GDesktopAppInfo: add enough api to make autostart implementable

gnome-session still uses EggDesktopFile, since GDesktopAppInfo is
missing a handful of APIs that are needed to implement the
autostart spec. This patch adds the minimum that is required.

https://bugzilla.gnome.org/show_bug.cgi?id=688497

gio/gdesktopappinfo.c

@@ -92,6 +92,8 @@ struct _GDesktopAppInfo
   char *desktop_id;
   char *filename;
 
+  GKeyFile *keyfile;
+
   char *name;
   char *generic_name;
   char *fullname;
@@ -171,6 +173,10 @@ g_desktop_app_info_finalize (GObject *object)
 
   g_free (info->desktop_id);
   g_free (info->filename);
+
+  if (info->keyfile)
+    g_key_file_unref (info->keyfile);
+
   g_free (info->name);
   g_free (info->generic_name);
   g_free (info->fullname);
@@ -213,10 +219,10 @@ g_desktop_app_info_set_property(GObject         *object,
 }
 
 static void
-g_desktop_app_info_get_property(GObject         *object,
-				guint            prop_id,
-				GValue          *value,
-				GParamSpec      *pspec)
+g_desktop_app_info_get_property (GObject    *object,
+                                 guint       prop_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
 {
   GDesktopAppInfo *self = G_DESKTOP_APP_INFO (object);
 
@@ -371,6 +377,8 @@ g_desktop_app_info_load_from_keyfile (GDesktopAppInfo *info,
       info->path = NULL;
     }
 
+  info->keyfile = g_key_file_ref (key_file);
+
   return TRUE;
 }
 
@@ -392,7 +400,7 @@ g_desktop_app_info_load_file (GDesktopAppInfo *self)
       retval = g_desktop_app_info_load_from_keyfile (self, key_file);
     }
 
-  g_key_file_free (key_file);
+  g_key_file_unref (key_file);
   return retval;
 }
 
@@ -527,6 +535,9 @@ g_desktop_app_info_dup (GAppInfo *appinfo)
   new_info->filename = g_strdup (info->filename);
   new_info->desktop_id = g_strdup (info->desktop_id);
 
+  if (info->keyfile)
+    new_info->keyfile = g_key_file_ref (info->keyfile);
+
   new_info->name = g_strdup (info->name);
   new_info->generic_name = g_strdup (info->generic_name);
   new_info->fullname = g_strdup (info->fullname);
@@ -3443,3 +3454,73 @@ g_desktop_app_info_get_startup_wm_class (GDesktopAppInfo *info)
 
   return info->startup_wm_class;
 }
+
+/**
+ * g_desktop_app_info_get_string:
+ * @info: a #GDesktopAppInfo
+ * @key: the key to look up
+ *
+ * Looks up a string value in the keyfile backing @info.
+ *
+ * The @key is looked up in the "Desktop Entry" group.
+ *
+ * Returns: a newly allocated string, or %NULL if the key
+ *     is not found
+ *
+ * Since: 2.36
+ */
+char *
+g_desktop_app_info_get_string (GDesktopAppInfo *info,
+                               const char      *key)
+{
+  g_return_val_if_fail (G_IS_DESKTOP_APP_INFO (info), NULL);
+
+  return g_key_file_get_string (info->keyfile,
+                                G_KEY_FILE_DESKTOP_GROUP, key, NULL);
+}
+
+/**
+ * g_desktop_app_info_get_boolean:
+ * @info: a #GDesktopAppInfo
+ * @key: the key to look up
+ *
+ * Looks up a boolean value in the keyfile backing @info.
+ *
+ * The @key is looked up in the "Desktop Entry" group.
+ *
+ * Returns: the boolean value, or %FALSE if the key
+ *     is not found
+ *
+ * Since: 2.36
+ */
+gboolean
+g_desktop_app_info_get_boolean (GDesktopAppInfo *info,
+                                const char      *key)
+{
+  g_return_val_if_fail (G_IS_DESKTOP_APP_INFO (info), FALSE);
+
+  return g_key_file_get_boolean (info->keyfile,
+                                 G_KEY_FILE_DESKTOP_GROUP, key, NULL);
+}
+
+/**
+ * g_desktop_app_info_has_key:
+ * @info: a #GDesktopAppInfo
+ * @key: the key to look up
+ *
+ * Returns whether @key exists in the "Desktop Entry" group
+ * of the keyfile backing @info.
+ *
+ * Returns: %TRUE if the @key exists
+ *
+ * Since: 2.26
+ */
+gboolean
+g_desktop_app_info_has_key (GDesktopAppInfo *info,
+                            const char      *key)
+{
+  g_return_val_if_fail (G_IS_DESKTOP_APP_INFO (info), FALSE);
+
+  return g_key_file_has_key (info->keyfile,
+                             G_KEY_FILE_DESKTOP_GROUP, key, NULL);
+}

gio/gdesktopappinfo.h

@@ -64,6 +64,15 @@ gboolean         g_desktop_app_info_get_is_hidden     (GDesktopAppInfo *info);
 
 void             g_desktop_app_info_set_desktop_env   (const char      *desktop_env);
 
+GLIB_AVAILABLE_IN_2_36
+gboolean         g_desktop_app_info_has_key           (GDesktopAppInfo *info,
+                                                       const char      *key);
+GLIB_AVAILABLE_IN_2_36
+char *           g_desktop_app_info_get_string        (GDesktopAppInfo *info,
+                                                       const char      *key);
+GLIB_AVAILABLE_IN_2_36
+gboolean         g_desktop_app_info_get_boolean       (GDesktopAppInfo *info,
+                                                       const char      *key);
 
 #ifndef G_DISABLE_DEPRECATED