Show both elapsed time and estimated remaining time in xz -v.

The extra space for showing both has been taken from the
sizes field. If the sizes grow big, bigger units than MiB
will be used. It makes it slightly difficult to see that
progress is still happening with huge files, but it should
be OK in practice.

Thanks to Trent W. Buck for <http://bugs.debian.org/574583>
and Jonathan Nieder for suggestions how to fix it.

THANKS

@@ -10,6 +10,7 @@ has been important. :-) In alphabetical order:
   - Karl Berry
   - Anders F. Björklund
   - Emmanuel Blot
+  - Trent W. Buck
   - David Burklund
   - Marek Černocký
   - Andrew Dudman

src/xz/message.c

@@ -308,18 +308,8 @@ message_progress_start(lzma_stream *strm, uint64_t in_size)
 
 /// Make the string indicating completion percentage.
 static const char *
-progress_percentage(uint64_t in_pos, bool final)
+progress_percentage(uint64_t in_pos)
 {
-	static char buf[sizeof("100.0 %")];
-
-	double percentage;
-
-	if (final) {
-		// Use floating point conversion of snprintf() also for
-		// 100.0 % instead of fixed string, because the decimal
-		// separator isn't a dot in all locales.
-		percentage = 100.0;
-	} else {
 	// If the size of the input file is unknown or the size told us is
 	// clearly wrong since we have processed more data than the alleged
 	// size of the file, show a static string indicating that we have
@@ -328,10 +318,10 @@ progress_percentage(uint64_t in_pos, bool final)
 		return "--- %";
 
 	// Never show 100.0 % before we actually are finished.
-		percentage = (double)(in_pos) / (double)(expected_in_size)
+	double percentage = (double)(in_pos) / (double)(expected_in_size)
 			* 99.9;
-	}
 
+	static char buf[sizeof("99.9 %")];
 	snprintf(buf, sizeof(buf), "%.1f %%", percentage);
 
 	return buf;
@@ -347,7 +337,7 @@ progress_sizes(uint64_t compressed_pos, uint64_t uncompressed_pos, bool final)
 	// separator is used, or about 1 PiB without thousand separator.
 	// After that the progress indicator will look a bit silly, since
 	// the compression ratio no longer fits with three decimal places.
-	static char buf[44];
+	static char buf[36];
 
 	char *pos = buf;
 	size_t left = sizeof(buf);
@@ -357,9 +347,9 @@ progress_sizes(uint64_t compressed_pos, uint64_t uncompressed_pos, bool final)
 	const enum nicestr_unit unit_min = final ? NICESTR_B : NICESTR_MIB;
 	my_snprintf(&pos, &left, "%s / %s",
 			uint64_to_nicestr(compressed_pos,
-				unit_min, NICESTR_MIB, false, 0),
+				unit_min, NICESTR_TIB, false, 0),
 			uint64_to_nicestr(uncompressed_pos,
-				unit_min, NICESTR_MIB, false, 1));
+				unit_min, NICESTR_TIB, false, 1));
 
 	// Avoid division by zero. If we cannot calculate the ratio, set
 	// it to some nice number greater than 10.0 so that it gets caught
@@ -451,13 +441,13 @@ progress_time(uint64_t useconds)
 }
 
 
-/// Make the string to contain the estimated remaining time, or if the amount
-/// of input isn't known, how much time has elapsed.
+/// Return a string containing estimated remaining time when
+/// reasonably possible.
 static const char *
 progress_remaining(uint64_t in_pos, uint64_t elapsed)
 {
-	// Show the amount of time spent so far when making an estimate of
-	// remaining time wouldn't be reasonable:
+	// Don't show the estimated remaining time when it wouldn't
+	// make sense:
 	//  - Input size is unknown.
 	//  - Input has grown bigger since we started (de)compressing.
 	//  - We haven't processed much data yet, so estimate would be
@@ -466,7 +456,7 @@ progress_remaining(uint64_t in_pos, uint64_t elapsed)
 	//    so estimate would be too inaccurate.
 	if (expected_in_size == 0 || in_pos > expected_in_size
 			|| in_pos < (UINT64_C(1) << 19) || elapsed < 8000000)
-		return progress_time(elapsed);
+		return "";
 
 	// Calculate the estimate. Don't give an estimate of zero seconds,
 	// since it is possible that all the input has been already passed
@@ -530,9 +520,8 @@ progress_remaining(uint64_t in_pos, uint64_t elapsed)
 		snprintf(buf, sizeof(buf), "%" PRIu32 " d", remaining);
 
 	} else {
-		// The estimated remaining time is so big that it's better
-		// that we just show the elapsed time.
-		return progress_time(elapsed);
+		// The estimated remaining time is too big. Don't show it.
+		return "";
 	}
 
 	return buf;
@@ -599,10 +588,11 @@ message_progress_update(void)
 	// Print the actual progress message. The idea is that there is at
 	// least three spaces between the fields in typical situations, but
 	// even in rare situations there is at least one space.
-	fprintf(stderr, "  %7s %43s   %9s   %10s\r",
-		progress_percentage(in_pos, false),
+	fprintf(stderr, "\r %6s %35s   %9s %10s   %10s\r",
+		progress_percentage(in_pos),
 		progress_sizes(compressed_pos, uncompressed_pos, false),
 		progress_speed(uncompressed_pos, elapsed),
+		progress_time(elapsed),
 		progress_remaining(in_pos, elapsed));
 
 #ifdef SIGALRM
@@ -666,7 +656,6 @@ progress_flush(bool finished)
 	progress_active = false;
 
 	const uint64_t elapsed = progress_elapsed();
-	const char *elapsed_str = progress_time(elapsed);
 
 	signals_block();
 
@@ -674,24 +663,24 @@ progress_flush(bool finished)
 	// statistics are printed in the same format as the progress
 	// indicator itself.
 	if (progress_automatic) {
-		// Using floating point conversion for the percentage instead
-		// of static "100.0 %" string, because the decimal separator
-		// isn't a dot in all locales.
-		fprintf(stderr, "  %7s %43s   %9s   %10s\n",
-			progress_percentage(in_pos, finished),
+		fprintf(stderr, "\r %6s %35s   %9s %10s   %10s\n",
+			finished ? "100 %" : progress_percentage(in_pos),
 			progress_sizes(compressed_pos, uncompressed_pos, true),
 			progress_speed(uncompressed_pos, elapsed),
-			elapsed_str);
+			progress_time(elapsed),
+			finished ? "" : progress_remaining(in_pos, elapsed));
 	} else {
 		// The filename is always printed.
 		fprintf(stderr, "%s: ", filename);
 
 		// Percentage is printed only if we didn't finish yet.
-		// FIXME: This may look weird when size of the input
-		// isn't known.
-		if (!finished)
-			fprintf(stderr, "%s, ",
-					progress_percentage(in_pos, false));
+		if (!finished) {
+			// Don't print the percentage when it isn't known
+			// (starts with a dash).
+			const char *percentage = progress_percentage(in_pos);
+			if (percentage[0] != '-')
+				fprintf(stderr, "%s, ", percentage);
+		}
 
 		// Size information is always printed.
 		fprintf(stderr, "%s", progress_sizes(
@@ -702,6 +691,7 @@ progress_flush(bool finished)
 		if (speed[0] != '\0')
 			fprintf(stderr, ", %s", speed);
 
+		const char *elapsed_str = progress_time(elapsed);
 		if (elapsed_str[0] != '\0')
 			fprintf(stderr, ", %s", elapsed_str);