#!/usr/bin/perl --
use strict;
use warnings;
use Path::Tiny qw/ path /;
use Tk;
GoTk( @ARGV );
exit( 0 );
sub GoTk {
    my( $file ) = @_;
    my %vars  = (
        pack  => [qw/ -expand 1 -fill both /],
        label => 'the label '.gmtime. ' ',
        text  => 'the text  '.gmtime. ' ',
        LoadSaved( $file ), 
    );
    my $mw = tkinit;
    $mw->Label( -text => $vars{label} )->pack( @{ $vars{pack} } );
    $mw->Entry( -text => $vars{text} )->pack( @{ $vars{pack} } );
    $mw->protocol('WM_DELETE_WINDOW',
    sub {
        eval {
            SaveLoaded(
                $file, {
                    %vars,
                    label => Chaild($mw, 'label')->cget(-text),
                    text  => Chaild($mw, 'Entry')->cget(-text),
            });
        1 } or warn $@;
        Tk::exit;
    });
    $mw->MainLoop;
}
sub Chaild {
    my( $w, $class ) = @_;
    for my $kid ( $w->children ){
        return $kid if ref($kid) =~ /\Q$class\E/i;
    }
    return;
}
sub SaveLoaded {
    my( $file , $vars ) = @_;
    path( $file )->spew_raw(
        map {
            my $k = $_;
            my $v = $vars->{$k};
            $v = sprintf "qw' %s '", join ' ' , @$v if ref $v;
            "$k=$v\n"
        } keys %$vars
    );
}
sub LoadSaved {
    my %stuff;
    local $@;
    for my $line ( eval { path(@_)->lines_raw   } ){
        $line =~ s/[\r\n]+$//;
        my( $key, $val ) = split /=/, $line, 2;
        next unless $key and $val;
        $val = [split ' ', $1] if $val =~ m{qw'(.*)'};
        $stuff{$key}=$val;
    }
    warn $@ if $@;
    return %stuff;
}
__END__