added shortcut manager and allow user to customize toggle mode shortcut

browser/main/lib/shortcutManager.js

@@ -0,0 +1,40 @@
+import Mousetrap from 'mousetrap'
+import CM from 'browser/main/lib/ConfigManager'
+import ee from 'browser/main/lib/eventEmitter'
+import { isObjectEqual } from 'browser/lib/utils'
+require('mousetrap-global-bind')
+const functions = require('./shortcut')
+
+let shortcuts = CM.get().hotkey
+
+ee.on('config-renew', function () {
+  // only update if hotkey changed !
+  const newHotkey = CM.get().hotkey
+  if (!isObjectEqual(newHotkey, shortcuts)) {
+    updateShortcut(newHotkey)
+  }
+})
+
+function updateShortcut (newHotkey) {
+  Mousetrap.reset()
+  shortcuts = newHotkey
+  applyShortcuts(newHotkey)
+}
+
+function formatShortcut (shortcut) {
+  return shortcut.toLowerCase().replace(/ /g, '')
+}
+
+function applyShortcuts (shortcuts) {
+  for (const shortcut in shortcuts) {
+    const toggler = formatShortcut(shortcuts[shortcut])
+    // only bind if the function for that shortcut exists
+    if (functions[shortcut]) {
+      Mousetrap.bindGlobal(toggler, functions[shortcut])
+    }
+  }
+}
+
+applyShortcuts(CM.get().hotkey)
+
+module.exports = applyShortcuts