add JSCS Fixer

- Cannot be configured via the settings UI yet.
- Only fixes files, that have a .jscsrc file in one of their parent
folders (up to the project root folder in Atom).

package.json

@@ -46,6 +46,10 @@
     {
       "name": "Ramón Cahenzli",
       "url": "https://github.com/psy-q"
+    },
+    {
+      "name": "Clemens Damke",
+      "url": "https://github.com/Cortys"
     }
   ],
   "engines": {
@@ -69,6 +73,7 @@
     "extend": "^2.0.1",
     "handlebars": "^3.0.3",
     "js-beautify": "^1.5.6",
+    "jscs": "^1.13.1",
     "lodash": "3.9.3",
     "loophole": "^1.0.0",
     "node-dir": "^0.1.8",

src/beautifiers/index.coffee

@@ -42,6 +42,7 @@ module.exports = class Beautifiers extends EventEmitter
     'gofmt'
     'fortran-beautifier'
     'js-beautify'
+    'jscs'
     'perltidy'
     'php-cs-fixer'
     'prettydiff'

src/beautifiers/jscs.coffee

@@ -0,0 +1,40 @@
+"use strict"
+Beautifier = require('./beautifier')
+Checker = require 'jscs'
+cliConfig = require 'jscs/lib/cli-config'
+
+checker = null
+
+module.exports = class JSCSFixer extends Beautifier
+  name: "JSCS Fixer"
+
+  options: {
+    JavaScript: false
+  }
+
+  beautify: (text, language, options) ->
+    @verbose("JSCS Fixer language #{language}")
+    return new @Promise((resolve, reject) =>
+      try
+        editor = atom.workspace.getActiveTextEditor()
+        path = if editor? then editor.getPath() else undefined
+        config = if path? then cliConfig.load(undefined, atom.project.relativizePath(path)[0]) else undefined
+        if !checker?
+          checker = new Checker()
+          checker.registerDefaultRules()
+        if !config?
+          throw new Error("No JSCS config found.")
+        checker.configure(config)
+        result = checker.fixString(text, path)
+        if result.errors.getErrorCount() > 0
+          @error(result.errors.getErrorList().reduce((res, err) =>
+            "#{res}<br> Line #{err.line}: #{err.message}"
+          , "JSCS Fixer error:"))
+
+        resolve result.output
+
+      catch err
+        @error("JSCS Fixer error: #{err}")
+        reject(err)
+
+    )