Add content.indentGuidesVisible to TextEditorPresenter::state

spec/text-editor-presenter-spec.coffee

@@ -29,6 +29,14 @@ describe "TextEditorPresenter", ->
         presenter = new TextEditorPresenter(model: editor, clientHeight: 25, clientWidth: 10 * maxLineLength + 20, scrollTop: 0, baseCharacterWidth: 10, lineHeight: 10, lineOverdrawMargin: 0)
         expect(presenter.state.content.scrollWidth).toBe 10 * maxLineLength + 20
 
+      it "assigns .indentGuidesVisible based on the editor.showIndentGuide config setting", ->
+        presenter = new TextEditorPresenter(model: editor, clientHeight: 25, clientWidth: 50, scrollTop: 0, baseCharacterWidth: 10, lineHeight: 10, lineOverdrawMargin: 0)
+        expect(presenter.state.content.indentGuidesVisible).toBe false
+
+        atom.config.set('editor.showIndentGuide', true)
+        presenter = new TextEditorPresenter(model: editor, clientHeight: 25, clientWidth: 50, scrollTop: 0, baseCharacterWidth: 10, lineHeight: 10, lineOverdrawMargin: 0)
+        expect(presenter.state.content.indentGuidesVisible).toBe true
+
     describe "when the ::clientWidth changes", ->
       it "updates .scrollWidth", ->
         maxLineLength = editor.getMaxScreenLineLength()
@@ -68,6 +76,17 @@ describe "TextEditorPresenter", ->
         editor.setSoftWrapped(false)
         expect(presenter.state.content.scrollWidth).toBe 10 * editor.getMaxScreenLineLength() + 1
 
+    describe "when the editor.showIndentGuide config setting changes", ->
+      it "updates .indentGuidesVisible", ->
+        presenter = new TextEditorPresenter(model: editor, clientHeight: 25, clientWidth: 50, scrollTop: 0, baseCharacterWidth: 10, lineHeight: 10, lineOverdrawMargin: 0)
+        expect(presenter.state.content.indentGuidesVisible).toBe false
+
+        atom.config.set('editor.showIndentGuide', true)
+        expect(presenter.state.content.indentGuidesVisible).toBe true
+
+        atom.config.set('editor.showIndentGuide', false)
+        expect(presenter.state.content.indentGuidesVisible).toBe false
+
   describe "::state.content.lines", ->
     describe "on initialization", ->
       it "contains the lines that are visible on screen, plus the overdraw margin", ->

src/text-editor-presenter.coffee

@@ -6,25 +6,31 @@ class TextEditorPresenter
   constructor: ({@model, @clientHeight, @clientWidth, @scrollTop, @lineHeight, @baseCharacterWidth, @lineOverdrawMargin}) ->
     @disposables = new CompositeDisposable
     @charWidthsByScope = {}
-    @subscribeToModel()
+    @observeModel()
+    @observeConfig()
     @buildState()
 
   destroy: ->
     @disposables.dispose()
 
-  subscribeToModel: ->
+  observeModel: ->
     @disposables.add @model.onDidChange(@updateLinesState.bind(this))
     @disposables.add @model.onDidChangeSoftWrapped =>
       @updateContentState()
       @updateLinesState()
 
+  observeConfig: ->
+    @disposables.add atom.config.onDidChange 'editor.showIndentGuide', @updateContentState.bind(this)
+
   buildState: ->
     @state = {}
     @buildContentState()
     @buildLinesState()
 
   buildContentState: ->
-    @state.content = {scrollWidth: @computeScrollWidth()}
+    @state.content =
+      scrollWidth: @computeScrollWidth()
+      indentGuidesVisible: atom.config.get('editor.showIndentGuide')
 
   buildLinesState: ->
     @state.content.lines = {}
@@ -32,6 +38,7 @@ class TextEditorPresenter
 
   updateContentState: ->
     @state.content.scrollWidth = @computeScrollWidth()
+    @state.content.indentGuidesVisible = atom.config.get('editor.showIndentGuide')
 
   updateLinesState: ->
     visibleLineIds = {}