[glib] GAppInfo: add a mechanism to query supported content types

[Giovanni Campagna <gcampagna src gnome org>]

commit 0417ddab6fbd2f1cddbb9218e0e300e04da2eda5
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sat Apr 14 19:34:00 2012 +0200

    GAppInfo: add a mechanism to query supported content types
    
    This essentially adds an accessor for the MimeType field in desktop files,
    to retrieve the list of all mime types supported by an application.
    The interface though is part of GAppInfo, so it could be implemented
    in the future by other backends.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=674111

 docs/reference/gio/gio-sections.txt |    1 +
 gio/gappinfo.c                      |   31 +++++++++++++++++++++++++++++++
 gio/gappinfo.h                      |    4 ++++
 gio/gdesktopappinfo.c               |   13 +++++++++++++
 gio/gio.symbols                     |    1 +
 gio/tests/appinfo-test.desktop      |    1 +
 gio/tests/appinfo.c                 |   16 ++++++++++++++++
 7 files changed, 67 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gio/gio-sections.txt b/docs/reference/gio/gio-sections.txt
index 584a3f5..7c5636d 100644
--- a/docs/reference/gio/gio-sections.txt
+++ b/docs/reference/gio/gio-sections.txt
@@ -1313,6 +1313,7 @@ g_app_info_set_as_last_used_for_type
 g_app_info_add_supports_type
 g_app_info_can_remove_supports_type
 g_app_info_remove_supports_type
+g_app_info_get_supported_types
 g_app_info_get_all
 g_app_info_get_all_for_type
 g_app_info_get_default_for_type
diff --git a/gio/gappinfo.c b/gio/gappinfo.c
index 666d2b0..53d3c39 100644
--- a/gio/gappinfo.c
+++ b/gio/gappinfo.c
@@ -458,6 +458,37 @@ g_app_info_remove_supports_type (GAppInfo    *appinfo,
   return FALSE;
 }
 
+/**
+ * g_app_info_get_supported_types:
+ * @info: a #GAppInfo that can handle files
+ *
+ * Retrieves the list of content types that @app_info claims to support.
+ * If this information is not provided by the environment, this function
+ * will return %NULL.
+ * This function does not take in consideration associations added with
+ * g_app_info_add_supports_type(), but only those exported directly by
+ * the application.
+ *
+ * Returns: (transfer none) (array zero-terminated=1) (element-type utf8):
+ *    a list of content types.
+ *
+ * Since: 2.34
+ */
+const char **
+g_app_info_get_supported_types (GAppInfo *appinfo)
+{
+  GAppInfoIface *iface;
+
+  g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
+
+  iface = G_APP_INFO_GET_IFACE (appinfo);
+
+  if (iface->get_supported_types)
+    return iface->get_supported_types (appinfo);
+  else
+    return NULL;
+}
+
 
 /**
  * g_app_info_get_icon:
diff --git a/gio/gappinfo.h b/gio/gappinfo.h
index b6786d6..17d2f76 100644
--- a/gio/gappinfo.h
+++ b/gio/gappinfo.h
@@ -132,6 +132,7 @@ struct _GAppInfoIface
   gboolean     (* set_as_last_used_for_type)    (GAppInfo           *appinfo,
                                                  const char         *content_type,
                                                  GError            **error);
+  const char ** (* get_supported_types)         (GAppInfo           *appinfo);
 };
 
 GType       g_app_info_get_type                     (void) G_GNUC_CONST;
@@ -174,6 +175,9 @@ gboolean    g_app_info_can_remove_supports_type     (GAppInfo             *appin
 gboolean    g_app_info_remove_supports_type         (GAppInfo             *appinfo,
                                                      const char           *content_type,
                                                      GError              **error);
+GLIB_AVAILABLE_IN_2_34
+const char **g_app_info_get_supported_types         (GAppInfo             *appinfo);
+
 gboolean    g_app_info_can_delete                   (GAppInfo   *appinfo);
 gboolean    g_app_info_delete                       (GAppInfo   *appinfo);
 
diff --git a/gio/gdesktopappinfo.c b/gio/gdesktopappinfo.c
index 4044679..fafea1c 100644
--- a/gio/gdesktopappinfo.c
+++ b/gio/gdesktopappinfo.c
@@ -108,6 +108,7 @@ struct _GDesktopAppInfo
   char *path;
   char *categories;
   char *startup_wm_class;
+  char **mime_types;
 
   guint nodisplay       : 1;
   guint hidden          : 1;
@@ -187,6 +188,7 @@ g_desktop_app_info_finalize (GObject *object)
   g_free (info->path);
   g_free (info->categories);
   g_free (info->startup_wm_class);
+  g_strfreev (info->mime_types);
   
   G_OBJECT_CLASS (g_desktop_app_info_parent_class)->finalize (object);
 }
@@ -333,6 +335,7 @@ g_desktop_app_info_load_from_keyfile (GDesktopAppInfo *info,
   info->hidden = g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_HIDDEN, NULL) != FALSE;
   info->categories = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_CATEGORIES, NULL);
   info->startup_wm_class = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, STARTUP_WM_CLASS_KEY, NULL);
+  info->mime_types = g_key_file_get_string_list (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_MIME_TYPE, NULL, NULL);
   
   info->icon = NULL;
   if (info->icon_name)
@@ -1981,6 +1984,15 @@ g_desktop_app_info_remove_supports_type (GAppInfo    *appinfo,
                                error);
 }
 
+static const char **
+g_desktop_app_info_get_supported_types (GAppInfo *appinfo)
+{
+  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
+
+  return (const char**) info->mime_types;
+}
+
+
 static gboolean
 g_desktop_app_info_ensure_saved (GDesktopAppInfo  *info,
 				 GError          **error)
@@ -2202,6 +2214,7 @@ g_desktop_app_info_iface_init (GAppInfoIface *iface)
   iface->get_commandline = g_desktop_app_info_get_commandline;
   iface->get_display_name = g_desktop_app_info_get_display_name;
   iface->set_as_last_used_for_type = g_desktop_app_info_set_as_last_used_for_type;
+  iface->get_supported_types = g_desktop_app_info_get_supported_types;
 }
 
 static gboolean
diff --git a/gio/gio.symbols b/gio/gio.symbols
index f4dff35..3f6f773 100644
--- a/gio/gio.symbols
+++ b/gio/gio.symbols
@@ -56,6 +56,7 @@ g_app_info_get_description
 g_app_info_get_executable
 g_app_info_get_commandline
 g_app_info_get_icon
+g_app_info_get_supported_types
 g_app_info_launch
 g_app_info_supports_uris
 g_app_info_supports_files
diff --git a/gio/tests/appinfo-test.desktop b/gio/tests/appinfo-test.desktop
index f2b873a..e4d8396 100644
--- a/gio/tests/appinfo-test.desktop
+++ b/gio/tests/appinfo-test.desktop
@@ -10,3 +10,4 @@ Exec=./appinfo-test --option
 Icon=testicon
 StartupNotify=true
 StartupWMClass=appinfo-class
+MimeType=image/png;image/jpeg;
diff --git a/gio/tests/appinfo.c b/gio/tests/appinfo.c
index bb24669..e8e511a 100644
--- a/gio/tests/appinfo.c
+++ b/gio/tests/appinfo.c
@@ -287,6 +287,21 @@ test_startup_wm_class (void)
   g_object_unref (appinfo);
 }
 
+static void
+test_supported_types (void)
+{
+  GAppInfo *appinfo;
+  const char * const *content_types;
+
+  appinfo = G_APP_INFO (g_desktop_app_info_new_from_filename (SRCDIR "/appinfo-test.desktop"));
+  content_types = g_app_info_get_supported_types (appinfo);
+
+  g_assert_cmpint (g_strv_length ((char**)content_types), ==, 2);
+  g_assert_cmpstr (content_types[0], ==, "image/png");
+
+  g_object_unref (appinfo);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -303,6 +318,7 @@ main (int argc, char *argv[])
   g_test_add_func ("/appinfo/associations", test_associations);
   g_test_add_func ("/appinfo/environment", test_environment);
   g_test_add_func ("/appinfo/startup-wm-class", test_startup_wm_class);
+  g_test_add_func ("/appinfo/supported-types", test_supported_types);
 
   return g_test_run ();
 }