CE edit implement line breaking

ce/edit.c

@@ -175,6 +175,28 @@ void edit_start (const char* file_path, const char* text) {
         gapbuffer_backspace (&editor.current_line->gb);
       }
       break;
+    case '\n': {
+      struct edit_line* new_line = malloc (sizeof (*new_line));
+      memset (new_line, 0, sizeof (*new_line));
+
+      char* tail = gapbuffer_string_at (&warena_malloc, &temp_arena, &editor.current_line->gb,
+                                        editor.cursor.col);
+      size_t tail_size = strlen (tail);
+
+      gapbuffer_init (&wmalloc, NULL, &new_line->gb, tail_size > 0 ? tail_size : 32);
+
+      for (size_t i = 0; i < tail_size; i++) {
+        char chr = gapbuffer_at (&editor.current_line->gb, editor.cursor.col);
+        gapbuffer_delete_at (&editor.current_line->gb, editor.cursor.col);
+        gapbuffer_insert (&wrealloc, NULL, &new_line->gb, chr);
+      }
+
+      list_insert_after (editor.lines, &editor.current_line->lines_link, &new_line->lines_link);
+
+      editor.cursor.col = 0;
+      editor.cursor.line++;
+      editor.current_line = new_line;
+    } break;
     case KB_DELETE:
       if (editor.cursor.col < gapbuffer_length (&editor.current_line->gb))
         editor.current_line->gb.gap_end++;