When ( [ { ' or " is inserted, insert the matching character after the cursor

spec/app/language-mode-spec.coffee

@@ -19,6 +19,26 @@ describe "LanguageMode", ->
           editSession.insertText '('
           expect(buffer.lineForRow(0)).toMatch /^\(\)/
 
+      describe "when [ is inserted", ->
+        it "inserts a matching ] following the cursor", ->
+          editSession.insertText '['
+          expect(buffer.lineForRow(0)).toMatch /^\[\]/
+
+      describe "when { is inserted", ->
+        it "inserts a matching ) following the cursor", ->
+          editSession.insertText '{'
+          expect(buffer.lineForRow(0)).toMatch /^\{\}/
+
+      describe "when \" is inserted", ->
+        it "inserts a matching \" following the cursor", ->
+          editSession.insertText '"'
+          expect(buffer.lineForRow(0)).toMatch /^""/
+
+      describe "when ' is inserted", ->
+        it "inserts a matching ' following the cursor", ->
+          editSession.insertText "'"
+          expect(buffer.lineForRow(0)).toMatch /^''/
+
   describe "javascript", ->
     beforeEach ->
       editSession = fixturesProject.buildEditSessionForPath('sample.js', autoIndent: false)

src/app/language-mode.coffee

@@ -4,15 +4,22 @@ _ = require 'underscore'
 
 module.exports =
 class LanguageMode
+  matchingCharacters:
+    '(': ')'
+    '[': ']'
+    '{': '}'
+    '"': '"'
+    "'": "'"
+
   constructor: (@editSession) ->
     @buffer = @editSession.buffer
     @aceMode = @requireAceMode()
     @aceAdaptor = new AceAdaptor(@editSession)
 
-    _.adviseBefore @editSession, 'insertText', (text) ->
-      if text == '('
-        @insertText '()'
-        @moveCursorLeft()
+    _.adviseBefore @editSession, 'insertText', (text) =>
+      if matchingCharacter = @matchingCharacters[text]
+        @editSession.insertText text + matchingCharacter
+        @editSession.moveCursorLeft()
         false
 
   requireAceMode: (fileExtension) ->