path: root/IkiWiki/Plugin/postsparkline.pm

#!/usr/bin/perl
package IkiWiki::Plugin::postsparkline;

use warnings;
use strict;
use IkiWiki 2.00;

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

sub preprocess (@) { #{{{
    my %params=@_;

    if (! exists $params{max}) {
        $params{max}=100;
    }

    if (! exists $params{pages}) {
        return "";
    }

    if (! exists $params{time} || $params{time} ne 'mtime') {
        $params{timehash} = \%IkiWiki::pagectime;
    }
    else {
        $params{timehash} = \%IkiWiki::pagemtime;
    }

    if (! exists $params{formula}) {
        error gettext("missing formula")
    }
    my $formula=$params{formula};
    $formula=~s/[^a-zA-Z0-9]*//g;
    $formula=IkiWiki::possibly_foolish_untaint($formula);
    if (! length $formula ||
        ! IkiWiki::Plugin::postsparkline::formula->can($formula)) {
        error gettext("unknown formula");
    }

    add_depends($params{page}, $params{pages});

    my @list;
    foreach my $page (keys %pagesources) {
        next if $page eq $params{page};
        if (pagespec_match($page, $params{pages}, location => $params{page})) {
            push @list, $page;
        }
    }
    
    @list = sort { $params{timehash}->{$b} <=> $params{timehash}->{$a} } @list;

    my @data=eval qq{IkiWiki::Plugin::postsparkline::formula::$formula(\\\%params, \@list)};
    if ($@) {
        error $@;
    }

    if (! @data) {
        # generate an empty graph
        push @data, 0 foreach 1..($params{max} / 2);
    }

    my $color=exists $params{color} ? "($params{color})" : "";

    delete $params{pages};
    delete $params{formula};
    delete $params{ftime};
    delete $params{color};
    return IkiWiki::Plugin::sparkline::preprocess(%params, 
        map { $_.$color => "" } reverse @data);
} # }}}

sub perfoo ($@) {
    my $sub=shift;
    my $params=shift;
    
    my $max=$params->{max};
    my ($first, $prev, $cur);
    my $count=0;
    my @data;
    foreach (@_) {
        $cur=$sub->($params->{timehash}->{$_});
        if (defined $prev) {
            if ($prev != $cur) {
                push @data, "$prev,$count";
                $count=0;
                last if --$max <= 0;

                for ($cur+1 .. $prev-1) {
                    push @data, "$_,0";
                    last if --$max == 0;
                }
            }
        }
        else {
            $first=$cur;
        }
        $count++;
        $prev=$cur;
    }

    return @data;
}

package IkiWiki::Plugin::postsparkline::formula;

sub peryear (@) {
    return IkiWiki::Plugin::postsparkline::perfoo(sub {
        return (localtime $_[0])[5];
    }, @_);
}

sub permonth (@) {
    return IkiWiki::Plugin::postsparkline::perfoo(sub {
        my ($month, $year)=(localtime $_[0])[4,5];
        return $year*12+$month;
    }, @_);
}

sub perday (@) {
    return IkiWiki::Plugin::postsparkline::perfoo(sub {
        my ($year, $yday)=(localtime $_[0])[5,7];
        return $year*365+$yday;
    }, @_);
}

sub interval ($@) {
    my $params=shift;

    my $max=$params->{max};
    my @data;
    for (my $i=1; $i < @_; $i++) {
        push @data, $params->{timehash}->{$_[$i-1]} - $params->{timehash}->{$_[$i]};
        last if --$max <= 0;
    }
    return @data;
}

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