Use editor.preferredLineLength as default column

This config value will be used when no custom column
exists for the current path.

docs/configuring.md

@@ -40,7 +40,8 @@ its own namespace.
 - stripTrailingWhitespace
   - singleTrailingNewline: Whether to reduce multiple newlines to one at the end of files
 - wrapGuide
-  - columns: Soon to be replaced by editor.preferredLineLength
+  - columns: Array of hashes with a `pattern` and `column` key to match the
+             the path of the current editor to a column position.
 
 ## Reading Config Settings
 

src/packages/wrap-guide/lib/wrap-guide-view.coffee

@@ -11,23 +11,24 @@ class WrapGuideView extends View
   @content: ->
     @div class: 'wrap-guide'
 
-  defaultColumn: 80
-
   initialize: (@editor) ->
     @observeConfig 'editor.fontSize', => @updateGuide()
     @subscribe @editor, 'editor:path-changed', => @updateGuide()
     @subscribe @editor, 'editor:min-width-changed', => @updateGuide()
     @subscribe $(window), 'resize', => @updateGuide()
 
+  getDefaultColumn: ->
+    config.get('editor.preferredLineLength') ? 80
+
   getGuideColumn: (path) ->
     customColumns = config.get('wrapGuide.columns')
-    return @defaultColumn unless _.isArray(customColumns)
+    return @getDefaultColumn() unless _.isArray(customColumns)
     for customColumn in customColumns
       continue unless _.isObject(customColumn)
       pattern = customColumn['pattern']
       continue unless pattern
       return parseInt(customColumn['column']) if new RegExp(pattern).test(path)
-    @defaultColumn
+    @getDefaultColumn()
 
   updateGuide: ->
     column = @getGuideColumn(@editor.getPath(), @defaultColumn)

src/packages/wrap-guide/spec/wrap-guide-spec.coffee

@@ -9,7 +9,7 @@ describe "WrapGuide", ->
     rootView.attachToDom()
     editor = rootView.getActiveEditor()
     wrapGuide = rootView.find('.wrap-guide').view()
-    editor.width(editor.charWidth * wrapGuide.defaultColumn * 2)
+    editor.width(editor.charWidth * wrapGuide.getDefaultColumn() * 2)
 
   afterEach ->
     rootView.deactivate()
@@ -24,7 +24,7 @@ describe "WrapGuide", ->
 
   describe "@updateGuide", ->
     it "positions the guide at the configured column", ->
-      width = editor.charWidth * wrapGuide.defaultColumn
+      width = editor.charWidth * wrapGuide.getDefaultColumn()
       expect(width).toBeGreaterThan(0)
       expect(wrapGuide.position().left).toBe(width)
       expect(wrapGuide).toBeVisible()
@@ -48,7 +48,7 @@ describe "WrapGuide", ->
     it "uses the default column when no custom column matches the path", ->
       config.set('wrapGuide.columns', [{pattern: '\.jsp$', column: '100'}])
       wrapGuide.updateGuide()
-      width = editor.charWidth * wrapGuide.defaultColumn
+      width = editor.charWidth * wrapGuide.getDefaultColumn()
       expect(width).toBeGreaterThan(0)
       expect(wrapGuide.position().left).toBe(width)