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add -p: avoid use of undefined $key when ReadKey -> EOF 

b5cc003253 (add -i: ignore terminal escape sequences, 2011-05-17)
add an additional check to the original code to better handle keys
for escape sequences, but failed to account for the possibility
the first ReadKey call returned undef (ex: stdin closes) and that
was being handled fine by the original code in ca6ac7f135 (add -p:
prompt for single characters, 2009-02-05)

Add a test for undefined and encapsulate the loop and the original
print that relied on it within it.

After this, the following command (in a suitable repository state)
wouldn't print any error:

  $ git -c interactive.singleKey add -p </dev/null

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Carlo Marcelo Arenas Belón 2021-11-28 09:49:03 -08:00 committed by Junio C Hamano
parent 94f6e3e283
commit fc8a8126df
1 changed files with 9 additions and 7 deletions
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16
git-add--interactive.perl
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@ -1175,15 +1175,17 @@ sub prompt_single_character {
ReadMode 'cbreak';
my $key = ReadKey 0;
ReadMode 'restore';
if ($use_termcap and $key eq "\e") {
while (!defined $term_escapes{$key}) {
my $next = ReadKey 0.5;
last if (!defined $next);
$key .= $next;
if (defined $key) {
if ($use_termcap and $key eq "\e") {
while (!defined $term_escapes{$key}) {
my $next = ReadKey 0.5;
last if (!defined $next);
$key .= $next;
}
$key =~ s/\e/^[/;
}
$key =~ s/\e/^[/;
print "$key";
}
print "$key" if defined $key;
print "\n";
return $key;
} else {