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authorTavian Barnes <tavianator@tavianator.com>2024-08-07 10:53:14 -0400
committerTavian Barnes <tavianator@tavianator.com>2024-08-07 10:53:14 -0400
commite747c913adee1ae915509985dbd5025018037336 (patch)
treee5803b146e5863740dcad21caa489924c40fdc4e /src/bar.c
parent430a53123f8fa37ef1b526f20954ad6077c22fb4 (diff)
downloadbfs-e747c913adee1ae915509985dbd5025018037336.tar.xz
bar: Hide the bar unless the TTY is tall enough
Diffstat (limited to 'src/bar.c')
-rw-r--r--src/bar.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/src/bar.c b/src/bar.c
index aae558f..6ef1198 100644
--- a/src/bar.c
+++ b/src/bar.c
@@ -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