[gnome-shell] extensions-tool: Implement enable/disable commands

[Florian Müllner <fmuellner src gnome org>]

commit c8c93b2a708ca4fb42b77ffb7beac68d190bc023
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Aug 26 21:37:07 2018 +0200

    extensions-tool: Implement enable/disable commands
    
    This replicates the most basic functionality of the existing
    gnome-shell-extension-tool, albeit using a git/gio/gsettings
    style command interface rather than plain options; this will
    allow us to implement more complex commands that have options
    on their own in the future.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1234

 src/extensions-tool/command-disable.c | 105 ++++++++++++++++++++++++++++++++++
 src/extensions-tool/command-enable.c  | 104 +++++++++++++++++++++++++++++++++
 src/extensions-tool/commands.h        |  30 ++++++++++
 src/extensions-tool/common.h          |  32 +++++++++++
 src/extensions-tool/main.c            |  37 ++++++++++++
 src/extensions-tool/meson-src.build   |   9 ++-
 src/extensions-tool/meson.build       |   8 ++-
 7 files changed, 323 insertions(+), 2 deletions(-)
---
diff --git a/src/extensions-tool/command-disable.c b/src/extensions-tool/command-disable.c
new file mode 100644
index 0000000000..e578959abe
--- /dev/null
+++ b/src/extensions-tool/command-disable.c
@@ -0,0 +1,105 @@
+/* command-disable.c
+ *
+ * Copyright 2018 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
+disable_extension (const char *uuid)
+{
+  g_autoptr(GSettings) settings = get_shell_settings ();
+  g_auto(GStrv) extensions = NULL;
+  g_auto(GStrv) new_value = NULL;
+  const char **s;
+  guint n_extensions;
+  int i;
+
+  if (settings == NULL)
+    return FALSE;
+
+  if (!g_settings_is_writable (settings, "enabled-extensions"))
+    return FALSE;
+
+  extensions = g_settings_get_strv (settings, "enabled-extensions");
+
+  if (!g_strv_contains ((const char **)extensions, uuid))
+    return TRUE;
+
+  n_extensions = g_strv_length (extensions);
+  new_value = g_new0 (char *, n_extensions);
+  for (i = 0, s = (const char **)extensions; i < n_extensions; i++, s++)
+    if (!g_str_equal (*s, uuid))
+      new_value[i] = g_strdup (*s);
+
+  g_settings_set_strv (settings, "enabled-extensions", (const char **)new_value);
+  g_settings_sync ();
+
+  return TRUE;
+}
+
+int
+handle_disable (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 disable");
+
+  context = g_option_context_new (NULL);
+  g_option_context_set_help_enabled (context, FALSE);
+  g_option_context_set_summary (context, _("Disable 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 disable_extension (*uuids) ? 0 : 2;
+}
diff --git a/src/extensions-tool/command-enable.c b/src/extensions-tool/command-enable.c
new file mode 100644
index 0000000000..25b3e92309
--- /dev/null
+++ b/src/extensions-tool/command-enable.c
@@ -0,0 +1,104 @@
+/* command-enable.c
+ *
+ * Copyright 2018 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
+enable_extension (const char *uuid)
+{
+  g_autoptr(GSettings) settings = get_shell_settings ();
+  g_auto(GStrv) extensions = NULL;
+  g_auto(GStrv) new_value = NULL;
+  guint n_extensions;
+  int i;
+
+  if (settings == NULL)
+    return FALSE;
+
+  if (!g_settings_is_writable (settings, "enabled-extensions"))
+    return FALSE;
+
+  extensions = g_settings_get_strv (settings, "enabled-extensions");
+
+  if (g_strv_contains ((const char **)extensions, uuid))
+    return TRUE;
+
+  n_extensions = g_strv_length (extensions);
+  new_value = g_new0 (char *, n_extensions + 2);
+  for (i = 0; i < n_extensions; i++)
+    new_value[i] = g_strdup (extensions[i]);
+  new_value[i] = g_strdup (uuid);
+
+  g_settings_set_strv (settings, "enabled-extensions", (const char **)new_value);
+  g_settings_sync ();
+
+  return TRUE;
+}
+
+int
+handle_enable (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 enable");
+
+  context = g_option_context_new (NULL);
+  g_option_context_set_help_enabled (context, FALSE);
+  g_option_context_set_summary (context, _("Enable 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 enable_extension (*uuids) ? 0 : 2;
+}
diff --git a/src/extensions-tool/commands.h b/src/extensions-tool/commands.h
new file mode 100644
index 0000000000..c0b0ba18cc
--- /dev/null
+++ b/src/extensions-tool/commands.h
@@ -0,0 +1,30 @@
+/* commands.h
+ *
+ * Copyright 2018 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
+ */
+
+#pragma once
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+int handle_enable     (int argc, char *argv[], gboolean do_help);
+int handle_disable    (int argc, char *argv[], gboolean do_help);
+
+G_END_DECLS
diff --git a/src/extensions-tool/common.h b/src/extensions-tool/common.h
new file mode 100644
index 0000000000..c3a243c929
--- /dev/null
+++ b/src/extensions-tool/common.h
@@ -0,0 +1,32 @@
+/* common.h
+ *
+ * Copyright 2018 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
+ */
+
+#pragma once
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+void show_help (GOptionContext *context,
+                const char     *message);
+
+GSettings  *get_shell_settings (void);
+
+G_END_DECLS
diff --git a/src/extensions-tool/main.c b/src/extensions-tool/main.c
index dfc6e86a0f..81c72a3ac0 100644
--- a/src/extensions-tool/main.c
+++ b/src/extensions-tool/main.c
@@ -23,6 +23,37 @@
 #include <locale.h>
 
 #include "config.h"
+#include "commands.h"
+#include "common.h"
+
+void
+show_help (GOptionContext *context, const char *message)
+{
+  g_autofree char *help = NULL;
+
+  if (message)
+    g_printerr ("gnome-extensions: %s\n\n", message);
+
+  help = g_option_context_get_help (context, TRUE, NULL);
+  g_printerr ("%s", help);
+}
+
+GSettings *
+get_shell_settings (void)
+{
+  g_autoptr (GSettingsSchema) schema = NULL;
+  GSettingsSchemaSource *schema_source;
+
+  schema_source = g_settings_schema_source_get_default ();
+  schema = g_settings_schema_source_lookup (schema_source,
+                                            "org.gnome.shell",
+                                            TRUE);
+
+  if (schema == NULL)
+    return NULL;
+
+  return g_settings_new_full (schema, NULL, NULL);
+}
 
 static int
 handle_version (int argc, char *argv[], gboolean do_help)
@@ -54,6 +85,8 @@ usage (void)
   g_printerr ("%s\n", _("Commands:"));
   g_printerr ("  help      %s\n", _("Print help"));
   g_printerr ("  version   %s\n", _("Print version"));
+  g_printerr ("  enable    %s\n", _("Enable extension"));
+  g_printerr ("  disable   %s\n", _("Disable extension"));
   g_printerr ("\n");
   g_printerr (_("Use %s to get detailed help.\n"), "“gnome-extensions help COMMAND”");
 }
@@ -107,6 +140,10 @@ main (int argc, char *argv[])
 
   if (g_str_equal (command, "version"))
     return handle_version (argc, argv, do_help);
+  else if (g_str_equal (command, "enable"))
+    return handle_enable (argc, argv, do_help);
+  else if (g_str_equal (command, "disable"))
+    return handle_disable (argc, argv, do_help);
   else
     usage ();
 
diff --git a/src/extensions-tool/meson-src.build b/src/extensions-tool/meson-src.build
index f2209444ee..fb3ab04d17 100644
--- a/src/extensions-tool/meson-src.build
+++ b/src/extensions-tool/meson-src.build
@@ -1,5 +1,12 @@
+sources = [
+  'commands.h',
+  'command-disable.c',
+  'command-enable.c',
+  'common.h',
+  'main.c'
+]
 executable('gnome-extensions',
-  'main.c',
+  sources,
   dependencies: gio_dep,
   install: true
 )
diff --git a/src/extensions-tool/meson.build b/src/extensions-tool/meson.build
index 30dc241e1e..2e03539c4b 100644
--- a/src/extensions-tool/meson.build
+++ b/src/extensions-tool/meson.build
@@ -8,8 +8,14 @@ configure_file(
   configuration: config_h,
 )
 
+sources = [
+  'command-disable.c',
+  'command-enable.c',
+  'main.c'
+]
+
 executable('gnome-extensions',
-  'main.c',
+  sources,
   dependencies: gio_dep,
   install: true
 )