1 files changed, 39 insertions, 0 deletions
diff --git a/examples/dte/change.h b/examples/dte/change.h
new file mode 100644
index 0000000..a0d08f1
--- /dev/null
+++ b/examples/dte/change.h
@@ -0,0 +1,39 @@
+#ifndef CHANGE_H
+#define CHANGE_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include "util/macros.h"
+#include "view.h"
+
+typedef enum {
+    CHANGE_MERGE_NONE,
+    CHANGE_MERGE_INSERT,
+    CHANGE_MERGE_DELETE,
+    CHANGE_MERGE_ERASE,
+} ChangeMergeEnum;
+
+typedef struct Change {
+    struct Change *next;
+    struct Change **prev;
+    unsigned long nr_prev;
+    bool move_after; // Move after inserted text when undoing delete?
+    size_t offset;
+    size_t del_count;
+    size_t ins_count;
+    char *buf; // Deleted bytes (inserted bytes need not be saved)
+} Change;
+
+void begin_change(ChangeMergeEnum m);
+void end_change(void);
+void begin_change_chain(void);
+void end_change_chain(View *view) NONNULL_ARGS;
+bool undo(View *view) NONNULL_ARGS WARN_UNUSED_RESULT;
+bool redo(View *view, unsigned long change_id) NONNULL_ARGS WARN_UNUSED_RESULT;
+void free_changes(Change *c) NONNULL_ARGS;
+void buffer_insert_bytes(View *view, const char *buf, size_t len) NONNULL_ARG(1);
+void buffer_delete_bytes(View *view, size_t len) NONNULL_ARGS;
+void buffer_erase_bytes(View *view, size_t len) NONNULL_ARGS;
+void buffer_replace_bytes(View *view, size_t del_count, const char *ins, size_t ins_count) NONNULL_ARG(1);
+
+#endif