diff options
| -rw-r--r-- | src/bar.c | 36 |
1 files changed, 23 insertions, 13 deletions
@@ -80,8 +80,26 @@ static char *ass_itoa(char *str, unsigned int n) { return str + len; } +/** Reset the scrollable region and hide the bar. */ +static int bfs_bar_reset(struct bfs_bar *bar) { + return bfs_bar_puts(bar, + "\0337" // DECSC: Save cursor + "\033[r" // DECSTBM: Reset scrollable region + "\0338" // DECRC: Restore cursor + "\033[J" // ED: Erase display from cursor to end + ); +} + +/** Hide the bar if the terminal is shorter than this. */ +#define BFS_BAR_MIN_HEIGHT 3 + /** Update the size of the scrollable region. */ static int bfs_bar_resize(struct bfs_bar *bar) { + unsigned int height = load(&bar->height, relaxed); + if (height < BFS_BAR_MIN_HEIGHT) { + return bfs_bar_reset(bar); + } + static const char PREFIX[] = "\033D" // IND: Line feed, possibly scrolling "\033[1A" // CUU: Move cursor up 1 row @@ -95,10 +113,8 @@ static int bfs_bar_resize(struct bfs_bar *bar) { char esc_seq[sizeof(PREFIX) + ITOA_DIGITS + sizeof(SUFFIX)]; // DECSTBM takes the height as the second argument - unsigned int height = load(&bar->height, relaxed) - 1; - char *cur = stpcpy(esc_seq, PREFIX); - cur = ass_itoa(cur, height); + cur = ass_itoa(cur, height - 1); cur = stpcpy(cur, SUFFIX); return bfs_bar_write(bar, esc_seq, cur - esc_seq); @@ -113,16 +129,6 @@ static void bfs_bar_sigwinch(int sig, siginfo_t *info, void *arg) { } #endif -/** Reset the scrollable region and hide the bar. */ -static int bfs_bar_reset(struct bfs_bar *bar) { - return bfs_bar_puts(bar, - "\0337" // DECSC: Save cursor - "\033[r" // DECSTBM: Reset scrollable region - "\0338" // DECRC: Restore cursor - "\033[J" // ED: Erase display from cursor to end - ); -} - /** Signal handler for process-terminating signals. */ static void bfs_bar_sigexit(int sig, siginfo_t *info, void *arg) { struct bfs_bar *bar = arg; @@ -191,6 +197,10 @@ unsigned int bfs_bar_width(const struct bfs_bar *bar) { int bfs_bar_update(struct bfs_bar *bar, const char *str) { unsigned int height = load(&bar->height, relaxed); + if (height < BFS_BAR_MIN_HEIGHT) { + return 0; + } + return bfs_bar_printf(bar, "\0337" // DECSC: Save cursor "\033[%u;0f" // HVP: Move cursor to row, column |