[evolution] Bug 779907 - Backup file name extension not updated after switching file filter

[Milan Crha <mcrha src gnome org>]

commit df204d46c2723d65375a4383932c1c97c61772a0
Author: Milan Crha <mcrha redhat com>
Date:   Mon Mar 20 19:04:29 2017 +0100

    Bug 779907 - Backup file name extension not updated after switching file filter

 .../backup-restore/evolution-backup-restore.c      |   56 +++++++++++++++++++-
 1 files changed, 54 insertions(+), 2 deletions(-)
---
diff --git a/src/modules/backup-restore/evolution-backup-restore.c 
b/src/modules/backup-restore/evolution-backup-restore.c
index 2d078cb..f3d183d 100644
--- a/src/modules/backup-restore/evolution-backup-restore.c
+++ b/src/modules/backup-restore/evolution-backup-restore.c
@@ -179,11 +179,63 @@ dialog_prompt_user (GtkWindow *parent,
 }
 
 static void
-set_local_only (GtkFileChooser *file_chooser)
+file_chooser_filter_changed_cb (GtkFileChooser *file_chooser,
+                               GParamSpec *param,
+                               gpointer user_data)
+{
+       GtkFileFilter *filter;
+       const gchar *filter_name, *extension = NULL;
+       gchar *current_name;
+
+       g_return_if_fail (GTK_IS_FILE_CHOOSER (file_chooser));
+
+       filter = gtk_file_chooser_get_filter (file_chooser);
+       if (!filter)
+               return;
+
+       filter_name = gtk_file_filter_get_name (filter);
+       if (g_strcmp0 (filter_name, "*.tar.xz") == 0) {
+               extension = ".tar.xz";
+       } else if (g_strcmp0 (filter_name, "*.tar.gz") == 0) {
+               extension = ".tar.gz";
+       }
+
+       if (!extension)
+               return;
+
+       current_name = gtk_file_chooser_get_current_name (file_chooser);
+       if (!current_name)
+               return;
+
+       if (!g_str_has_suffix (current_name, extension) &&
+           (g_str_has_suffix (current_name, ".tar.xz") ||
+            g_str_has_suffix (current_name, ".tar.gz"))) {
+               gint extension_len, current_len;
+
+               extension_len = strlen (extension);
+               current_len = strlen (current_name);
+
+               current_name[current_len - 2] = extension[extension_len - 2];
+
+               gtk_file_chooser_set_current_name (file_chooser, current_name);
+       }
+
+       g_free (current_name);
+}
+
+static void
+set_local_only (GtkFileChooser *file_chooser,
+               gpointer user_data)
 {
        /* XXX Has to be a local file, since the backup utility
         *     takes a filename argument, not a URI. */
        gtk_file_chooser_set_local_only (file_chooser, TRUE);
+
+       /* Not NULL when saving file. */
+       if (user_data) {
+               g_signal_connect (file_chooser, "notify::filter",
+                       G_CALLBACK (file_chooser_filter_changed_cb), NULL);
+       }
 }
 
 static gchar *
@@ -232,7 +284,7 @@ action_settings_backup_cb (GtkAction *action,
                e_shell_window_get_shell (shell_window),
                _("Select name of the Evolution backup file"),
                suggest, has_xz ? "*.tar.xz;*.tar.gz" : "*.tar.gz", (GtkCallback)
-               set_local_only, NULL);
+               set_local_only, has_xz ? GINT_TO_POINTER (1) : NULL);
 
        g_free (suggest);