Git.pm: Try to support ActiveState output pipe

The code is stolen from git-annotate and completely untested since
I don't have access to any Microsoft operating system now. Someone
ActiveState-savvy should look at it anyway and try to implement
the input pipe as well, if it is possible at all; also, the implementation
seems to be horribly whitespace-unsafe.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/perl/Git.pm b/perl/Git.pm
index 7bbb5be..6173043 100644 (file)
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -663,18 +663,29 @@ sub _command_common_pipe {
        }
        _check_valid_cmd($cmd);
 
-       my $pid = open(my $fh, $direction);
-       if (not defined $pid) {
-               throw Error::Simple("open failed: $!");
-       } elsif ($pid == 0) {
-               if (defined $opts{STDERR}) {
-                       close STDERR;
-               }
-               if ($opts{STDERR}) {
-                       open (STDERR, '>&', $opts{STDERR})
-                               or die "dup failed: $!";
+       my $fh;
+       if ($^O eq '##INSERT_ACTIVESTATE_STRING_HERE##') {
+               # ActiveState Perl
+               #defined $opts{STDERR} and
+               #       warn 'ignoring STDERR option - running w/ ActiveState';
+               $direction eq '-|' or
+                       die 'input pipe for ActiveState not implemented';
+               tie ($fh, 'Git::activestate_pipe', $cmd, @args);
+
+       } else {
+               my $pid = open($fh, $direction);
+               if (not defined $pid) {
+                       throw Error::Simple("open failed: $!");
+               } elsif ($pid == 0) {
+                       if (defined $opts{STDERR}) {
+                               close STDERR;
+                       }
+                       if ($opts{STDERR}) {
+                               open (STDERR, '>&', $opts{STDERR})
+                                       or die "dup failed: $!";
+                       }
+                       _cmd_exec($self, $cmd, @args);
                }
-               _cmd_exec($self, $cmd, @args);
        }
        return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
 }
@@ -749,4 +760,39 @@ sub AUTOLOAD {
 sub DESTROY { }
 
 
+# Pipe implementation for ActiveState Perl.
+
+package Git::activestate_pipe;
+use strict;
+
+sub TIEHANDLE {
+       my ($class, @params) = @_;
+       # FIXME: This is probably horrible idea and the thing will explode
+       # at the moment you give it arguments that require some quoting,
+       # but I have no ActiveState clue... --pasky
+       my $cmdline = join " ", @params;
+       my @data = qx{$cmdline};
+       bless { i => 0, data => \@data }, $class;
+}
+
+sub READLINE {
+       my $self = shift;
+       if ($self->{i} >= scalar @{$self->{data}}) {
+               return undef;
+       }
+       return $self->{'data'}->[ $self->{i}++ ];
+}
+
+sub CLOSE {
+       my $self = shift;
+       delete $self->{data};
+       delete $self->{i};
+}
+
+sub EOF {
+       my $self = shift;
+       return ($self->{i} >= scalar @{$self->{data}});
+}
+
+
 1; # Famous last words