browser: automatic retrieval of caniuse data

[sheet.git] / tools / convert-caniuse.pl

diff --git a/tools/convert-caniuse.pl b/tools/convert-caniuse.pl
index f013baf17ee0de04768e49854e00d40399bd7f19..5f619b11178a7e464a6eb263616a9df5beed9a62 100755 (executable)
--- a/tools/convert-caniuse.pl
+++ b/tools/convert-caniuse.pl
@@ -4,9 +4,42 @@ use strict;
 use warnings;
 
 use Data::Dump 'pp';
-use File::Slurp 'read_file';
 use JSON;
 
+if (@ARGV) {
+       require Time::Piece;
+       require LWP::UserAgent;
+       require File::stat;
+
+       my $target = 'browser-support.inc.pl';
+       my $source = 'http://caniuse.com/data.json';
+
+       my $ua = LWP::UserAgent->new;
+       $ua->agent('sheet.shiar.nl/browser');
+       $ua->default_header('If-Modified-Since' => scalar gmtime $_->mtime)
+               for File::stat::stat($target);
+
+       my $res = $ua->get($source) or die "No data from $source\n";
+       !$res->is_error or die $res->status_line;
+       say $res->status_line;
+
+       exit 0 if $res->code == 304;  # unmodified
+
+       my $data = decode_json($res->decoded_content) or die "Parse error: $!";
+       my $updated = eval {
+               s/ GMT$//,
+               return Time::Piece->strptime($_)->ymd for $res->header('Last-Modified')
+       } || time;
+
+       open my $save, '>', (my $download = "browser-support-$updated.inc.pl");
+       print {$save} pp($data);
+       close $save;
+
+       symlink $download, "$target.new" and rename "$target.new", $target
+               or die "New data at $download not linked: $!";
+       exit 0;
+}
+
 local $/;  # slurp
 my $source = readline;
 
@@ -45,6 +78,8 @@ convert-caniuse - Turn Javascript data into an equivalent Perl structure
 
 =head1 SYNOPSIS
 
-       curl http://caniuse.com/jsonp.php |
+       curl http://caniuse.com/data.json |
        tools/convert-caniuse.pl > browser-support.inc.pl
 
+       tools/convert-caniuse.pl auto
+