nicer display of thin pack completion

In the same spirit of prettifying Git's output display for mere mortals,
here's a simple extension to the progress API allowing for a final
message to be provided when terminating a progress line, and use it for
the display of the number of objects needed to complete a thin pack,
saving yet one more line of screen display.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

index-pack.c

@@ -792,6 +792,7 @@ int main(int argc, char **argv)
 		flush();
 	} else {
 		if (fix_thin_pack) {
+			char msg[48];
 			int nr_unresolved = nr_deltas - nr_resolved_deltas;
 			int nr_objects_initial = nr_objects;
 			if (nr_unresolved <= 0)
@@ -800,12 +801,11 @@ int main(int argc, char **argv)
 					   (nr_objects + nr_unresolved + 1)
 					   * sizeof(*objects));
 			fix_unresolved_deltas(nr_unresolved);
-			stop_progress(&progress);
-			if (verbose)
-				fprintf(stderr, "%d objects were added to complete this thin pack.\n",
-					nr_objects - nr_objects_initial);
+			sprintf(msg, "completed with %d local objects",
+				nr_objects - nr_objects_initial);
+			stop_progress_msg(&progress, msg);
 			fixup_pack_header_footer(output_fd, sha1,
-				curr_pack, nr_objects);
+						 curr_pack, nr_objects);
 		}
 		if (nr_deltas != nr_resolved_deltas)
 			die("pack has %d unresolved deltas",

progress.c

@@ -69,9 +69,9 @@ static void clear_progress_signal(void)
 	progress_update = 0;
 }
 
-static int display(struct progress *progress, unsigned n, int done)
+static int display(struct progress *progress, unsigned n, const char *done)
 {
-	char *eol, *tp;
+	const char *eol, *tp;
 
 	if (progress->delay) {
 		if (!progress_update || --progress->delay)
@@ -90,7 +90,7 @@ static int display(struct progress *progress, unsigned n, int done)
 
 	progress->last_value = n;
 	tp = (progress->throughput) ? progress->throughput->display : "";
-	eol = done ? ", done.   \n" : "   \r";
+	eol = done ? done : "   \r";
 	if (progress->total) {
 		unsigned percent = n * 100 / progress->total;
 		if (percent != progress->last_percent || progress_update) {
@@ -191,13 +191,13 @@ void display_throughput(struct progress *progress, off_t total)
 
 		throughput_string(tp, total, rate);
 		if (progress->last_value != -1 && progress_update)
-			display(progress, progress->last_value, 0);
+			display(progress, progress->last_value, NULL);
 	}
 }
 
 int display_progress(struct progress *progress, unsigned n)
 {
-	return progress ? display(progress, n, 0) : 0;
+	return progress ? display(progress, n, NULL) : 0;
 }
 
 struct progress *start_progress_delay(const char *title, unsigned total,
@@ -226,21 +226,28 @@ struct progress *start_progress(const char *title, unsigned total)
 }
 
 void stop_progress(struct progress **p_progress)
+{
+	stop_progress_msg(p_progress, "done");
+}
+
+void stop_progress_msg(struct progress **p_progress, const char *msg)
 {
 	struct progress *progress = *p_progress;
 	if (!progress)
 		return;
 	*p_progress = NULL;
 	if (progress->last_value != -1) {
 		/* Force the last update */
+		char buf[strlen(msg) + 5];
 		struct throughput *tp = progress->throughput;
 		if (tp) {
 			unsigned int rate = !tp->avg_misecs ? 0 :
 					tp->avg_bytes / tp->avg_misecs;
 			throughput_string(tp, tp->curr_total, rate);
 		}
 		progress_update = 1;
-		display(progress, progress->last_value, 1);
+		sprintf(buf, ", %s.\n", msg);
+		display(progress, progress->last_value, buf);
 	}
 	clear_progress_signal();
 	free(progress->throughput);

progress.h

@@ -9,5 +9,6 @@ struct progress *start_progress(const char *title, unsigned total);
 struct progress *start_progress_delay(const char *title, unsigned total,
 				       unsigned percent_treshold, unsigned delay);
 void stop_progress(struct progress **progress);
+void stop_progress_msg(struct progress **progress, const char *msg);
 
 #endif