Major fixes:

- ChunkIterator is now bidirectional
- LineIterator is now also bidirectional
- Undo/redo history operations
- Replace operation
- Range based api functions
- And more minor bug fixes

include/vase/vase.h

@@ -2,14 +2,29 @@
 
 #include "buffer/append.h"
 #include "buffer/original.h"
+#include "constants.h"
 #include "iterators/line.h"
 #include "pch.h"
 #include "search.h"
 #include "shard.h"
 #include "utils/utils.h"
 
+struct Point {
+  uint32_t row;
+  uint32_t col;
+};
+
+struct Range {
+  Point start;
+  Point end;
+};
+
 struct Vase {
-  Vase(char *data, uint32_t length);
+  OriginalBuffer original;
+  AppendBuffer append;
+  Shard *root;
+
+  Vase(std::string path);
 
   ~Vase();
 
@@ -20,26 +35,33 @@ struct Vase {
 
   LineIterator iterate(uint32_t line);
 
-  void input(Point *point, char key);
+  void insert(Point *point, char key);
   void insert(Point *point, const char *data, uint32_t len);
   void erase(Point *point, int64_t amount);
-  bool jump(Point *point, int64_t amount);
-  bool clamp(Point *point);
+  void erase(Range range);
+  void replace(Range range, const char *data, uint32_t len);
+
+  void move_clusters(Point *point, int64_t amount);
+  void move_lines(Point *point, int64_t amount);
+  void clamp(Point *point);
+
   void regex_search_replace(
     std::string_view pattern,
     Point start, Point end,
     std::string_view replace, std::string_view options
   );
 
-private:
-  OriginalBuffer original;
-  AppendBuffer append;
-  Shard *root;
+  bool undo();
+  bool redo();
 
-  /*std::vector<Shard *> undo; // TODO: later
-  uint16_t top; // of the undo stack.
-  uint16_t max; // for redo when no edits have been done after some undo.*/
+  void snapshot();
+  void prune_history(uint32_t n);
+
+private:
+  std::vector<Shard *> history;
+  uint32_t history_top;
 
   uint32_t offset_of(Point point);
   static void flatten(Shard *s, std::string &out);
+  void _insert(Point *point, const char *data, uint32_t len);
 };