text: import { createLocal } from '../create/local';
  import { cloneWithOffset } from '../units/offset';
  import isFunction from '../utils/is-function';
  import { hooks } from '../utils/hooks';
  
  export function getCalendarFormat(myMoment, now) {
      var diff = myMoment.diff(now, 'days', true);
      return diff < -6 ? 'sameElse' :
              diff < -1 ? 'lastWeek' :
              diff < 0 ? 'lastDay' :
              diff < 1 ? 'sameDay' :
              diff < 2 ? 'nextDay' :
              diff < 7 ? 'nextWeek' : 'sameElse';
  }
  
  export function calendar (time, formats) {
      // We want to compare the start of today, vs this.
      // Getting start-of-today depends on whether we're local/utc/offset or not.
      var now = time || createLocal(),
          sod = cloneWithOffset(now, this).startOf('day'),
          format = hooks.calendarFormat(this, sod) || 'sameElse';
  
      var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format]);
  
      return this.format(output || this.localeData().calendar(format, this, createLocal(now)));
  }
  
  export function isWeekend() {
      if (!(this.isValid())) {
          return false;
      }
      return [0, 6].indexOf(this.weekday()) !== -1;
  }
  