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term/vt: only do reverse-wrapping (‘bw’) on cub1

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Foot currently does reverse-wrapping (‘auto_left_margin’, or ’bw’) on
everything that calls ‘term_cursor_left()’. This is wrong; it should
only be done for cub1. From man terminfo:

    auto_left_margin | bw | bw | cub1 wraps from column 0 to last
    column

This patch moves the reverse-wrapping logic from term_cursor_left() to
the handling of BS (backspace).

Closes #441
This commit is contained in:
Daniel Eklöf 2021-04-08 12:58:47 +02:00
parent 0b3053f612
commit 5be2c53d8c
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GPG key ID: 5BBD4992C116573F
2 changed files with 18 additions and 40 deletions
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41
terminal.c
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@ -1988,44 +1988,9 @@ term_cursor_home(struct terminal *term)
void
term_cursor_left(struct terminal *term, int count)
{
xassert(count >= 0);
int new_col = term->grid->cursor.point.col - count;
/* Reverse wrap */
if (unlikely(new_col < 0)) {
if (likely(term->reverse_wrap && term->auto_margin)) {
/* Number of rows to reverse wrap through */
int row_count = (abs(new_col) - 1) / term->cols + 1;
/* Row number cursor will end up on */
int new_row_no = term->grid->cursor.point.row - row_count;
/* New column number */
new_col = term->cols - ((abs(new_col) - 1) % term->cols + 1);
xassert(new_col >= 0 && new_col < term->cols);
/* Don't back up past the scroll region */
/* TODO: should this be allowed? */
if (new_row_no < term->scroll_region.start) {
new_row_no = term->scroll_region.start;
new_col = 0;
}
struct row *new_row = grid_row(term->grid, new_row_no);
term->grid->cursor.point.col = new_col;
term->grid->cursor.point.row = new_row_no;
term->grid->cursor.lcf = false;
term->grid->cur_row = new_row;
return;
}
/* Reverse wrap disabled - don't let cursor move past first column */
new_col = 0;
}
xassert(new_col >= 0);
term->grid->cursor.point.col = new_col;
int move_amount = min(term->grid->cursor.point.col, count);
term->grid->cursor.point.col -= move_amount;
xassert(term->grid->cursor.point.col >= 0);
term->grid->cursor.lcf = false;
}