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|
package Tk::IO;
use strict;
use vars qw($VERSION);
$VERSION = '4.005'; # $Id: //depot/Tkutf8/IO/IO.pm#4 $
require 5.002;
use Tk::Event qw($XS_VERSION);
use Carp;
use base qw(DynaLoader IO::Handle);
bootstrap Tk::IO;
my %fh2obj;
my %obj2fh;
sub new
{
my ($package,%args) = @_;
# Do whatever IO::Handle does
my $fh = $package->SUPER::new;
%{*$fh} = (); # The hash is used for configure options
${*$fh} = ''; # The scalar is used as the 'readable' buffer
@{*$fh} = (); # The array
$fh->configure(%args);
return $fh;
}
sub pending
{
my $fh = shift;
return ${*$fh};
}
sub cget
{
my ($fh,$key) = @_;
return ${*$fh}{$key};
}
sub configure
{
my ($fh,%args) = @_;
my $key;
foreach $key (keys %args)
{
my $val = $args{$key};
$val = Tk::Callback->new($val) if ($key =~ /command$/);
${*$fh}{$key} = $val;
}
}
sub killpg
{
my ($fh,$sig) = @_;
my $pid = $fh->pid;
croak 'No child' unless (defined $pid);
kill($sig,-$pid);
}
sub kill
{
my ($fh,$sig) = @_;
my $pid = $fh->pid;
croak 'No child' unless (defined $pid);
kill($sig,$pid) || croak "Cannot kill($sig,$pid):$!";
}
sub readable
{
my $fh = shift;
my $count = sysread($fh,${*$fh},1,length(${*$fh}));
if ($count < 0)
{
if (exists ${*$fh}{-errorcommand})
{
${*$fh}{-errorcommand}->Call($!);
}
else
{
warn "Cannot read $fh:$!";
$fh->close;
}
}
elsif ($count)
{
if (exists ${*$fh}{-linecommand})
{
my $eol = index(${*$fh},"\n");
if ($eol >= 0)
{
my $line = substr(${*$fh},0,++$eol);
substr(${*$fh},0,$eol) = '';
${*$fh}{-linecommand}->Call($line);
}
}
}
else
{
$fh->close;
}
}
sub pid
{
my $fh = shift;
return ${*$fh}{-pid};
}
sub command
{
my $fh = shift;
my $cmd = ${*$fh}{'-exec'};
return (wantarray) ? @$cmd : $cmd;
}
sub exec
{
my $fh = shift;
my $pid = open($fh,'-|');
if ($pid)
{
${*$fh} = '' unless (defined ${*$fh});
${*$fh}{'-exec'} = [@_];
${*$fh}{'-pid'} = $pid;
if (exists ${*$fh}{-linecommand})
{
my $w = ${*$fh}{-widget};
$w = 'Tk' unless (defined $w);
$w->fileevent($fh,'readable',[$fh,'readable']);
${*$fh}{_readable} = $w;
}
else
{
require Tk::Pretty;
croak Tk::Pretty::Pretty(\%{*$fh});
}
return $pid;
}
else
{
# make STDERR same as STDOUT here
setpgrp;
exec(@_) || die 'Cannot exec ',join(' ',@_),":$!";
}
}
sub wait
{
my $fh = shift;
my $code;
my $ch = delete ${*$fh}{-childcommand};
${*$fh}{-childcommand} = Tk::Callback->new(sub { $code = shift });
Tk::Event::DoOneEvent(0) until (defined $code);
if (defined $ch)
{
${*$fh}{-childcommand} = $ch;
$ch->Call($code,$fh)
}
return $code;
}
sub close
{
my $fh = shift;
my $code;
if (defined fileno($fh))
{
my $w = delete ${*$fh}{_readable};
$w->fileevent($fh,'readable','') if (defined $w);
$code = close($fh);
if (exists ${*$fh}{-childcommand})
{
${*$fh}{-childcommand}->Call($?,$fh);
}
}
return $code;
}
1;
__END__
|
