make display of total transferred fully accurate

The minimum delay of 1/2 sec between successive throughput updates might
not have been elapsed when display_throughput() is called for the last
time, potentially making the display of total transferred bytes not
right when progress is said to be done.

Let's force an update of the throughput display as well when the
progress is complete.  As a side effect, the total transferred will
always be displayed even if the actual transfer rate doesn't have time
to kickin.

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

progress.c

@@ -14,11 +14,12 @@
 #define TP_IDX_MAX      8
 
 struct throughput {
+	off_t curr_total;
 	off_t prev_total;
 	struct timeval prev_tv;
 	unsigned int avg_bytes;
-	unsigned int last_bytes[TP_IDX_MAX];
 	unsigned int avg_misecs;
+	unsigned int last_bytes[TP_IDX_MAX];
 	unsigned int last_misecs[TP_IDX_MAX];
 	unsigned int idx;
 	char display[32];
@@ -109,6 +110,30 @@ static int display(struct progress *progress, unsigned n, int done)
 	return 0;
 }
 
+static void throughput_string(struct throughput *tp, off_t total,
+			      unsigned int rate)
+{
+	int l = sizeof(tp->display);
+	if (total > 1 << 30) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u GiB",
+			      (int)(total >> 30),
+			      (int)(total & ((1 << 30) - 1)) / 10737419);
+	} else if (total > 1 << 20) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u MiB",
+			      (int)(total >> 20),
+			      ((int)(total & ((1 << 20) - 1)) * 100) >> 20);
+	} else if (total > 1 << 10) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u KiB",
+			      (int)(total >> 10),
+			      ((int)(total & ((1 << 10) - 1)) * 100) >> 10);
+	} else {
+		l -= snprintf(tp->display, l, ", %u bytes", (int)total);
+	}
+	if (rate)
+		snprintf(tp->display + sizeof(tp->display) - l, l,
+			 " | %u KiB/s", rate);
+}
+
 void display_throughput(struct progress *progress, off_t total)
 {
 	struct throughput *tp;
@@ -124,11 +149,12 @@ void display_throughput(struct progress *progress, off_t total)
 	if (!tp) {
 		progress->throughput = tp = calloc(1, sizeof(*tp));
 		if (tp) {
-			tp->prev_total = total;
+			tp->prev_total = tp->curr_total = total;
 			tp->prev_tv = tv;
 		}
 		return;
 	}
+	tp->curr_total = total;
 
 	/*
 	 * We have x = bytes and y = microsecs.  We want z = KiB/s:
@@ -149,39 +175,21 @@ void display_throughput(struct progress *progress, off_t total)
 	misecs += (int)(tv.tv_usec - tp->prev_tv.tv_usec) / 977;
 
 	if (misecs > 512) {
-		int l = sizeof(tp->display);
-		unsigned int count = total - tp->prev_total;
+		unsigned int count, rate;
+
+		count = total - tp->prev_total;
 		tp->prev_total = total;
 		tp->prev_tv = tv;
 		tp->avg_bytes += count;
 		tp->avg_misecs += misecs;
-
-		if (total > 1 << 30) {
-			l -= snprintf(tp->display, l, ", %u.%2.2u GiB",
-				      (int)(total >> 30),
-				      (int)(total & ((1 << 30) - 1)) / 10737419);
-		} else if (total > 1 << 20) {
-			l -= snprintf(tp->display, l, ", %u.%2.2u MiB",
-				      (int)(total >> 20),
-				      ((int)(total & ((1 << 20) - 1))
-				       * 100) >> 20);
-		} else if (total > 1 << 10) {
-			l -= snprintf(tp->display, l, ", %u.%2.2u KiB",
-				      (int)(total >> 10),
-				      ((int)(total & ((1 << 10) - 1))
-				       * 100) >> 10);
-		} else {
-			l -= snprintf(tp->display, l, ", %u bytes", (int)total);
-		}
-		snprintf(tp->display + sizeof(tp->display) - l, l,
-			 " | %u KiB/s", tp->avg_bytes / tp->avg_misecs);
-
+		rate = tp->avg_bytes / tp->avg_misecs;
 		tp->avg_bytes -= tp->last_bytes[tp->idx];
 		tp->avg_misecs -= tp->last_misecs[tp->idx];
 		tp->last_bytes[tp->idx] = count;
 		tp->last_misecs[tp->idx] = misecs;
 		tp->idx = (tp->idx + 1) % TP_IDX_MAX;
 
+		throughput_string(tp, total, rate);
 		if (progress->last_value != -1 && progress_update)
 			display(progress, progress->last_value, 0);
 	}
@@ -225,6 +233,12 @@ void stop_progress(struct progress **p_progress)
 	*p_progress = NULL;
 	if (progress->last_value != -1) {
 		/* Force the last update */
+		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);
 	}