Merge branch 'master' into new-grammars

.gitmodules

@@ -612,3 +612,6 @@
 [submodule "vendor/grammars/sublime-opal"]
 	path = vendor/grammars/sublime-opal
 	url = https://github.com/artifactz/sublime-opal
+[submodule "vendor/grammars/mediawiki.tmbundle"]
+	path = vendor/grammars/mediawiki.tmbundle
+	url = https://github.com/textmate/mediawiki.tmbundle

CONTRIBUTING.md

@@ -33,9 +33,9 @@ Misclassifications can often be solved by either adding a new filename or extens
 
 Syntax highlighting in GitHub is performed using TextMate-compatible grammars. These are the same grammars that TextMate, Sublime Text and Atom use. Every language in [languages.yml][languages] is mapped to its corresponding TM `scope`. This scope will be used when picking up a grammar for highlighting.
 
-Assuming your code is being detected as the right language (see [Language Detection](#language-detection) above), in most cases this is due to a bug in the language grammar rather than a bug in Linguist. [`grammars.yml`][grammars] lists all the grammars we use for syntax highlighting on github.com. Find the one corresponding to your code's programming language and submit a bug report upstream. If you can, try to reproduce the highlighting problem in the text editor that the grammar is designed for (TextMate, Sublime Text, or Atom) and include that information in your bug report.
+Assuming your code is being detected as the right language, in most cases this is due to a bug in the language grammar rather than a bug in Linguist. [`grammars.yml`][grammars] lists all the grammars we use for syntax highlighting on github.com. Find the one corresponding to your code's programming language and submit a bug report upstream. If you can, try to reproduce the highlighting problem in the text editor that the grammar is designed for (TextMate, Sublime Text, or Atom) and include that information in your bug report.
 
-You can also try to fix the bug yourself and submit a Pull Request. [TextMate's documentation](http://manual.macromates.com/en/language_grammars) offers a good introduction on how to work with TextMate-compatible grammars. You can test grammars using [Lightshow](https://lightshow.githubapp.com).
+You can also try to fix the bug yourself and submit a Pull Request. [TextMate's documentation](http://manual.macromates.com/en/language_grammars) offers a good introduction on how to work with TextMate-compatible grammars. You can test grammars using [Lightshow](https://github-lightshow.herokuapp.com).
 
 Once the bug has been fixed upstream, please let us know and we'll pick it up for GitHub.
 

grammars.yml

@@ -346,6 +346,8 @@ vendor/grammars/matlab.tmbundle:
 - source.octave
 vendor/grammars/maven.tmbundle:
 - text.xml.pom
+vendor/grammars/mediawiki.tmbundle/:
+- text.html.mediawiki
 vendor/grammars/mercury-tmlanguage:
 - source.mercury
 vendor/grammars/monkey.tmbundle:

lib/linguist/heuristics.rb

@@ -92,7 +92,7 @@ module Linguist
     disambiguate "Perl", "Perl6", "Prolog" do |data|
       if data.include?("use v6")
         Language["Perl6"]
-      elsif data.include?("use strict")
+      elsif data.match(/use strict|use\s+v?5\./)
         Language["Perl"]
       elsif data.include?(":-")
         Language["Prolog"]

lib/linguist/languages.yml

@@ -1807,7 +1807,7 @@ MediaWiki:
   wrap: true
   extensions:
   - .mediawiki
-  tm_scope: none
+  tm_scope: text.html.mediawiki
   ace_mode: text
 
 Mercury:

samples/Perl/use5.pl

@@ -0,0 +1,3 @@
+use Mojolicious::Lite;
+use 5.20.0;
+use experimental 'signatures';

test/test_heuristics.rb

@@ -48,7 +48,7 @@ class TestHeuristcs < Minitest::Test
   def test_pl_prolog_perl_by_heuristics
     assert_heuristics({
       "Prolog" => "Prolog/turing.pl",
-      "Perl" => "Perl/perl-test.t",
+      "Perl" => ["Perl/perl-test.t", "Perl/use5.pl"]
     })
   end