Merge branch 'mb/shortlog-nongit-stdin'

* mb/shortlog-nongit-stdin:
  shortlog: warn the user when there is no input

builtin-shortlog.c

@@ -295,6 +295,8 @@ parse_done:
 	if (!nongit && !rev.pending.nr && isatty(0))
 		add_head_to_pending(&rev);
 	if (rev.pending.nr == 0) {
+		if (isatty(0))
+			fprintf(stderr, "(reading log message from standard input)\n");
 		read_from_stdin(&log);
 	}
 	else