[PATCH v5 1/2] git-contacts: allow inputting patch via stdin

[Brigham Campbell <me@brighamcampbell.com>]

Make git-contacts accept patch contents via stdin for better
interoperability with other utilities. Read from stdin when the user
passes `-` at least once:

$ git contacts - <patch

Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---
 contrib/contacts/git-contacts | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
index 85ad732fc0..df7b920d9e 100755
--- a/contrib/contacts/git-contacts
+++ b/contrib/contacts/git-contacts
@@ -162,9 +162,11 @@ if (!@ARGV) {
 	die "No input revisions or patch files\n";
 }
 
-my (@files, @rev_args);
+my ($read_from_stdin, @files, @rev_args);
 for (@ARGV) {
-	if (-e) {
+	if ($_ eq '-') {
+		$read_from_stdin = 1;
+	} elsif (-e) {
 		push @files, $_;
 	} else {
 		push @rev_args, $_;
@@ -172,6 +174,9 @@ for (@ARGV) {
 }
 
 my %sources;
+if ($read_from_stdin) {
+	scan_patches(\%sources, undef, \*STDIN);
+}
 for (@files) {
 	scan_patch_file(\%sources, $_);
 }

-- 
2.55.0