git-svn, perl/Git.pm: add central method for prompting passwords

diff --git a/perl/Git.pm b/perl/Git.pm
index 497f420178a73061901393f8c21a9feb17054b6d..72e93c7e1b938f1909056a51646781ace26e06f2 100644 (file)
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -58,7 +58,7 @@ =head1 SYNOPSIS
                 command_output_pipe command_input_pipe command_close_pipe
                 command_bidi_pipe command_close_bidi_pipe
                 version exec_path html_path hash_object git_cmd_try
-                remote_refs
+                remote_refs prompt
                 temp_acquire temp_release temp_reset temp_path);
 
 
@@ -511,6 +511,49 @@ sub version {
 
 sub html_path { command_oneline('--html-path') }
 
+=item prompt ( PROMPT )
+
+Query user C<PROMPT> and return answer from user.
+
+Honours GIT_ASKPASS environment variable for querying
+the user. If no GIT_ASKPASS variable is set or an error occoured,
+the terminal is tried as a fallback.
+
+=cut
+
+sub prompt {
+       my ($prompt) = @_;
+       my $ret;
+       if (exists $ENV{'GIT_ASKPASS'}) {
+               $ret = _prompt($ENV{'GIT_ASKPASS'}, $prompt);
+       }
+       if (!defined $ret) {
+               print STDERR $prompt;
+               STDERR->flush;
+               require Term::ReadKey;
+               Term::ReadKey::ReadMode('noecho');
+               $ret = '';
+               while (defined(my $key = Term::ReadKey::ReadKey(0))) {
+                       last if $key =~ /[\012\015]/; # \n\r
+                       $ret .= $key;
+               }
+               Term::ReadKey::ReadMode('restore');
+               print STDERR "\n";
+               STDERR->flush;
+       }
+       return $ret;
+}
+
+sub _prompt {
+       my ($askpass, $prompt) = @_;
+       return unless length $askpass;
+       my $ret;
+       open my $fh, "-|", $askpass, $prompt or return;
+       $ret = <$fh>;
+       $ret =~ s/[\015\012]//g; # strip \r\n, chomp does not work on all systems (i.e. windows) as expected
+       close ($fh);
+       return $ret;
+}
 
 =item repo_path ()