[PATCH 1/2] add--interactive: handle EOF in prompt_yesno

[Jeff King <peff@peff.net>]

The prompt_yesno function loops indefinitely waiting for a
"y" or "n" response. But it doesn't handle EOF, meaning
that we can end up in an infinite loop of reading EOF from
stdin. One way to simulate that is with:

  echo e | GIT_EDITOR='echo corrupt >' git add -p

Let's break out of the loop and propagate the undef to the
caller. Without modifying the callers that effectively turns
it into a "no" response. This is reasonable for both of the
current callers, and it leaves room for any future caller to
check for undef explicitly.

Signed-off-by: Jeff King <peff@peff.net>
---
 git-add--interactive.perl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 79d675b5b..fc722fe8a 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1136,6 +1136,7 @@ sub prompt_yesno {
 	while (1) {
 		print colored $prompt_color, $prompt;
 		my $line = prompt_single_character;
+		return undef unless defined $line;
 		return 0 if $line =~ /^n/i;
 		return 1 if $line =~ /^y/i;
 	}
-- 
2.13.1.792.g159074dab