#!/usr/local/bin/perl -w
#
# $Id: ptksh+ 475 2014-12-13 03:20:00Z hayashi $
#
# POD documentation after __END__
# This program is contributed by Achim Bohnet. It demonstrates how to
# use the callback functions in the GNU Readline Library. This script
# is essentially equivalent with executing the following lines in
# `eg/perlsh';
# $PerlSh::term->tkRunning(1);
# use Tk;
# $mw = MainWindow->new();
#
# Hiroo Hayashi
require 5.003_92;
use Tk;
# Bug: Require script does not work with all possibilities of
# missing/existing new MainWindow and MainLoop. Therefore
# I have disabled it.
# Mainloop in script would be the end. No readline :-(
#require shift @ARGV if (@ARGV);
package Tk::RL;
use Tk;
use Term::ReadLine;
$name = 'ptksh+';
$mw = MainWindow->new() unless ($mw = Tk::Exists 'MainWindow');
$mw->title($name);
$mw->iconname($name);
$mw->protocol('WM_DELETE_WINDOW' => \&quit);
##### Gnu Readline Stuff #####
my $term = new Term::ReadLine $name;
my $attribs = $term->Attribs;
$term->callback_handler_install("$name> ", \&doline);
$mw->fileevent(STDIN,'readable',
$attribs->{callback_read_char});
sub quit {
$mw->fileevent(STDIN,'readable','');
$term->callback_handler_remove();
$mw->destroy;
}
my $outstream = $attribs->{outstream};
sub doline {
my $line = shift;
if (defined $line) {
if ($line =~ /^p\s(.*)$/) {
$line = "print $1, \"!\\n\";";
}
eval "{package main; $line }";
print $outstream "$@\n" if $@;
$term->add_history($line) if $line ne "";
$attribs->{line_buffer} = ''; # needed for eval errors
} else {
quit() unless defined $line;
}
}
# To test if Tk is not blocked: Tk::RL::tk_active<return>
sub tk_active {
print STDERR "I'm working behing the scene\n";
$mw->after(1500,\&tk_active);
}
#$mw->after(1500,\&tk_active);
package main;
# be gentle if 'required' script defined $mw;
$mw = $Tk::RL::mw if not defined $mw;
MainLoop;
print "\n";
__END__
=head1 NAME
ptksh+ - Simple perl/Tk shell that uses the Gnu Readline features
=head1 SYNOPSIS
% ptksh+
ptksh+> $b=$mw->Button(-text=>'hello',-command=>sub{print STDERR 'hello'})
ptksh+> $b->pack;
ptksh+> ...
ptksh+> ^D
%
=head1 DESCRIPTION
This (very) simple perl/Tk shell allows you to enter perl/Tk commands
interactively.
Additionally it supports command line editing and keeps a history
of previously entered commands. It requires C<Term-Readline-Gnu>
to be installed.
You can exit ptksh+ with ^D or using your Window Manager 'Close'
item.
=head1 SEE ALSO
Term::Readline, Term::Readline::Gnu, Tk, perldebug
=head1 AUTHOR
Achim Bohnet <F<ach@mpe.mpg.de>>, URL:L<http://www.xray.mpe.mpg.de/~ach/>
Copyright (c) 1996-1997 Achim Bohnet. All rights reserved. This program
is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
=cut