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#!/usr/bin/perl
package IkiWiki::Plugin::toggle;
use warnings;
use strict;
use IkiWiki;
# Here's the javascript that makes this possible. A key feature is the use
# of css to hide toggleables, to avoid any flashing on page load. The css
# is only emitted after the javascript tests that it's going to be able to
# show the toggleables.
my $javascript=<<'EOF';
<script type="text/javascript">
<!--
if (document.getElementById && document.getElementsByTagName && document.createTextNode) {
document.write('<style type="text/css">div.toggleable { display: none; }</style>');
window.onload = inittoggle;
}
function inittoggle() {
var as = getElementsByClass('toggle');
for (var i = 0; i < as.length; i++) {
var id = as[i].href.match(/#(\w.+)/)[1];
document.getElementById(id).style.display="none";
as[i].onclick = function() {
toggle(this);
return false;
}
}
}
function toggle(s) {
var id = s.href.match(/#(\w.+)/)[1];
style = document.getElementById(id).style;
if (style.display == "none")
style.display = "block";
else
style.display = "none";
}
function getElementsByClass(class) {
var ret = new Array();
var pattern = new RegExp("(^|\\s)"+class+"(\\s|$)");
var els = document.getElementsByTagName('*');
for (i = 0, j = 0; i < els.length; i++) {
if ( pattern.test(els[i].className) ) {
ret[j] = els[i];
j++;
}
}
return ret;
}
//-->
</script>
EOF
sub import { #{{{
hook(type => "preprocess", id => "toggle",
call => \&preprocess_toggle);
hook(type => "preprocess", id => "toggleable",
call => \&preprocess_toggleable);
hook(type => "format", id => "toggle", call => \&format);
} # }}}
sub genid ($$) { #{{{
my $page=shift;
my $id=shift;
$id="$page.$id";
# make it a legal html id attribute
$id=~s/[^-a-zA-Z0-9.]/-/g;
if ($id !~ /^[a-zA-Z]/) {
$id="id$id";
}
return $id;
} #}}}
sub preprocess_toggle (@) { #{{{
my %params=(id => "default", text => "more", @_);
my $id=genid($params{page}, $params{id});
return "<a class=\"toggle\" href=\"#$id\">$params{text}</a>";
} # }}}
sub preprocess_toggleable (@) { #{{{
my %params=(id => "default", text => "", @_);
# Preprocess the text to expand any preprocessor directives
# embedded inside it.
$params{text}=IkiWiki::preprocess($params{page}, $params{destpage},
IkiWiki::filter($params{page}, $params{text}));
my $id=genid($params{page}, $params{id});
# Should really be a postprocessor directive, oh well. Work around
# markdown's dislike of markdown inside a <div> with various funky
# whitespace.
my ($indent)=$params{text}=~/( +)$/;
$indent="" unless defined $indent;
return "<div class=\"toggleable\" id=\"$id\"></div>\n\n$params{text}\n$indent<div class=\"toggleableend\"></div>";
} # }}}
sub format (@) { #{{{
my %params=@_;
if ($params{content}=~s!(<div class="toggleable" id="[^"]+">)</div>!$1!g) {
$params{content}=~s/<div class="toggleableend">//g;
$params{content}=~s!^<\/body>!$javascript</body>!m;
}
return $params{content};
} # }}}
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