Add wide character support (tabs/emojis) and other minor fixes

include/editor.h

@@ -107,15 +107,13 @@ Editor *new_editor(const char *filename, Coord position, Coord size);
 void free_editor(Editor *editor);
 void render_editor(Editor *editor);
 void fold(Editor *editor, uint32_t start_line, uint32_t end_line);
-void scroll_up(Editor *editor, uint32_t lines);
-void scroll_down(Editor *editor, uint32_t lines);
 void cursor_up(Editor *editor, uint32_t number);
 void cursor_down(Editor *editor, uint32_t number);
 void cursor_left(Editor *editor, uint32_t number);
 void cursor_right(Editor *editor, uint32_t number);
 void ensure_scroll(Editor *editor);
 void apply_edit(std::vector<Span> &spans, uint32_t x, int64_t y);
-void edit_erase(Editor *editor, uint32_t pos, uint32_t len);
+void edit_erase(Editor *editor, uint32_t pos, int64_t len);
 void edit_insert(Editor *editor, uint32_t pos, char *data, uint32_t len);
 
 #endif

include/knot.h

@@ -26,7 +26,6 @@ typedef struct LineIterator {
   Knot *node;
   uint8_t top;
   uint32_t offset;
-  uint32_t line;
   Knot *stack[64];
 } LineIterator;
 
@@ -116,7 +115,7 @@ LineIterator *begin_l_iter(Knot *root, uint32_t start_line);
 // After getting the necessary lines free the iterator (no need to go upto the
 // end) returns null if there are no more lines All return strings `must` be
 // freed by the caller
-char *next_line(LineIterator *it);
+char *next_line(LineIterator *it, uint32_t *out_len);
 
 // Used to start an iterator over leaf data
 // root is the root of the rope

include/ui.h

@@ -46,10 +46,6 @@
 #define CNTRL_ALT 3
 #define SHIFT 4
 
-const char VS16_BYTE_A = '\xEF';
-const char VS16_BYTE_B = '\xB8';
-const char VS16_BYTE_C = '\x8F';
-
 enum CellFlags : uint8_t {
   CF_NONE = 0,
   CF_ITALIC = 1 << 0,
@@ -86,9 +82,6 @@ extern std::vector<ScreenCell> old_screen;
 extern std::mutex screen_mutex;
 extern std::atomic<bool> running;
 
-void get_terminal_size();
-void enable_raw_mode();
-void disable_raw_mode();
 Coord start_screen();
 void end_screen();
 void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
@@ -100,6 +93,4 @@ Coord get_size();
 int read_input(char *buf, size_t buflen);
 KeyEvent read_key();
 
-int display_width(const char *str);
-
 #endif

include/utils.h

@@ -36,9 +36,11 @@ struct Coord {
   uint32_t col;
 };
 
-uint32_t visual_width(const char *s);
-uint32_t get_visual_col_from_bytes(const char *line, uint32_t byte_limit);
-uint32_t get_bytes_from_visual_col(const char *line,
+// std::vector<uint32_t> visual_width(const char *s, uint32_t max_width);
+int display_width(const char *str, size_t len);
+uint32_t get_visual_col_from_bytes(const char *line, uint32_t len,
+                                   uint32_t byte_limit);
+uint32_t get_bytes_from_visual_col(const char *line, uint32_t len,
                                    uint32_t target_visual_col);
 void log(const char *fmt, ...);
 std::string get_exe_dir();