add rust lang

Author: sunwayforever

lib/config.js

@@ -25,6 +25,7 @@ const DEFAULT_CONFIG = {
       'python',
       'python3',
       'ruby',
+      'rust',
       'scala',
       'swift'
     ],

lib/helper.js

@@ -42,6 +42,7 @@ const LANGS = [
   {lang: 'python',     ext: '.py',         style: '#'},
   {lang: 'python3',    ext: '.py',         style: '#'},
   {lang: 'ruby',       ext: '.rb',         style: '#'},
+  {lang: 'rust',       ext: '.rs',         style: 'c'},
   {lang: 'scala',      ext: '.scala',      style: 'c'},
   {lang: 'swift',      ext: '.swift',      style: 'c'}
 ];

test/test_helper.js

@@ -133,7 +133,7 @@ describe('helper', function() {
       assert.equal(h.langToExt('ruby'), '.rb');
       assert.equal(h.langToExt('scala'), '.scala');
       assert.equal(h.langToExt('swift'), '.swift');
-      assert.equal(h.langToExt('rust'), '.raw');
+      assert.equal(h.langToExt('rust'), '.rs');
     });
   }); // #langToExt
 
@@ -152,6 +152,7 @@ describe('helper', function() {
       assert.equal(h.extToLang('~/leetcode/file.swift'), 'swift');
       assert.equal(h.extToLang('~/leetcode/../file.sql'), 'mysql');
       assert.equal(h.extToLang('/home/skygragon/file.dat'), 'unknown');
+      assert.equal(h.extToLang('~/leetcode/file.rs'), 'rust');
     });
   }); // #extToLang