extensions-tool: Split out settings_list_add/remove helpers

With the addition of the 'disabled-extensions' key in commit ce1bee727,
the way extensions are enabled/disabled changed: Now a UUID is always
added to one list and removed from another.

Prepare for that by generalizing the relevant bits of the existing
enable/disable commands as helper functions.

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

src/extensions-tool/command-disable.c

@@ -29,33 +29,11 @@ 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 settings_list_remove (settings, "enabled-extensions", uuid);
-    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

src/extensions-tool/command-enable.c

@@ -29,32 +29,11 @@ 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 settings_list_add (settings, "enabled-extensions", uuid);
-    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

src/extensions-tool/common.h

@@ -54,6 +54,13 @@ void print_extension_info (GVariantDict  *info,
 GDBusProxy *get_shell_proxy (GError **error);
 GSettings  *get_shell_settings (void);
 
+gboolean settings_list_add (GSettings  *settings,
+                            const char *key,
+                            const char *value);
+gboolean settings_list_remove (GSettings  *settings,
+                               const char *key,
+                               const char *value);
+
 gboolean file_delete_recursively (GFile   *file,
                                   GError **error);
 

src/extensions-tool/main.c

@@ -91,6 +91,67 @@ get_shell_settings (void)
   return g_settings_new_full (schema, NULL, NULL);
 }
 
+gboolean
+settings_list_add (GSettings  *settings,
+                   const char *key,
+                   const char *value)
+{
+  g_auto(GStrv) list = NULL;
+  g_auto(GStrv) new_value = NULL;
+  guint n_values;
+  int i;
+
+  if (!g_settings_is_writable (settings, key))
+    return FALSE;
+
+  list = g_settings_get_strv (settings, key);
+
+  if (g_strv_contains ((const char **)list, value))
+    return TRUE;
+
+  n_values = g_strv_length (list);
+  new_value = g_new0 (char *, n_values + 2);
+  for (i = 0; i < n_values; i++)
+    new_value[i] = g_strdup (list[i]);
+  new_value[i] = g_strdup (value);
+
+  g_settings_set_strv (settings, key, (const char **)new_value);
+  g_settings_sync ();
+
+  return TRUE;
+}
+
+gboolean
+settings_list_remove (GSettings  *settings,
+                      const char *key,
+                      const char *value)
+{
+  g_auto(GStrv) list = NULL;
+  g_auto(GStrv) new_value = NULL;
+  const char **s;
+  guint n_values;
+  int i;
+
+  if (!g_settings_is_writable (settings, key))
+    return FALSE;
+
+  list = g_settings_get_strv (settings, key);
+
+  if (!g_strv_contains ((const char **)list, value))
+    return TRUE;
+
+  n_values = g_strv_length (list);
+  new_value = g_new0 (char *, n_values);
+  for (i = 0, s = (const char **)list; i < n_values; i++, s++)
+    if (!g_str_equal (*s, value))
+      new_value[i] = g_strdup (*s);
+
+  g_settings_set_strv (settings, key, (const char **)new_value);
+  g_settings_sync ();
+
+  return TRUE;
+}
+
 void
 print_extension_info (GVariantDict  *info,
                       DisplayFormat  format)