stash undo3

buffer.h

@@ -2,20 +2,23 @@
 #define KE_BUFFER_H
 
 #include "abuf.h"
+#include "undo.h"
 
 
 typedef struct buffer {
-	size_t	 curx, cury;
-	size_t	 rx;
-	size_t	 nrows;
-	size_t	 rowoffs, coloffs;
-	abuf	*row;
-	char	*filename;
-	int	 dirty;
-	int	 mark_set;
-	size_t	 mark_curx, mark_cury;
+	size_t		 curx, cury;
+	size_t		 rx;
+	size_t		 nrows;
+	size_t		 rowoffs, coloffs;
+	abuf		*row;
+	char		*filename;
+	int		 dirty;
+	int		 mark_set;
+	size_t		 mark_curx, mark_cury;
+	undo_tree	 tree;
 } buffer;
 
+
 /* Access current buffer and convenient aliases for file-specific fields */
 buffer		*buffer_current(void);