shortlog: warn the user when there is no input

A simple "git shortlog" outside of a git repository stalls
waiting for an input. Check if that's the case by testing with
isatty() before read_from_stdin(), and warn the user like
"git commit" does in a similar case.

Signed-off-by: Michele Ballabio <barra_cuda@katamail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-shortlog.c b/builtin-shortlog.c
index b3b055f68ce59b6b91ef6949bd8c4bd0bed68b55..22668b4d3d01d112b185fba8ae7b3a4a6948b4cf 100644 (file)
--- a/builtin-shortlog.c
+++ b/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