Add ability to add/remove keymaps by name

spec/app/keymap-spec.coffee

@@ -1,5 +1,6 @@
 Keymap = require 'keymap'
 $ = require 'jquery'
+{$$} = require 'space-pen'
 RootView = require 'root-view'
 
 describe "Keymap", ->
@@ -234,7 +235,7 @@ describe "Keymap", ->
       it "returns false to prevent the browser from transferring focus", ->
         expect(keymap.handleKeyEvent(keydownEvent('U+0009', target: fragment[0]))).toBe false
 
-  describe ".bindKeys(selector, hash)", ->
+  describe ".bindKeys(selector, bindings)", ->
     it "normalizes the key patterns in the hash to put the modifiers in alphabetical order", ->
       fooHandler = jasmine.createSpy('fooHandler')
       fragment.on 'foo', fooHandler
@@ -249,6 +250,24 @@ describe "Keymap", ->
       expect(result).toBe(false)
       expect(fooHandler).toHaveBeenCalled()
 
+  describe ".remove(name)", ->
+    it "removes the binding set with the given selector and bindings", ->
+      keymap.add 'nature',
+        '.green':
+          'ctrl-c': 'cultivate'
+        '.brown':
+          'ctrl-h': 'harvest'
+
+      expect(keymap.bindingsForElement($$ -> @div class: 'green')).toEqual { 'ctrl-c': 'cultivate' }
+      expect(keymap.bindingsForElement($$ -> @div class: 'brown')).toEqual { 'ctrl-h': 'harvest' }
+
+      keymap.remove('nature')
+
+      expect(keymap.bindingsForElement($$ -> @div class: 'green')).toEqual {}
+      expect(keymap.bindingsForElement($$ -> @div class: 'brown')).toEqual {}
+      expect(keymap.bindingSetsByFirstKeystroke['ctrl-c']).toEqual []
+      expect(keymap.bindingSetsByFirstKeystroke['ctrl-h']).toEqual []
+
   describe ".keystrokeStringForEvent(event)", ->
     describe "when no modifiers are pressed", ->
       it "returns a string that identifies the key pressed", ->

src/app/binding-set.coffee

@@ -14,8 +14,9 @@ class BindingSet
   commandsByKeystrokes: null
   commandForEvent: null
   parser: null
+  name: null
 
-  constructor: (@selector, commandsByKeystrokes, @index) ->
+  constructor: (@selector, commandsByKeystrokes, @index, @name) ->
     BindingSet.parser ?= PEG.buildParser(fs.read(require.resolve 'keystroke-pattern.pegjs'))
     @specificity = Specificity(@selector)
     @commandsByKeystrokes = @normalizeCommandsByKeystrokes(commandsByKeystrokes)

src/app/keymap.coffee

@@ -40,20 +40,39 @@ class Keymap
     @load(filePath) for filePath in fs.list(directoryPath, ['.cson', '.json']) ? []
 
   load: (path) ->
-    @add(CSON.readObject(path))
+    @add(path, CSON.readObject(path))
 
-  add: (keymap) ->
+  add: (args...) ->
+    name = args.shift() if args.length > 1
+    keymap = args.shift()
     for selector, bindings of keymap
-      @bindKeys(selector, bindings)
+      @bindKeys(name, selector, bindings)
 
-  bindKeys: (selector, bindings) ->
-    bindingSet = new BindingSet(selector, bindings, @bindingSets.length)
+  remove: (name) ->
+    for bindingSet in @bindingSets.filter((bindingSet) -> bindingSet.name is name)
+      _.remove(@bindingSets, bindingSet)
+      for keystrokes of bindingSet.commandsByKeystrokes
+        keystroke = keystrokes.split(' ')[0]
+        _.remove(@bindingSetsByFirstKeystroke[keystroke], bindingSet)
+
+  bindKeys: (args...) ->
+    name = args.shift() if args.length > 2
+    [selector, bindings] = args
+    bindingSet = new BindingSet(selector, bindings, @bindingSets.length, name)
     @bindingSets.unshift(bindingSet)
     for keystrokes of bindingSet.commandsByKeystrokes
       keystroke = keystrokes.split(' ')[0] # only index by first keystroke
       @bindingSetsByFirstKeystroke[keystroke] ?= []
       @bindingSetsByFirstKeystroke[keystroke].push(bindingSet)
 
+  unbindKeys: (selector, bindings) ->
+    bindingSet = _.detect @bindingSets, (bindingSet) ->
+      bindingSet.selector is selector and bindingSet.bindings is bindings
+
+    if bindingSet
+      console.log "binding set", bindingSet
+      _.remove(@bindingSets, bindingSet)
+
   bindingsForElement: (element) ->
     keystrokeMap = {}
     currentNode = $(element)