var assert = require('assert')

module.exports = history

// listen to html5 pushstate events
// and update router accordingly
// fn(str) -> null
function history (cb) {
  assert.equal(typeof cb, 'function', 'sheet-router/history: cb must be a function')
  window.onpopstate = function () {
    var obj = {
      pathname: document.location.pathname,
      search: document.location.search,
      href: document.location.href,
      hash: document.location.hash
    }
    cb(obj)
  }
}