Start on CommandMap for Vim-style command mode. Matches patterns involving multiple key events.

src/atom/command-map.coffee

@@ -0,0 +1,49 @@
+_ = require 'underscore'
+KeyBinder = require 'key-binder'
+
+module.exports =
+class CommandMap
+  delegate: null
+  mappings: null
+  bufferedEvents: null
+  namedKeys:
+    backspace: 8, tab: 9, clear: 12,
+    enter: 13, 'return': 13,
+    esc: 27, escape: 27, space: 32,
+    left: 37, up: 38,
+    right: 39, down: 40,
+    del: 46, 'delete': 46,
+    home: 36, end: 35,
+    pageup: 33, pagedown: 34,
+    ',': 188, '.': 190, '/': 191,
+    '`': 192, '-': 189, '=': 187,
+    ';': 186, '\'': 222,
+    '[': 219, ']': 221, '\\': 220
+
+  constructor: (@delegate) ->
+    @mappings = {}
+    @bufferedEvents = []
+
+  mapKey: (pattern, action) ->
+    @mappings[pattern] = action
+
+  handleKeyEvent: (event) ->
+    @bufferedEvents.push(event)
+
+    for pattern, action of @mappings
+      if @keyEventsMatchPattern(@bufferedEvents, pattern)
+        @delegate[action](event)
+
+  keyEventsMatchPattern: (events, pattern) ->
+    patternKeys = @parseKeyPattern(pattern)
+    return false unless events.length == patternKeys.length
+    _.all(_.zip(events, patternKeys), ([event, pattern]) -> 
+      event.which == pattern.which)
+
+  parseKeyPattern: (pattern) ->
+    for char in pattern
+      { which: char.toUpperCase().charCodeAt(0) }
+
+  clearBufferedEvents: ->
+    @bufferedEvents = []
+