dashboardのショートカットキーをカスタマイズする

tumblr_hook.user.js

// ==UserScript==
// @name	tumblr_hook.user.js
// @namespace	http://tondol.com
// @description	dashboardのショートカットキーをカスタマイズする
// @include	http://www.tumblr.com/dashboard
// @include	http://www.tumblr.com/dashboard/*
// @version	0.1
// ==/UserScript==

// 参考:
// http://jsbin.com/awenaq/4
// http://subtech.g.hatena.ne.jp/secondlife/20091228/1262001989

var executeBrowserContext = function(f) {
	var code = f.toString();
	var script = document.createElement("script");
	script.textContent = '(' + code + ')();';
	document.body.appendChild(script);
};

executeBrowserContext(function() {
	var useHooking = function(e) {
		// E, R
		return e.which == 69 || e.which == 82;
	};
	var createEvent = function(charCode, optionKey) {
		var e = document.createEvent('KeyboardEvent');
		Object.defineProperty(e, 'charCode', {
			get: function() { return charCode; }
		});
		Object.defineProperty(e, 'shiftKey', {
			get: function() { return optionKey; }
		});
		Object.defineProperty(e, 'altKey', {
			get: function() { return optionKey; }
		});
		return e;
	};
	var createNewEvent = function(e) {
		// E, R
		if (e.which == 69 || e.which == 82) {
			return createEvent(e.which, !(e.altKey || e.shiftKey));
		} else {
			return e;
		}
	};

	document.addEventListener('keydown', function(e) {
		if (useHooking(e)) {
			e.stopPropagation();
			Tumblr.KeyCommands.keydown(createNewEvent(e));
		}
	}, true);
});