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-rw-r--r--progress.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/progress.c b/progress.c
index 412e6b1..2e31bec 100644
--- a/progress.c
+++ b/progress.c
@@ -72,6 +72,12 @@ static void clear_progress_signal(void)
progress_update = 0;
}
+static int is_foreground_fd(int fd)
+{
+ int tpgrp = tcgetpgrp(fd);
+ return tpgrp < 0 || tpgrp == getpgid(0);
+}
+
static int display(struct progress *progress, unsigned n, const char *done)
{
const char *eol, *tp;
@@ -98,16 +104,21 @@ static int display(struct progress *progress, unsigned n, const char *done)
unsigned percent = n * 100 / progress->total;
if (percent != progress->last_percent || progress_update) {
progress->last_percent = percent;
- fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
- progress->title, percent, n,
- progress->total, tp, eol);
- fflush(stderr);
+ if (is_foreground_fd(fileno(stderr)) || done) {
+ fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
+ progress->title, percent, n,
+ progress->total, tp, eol);
+ fflush(stderr);
+ }
progress_update = 0;
return 1;
}
} else if (progress_update) {
- fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol);
- fflush(stderr);
+ if (is_foreground_fd(fileno(stderr)) || done) {
+ fprintf(stderr, "%s: %u%s%s",
+ progress->title, n, tp, eol);
+ fflush(stderr);
+ }
progress_update = 0;
return 1;
}