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csi: scroll visible content into scrollback on Ctrl+L

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When Ctrl+L is pressed (ESC[2J], scroll visible content into scrollback
before clearing the screen, matching Alacritty and Ghostty behavior.

Only scrolls non-empty rows to prevent extra spacing gaps. Applies to
normal screen buffer only, not alternate screen.

Preserves command history instead of losing it entirely.

Addresses #939
This commit is contained in:
Anmol Sekhon 2025-06-24 10:17:27 -04:00
parent 968bc05c32
commit 35268404c4
1 changed files with 35 additions and 1 deletions
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36
csi.c
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@ -983,11 +983,45 @@ csi_dispatch(struct terminal *term, uint8_t final)
break;
}
case 2:
case 2: {
/* Erase entire screen */
/* First, scroll the visible content into scrollback history
* (like Alacritty and Ghostty do) - only for normal screen */
if (term->grid == &term->normal) {
/* Find the last non-empty row to avoid scrolling empty space */
int last_non_empty_row = -1;
for (int r = term->rows - 1; r >= 0; r--) {
const struct row *row = grid_row_in_view(term->grid, r);
if (row != NULL) {
/* Check if this row has any non-empty cells */
bool row_has_content = false;
for (int c = 0; c < term->cols; c++) {
const struct cell *cell = &row->cells[c];
if (!(cell->wc == 0 || cell->wc == CELL_SPACER)) {
row_has_content = true;
break;
}
}
if (row_has_content) {
last_non_empty_row = r;
break;
}
}
}
/* Only scroll if we have content to preserve */
if (last_non_empty_row >= 0) {
/* Scroll only up to the last non-empty row + 1 */
term_scroll(term, last_non_empty_row + 1);
}
}
/* Then clear the now-empty visible screen */
term_erase(term, 0, 0, term->rows - 1, term->cols - 1);
term->grid->cursor.lcf = false;
break;
}
case 3: {
/* Erase scrollback */