am: teach mercurial patch parser how to read from stdinpt/am-foreign

git-mailsplit, which splits mbox patches, will read the patch from stdin
when the filename is "-" or there are no files listed on the
command-line.

To be consistent with this behavior, teach the mercurial patch parser to
read from stdin if the filename is "-" or no files are listed on the
command-line.

Based-on-patch-by: Chris Packham <judge.packham@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/git-am.sh b/git-am.sh
index 5eec11d5f0..f35710cb50 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -327,6 +327,7 @@ split_patches () {
 		;;
 	hg)
 		this=0
+		test 0 -eq "$#" && set -- -
 		for hg in "$@"
 		do
 			this=$(( $this + 1 ))
@@ -353,7 +354,7 @@ split_patches () {
 					print "\n", $_ ;
 					$subject = 1;
 				}
-			' <"$hg" >"$dotest/$msgnum" || clean_abort
+			' -- "$hg" >"$dotest/$msgnum" || clean_abort
 		done
 		echo "$this" >"$dotest/last"
 		this=