTION_ARG_STRING_ARRAY, .arg_data = &uuids },
+    { NULL }
+  };
+
+  g_set_prgname ("gnome-extensions reset");
+
+  context = g_option_context_new (NULL);
+  g_option_context_set_help_enabled (context, FALSE);
+  g_option_context_set_summary (context, _("Reset an extension"));
+  g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
+
+  if (do_help)
+    {
+      show_help (context, NULL);
+      return 0;
+    }
+
+  if (!g_option_context_parse (context, &argc, &argv, &error))
+    {
+      show_help (context, error->message);
+      return 1;
+    }
+
+  if (uuids == NULL)
+    {
+      show_help (context, _("No UUID given"));
+      return 1;
+    }
+  else if (g_strv_length (uuids) > 1)
+    {
+      show_help (context, _("More than one UUID given"));
+      return 1;
+    }
+
+  return reset_extension (*uuids) ? 0 : 2;
+}

src/extensions-tool/commands.h

@@ -26,6 +26,7 @@ G_BEGIN_DECLS
 
 int handle_enable     (int argc, char *argv[], gboolean do_help);
 int handle_disable    (int argc, char *argv[], gboolean do_help);
+int handle_reset      (int argc, char *argv[], gboolean do_help);
 int handle_list       (int argc, char *argv[], gboolean do_help);
 int handle_info       (int argc, char *argv[], gboolean do_help);
 int handle_prefs      (int argc, char *argv[], gboolean do_help);

src/extensions-tool/completion/bash/gnome-extensions

@@ -5,7 +5,7 @@
 ################################################################################
 
 __gnome_extensions() {
-  local commands="version enable disable info install show list create pack prefs uninstall"
+  local commands="version enable disable reset info install show list create pack prefs uninstall"
   local COMMAND=${COMP_WORDS[1]}
 
   _init_completion -s || return
@@ -35,7 +35,7 @@ __gnome_extensions() {
         uninstall)
           local list_opt=--user
           ;;&
-        enable|disable|info|show|prefs|uninstall)
+        enable|disable|info|show|prefs|reset|uninstall)
           COMPREPLY=($(compgen -W "`gnome-extensions list $list_opt`" -- "$2"))
           return 0
           ;;

src/extensions-tool/main.c

@@ -244,6 +244,7 @@ usage (void)
   g_printerr ("  version   %s\n", _("Print version"));
   g_printerr ("  enable    %s\n", _("Enable extension"));
   g_printerr ("  disable   %s\n", _("Disable extension"));
+  g_printerr ("  reset     %s\n", _("Reset extension"));
   g_printerr ("  uninstall %s\n", _("Uninstall extension"));
   g_printerr ("  list      %s\n", _("List extensions"));
   g_printerr ("  info      %s\n", _("Show extension info"));
@@ -309,6 +310,8 @@ main (int argc, char *argv[])
     return handle_enable (argc, argv, do_help);
   else if (g_str_equal (command, "disable"))
     return handle_disable (argc, argv, do_help);
+  else if (g_str_equal (command, "reset"))
+    return handle_reset (argc, argv, do_help);
   else if (g_str_equal (command, "list"))
     return handle_list (argc, argv, do_help);
   else if (g_str_equal (command, "info"))

src/extensions-tool/man/gnome-extensions.txt

@@ -19,6 +19,8 @@ SYNOPSIS
 
 *gnome-extensions* disable 'UUID'
 
+*gnome-extensions* reset 'UUID'
+
 *gnome-extensions* info 'UUID'
 
 *gnome-extensions* show 'UUID'
@@ -62,6 +64,12 @@ Disables the extension identified by 'UUID'.
 +
 If the extension is not enabled, the command will do nothing.
 
+*reset* 'UUID'::
+Reset the extension identified by 'UUID'.
++
+The extension will be disabled in GNOME, but may be enabled by other sessions
+like GNOME Classic.
+
 *info* 'UUID'::
 Show details of the extension identified by 'UUID', including name,
 description and state.

src/extensions-tool/meson.build

@@ -17,6 +17,7 @@ sources = [
   'command-list.c',
   'command-pack.c',
   'command-prefs.c',
+  'command-reset.c',
   'command-uninstall.c',
   'main.c'
 ]