also adds progress when actually writing a pack

If that pack is big, it takes significant time to write and might
benefit from some more eye candies as well.  This is however disabled
when the pack is written to stdout since in that case the output is
usually piped into unpack_objects which already does its own progress
reporting.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/pack-objects.c b/pack-objects.c
index 5e1e14c..dc928b3 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -53,6 +53,7 @@
 static const char *base_name;
 static unsigned char pack_file_sha1[20];
 static int progress = 1;
+static volatile int progress_update = 0;
 
 /*
  * The object names in objects array are hashed with this hashtable,
@@ -333,8 +334,14 @@
 	hdr.hdr_entries = htonl(nr_objects);
 	sha1write(f, &hdr, sizeof(hdr));
 	offset = sizeof(hdr);
-	for (i = 0; i < nr_objects; i++)
+	for (i = 0; i < nr_objects; i++) {
 		offset = write_one(f, objects + i, offset);
+		if (progress_update) {
+			fprintf(stderr, "Writing (%d %d%%)\r",
+				i+1, (i+1) * 100/nr_objects);
+			progress_update = 0;
+		}
+	}
 
 	sha1close(f, pack_file_sha1, 1);
 }
@@ -662,7 +669,6 @@
 	return 0;
 }
 
-static volatile int progress_update = 0;
 static void progress_interval(int signum)
 {
 	signal(SIGALRM, progress_interval);
@@ -735,7 +741,6 @@
 	sorted_by_type = create_sorted_list(type_size_sort);
 	if (window && depth)
 		find_deltas(sorted_by_type, window+1, depth);
-	write_pack_file();
 }
 
 static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
@@ -905,6 +910,14 @@
 		;
 	else {
 		prepare_pack(window, depth);
+		if (progress && pack_to_stdout) {
+			/* the other end usually displays progress itself */
+			struct itimerval v = {{0,},};
+			setitimer(ITIMER_REAL, &v, NULL);
+			signal(SIGALRM, SIG_IGN );
+			progress_update = 0;
+		}
+		write_pack_file();
 		if (!pack_to_stdout) {
 			write_index_file();
 			puts(sha1_to_hex(object_list_sha1));