IkiWiki/Plugin/sparkline.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::sparkline;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 3.00;
   7 use IPC::Open2;
   8
   9 my $match_num=qr/[-+]?[0-9]+(?:\.[0-9]+)?/;
  10 my %locmap=(
  11         top => 'TEXT_TOP',
  12         right => 'TEXT_RIGHT',
  13         bottom => 'TEXT_BOTTOM',
  14         left => 'TEXT_LEFT',
  15 );
  16
  17 sub import {
  18         hook(type => "getsetup", id => "sparkline", call => \&getsetup);
  19         hook(type => "preprocess", id => "sparkline", call => \&preprocess);
  20 }
  21
  22 sub getsetup () {
  23         return
  24                 plugin => {
  25                         safe => 1,
  26                         rebuild => undef,
  27                         section => "widget",
  28                 },
  29 }
  30
  31 sub preprocess (@) {
  32         my %params=@_;
  33
  34         my $php;
  35
  36         my $style=(exists $params{style} && $params{style} eq "bar") ? "Bar" : "Line";
  37         $php=qq{<?php
  38                 require_once('sparkline/Sparkline_$style.php');
  39                 \$sparkline = new Sparkline_$style();
  40                 \$sparkline->SetDebugLevel(DEBUG_NONE);
  41         };
  42
  43         foreach my $param (qw{BarWidth BarSpacing YMin YMaz}) {
  44                 if (exists $params{lc($param)}) {
  45                         $php.=qq{\$sparkline->Set$param(}.int($params{lc($param)}).qq{);\n};
  46                 }
  47         }
  48
  49         my $c=0;
  50         while (@_) {
  51                 my $key=shift;
  52                 my $value=shift;
  53
  54                 if ($key=~/^($match_num)(?:,($match_num))?(?:\(([a-z]+)\))?$/) {
  55                         $c++;
  56                         my ($x, $y);
  57                         if (defined $2) {
  58                                 $x=$1;
  59                                 $y=$2;
  60                         }
  61                         else {
  62                                 $x=$c;
  63                                 $y=$1;
  64                         }
  65                         if ($style eq "Bar" && defined $3) {
  66                                 $php.=qq{\$sparkline->SetData($x, $y, '$3');\n};
  67                         }
  68                         else {
  69                                 $php.=qq{\$sparkline->SetData($x, $y);\n};
  70                         }
  71                 }
  72                 elsif (! length $value) {
  73                         error gettext("parse error")." \"$key\"";
  74                 }
  75                 elsif ($key eq 'featurepoint') {
  76                         my ($x, $y, $color, $diameter, $text, $location)=
  77                                 split(/\s*,\s*/, $value);
  78                         if (! defined $diameter || $diameter < 0) {
  79                                 error gettext("invalid featurepoint diameter");
  80                         }
  81                         $x=int($x);
  82                         $y=int($y);
  83                         $color=~s/[^a-z]+//g;
  84                         $diameter=int($diameter);
  85                         $text=~s/[^-a-zA-Z0-9]+//g if defined $text;
  86                         if (defined $location) {
  87                                 $location=$locmap{$location};
  88                                 if (! defined $location) {
  89                                         error gettext("invalid featurepoint location");
  90                                 }
  91                         }
  92                         $php.=qq{\$sparkline->SetFeaturePoint($x, $y, '$color', $diameter};
  93                         $php.=qq{, '$text'} if defined $text;
  94                         $php.=qq{, $location} if defined $location;
  95                         $php.=qq{);\n};
  96                 }
  97         }
  98
  99         if ($c eq 0) {
 100                 error gettext("missing values");
 101         }
 102
 103         my $height=int($params{height} || 20);
 104         if ($height < 2 || $height > 100) {
 105                 error gettext("invalid height value");
 106         }
 107         if ($style eq "Bar") {
 108                 $php.=qq{\$sparkline->Render($height);\n};
 109         }
 110         else {
 111                 if (! exists $params{width}) {
 112                         error gettext("missing width parameter");
 113                 }
 114                 my $width=int($params{width});
 115                 if ($width < 2 || $width > 1024) {
 116                         error gettext("invalid width value");
 117                 }
 118                 $php.=qq{\$sparkline->RenderResampled($width, $height);\n};
 119         }
 120
 121         $php.=qq{\$sparkline->Output();\n?>\n};
 122
 123         # Use the sha1 of the php code that generates the sparkline as
 124         # the base for its filename.
 125         eval q{use Digest::SHA};
 126         error($@) if $@;
 127         my $fn=$params{page}."/sparkline-".
 128                 IkiWiki::possibly_foolish_untaint(Digest::SHA::sha1_hex($php)).
 129                 ".png";
 130         will_render($params{page}, $fn);
 131
 132         if (! -e "$config{destdir}/$fn") {
 133                 my $pid;
 134                 my $sigpipe=0;
 135                 $SIG{PIPE}=sub { $sigpipe=1 };
 136                 $pid=open2(*IN, *OUT, "php");
 137
 138                 # open2 doesn't respect "use open ':utf8'"
 139                 binmode (OUT, ':utf8');
 140
 141                 print OUT $php;
 142                 close OUT;
 143
 144                 my $png;
 145                 {
 146                         local $/=undef;
 147                         $png=<IN>;
 148                 }
 149                 close IN;
 150
 151                 waitpid $pid, 0;
 152                 $SIG{PIPE}="DEFAULT";
 153                 if ($sigpipe || ! defined $png) {
 154                         error gettext("failed to run php");
 155                 }
 156
 157                 if (! $params{preview}) {
 158                         writefile($fn, $config{destdir}, $png, 1);
 159                 }
 160                 else {
 161                         # in preview mode, embed the image in a data uri
 162                         # to avoid temp file clutter
 163                         eval q{use MIME::Base64};
 164                         error($@) if $@;
 165                         return "<img src=\"data:image/png;base64,".
 166                                 encode_base64($png)."\" />";
 167                 }
 168         }
 169
 170         return '<img src="'.urlto($fn, $params{destpage}).'" alt="graph" />';
 171 }
 172
 173 1