Add mouse support

README.md

@@ -6,8 +6,6 @@ A TUI IDE.
 
 # TODO
 
-- [ ] Fix problem highlighting selection when line is empty.
-- [ ] Add mouse support.
 - [ ] Add struct as union of structs that can take input. or similar
     - then send input to them.
     - Also background thread will run worker function for whatever struct is selected.

include/editor.h

@@ -115,8 +115,10 @@ void scroll_up(Editor *editor, uint32_t number);
 void scroll_down(Editor *editor, uint32_t number);
 void ensure_cursor(Editor *editor);
 void ensure_scroll(Editor *editor);
+void handle_editor_event(Editor *editor, KeyEvent event);
 void apply_edit(std::vector<Span> &spans, uint32_t x, int64_t y);
 void edit_erase(Editor *editor, Coord pos, int64_t len);
 void edit_insert(Editor *editor, Coord pos, char *data, uint32_t len);
+Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y);
 
 #endif

include/main.h

@@ -10,5 +10,6 @@
 #define RUNNER 3
 
 extern std::atomic<bool> running;
+extern uint8_t mode;
 
 #endif

src/editor.cc

@@ -73,13 +73,8 @@ void render_editor(Editor *editor) {
                     editor->cursor.col;
     uint32_t sel2 = line_to_byte(editor->root, editor->selection.row, nullptr) +
                     editor->selection.col;
-    if (sel1 <= sel2) {
+    sel_start = MIN(sel1, sel2);
-      sel_start = sel1;
+    sel_end = MAX(sel1, sel2);
-      sel_end = sel2;
-    } else {
-      sel_start = sel2;
-      sel_end = sel1;
-    }
   }
   Coord cursor = {UINT32_MAX, UINT32_MAX};
   uint32_t line_index = editor->scroll.row;

src/editor_ctrl.cc

@@ -2,191 +2,234 @@ extern "C" {
 #include "../libs/libgrapheme/grapheme.h"
 }
 #include "../include/editor.h"
+#include "../include/main.h"
 #include "../include/utils.h"
 
-void cursor_down(Editor *editor, uint32_t number) {
+void handle_editor_event(Editor *editor, KeyEvent event) {
-  if (!editor || !editor->root || number == 0)
+  if (event.key_type == KEY_SPECIAL) {
-    return;
+    switch (event.special_key) {
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+    case KEY_DOWN:
-  uint32_t len;
+      cursor_down(editor, 1);
-  char *line_content = next_line(it, &len);
-  if (line_content == nullptr)
-    return;
-  if (editor->cursor_preffered == UINT32_MAX)
-    editor->cursor_preffered =
-        get_visual_col_from_bytes(line_content, len, editor->cursor.col);
-  uint32_t visual_col = editor->cursor_preffered;
-  do {
-    free(line_content);
-    line_content = next_line(it, &len);
-    editor->cursor.row += 1;
-    if (editor->cursor.row >= editor->root->line_count) {
-      editor->cursor.row = editor->root->line_count - 1;
       break;
-    };
+    case KEY_UP:
-    if (editor->folded[editor->cursor.row] != 0)
+      cursor_up(editor, 1);
-      number++;
+      break;
-  } while (--number > 0);
+    case KEY_LEFT:
-  free(it);
+      cursor_left(editor, 1);
-  if (line_content == nullptr)
+      break;
-    return;
+    case KEY_RIGHT:
-  editor->cursor.col = get_bytes_from_visual_col(line_content, len, visual_col);
+      cursor_right(editor, 1);
-  free(line_content);
+      break;
+    }
+  }
+  if (event.key_type == KEY_MOUSE) {
+    switch (event.mouse_state) {
+    case SCROLL:
+      switch (event.mouse_direction) {
+      case SCROLL_UP:
+        scroll_up(editor, 10);
+        ensure_cursor(editor);
+        break;
+      case SCROLL_DOWN:
+        scroll_down(editor, 10);
+        ensure_cursor(editor);
+        break;
+      }
+      break;
+    case PRESS:
+      if (event.mouse_button == LEFT_BTN) {
+        Coord p = editor_hit_test(editor, event.mouse_x, event.mouse_y);
+        editor->cursor = p;
+        editor->cursor_preffered = UINT32_MAX;
+        editor->selection = p;
+      }
+      break;
+    case DRAG:
+      if (event.mouse_button == LEFT_BTN) {
+        Coord p = editor_hit_test(editor, event.mouse_x, event.mouse_y);
+        editor->cursor = p;
+        editor->cursor_preffered = UINT32_MAX;
+        editor->selection_active = true;
+      }
+      break;
+    case RELEASE:
+      if (event.mouse_button == LEFT_BTN)
+        if (editor->cursor.row == editor->selection.row &&
+            editor->cursor.col == editor->selection.col)
+          editor->selection_active = false;
+      break;
+    }
+  }
+  switch (mode) {
+  case NORMAL:
+    if (event.key_type == KEY_CHAR && event.len == 1) {
+      switch (event.c[0]) {
+      case 'a':
+      case 'i':
+        mode = INSERT;
+        break;
+      case 's':
+      case 'v':
+        mode = SELECT;
+        editor->selection_active = true;
+        editor->selection = editor->cursor;
+        break;
+      case ';':
+      case ':':
+        mode = RUNNER;
+        break;
+      case 0x7F:
+        cursor_left(editor, 1);
+        break;
+      case ' ':
+        cursor_right(editor, 1);
+        break;
+      case '\r':
+      case '\n':
+        cursor_down(editor, 1);
+        break;
+      case '\\':
+      case '|':
+        cursor_up(editor, 1);
+        break;
+      case CTRL('d'):
+        scroll_down(editor, 1);
+        ensure_cursor(editor);
+        break;
+      case CTRL('u'):
+        scroll_up(editor, 1);
+        ensure_cursor(editor);
+        break;
+      }
+    }
+    break;
+  case INSERT:
+    if (event.key_type == KEY_CHAR) {
+      if (event.len == 1) {
+        if (event.c[0] == '\t') {
+          edit_insert(editor, editor->cursor, (char *)"  ", 1);
+          cursor_right(editor, 2);
+        } else if (event.c[0] == '\n' || event.c[0] == '\r') {
+          edit_insert(editor, editor->cursor, (char *)"\n", 1);
+          cursor_right(editor, 1);
+        } else if (event.c[0] == 0x7F) {
+          edit_erase(editor, editor->cursor, -1);
+        } else if (isprint((unsigned char)(event.c[0]))) {
+          edit_insert(editor, editor->cursor, event.c, 1);
+          cursor_right(editor, 1);
+        } else if (event.c[0] == 0x1B) {
+          mode = NORMAL;
+        }
+      } else if (event.len > 1) {
+        edit_insert(editor, editor->cursor, event.c, event.len);
+        cursor_right(editor, 1);
+      }
+    }
+    if (event.key_type == KEY_SPECIAL && event.special_key == KEY_DELETE)
+      edit_erase(editor, editor->cursor, 1);
+    break;
+  case SELECT:
+    if (event.key_type == KEY_CHAR && event.len == 1) {
+      switch (event.c[0]) {
+      case 0x1B:
+      case 's':
+      case 'v':
+        editor->selection_active = false;
+        mode = NORMAL;
+        break;
+      }
+    }
+    break;
+  case RUNNER:
+    if (event.key_type == KEY_CHAR && event.len == 1) {
+      switch (event.c[0]) {
+      case 0x1B:
+        mode = NORMAL;
+        break;
+      }
+    }
+    break;
+  }
+  ensure_scroll(editor);
+  if (event.key_type == KEY_CHAR && event.c)
+    free(event.c);
 }
 
-void cursor_up(Editor *editor, uint32_t number) {
+Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y) {
-  if (!editor || !editor->root || number == 0)
+  uint32_t target_visual_row = y;
-    return;
+  uint32_t visual_row = 0;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  uint32_t line_index = editor->scroll.row;
-  uint32_t len;
+  bool first_visual_line = true;
-  char *line_content = next_line(it, &len);
+  std::shared_lock knot_lock(editor->knot_mtx);
-  if (!line_content) {
+  LineIterator *it = begin_l_iter(editor->root, line_index);
+  if (!it)
+    return editor->scroll;
+  while (visual_row <= target_visual_row) {
+    if (editor->folded[line_index]) {
+      if (editor->folded[line_index] == 2) {
+        if (visual_row == target_visual_row) {
           free(it);
-    return;
+          return {line_index, 0};
         }
-  if (editor->cursor_preffered == UINT32_MAX)
+        visual_row++;
-    editor->cursor_preffered =
+      }
-        get_visual_col_from_bytes(line_content, len, editor->cursor.col);
+      do {
-  uint32_t visual_col = editor->cursor_preffered;
+        char *l = next_line(it, nullptr);
-  free(line_content);
+        if (!l)
-  while (number > 0 && editor->cursor.row > 0) {
+          break;
-    editor->cursor.row--;
+        free(l);
-    if (editor->folded[editor->cursor.row] != 0)
+        line_index++;
+      } while (editor->folded[line_index] == 1);
       continue;
-    number--;
     }
-  free(it);
-  it = begin_l_iter(editor->root, editor->cursor.row);
-  line_content = next_line(it, &len);
-  if (!line_content) {
-    free(it);
-    return;
-  }
-  editor->cursor.col = get_bytes_from_visual_col(line_content, len, visual_col);
-  free(line_content);
-  free(it);
-}
-
-void cursor_right(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
-    return;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
     uint32_t line_len;
     char *line = next_line(it, &line_len);
-  free(it);
-  if (!line)
-    return;
-  if (line[line_len - 1] == '\n')
-    --line_len;
-  while (number > 0) {
-    if (editor->cursor.col >= line_len) {
-      free(line);
-      line = nullptr;
-      uint32_t next_row = editor->cursor.row + 1;
-      while (next_row < editor->root->line_count &&
-             editor->folded[next_row] != 0)
-        next_row++;
-      if (next_row >= editor->root->line_count) {
-        editor->cursor.col = line_len;
-        break;
-      }
-      editor->cursor.row = next_row;
-      editor->cursor.col = 0;
-      it = begin_l_iter(editor->root, editor->cursor.row);
-      line = next_line(it, &line_len);
-      free(it);
     if (!line)
       break;
-      if (line[line_len - 1] == '\n')
+    if (line_len && line[line_len - 1] == '\n')
-        --line_len;
+      line_len--;
-    } else {
+    uint32_t offset = first_visual_line ? editor->scroll.col : 0;
-      uint32_t inc = grapheme_next_character_break_utf8(
+    first_visual_line = false;
-          line + editor->cursor.col, line_len - editor->cursor.col);
+    while (offset < line_len || (line_len == 0 && offset == 0)) {
-      if (inc == 0)
+      uint32_t col = 0;
+      uint32_t advance = 0;
+      uint32_t left = line_len - offset;
+      uint32_t last_good_offset = offset;
+      while (left > 0 && col < editor->size.col) {
+        uint32_t g =
+            grapheme_next_character_break_utf8(line + offset + advance, left);
+        int w = display_width(line + offset + advance, g);
+        if (col + w > editor->size.col)
           break;
-      editor->cursor.col += inc;
+        if (visual_row == target_visual_row && x < col + w) {
-    }
-    number--;
-  }
-  LineIterator *it2 = begin_l_iter(editor->root, editor->cursor.row);
-  uint32_t len2;
-  char *cur_line = next_line(it2, &len2);
-  free(it2);
-  if (cur_line) {
-    if (len2 > 0 && cur_line[len2 - 1] == '\n')
-      --len2;
-    editor->cursor_preffered =
-        get_visual_col_from_bytes(cur_line, len2, editor->cursor.col);
-    free(cur_line);
-  } else {
-    editor->cursor_preffered = UINT32_MAX;
-  }
-  if (line)
           free(line);
-}
-
-void cursor_left(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
-    return;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
-  uint32_t len;
-  char *line = next_line(it, &len);
           free(it);
-  if (!line)
+          return {line_index, offset + advance + g};
-    return;
+        }
-  if (line[len - 1] == '\n')
+        advance += g;
-    line[--len] = '\0';
+        last_good_offset = offset + advance;
-  while (number > 0) {
+        left -= g;
-    if (editor->cursor.col == 0) {
+        col += w;
+      }
+      if (visual_row == target_visual_row) {
         free(line);
-      line = nullptr;
-      if (editor->cursor.row == 0)
-        break;
-      int32_t prev_row = editor->cursor.row - 1;
-      while (prev_row >= 0 && editor->folded[prev_row] != 0)
-        prev_row--;
-      if (prev_row < 0)
-        break;
-      editor->cursor.row = prev_row;
-      it = begin_l_iter(editor->root, editor->cursor.row);
-      line = next_line(it, &len);
         free(it);
-      if (!line)
+        return {line_index, last_good_offset};
+      }
+      visual_row++;
+      if (visual_row > target_visual_row)
         break;
-      if (line[len - 1] == '\n')
+      if (advance == 0)
-        --len;
+        break;
-      editor->cursor.col = len;
+      offset += advance;
-    } else {
+      if (line_len == 0)
-      uint32_t col = editor->cursor.col;
-      uint32_t new_col = 0;
-      uint32_t visual_col = 0;
-      while (new_col < col) {
-        uint32_t inc =
-            grapheme_next_character_break_utf8(line + new_col, len - new_col);
-        if (new_col + inc >= col)
         break;
-        new_col += inc;
-        visual_col++;
     }
-      editor->cursor.col = new_col;
-    }
-    number--;
-  }
-  LineIterator *it2 = begin_l_iter(editor->root, editor->cursor.row);
-  uint32_t len2;
-  char *cur_line = next_line(it2, &len2);
-  free(it2);
-  if (cur_line) {
-    if (len2 > 0 && cur_line[len2 - 1] == '\n')
-      --len2;
-    editor->cursor_preffered =
-        get_visual_col_from_bytes(cur_line, len2, editor->cursor.col);
-    free(cur_line);
-  } else {
-    editor->cursor_preffered = UINT32_MAX;
-  }
-  if (line)
     free(line);
+    line_index++;
+  }
+  free(it);
+  return editor->scroll;
 }
 
 Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
@@ -294,6 +337,83 @@ Coord move_left(Editor *editor, Coord cursor, uint32_t number) {
   return result;
 }
 
+void cursor_down(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  uint32_t len;
+  char *line_content = next_line(it, &len);
+  if (line_content == nullptr)
+    return;
+  if (editor->cursor_preffered == UINT32_MAX)
+    editor->cursor_preffered =
+        get_visual_col_from_bytes(line_content, len, editor->cursor.col);
+  uint32_t visual_col = editor->cursor_preffered;
+  do {
+    free(line_content);
+    line_content = next_line(it, &len);
+    editor->cursor.row += 1;
+    if (editor->cursor.row >= editor->root->line_count) {
+      editor->cursor.row = editor->root->line_count - 1;
+      break;
+    };
+    if (editor->folded[editor->cursor.row] != 0)
+      number++;
+  } while (--number > 0);
+  free(it);
+  if (line_content == nullptr)
+    return;
+  editor->cursor.col = get_bytes_from_visual_col(line_content, len, visual_col);
+  free(line_content);
+}
+
+void cursor_up(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  uint32_t len;
+  char *line_content = next_line(it, &len);
+  if (!line_content) {
+    free(it);
+    return;
+  }
+  if (editor->cursor_preffered == UINT32_MAX)
+    editor->cursor_preffered =
+        get_visual_col_from_bytes(line_content, len, editor->cursor.col);
+  uint32_t visual_col = editor->cursor_preffered;
+  free(line_content);
+  while (number > 0 && editor->cursor.row > 0) {
+    editor->cursor.row--;
+    if (editor->folded[editor->cursor.row] != 0)
+      continue;
+    number--;
+  }
+  free(it);
+  it = begin_l_iter(editor->root, editor->cursor.row);
+  line_content = next_line(it, &len);
+  if (!line_content) {
+    free(it);
+    return;
+  }
+  editor->cursor.col = get_bytes_from_visual_col(line_content, len, visual_col);
+  free(line_content);
+  free(it);
+}
+
+void cursor_right(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  editor->cursor = move_right(editor, editor->cursor, number);
+  editor->cursor_preffered = UINT32_MAX;
+}
+
+void cursor_left(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  editor->cursor = move_left(editor, editor->cursor, number);
+  editor->cursor_preffered = UINT32_MAX;
+}
+
 void edit_erase(Editor *editor, Coord pos, int64_t len) {
   if (len == 0)
     return;
@@ -308,33 +428,13 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
     uint32_t start = line_to_byte(editor->root, point.row, nullptr) + point.col;
     if (cursor_original > start && cursor_original <= byte_pos) {
       editor->cursor = point;
-      LineIterator *it = begin_l_iter(editor->root, point.row);
+      editor->cursor_preffered = UINT32_MAX;
-      if (!it)
-        return;
-      uint32_t line_len;
-      char *line = next_line(it, &line_len);
-      free(it);
-      if (!line)
-        return;
-      editor->cursor_preffered =
-          get_visual_col_from_bytes(line, line_len, point.col);
-      free(line);
     } else if (cursor_original > byte_pos) {
       uint32_t cursor_new = cursor_original - (byte_pos - start);
       uint32_t new_col;
       uint32_t new_row = byte_to_line(editor->root, cursor_new, &new_col);
       editor->cursor = {new_row, new_col};
-      LineIterator *it = begin_l_iter(editor->root, new_row);
+      editor->cursor_preffered = UINT32_MAX;
-      if (!it)
-        return;
-      uint32_t line_len;
-      char *line = next_line(it, &line_len);
-      free(it);
-      if (!line)
-        return;
-      editor->cursor_preffered =
-          get_visual_col_from_bytes(line, line_len, new_col);
-      free(line);
     }
     lock_1.unlock();
     std::unique_lock lock_2(editor->knot_mtx);
@@ -366,33 +466,13 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
     uint32_t end = line_to_byte(editor->root, point.row, nullptr) + point.col;
     if (cursor_original > byte_pos && cursor_original <= end) {
       editor->cursor = pos;
-      LineIterator *it = begin_l_iter(editor->root, pos.row);
+      editor->cursor_preffered = UINT32_MAX;
-      if (!it)
-        return;
-      uint32_t line_len;
-      char *line = next_line(it, &line_len);
-      free(it);
-      if (!line)
-        return;
-      editor->cursor_preffered =
-          get_visual_col_from_bytes(line, line_len, pos.col);
-      free(line);
     } else if (cursor_original > end) {
       uint32_t cursor_new = cursor_original - (end - byte_pos);
       uint32_t new_col;
       uint32_t new_row = byte_to_line(editor->root, cursor_new, &new_col);
       editor->cursor = {new_row, new_col};
-      LineIterator *it = begin_l_iter(editor->root, new_row);
+      editor->cursor_preffered = UINT32_MAX;
-      if (!it)
-        return;
-      uint32_t line_len;
-      char *line = next_line(it, &line_len);
-      free(it);
-      if (!line)
-        return;
-      editor->cursor_preffered =
-          get_visual_col_from_bytes(line, line_len, new_col);
-      free(line);
     }
     lock_1.unlock();
     std::unique_lock lock_2(editor->knot_mtx);

src/editor_scroll.cc

@@ -163,6 +163,14 @@ void scroll_down(Editor *editor, uint32_t number) {
     free(line);
     line_index++;
   }
+  if (q_size > 0) {
+    uint32_t idx;
+    if (q_size < max_visual_lines)
+      idx = (q_head + q_size - 1) % max_visual_lines;
+    else
+      idx = q_head;
+    editor->scroll = scroll_queue[idx];
+  }
   free(it);
   free(scroll_queue);
 }
@@ -216,13 +224,6 @@ void ensure_cursor(Editor *editor) {
       Coord current = {line_index, offset};
       last_visible = current;
       visual_rows++;
-      if (line_index == editor->cursor.row) {
-        if (editor->cursor.col >= offset) {
-          free(line);
-          free(it);
-          return;
-        }
-      }
       if (visual_rows >= editor->size.row)
         break;
       uint32_t col = 0;
@@ -238,6 +239,14 @@ void ensure_cursor(Editor *editor) {
         left -= g;
         col += w;
       }
+      if (line_index == editor->cursor.row) {
+        if (editor->cursor.col >= offset &&
+            editor->cursor.col < offset + advance) {
+          free(line);
+          free(it);
+          return;
+        }
+      }
       if (advance == 0)
         break;
       offset += advance;

src/main.cc

@@ -4,17 +4,20 @@
 #include "../include/ui.h"
 #include <atomic>
 #include <chrono>
+#include <cstdint>
 #include <sys/ioctl.h>
 #include <thread>
 
 std::atomic<bool> running{true};
 Queue<KeyEvent> event_queue;
+std::vector<Editor *> editors;
 
+uint8_t current_editor = 0;
 uint8_t mode = NORMAL;
 
-void background_worker(Editor *editor) {
+void background_worker() {
   while (running) {
-    ts_collect_spans(editor);
+    ts_collect_spans(editors[current_editor]);
     std::this_thread::sleep_for(std::chrono::milliseconds(16));
   }
 }
@@ -34,138 +37,61 @@ void input_listener() {
   }
 }
 
-void handle_editor_event(Editor *editor, KeyEvent event) {
+Editor *editor_at(uint8_t x, uint8_t y) {
-  if (event.key_type == KEY_SPECIAL) {
+  for (Editor *ed : editors) {
-    switch (event.special_key) {
+    Coord pos = ed->position;
-    case KEY_DOWN:
+    Coord size = ed->size;
-      cursor_down(editor, 1);
+    if (x >= pos.col && x < pos.col + size.col && y >= pos.row &&
-      break;
+        y < pos.row + size.row)
-    case KEY_UP:
+      return ed;
-      cursor_up(editor, 1);
-      break;
-    case KEY_LEFT:
-      cursor_left(editor, 1);
-      break;
-    case KEY_RIGHT:
-      cursor_right(editor, 1);
-      break;
   }
+  return nullptr;
 }
-  switch (mode) {
+
-  case NORMAL:
+uint8_t index_of(Editor *ed) {
-    if (event.key_type == KEY_CHAR && event.len == 1) {
+  for (uint8_t i = 0; i < editors.size(); i++) {
-      switch (event.c[0]) {
+    if (editors[i] == ed)
-      case 'a':
+      return i;
-      case 'i':
-        mode = INSERT;
-        break;
-      case 's':
-      case 'v':
-        mode = SELECT;
-        editor->selection_active = true;
-        editor->selection = editor->cursor;
-        break;
-      case ';':
-      case ':':
-        mode = RUNNER;
-        break;
-      case 0x7F:
-        cursor_left(editor, 1);
-        break;
-      case ' ':
-        cursor_right(editor, 1);
-        break;
-      case '\r':
-      case '\n':
-        cursor_down(editor, 1);
-        break;
-      case '\\':
-      case '|':
-        cursor_up(editor, 1);
-        break;
-      case CTRL('d'):
-        scroll_down(editor, 1);
-        ensure_cursor(editor);
-        break;
-      case CTRL('u'):
-        scroll_up(editor, 1);
-        ensure_cursor(editor);
-        break;
   }
-    }
+  return 0;
-    break;
-  case INSERT:
-    if (event.key_type == KEY_CHAR) {
-      if (event.len == 1) {
-        if (event.c[0] == '\t') {
-          edit_insert(editor, editor->cursor, (char *)"  ", 1);
-          cursor_right(editor, 2);
-        } else if (event.c[0] == '\n' || event.c[0] == '\r') {
-          edit_insert(editor, editor->cursor, (char *)"\n", 1);
-          cursor_right(editor, 1);
-        } else if (event.c[0] == 0x7F) {
-          edit_erase(editor, editor->cursor, -1);
-        } else if (isprint((unsigned char)(event.c[0]))) {
-          edit_insert(editor, editor->cursor, event.c, 1);
-          cursor_right(editor, 1);
-        } else if (event.c[0] == 0x1B) {
-          mode = NORMAL;
-        }
-      } else if (event.len > 1) {
-        edit_insert(editor, editor->cursor, event.c, event.len);
-        cursor_right(editor, 1);
-      }
-    }
-    if (event.key_type == KEY_SPECIAL && event.special_key == KEY_DELETE)
-      edit_erase(editor, editor->cursor, 1);
-    break;
-  case SELECT:
-    if (event.key_type == KEY_CHAR && event.len == 1) {
-      switch (event.c[0]) {
-      case 0x1B:
-      case 's':
-      case 'v':
-        editor->selection_active = false;
-        mode = NORMAL;
-        break;
-      }
-    }
-    break;
-  case RUNNER:
-    if (event.key_type == KEY_CHAR && event.len == 1) {
-      switch (event.c[0]) {
-      case 0x1B:
-        mode = NORMAL;
-        break;
-      }
-    }
-    break;
-  }
-  ensure_scroll(editor);
-  if (event.key_type == KEY_CHAR && event.c)
-    free(event.c);
 }
 
 int main(int argc, char *argv[]) {
   Coord screen = start_screen();
   const char *filename = (argc > 1) ? argv[1] : "";
 
-  Editor *editor = new_editor(filename, {0, 0}, screen);
+  Editor *editor =
+      new_editor(filename, {10, 10}, {screen.row - 20, screen.col - 20});
   if (!editor) {
     end_screen();
     fprintf(stderr, "Failed to load editor\n");
     return 1;
   }
 
+  editors.push_back(editor);
+  current_editor = editors.size() - 1;
+
   std::thread input_thread(input_listener);
-  std::thread work_thread(background_worker, editor);
+  std::thread work_thread(background_worker);
 
   while (running) {
     KeyEvent event;
-    while (event_queue.pop(event))
+    while (event_queue.pop(event)) {
-      handle_editor_event(editor, event);
+      if (event.key_type == KEY_MOUSE) {
+        Editor *target = editor_at(event.mouse_x, event.mouse_y);
+        if (!target)
+          continue;
+        if (event.mouse_state == PRESS)
+          current_editor = index_of(target);
+        event.mouse_x -= target->position.col;
+        event.mouse_y -= target->position.row;
+        handle_editor_event(target, event);
+      } else {
+        handle_editor_event(editors[current_editor], event);
+      }
+    }
 
-    render_editor(editor);
+    render_editor(editors[current_editor]);
     render();
 
     std::this_thread::sleep_for(std::chrono::milliseconds(8));