IkiWiki/Plugin/polygen.pm



#!/usr/bin/perl
#
# Include polygen output in a page
# 
# by Enrico Zini
package IkiWiki::Plugin::polygen;

use warnings;
use strict;
use IkiWiki;
use File::Find;

sub import { #{{{
    IkiWiki::hook(type => "preprocess", id => "polygen",
        call => \&preprocess);
} # }}}

sub preprocess (@) { #{{{
    my %params=@_;
    my $grammar = ($params{grammar} or 'polygen');
    my $symbol = ($params{symbol} or undef);

    # Sanitize parameters
    $grammar =~ IkiWiki::basename($grammar);
    $grammar =~ s/\.grm$//;
    $grammar .= '.grm';
    $symbol =~ s/[^A-Za-z0-9]//g if defined $symbol;
    $symbol = IkiWiki::possibly_foolish_untaint($symbol) if defined $symbol;

    my $grmfile = '/usr/share/polygen/ita/polygen.grm';
    if (! -d '/usr/share/polygen') {
        return "[[polygen not installed]]";
    }
    find({wanted => sub {
            if (substr($File::Find::name, -length($grammar)) eq $grammar) {
                $grmfile = IkiWiki::possibly_foolish_untaint($File::Find::name);
            }
        },
        no_chdir => 1,
    }, '/usr/share/polygen');
    
    my $res;
    if (defined $symbol) {
        $res = `polygen -S $symbol $grmfile 2>/dev/null`;
    }
    else {
        $res = `polygen $grmfile 2>/dev/null`;
    }

    if ($?) {
        $res="[[polygen failed]]";
    }

    # Strip trainling spaces and newlines so that we flow well with the
    # markdown text
    $res =~ s/\s*$//;
    return $res;
} # }}}

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