Convert composer autosave to an EExtension.

Given the way the autosave feature was awkwardly bolted on to the
composer, an EExtension seemed like a natural fit.  And it helped
clean up some object lifecycle hacks (and bugs).

What we have now is a new module consisting of two EExtensions:

   EComposerAutosave extends EMsgComposer and determines when to
   kick off an asynchronous autosave operation.

   EComposerRegistry extends EShell and offers to restore orphaned
   autosave files on startup (which is also asynchronous now).

e-autosave-utils.c holds the actual asynchronous functions and a few
other miscellaneous utility functions.

Source code for the new module lives in /modules/composer-autosave.

1 files changed, 48 insertions, 0 deletions

diff --git a/modules/composer-autosave/e-autosave-utils.h b/modules/composer-autosave/e-autosave-utils.h
new file mode 100644
index 0000000000..3a33d6b90a
--- /dev/null
+++ b/modules/composer-autosave/e-autosave-utils.h
@@ -0,0 +1,48 @@
+/*
+ * e-autosave-utils.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifndef E_AUTOSAVE_UTILS_H
+#define E_AUTOSAVE_UTILS_H
+
+#include <shell/e-shell.h>
+#include <composer/e-msg-composer.h>
+
+G_BEGIN_DECLS
+
+GList *		e_composer_find_orphans		(GQueue *registry,
+						 GError **error);
+void		e_composer_load_snapshot	(EShell *shell,
+						 GFile *snapshot_file,
+						 GCancellable *cancellable,
+						 GAsyncReadyCallback callback,
+						 gpointer user_data);
+EMsgComposer *	e_composer_load_snapshot_finish	(EShell *shell,
+						 GAsyncResult *result,
+						 GError **error);
+void		e_composer_save_snapshot	(EMsgComposer *composer,
+						 GCancellable *cancellable,
+						 GAsyncReadyCallback callback,
+						 gpointer user_data);
+gboolean	e_composer_save_snapshot_finish	(EMsgComposer *composer,
+						 GAsyncResult *result,
+						 GError **error);
+GFile *		e_composer_get_snapshot_file	(EMsgComposer *composer);
+
+G_END_DECLS
+
+#endif /* E_AUTOSAVE_UTILS_H */