Don't use atom.config global in LanguageMode

src/language-mode.coffee

@@ -8,7 +8,7 @@ class LanguageMode
   # Sets up a `LanguageMode` for the given {TextEditor}.
   #
   # editor - The {TextEditor} to associate with
-  constructor: (@editor) ->
+  constructor: (@editor, @config) ->
     {@buffer} = @editor
 
   destroy: ->
@@ -327,7 +327,7 @@ class LanguageMode
       @editor.setIndentationForBufferRow(bufferRow, desiredIndentLevel)
 
   getRegexForProperty: (scopeDescriptor, property) ->
-    if pattern = atom.config.get(property, scope: scopeDescriptor)
+    if pattern = @config.get(property, scope: scopeDescriptor)
       new OnigRegExp(pattern)
 
   increaseIndentRegexForScopeDescriptor: (scopeDescriptor) ->
@@ -343,8 +343,8 @@ class LanguageMode
     @getRegexForProperty(scopeDescriptor, 'editor.foldEndPattern')
 
   commentStartAndEndStringsForScope: (scope) ->
-    commentStartEntry = atom.config.getAll('editor.commentStart', {scope})[0]
-    commentEndEntry = _.find atom.config.getAll('editor.commentEnd', {scope}), (entry) ->
+    commentStartEntry = @config.getAll('editor.commentStart', {scope})[0]
+    commentEndEntry = _.find @config.getAll('editor.commentEnd', {scope}), (entry) ->
       entry.scopeSelector is commentStartEntry.scopeSelector
     commentStartString = commentStartEntry?.value
     commentEndString = commentEndEntry?.value

src/text-editor.coffee

@@ -128,7 +128,7 @@ class TextEditor extends Model
       initialColumn = Math.max(parseInt(initialColumn) or 0, 0)
       @addCursorAtBufferPosition([initialLine, initialColumn])
 
-    @languageMode = new LanguageMode(this)
+    @languageMode = new LanguageMode(this, @config)
 
     @setEncoding(@config.get('core.fileEncoding', scope: @getRootScopeDescriptor()))