Add Meson specs (#1848)

* Add meson to the list of supported languages

* Add mimetypes detection for Meson

* Add specs for Meson lexer

* Use the same memoized variables as method name

docs/Languages.md

@@ -124,6 +124,7 @@
 - Mason (`mason`)
 - Mathematica (`mathematica`)
 - MATLAB (`matlab`)
+- Meson (`meson`)
 - MiniZinc (`minizinc`)
 - MoonScript (`moonscript`)
 - Mosel (`mosel`)

lib/rouge/lexers/meson.rb

@@ -8,6 +8,7 @@ class Meson < RegexLexer
       desc "Meson's specification language (mesonbuild.com)"
       tag 'meson'
       filenames 'meson.build', 'meson_options.txt'
+      mimetypes 'text/x-meson'
 
       def self.keywords
         @keywords ||= %w(
@@ -40,7 +41,7 @@ def self.builtin_functions
       dotted_identifier = /[[:alpha:]_.][[:alnum:]_.]*/
 
       def current_string
-        @string_register ||= StringRegister.new
+        @current_string ||= StringRegister.new
       end
 
       state :root do

spec/lexers/meson_spec.rb

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*- #
+
+describe Rouge::Lexers::Meson do
+  let(:subject) { Rouge::Lexers::Meson.new }
+
+  describe 'guessing' do
+    include Support::Guessing
+
+    it 'guesses by filename' do
+      assert_guess :filename => 'meson.build'
+      assert_guess :filename => 'meson_options.txt'
+    end
+
+    it 'guesses by mimetype' do
+      assert_guess :mimetype => 'text/x-meson'
+    end
+  end
+end