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#!/usr/bin/perl
use strict;
use warnings;
package IkiWiki::Plugin::highlight;
use IkiWiki '3.00';
use Syntax::Highlight::Engine::Kate;
# variables {{{
my %hl_args = (
substitutions => {
'<' => '<',
'>' => '>',
'&' => '&',
'[' => '[', # wow is this a huge hack
},
format_table => {
Alert => ["<span class='synAlert'>", "</span>"],
BaseN => ["<span class='synBaseN'>", "</span>"],
BString => ["<span class='synBString'>", "</span>"],
Char => ["<span class='synChar'>", "</span>"],
Comment => ["<span class='synComment'>", "</span>"],
DataType => ["<span class='synDataType'>", "</span>"],
DecVal => ["<span class='synDecVal'>", "</span>"],
Error => ["<span class='synError'>", "</span>"],
Float => ["<span class='synFloat'>", "</span>"],
Function => ["<span class='synFunction'>", "</span>"],
IString => ["<span class='synIString'>", "</span>"],
Keyword => ["<span class='synKeyword'>", "</span>"],
Normal => ["", "" ],
Operator => ["<span class='synOperator'>", "</span>"],
Others => ["<span class='synOthers'>", "</span>"],
RegionMarker => ["<span class='synRegionMarker'>", "</span>"],
Reserved => ["<span class='synReserved'>", "</span>"],
String => ["<span class='synString'>", "</span>"],
Variable => ["<span class='synVariable'>", "</span>"],
Warning => ["<span class='synWarning'>", "</span>"],
},
);
my $syntaxes;
# }}}
sub import { # {{{
my $hl = Syntax::Highlight::Engine::Kate->new(%hl_args);
$syntaxes = { map { +lc($_) => $hl->syntaxes->{$_} }
keys %{ $hl->syntaxes } };
$syntaxes->{c} = 'ANSI C89';
$syntaxes->{cpp} = 'C++';
$syntaxes->{ocaml} = 'Objective Caml';
hook(type => 'filter', id => __PACKAGE__, call => \&filter);
} # }}}
sub filter { # {{{
my %args = @_;
my $content = '';
my $code_block = '';
my $in_code = 0;
my $code_re = qr/^(?: {4}|\t)/;
my $empty_re = qr/^\s*$/;
for my $line (split /^/m, $args{content}) {
if ($in_code) {
if ($line =~ $code_re || $line =~ $empty_re) {
$line =~ s/^(?: ? ? ? ?|\t)//;
$code_block .= $line;
}
else {
$code_block =~ s/(\s*)$//;
my $ws = $1;
$content .= highlight($code_block);
$in_code = 0;
$code_block = '';
$content .= $ws;
$content .= $line;
}
}
else {
if ($line =~ $code_re && $line !~ $empty_re) {
$in_code = 1;
$line =~ s/^(?: ? ? ? ?|\t)//;
$code_block .= $line;
}
else {
$content .= $line;
}
}
}
$content .= $code_block;
return $content;
} # }}}
sub highlight { # {{{
my ($code_block) = @_;
my $filetype = guess_filetype($code_block);
return $code_block unless $filetype;
my $hl = Syntax::Highlight::Engine::Kate->new(%hl_args,
language => $filetype);
$code_block =~ s/[^\n]*\n//s;
$filetype =~ s/\s/_/g;
return "<pre><code class='lang$filetype'>" .
$hl->highlightText($code_block) .
'</code></pre>';
} # }}}
sub guess_filetype { # {{{
my ($code_block) = @_;
my ($first_line) = split /\n/, $code_block;
if ($first_line =~ m{^#!\s*(?:.+[\s/]+)*(\w+)}) {
return $syntaxes->{$1};
}
elsif ($first_line =~ m{^[/(]\*\s*(\w+)\s*\*[/)]}) {
return $syntaxes->{$1};
}
elsif ($first_line =~ m{^[-/]{2}\s*(\w+)}) {
return $syntaxes->{$1};
}
elsif ($first_line =~ m{^<!--\s*(\w+)\s*-->}) {
return $syntaxes->{$1};
}
} # }}}
1;
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