feedback-manager: Search for default theme under XDG_CONFIG_HOME first

This would allow users to create their own feedback profiles
without editing system files or using root privileges

Signed-off-by: Pablo Correa Gómez <ablocorrea@hotmail.com>

README.md

@@ -84,7 +84,10 @@ You can add your own themes in one of two ways:
 
 1. By exporting an environment variable `FEEDBACK_THEME` with a path to a
    valid theme file (not recommended, use for testing only), or
-2. By adding your theme file to one of the folders in the `XDG_DATA_DIRS`
+2. By creating a theme file under `$XDG_CONFIG_HOME/feedbackd/themes/default.json`.
+   If `XDG_CONFIG_HOME` environment variable is not set or empty, it will
+   default to `$HOME/.config`, or
+3. By adding your theme file to one of the folders in the `XDG_DATA_DIRS`
    environment variable, appended with `feedbackd/themes/`. This folder isn't
    created automatically, so you have to create it yourself. Here's an example:
    ```bash

src/fbd-feedback-manager.c

@@ -437,9 +437,18 @@ find_themefile (void)
   const gchar *comp;
 
   g_autoptr (GError) err = NULL;
+  g_autofree gchar *user_config_path = NULL;
   gchar **xdg_data_dirs = (gchar **) g_get_system_data_dirs ();
   g_autofree gchar *compatibles = NULL;
 
+  // First look for a default file under $XDG_DATA_HOME
+  user_config_path = g_build_filename (g_get_user_config_dir (), "feedbackd",
+                                       "themes", "default.json", NULL);
+  if (g_file_test (user_config_path, (G_FILE_TEST_EXISTS))) {
+    g_debug ("Found user themefile at: %s", user_config_path);
+    return g_steal_pointer (&user_config_path);
+  }
+
   // Try to read the device name
   if (g_file_test (DEVICE_TREE_PATH, (G_FILE_TEST_EXISTS))) {
     g_debug ("Found device tree device compatible at %s", DEVICE_TREE_PATH);
@@ -465,7 +474,7 @@ find_themefile (void)
         // Check if file exist
         if (g_file_test (config_path, (G_FILE_TEST_EXISTS))) {
           g_debug ("Found themefile for this device at: %s", config_path);
-          return g_strdup (config_path);
+          return g_steal_pointer (&config_path);
         }
       }