[tepl] File saving: implement win.tepl-save and win.tepl-save-as GActions

[Sébastien Wilmet <swilmet src gnome org>]

commit a5f62a5191620c105a3d21e3d9a7082e115da81d
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Oct 12 12:46:32 2017 +0200

    File saving: implement win.tepl-save and win.tepl-save-as GActions
    
    Start with a simple implementation.

 tepl/tepl-application-window.c |  187 ++++++++++++++++++++++++++++++++++++++++
 tepl/tepl-application.c        |   11 +++
 2 files changed, 198 insertions(+), 0 deletions(-)
---
diff --git a/tepl/tepl-application-window.c b/tepl/tepl-application-window.c
index 5da8120..3c0b0fb 100644
--- a/tepl/tepl-application-window.c
+++ b/tepl/tepl-application-window.c
@@ -24,6 +24,9 @@
 #include "tepl-abstract-factory.h"
 #include "tepl-application.h"
 #include "tepl-buffer.h"
+#include "tepl-file.h"
+#include "tepl-file-saver.h"
+#include "tepl-info-bar.h"
 #include "tepl-tab.h"
 #include "tepl-tab-group.h"
 #include "tepl-view.h"
@@ -55,6 +58,9 @@
  * - `"win.tepl-new-file"`: creates a new #TeplTab, appends it with
  *   tepl_tab_group_append_tab() and set it as the active tab.
  * - `"win.tepl-open"`: shows a #GtkFileChooser to open a new file.
+ * - `"win.tepl-save"`: saves the current file.
+ * - `"win.tepl-save-as"`: shows a #GtkFileChooser to save the current file to a
+ *   different location.
  *
  * ## For the Edit menu
  *
@@ -185,6 +191,163 @@ open_cb (GSimpleAction *open_action,
 }
 
 static void
+file_saver_cb (GObject      *source_object,
+              GAsyncResult *result,
+              gpointer      user_data)
+{
+       TeplFileSaver *saver = TEPL_FILE_SAVER (source_object);
+       TeplTab *tab = TEPL_TAB (user_data);
+       GError *error = NULL;
+       GApplication *app;
+
+       if (tepl_file_saver_save_finish (saver, result, &error))
+       {
+               TeplFile *file;
+
+               file = tepl_file_saver_get_file (saver);
+               tepl_file_add_uri_to_recent_manager (file);
+       }
+
+       if (error != NULL)
+       {
+               TeplInfoBar *info_bar;
+
+               info_bar = tepl_info_bar_new_simple (GTK_MESSAGE_ERROR,
+                                                    _("Error when saving the file."),
+                                                    error->message);
+               tepl_info_bar_add_close_button (info_bar);
+               tepl_tab_add_info_bar (tab, GTK_INFO_BAR (info_bar));
+               gtk_widget_show (GTK_WIDGET (info_bar));
+
+               g_clear_error (&error);
+       }
+
+       app = g_application_get_default ();
+       g_application_unmark_busy (app);
+       g_application_release (app);
+
+       g_object_unref (saver);
+       g_object_unref (tab);
+}
+
+static void
+launch_saver (TeplTab       *tab,
+             TeplFileSaver *saver)
+{
+       GApplication *app;
+
+       app = g_application_get_default ();
+       g_application_hold (app);
+       g_application_mark_busy (app);
+
+       tepl_file_saver_save_async (saver,
+                                   G_PRIORITY_DEFAULT,
+                                   NULL,
+                                   NULL,
+                                   NULL,
+                                   NULL,
+                                   file_saver_cb,
+                                   g_object_ref (tab));
+}
+
+static void
+save_cb (GSimpleAction *save_action,
+        GVariant      *parameter,
+        gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+       TeplTab *tab;
+       TeplBuffer *buffer;
+       TeplFile *file;
+       GFile *location;
+
+       tab = tepl_tab_group_get_active_tab (TEPL_TAB_GROUP (tepl_window));
+       g_return_if_fail (tab != NULL);
+
+       buffer = tepl_tab_get_buffer (tab);
+       file = tepl_buffer_get_file (buffer);
+       location = tepl_file_get_location (file);
+
+       if (location != NULL)
+       {
+               TeplFileSaver *saver;
+
+               saver = tepl_file_saver_new (buffer, file);
+               launch_saver (tab, saver);
+       }
+       else
+       {
+               g_action_group_activate_action (G_ACTION_GROUP (tepl_window->priv->gtk_window),
+                                               "tepl-save-as",
+                                               NULL);
+       }
+}
+
+static void
+save_file_chooser_response_cb (GtkFileChooserDialog *file_chooser_dialog,
+                              gint                  response_id,
+                              TeplTab              *tab)
+{
+       if (response_id == GTK_RESPONSE_ACCEPT)
+       {
+               TeplBuffer *buffer;
+               TeplFile *file;
+               GFile *location;
+               TeplFileSaver *saver;
+
+               buffer = tepl_tab_get_buffer (tab);
+               file = tepl_buffer_get_file (buffer);
+               location = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (file_chooser_dialog));
+
+               saver = tepl_file_saver_new_with_target (buffer, file, location);
+               launch_saver (tab, saver);
+
+               g_object_unref (location);
+       }
+
+       gtk_widget_destroy (GTK_WIDGET (file_chooser_dialog));
+}
+
+static void
+save_as_cb (GSimpleAction *save_as_action,
+           GVariant      *parameter,
+           gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+       TeplTab *tab;
+       GtkWidget *file_chooser_dialog;
+       GtkFileChooser *file_chooser;
+
+       tab = tepl_tab_group_get_active_tab (TEPL_TAB_GROUP (tepl_window));
+       g_return_if_fail (tab != NULL);
+
+       file_chooser_dialog = gtk_file_chooser_dialog_new (_("Save File"),
+                                                          GTK_WINDOW (tepl_window->priv->gtk_window),
+                                                          GTK_FILE_CHOOSER_ACTION_SAVE,
+                                                          _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                                          _("_Save"), GTK_RESPONSE_ACCEPT,
+                                                          NULL);
+
+       gtk_dialog_set_default_response (GTK_DIALOG (file_chooser_dialog), GTK_RESPONSE_ACCEPT);
+
+       /* Prevent tab from being destroyed. */
+       gtk_window_set_modal (GTK_WINDOW (file_chooser_dialog), TRUE);
+
+       file_chooser = GTK_FILE_CHOOSER (file_chooser_dialog);
+
+       gtk_file_chooser_set_do_overwrite_confirmation (file_chooser, TRUE);
+       gtk_file_chooser_set_local_only (file_chooser, FALSE);
+
+       g_signal_connect_object (file_chooser_dialog,
+                                "response",
+                                G_CALLBACK (save_file_chooser_response_cb),
+                                tab,
+                                0);
+
+       gtk_widget_show (file_chooser_dialog);
+}
+
+static void
 undo_cb (GSimpleAction *action,
         GVariant      *parameter,
         gpointer       user_data)
@@ -353,6 +516,26 @@ unindent_cb (GSimpleAction *action,
 }
 
 static void
+update_save_actions_sensitivity (TeplApplicationWindow *tepl_window)
+{
+       TeplBuffer *buffer;
+       GActionMap *action_map;
+       GAction *action;
+
+       buffer = tepl_tab_group_get_active_buffer (TEPL_TAB_GROUP (tepl_window));
+
+       action_map = G_ACTION_MAP (tepl_window->priv->gtk_window);
+
+       action = g_action_map_lookup_action (action_map, "tepl-save");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    buffer != NULL);
+
+       action = g_action_map_lookup_action (action_map, "tepl-save-as");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    buffer != NULL);
+}
+
+static void
 update_undo_redo_actions_sensitivity (TeplApplicationWindow *tepl_window)
 {
        TeplView *view;
@@ -545,6 +728,7 @@ update_basic_edit_actions_sensitivity (TeplApplicationWindow *tepl_window)
 static void
 update_actions_sensitivity (TeplApplicationWindow *tepl_window)
 {
+       update_save_actions_sensitivity (tepl_window);
        update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
        update_paste_action_sensitivity (tepl_window);
@@ -564,6 +748,8 @@ add_actions (TeplApplicationWindow *tepl_window)
                /* File menu */
                { "tepl-new-file", new_file_cb },
                { "tepl-open", open_cb },
+               { "tepl-save", save_cb },
+               { "tepl-save-as", save_as_cb },
 
                /* Edit menu */
                { "tepl-undo", undo_cb },
@@ -1047,6 +1233,7 @@ active_buffer_changed (TeplApplicationWindow *tepl_window)
                                                  tepl_window));
 
 end:
+       update_save_actions_sensitivity (tepl_window);
        update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
 
diff --git a/tepl/tepl-application.c b/tepl/tepl-application.c
index d14a0be..f62d10f 100644
--- a/tepl/tepl-application.c
+++ b/tepl/tepl-application.c
@@ -30,6 +30,11 @@
  *
  * #TeplApplication extends the #GtkApplication class.
  *
+ * For some features, the Tepl framework gets the default #GtkApplication with
+ * g_application_get_default(), for example to call g_application_hold(),
+ * g_application_mark_busy(), etc. Normally a GTK+ application has only one
+ * #GApplication per process, so this shouldn't cause any problem.
+ *
  * Note that #TeplApplication extends the #GtkApplication class but without
  * subclassing it, because several libraries might want to extend
  * #GtkApplication and an application needs to be able to use all those
@@ -79,6 +84,12 @@ init_tepl_action_info_store (TeplApplication *tepl_app)
                { "win.tepl-open", "document-open", N_("_Open"), "<Control>o",
                  N_("Open a file") },
 
+               { "win.tepl-save", "document-save", N_("_Save"), "<Control>s",
+                 N_("Save the current file") },
+
+               { "win.tepl-save-as", "document-save-as", N_("Save _As"), "<Shift><Control>s",
+                 N_("Save the current file to a different location") },
+
                /* Edit menu */
 
                { "win.tepl-undo", "edit-undo", N_("_Undo"), "<Control>z",