IkiWiki/Plugin/sparkline.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::sparkline;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 2.00;
   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 => "preprocess", id => "sparkline", call => \&preprocess);
  19 } # }}}
  20
  21 sub preprocess (@) { #{{{
  22         my %params=@_;
  23
  24         my $php;
  25
  26         my $style=(exists $params{style} && $params{style} eq "bar") ? "Bar" : "Line";
  27         $php=qq{<?php
  28                 require_once('sparkline/Sparkline_$style.php');
  29                 \$sparkline = new Sparkline_$style();
  30                 \$sparkline->SetDebugLevel(DEBUG_NONE);
  31         };
  32
  33         foreach my $param (qw{BarWidth BarSpacing YMin YMaz}) {
  34                 if (exists $params{lc($param)}) {
  35                         $php.=qq{\$sparkline->Set$param(}.int($params{lc($param)}).qq{);\n};
  36                 }
  37         }
  38
  39         my $c=0;
  40         while (@_) {
  41                 my $key=shift;
  42                 my $value=shift;
  43
  44                 if ($key=~/^($match_num)(?:,($match_num))?(?:\(([a-z]+)\))?$/) {
  45                         $c++;
  46                         my ($x, $y);
  47                         if (defined $2) {
  48                                 $x=$1;
  49                                 $y=$2;
  50                         }
  51                         else {
  52                                 $x=$c;
  53                                 $y=$1;
  54                         }
  55                         if ($style eq "Bar" && defined $3) {
  56                                 $php.=qq{\$sparkline->SetData($x, $y, '$3');\n};
  57                         }
  58                         else {
  59                                 $php.=qq{\$sparkline->SetData($x, $y);\n};
  60                         }
  61                 }
  62                 elsif (! length $value) {
  63                         error gettext("parse error")." \"$key\"";
  64                 }
  65                 elsif ($key eq 'featurepoint') {
  66                         my ($x, $y, $color, $diameter, $text, $location)=
  67                                 split(/\s*,\s*/, $value);
  68                         if (! defined $diameter || $diameter < 0) {
  69                                 error gettext("bad featurepoint diameter");
  70                         }
  71                         $x=int($x);
  72                         $y=int($y);
  73                         $color=~s/[^a-z]+//g;
  74                         $diameter=int($diameter);
  75                         $text=~s/[^-a-zA-Z0-9]+//g if defined $text;
  76                         if (defined $location) {
  77                                 $location=$locmap{$location};
  78                                 if (! defined $location) {
  79                                         error gettext("bad featurepoint location");
  80                                 }
  81                         }
  82                         $php.=qq{\$sparkline->SetFeaturePoint($x, $y, '$color', $diameter};
  83                         $php.=qq{, '$text'} if defined $text;
  84                         $php.=qq{, $location} if defined $location;
  85                         $php.=qq{);\n};
  86                 }
  87         }
  88
  89         if ($c eq 0) {
  90                 error gettext("missing values");
  91         }
  92
  93         my $height=int($params{height} || 20);
  94         if ($height < 2 || $height > 100) {
  95                 error gettext("bad height value");
  96         }
  97         if ($style eq "Bar") {
  98                 $php.=qq{\$sparkline->Render($height);\n};
  99         }
 100         else {
 101                 if (! exists $params{width}) {
 102                         error gettext("missing width parameter");
 103                 }
 104                 my $width=int($params{width});
 105                 if ($width < 2 || $width > 1024) {
 106                         error gettext("bad width value");
 107                 }
 108                 $php.=qq{\$sparkline->RenderResampled($width, $height);\n};
 109         }
 110
 111         $php.=qq{\$sparkline->Output();\n?>\n};
 112
 113         # Use the sha1 of the php code that generates the sparkline as
 114         # the base for its filename.
 115         eval q{use Digest::SHA1};
 116         error($@) if $@;
 117         my $fn=$params{page}."/sparkline-".
 118                 IkiWiki::possibly_foolish_untaint(Digest::SHA1::sha1_hex($php)).
 119                 ".png";
 120         will_render($params{page}, $fn);
 121
 122         if (! -e "$config{destdir}/$fn") {
 123                 my $pid;
 124                 my $sigpipe=0;;
 125                 $SIG{PIPE}=sub { $sigpipe=1 };
 126                 $pid=open2(*IN, *OUT, "php");
 127
 128                 # open2 doesn't respect "use open ':utf8'"
 129                 binmode (OUT, ':utf8');
 130
 131                 print OUT $php;
 132                 close OUT;
 133
 134                 my $png;
 135                 {
 136                         local $/=undef;
 137                         $png=<IN>;
 138                 }
 139                 close IN;
 140
 141                 waitpid $pid, 0;
 142                 $SIG{PIPE}="DEFAULT";
 143                 if ($sigpipe) {
 144                         error gettext("failed to run php");
 145                 }
 146
 147                 if (! $params{preview}) {
 148                         writefile($fn, $config{destdir}, $png, 1);
 149                 }
 150                 else {
 151                         # can't write the file, so embed it in a data uri
 152                         eval q{use MIME::Base64};
 153                         error($@) if $@;
 154                         return "<img src=\"data:image/png;base64,".
 155                                 encode_base64($png)."\" />";
 156                 }
 157         }
 158
 159         return '<img src="'.urlto($fn, $params{destpage}).'" alt="graph" />';
 160 } # }}}
 161
 162 1