[PATCH 2/5] progress: return early when in the background

["SZEDER Gábor" <szeder.dev@gmail.com>]

When a git process runs in the background, it doesn't display
progress, only the final "done" line [1].  The condition to check that
are a bit too deep in the display() function, and thus it calculates
the progress percentage even when no progress will be displayed
anyway.

Restructure the display() function to return early when we are in the
background, which prevents the unnecessary progress percentae
calculation, and make the function look a bit better by losing one
level of indentation.

[1] 85cb8906f0 (progress: no progress in background, 2015-04-13)

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 progress.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/progress.c b/progress.c
index 02a20e7d58..b57c0dae16 100644
--- a/progress.c
+++ b/progress.c
@@ -86,28 +86,30 @@ static void display(struct progress *progress, uint64_t n, const char *done)
 		return;
 
 	progress->last_value = n;
+
+	if (!is_foreground_fd(fileno(stderr)) && !done) {
+		progress_update = 0;
+		return;
+	}
+
 	tp = (progress->throughput) ? progress->throughput->display.buf : "";
 	eol = done ? done : "   \r";
 	if (progress->total) {
 		unsigned percent = n * 100 / progress->total;
 		if (percent != progress->last_percent || progress_update) {
 			progress->last_percent = percent;
-			if (is_foreground_fd(fileno(stderr)) || done) {
-				fprintf(stderr, "%s: %3u%% (%"PRIuMAX"/%"PRIuMAX")%s%s",
-					progress->title, percent,
-					(uintmax_t)n, (uintmax_t)progress->total,
-					tp, eol);
-				fflush(stderr);
-			}
+			fprintf(stderr, "%s: %3u%% (%"PRIuMAX"/%"PRIuMAX")%s%s",
+				progress->title, percent,
+				(uintmax_t)n, (uintmax_t)progress->total,
+				tp, eol);
+			fflush(stderr);
 			progress_update = 0;
 			return;
 		}
 	} else if (progress_update) {
-		if (is_foreground_fd(fileno(stderr)) || done) {
-			fprintf(stderr, "%s: %"PRIuMAX"%s%s",
-				progress->title, (uintmax_t)n, tp, eol);
-			fflush(stderr);
-		}
+		fprintf(stderr, "%s: %"PRIuMAX"%s%s",
+			progress->title, (uintmax_t)n, tp, eol);
+		fflush(stderr);
 		progress_update = 0;
 		return;
 	}
-- 
2.21.0.539.g07239c3a71.dirty