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lib/App/Basis/ConvertText2/Plugin/Ditaa.pm  view on Meta::CPAN

=head1 NAME

App::Basis::ConvertText2::Plugin::Ditaa

=head1 SYNOPSIS

    my $content = "+--------+   +-------+    +-------+
    |        | --+ ditaa +--> |       |
    |  Text  |   +-------+    |diagram|
    |Document|   |!magic!|    |       |
    |     {d}|   |       |    |       |
    +---+----+   +-------+    +-------+
        :                         ^
        |       Lots of work      |
        \-------------------------+
    " ;
    my $params = { 
        size   => "600x480",
    } ;
    my $obj = App::Basis::ConvertText2::Plugin::Ditaa->new() ;
    my $out = $obj->process( 'ditaa', $content, $params) ;
 
=head1 DESCRIPTION

convert a ditaa text string into a PNG, requires ditaa program from http://ditaa.sourceforge.net/

=cut

# ----------------------------------------------------------------------------

package App::Basis::ConvertText2::Plugin::Ditaa;
$App::Basis::ConvertText2::Plugin::Ditaa::VERSION = '0.4';
use 5.10.0;
use strict;
use warnings;
use Path::Tiny;
use App::Basis;
use Moo;
use App::Basis;
use App::Basis::ConvertText2::Support;
use namespace::autoclean;

has handles => (
    is       => 'ro',
    init_arg => undef,
    default  => sub { [qw{ditaa}] }
);

use constant DITAA => 'ditaa';

# ----------------------------------------------------------------------------

=item ditaa

create a simple ditaa image

 parameters
    data   - ditaa text      
    filename - filename to save the created image as 

 hashref params of
        size    - size of image, widthxheight - optional

=cut

sub process {
    my $self = shift;
    my ( $tag, $content, $params, $cachedir ) = @_;
    $params->{size} ||= "";
    my ( $x, $y ) = ( $params->{size} =~ /^\s*(\d+)\s*x\s*(\d+)\s*$/ );

    # strip any ending linefeed
    chomp $content;
    return "" if ( !$content );

    # we can use the cache or process everything ourselves
    my $sig = create_sig( $content, $params );
    my $filename = cachefile( $cachedir, "$sig.png" );
    if ( !-f $filename ) {

        my $ditaafile = Path::Tiny->tempfile("ditaa.XXXX");

        path($ditaafile)->spew_utf8($content);

        my $cmd = DITAA . " -o $ditaafile $filename";
        my ( $exit, $stdout, $stderr ) = run_cmd($cmd);
        if ($exit) {
            warn "Could not run script " . DITAA . " get it from http://ditaa.sourceforge.net/";
        }

        # if we want to force the size of the graph
        if ( -f $filename && $x && $y ) {
            my $image = Image::Resize->new($filename);
            my $gd = $image->resize( $x, $y );

            # overwrite original file with resized version
            if ($gd) {
                path($filename)->spew_raw( $gd->png );
            }
        }
    }