factored out file loading and saving into the View specialisation IOView

this will allow us to use the same algorithms for loading and saving
Q-Registers (from/to file).
 * Saving with EW when a Q-Reg is edited has been fixed (was broken earlier)
 * SciTECO save point files are now named .teco-X-BASENAME
   When using IOView for Q-Regs, there will be no way to sensible count
   the save points. Each write of a Q-Reg may be to another file.
   Therefore, we number save-points globally.
   If the sequence of writes has to be reconstructed manually,
   one can still look at the save point files' modification dates
 * give more informative error messages when saving a file fails

1 files changed, 67 insertions, 0 deletions

diff --git a/src/ioview.h b/src/ioview.h
new file mode 100644
index 0000000..0c1e653
--- /dev/null
+++ b/src/ioview.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2012-2014 Robin Haberkorn
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __IOVIEW_H
+#define __IOVIEW_H
+
+#include <glib.h>
+#include <glib/gstdio.h>
+
+#include "sciteco.h"
+#include "interface.h"
+#include "undo.h"
+
+namespace SciTECO {
+
+/*
+ * Auxiliary functions
+ */
+
+/*
+ * Get absolute/full version of a possibly relative path.
+ * Works with existing and non-existing paths (in the latter case,
+ * heuristics may be applied.)
+ */
+gchar *get_absolute_path(const gchar *path);
+
+class IOView : public ViewCurrent {
+	class UndoTokenRemoveFile : public UndoToken {
+		gchar *filename;
+
+	public:
+		UndoTokenRemoveFile(const gchar *_filename)
+				   : filename(g_strdup(_filename)) {}
+		~UndoTokenRemoveFile()
+		{
+			g_free(filename);
+		}
+
+		void
+		run(void)
+		{
+			g_unlink(filename);
+		}
+	};
+
+public:
+	void load(const gchar *filename);
+	void save(const gchar *filename);
+};
+
+} /* namespace SciTECO */
+
+#endif