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mruby-bin-mirb: preserve cursor position during TAB auto-indent

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When TAB triggers auto-indentation, preserve the cursor's relative
position within the line instead of moving it to the indent boundary.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-12-15 14:26:10 +09:00
parent f585cc2eff
commit ac306ae3e5
1 changed files with 13 additions and 4 deletions
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mrbgems/mruby-bin-mirb/tools/mirb/mirb_editor.c
+13 -4
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@@ -358,6 +358,7 @@ handle_tab_indent(mirb_editor *ed)
size_t current_spaces = 0;
size_t i;
const char *content;
size_t saved_cursor_col = ed->buf.cursor_col;
/* Calculate expected indent from code up to previous line */
if (ed->buf.cursor_line > 0) {
@@ -401,7 +402,6 @@ handle_tab_indent(mirb_editor *ed)
for (i = 0; i < add; i++) {
mirb_buffer_insert_char(&ed->buf, ' ');
}
ed->buf.cursor_col = target_spaces;
}
else if (target_spaces < current_spaces) {
/* Need to remove spaces */
@@ -410,11 +410,20 @@ handle_tab_indent(mirb_editor *ed)
for (i = 0; i < remove; i++) {
mirb_buffer_delete_back(&ed->buf);
}
ed->buf.cursor_col = target_spaces;
}
/* Restore cursor position adjusted for indent change */
if (target_spaces >= current_spaces) {
ed->buf.cursor_col = saved_cursor_col + (target_spaces - current_spaces);
}
else {
/* Already correct, move cursor to end of indent */
ed->buf.cursor_col = target_spaces;
size_t removed = current_spaces - target_spaces;
if (saved_cursor_col >= removed) {
ed->buf.cursor_col = saved_cursor_col - removed;
}
else {
ed->buf.cursor_col = 0;
}
}
}