text: // GoatCounter: https://www.goatcounter.com
  // This file (and *only* this file) is released under the ISC license:
  // https://opensource.org/licenses/ISC
  ;(function() {
  	'use strict';
  
  	if (window.goatcounter && window.goatcounter.vars)  // Compatibility with very old version; do not use.
  		window.goatcounter = window.goatcounter.vars
  	else
  		window.goatcounter = window.goatcounter || {}
  
  	// Load settings from data-goatcounter-settings.
  	var s = document.querySelector('script[data-goatcounter]')
  	if (s && s.dataset.goatcounterSettings) {
  		try         { var set = JSON.parse(s.dataset.goatcounterSettings) }
  		catch (err) { console.error('invalid JSON in data-goatcounter-settings: ' + err) }
  		for (var k in set)
  			if (['no_onload', 'no_events', 'allow_local', 'allow_frame', 'path', 'title', 'referrer', 'event'].indexOf(k) > -1)
  				window.goatcounter[k] = set[k]
  	}
  
  	var enc = encodeURIComponent
  
  	// Get all data we're going to send off to the counter endpoint.
  	var get_data = function(vars) {
  		var data = {
  			p: (vars.path     === undefined ? goatcounter.path     : vars.path),
  			r: (vars.referrer === undefined ? goatcounter.referrer : vars.referrer),
  			t: (vars.title    === undefined ? goatcounter.title    : vars.title),
  			e: !!(vars.event || goatcounter.event),
  			s: [window.screen.width, window.screen.height, (window.devicePixelRatio || 1)],
  			b: is_bot(),
  			q: location.search,
  		}
  
  		var rcb, pcb, tcb  // Save callbacks to apply later.
  		if (typeof(data.r) === 'function') rcb = data.r
  		if (typeof(data.t) === 'function') tcb = data.t
  		if (typeof(data.p) === 'function') pcb = data.p
  
  		if (is_empty(data.r)) data.r = document.referrer
  		if (is_empty(data.t)) data.t = document.title
  		if (is_empty(data.p)) data.p = get_path()
  
  		if (rcb) data.r = rcb(data.r)
  		if (tcb) data.t = tcb(data.t)
  		if (pcb) data.p = pcb(data.p)
  		return data
  	}
  
  	// Check if a value is "empty" for the purpose of get_data().
  	var is_empty = function(v) { return v === null || v === undefined || typeof(v) === 'function' }
  
  	// See if this looks like a bot; there is some additional filtering on the
  	// backend, but these properties can't be fetched from there.
  	var is_bot = function() {
  		// Headless browsers are probably a bot.
  		var w = window, d = document
  		if (w.callPhantom || w._phantom || w.phantom)
  			return 150
  		if (w.__nightmare)
  			return 151
  		if (d.__selenium_unwrapped || d.__webdriver_evaluate || d.__driver_evaluate)
  			return 152
  		if (navigator.webdriver)
  			return 153
  		return 0
  	}
  
  	// Object to urlencoded string, starting with a ?.
  	var urlencode = function(obj) {
  		var p = []
  		for (var k in obj)
  			if (obj[k] !== '' && obj[k] !== null && obj[k] !== undefined && obj[k] !== false)
  				p.push(enc(k) + '=' + enc(obj[k]))
  		return '?' + p.join('&')
  	}
  
  	// Show a warning in the console.
  	var warn = function(msg) {
  		if (console && 'warn' in console)
  			console.warn('goatcounter: ' + msg)
  	}
  
  	// Get the endpoint to send requests to.
  	var get_endpoint = function() {
  		var s = document.querySelector('script[data-goatcounter]')
  		if (s && s.dataset.goatcounter)
  			return s.dataset.goatcounter
  		return (goatcounter.endpoint || window.counter)  // counter is for compat; don't use.
  	}
  
  	// Get current path.
  	var get_path = function() {
  		var loc = location,
  			c = document.querySelector('link[rel="canonical"][href]')
  		if (c) {  // May be relative or point to different domain.
  			var a = document.createElement('a')
  			a.href = c.href
  			if (a.hostname.replace(/^www\./, '') === location.hostname.replace(/^www\./, ''))
  				loc = a
  		}
  		return (loc.pathname + loc.search) || '/'
  	}
  
  	// Run function after DOM is loaded.
  	var on_load = function(f) {
  		if (document.body === null)
  			document.addEventListener('DOMContentLoaded', function() { f() }, false)
  		else
  			f()
  	}
  
  	// Filter some requests that we (probably) don't want to count.
  	goatcounter.filter = function() {
  		if ('visibilityState' in document && document.visibilityState === 'prerender')
  			return 'visibilityState'
  		if (!goatcounter.allow_frame && location !== parent.location)
  			return 'frame'
  		if (!goatcounter.allow_local && location.hostname.match(/(localhost$|^127\.|^10\.|^172\.(1[6-9]|2[0-9]|3[0-1])\.|^192\.168\.|^0\.0\.0\.0$)/))
  			return 'localhost'
  		if (!goatcounter.allow_local && location.protocol === 'file:')
  			return 'localfile'
  		if (localStorage && localStorage.getItem('skipgc') === 't')
  			return 'disabled with #toggle-goatcounter'
  		return false
  	}
  
  	// Get URL to send to GoatCounter.
  	window.goatcounter.url = function(vars) {
  		var data = get_data(vars || {})
  		if (data.p === null)  // null from user callback.
  			return
  		data.rnd = Math.random().toString(36).substr(2, 5)  // Browsers don't always listen to Cache-Control.
  
  		var endpoint = get_endpoint()
  		if (!endpoint)
  			return warn('no endpoint found')
  
  		return endpoint + urlencode(data)
  	}
  
  	// Count a hit.
  	window.goatcounter.count = function(vars) {
  		var f = goatcounter.filter()
  		if (f)
  			return warn('not counting because of: ' + f)
  
  		var url = goatcounter.url(vars)
  		if (!url)
  			return warn('not counting because path callback returned null')
  
  		var img = document.createElement('img')
  		img.src = url
  		img.style.position = 'absolute'  // Affect layout less.
  		img.style.bottom = '0px'
  		img.style.width = '1px'
  		img.style.height = '1px'
  		img.loading = 'eager'
  		img.setAttribute('alt', '')
  		img.setAttribute('aria-hidden', 'true')
  
  		var rm = function() { if (img && img.parentNode) img.parentNode.removeChild(img) }
  		img.addEventListener('load', rm, false)
  		document.body.appendChild(img)
  	}
  
  	// Get a query parameter.
  	window.goatcounter.get_query = function(name) {
  		var s = location.search.substr(1).split('&')
  		for (var i = 0; i < s.length; i++)
  			if (s[i].toLowerCase().indexOf(name.toLowerCase() + '=') === 0)
  				return s[i].substr(name.length + 1)
  	}
  
  	// Track click events.
  	window.goatcounter.bind_events = function() {
  		if (!document.querySelectorAll)  // Just in case someone uses an ancient browser.
  			return
  
  		var send = function(elem) {
  			return function() {
  				goatcounter.count({
  					event:    true,
  					path:     (elem.dataset.goatcounterClick || elem.name || elem.id || ''),
  					title:    (elem.dataset.goatcounterTitle || elem.title || (elem.innerHTML || '').substr(0, 200) || ''),
  					referrer: (elem.dataset.goatcounterReferrer || elem.dataset.goatcounterReferral || ''),
  				})
  			}
  		}
  
  		Array.prototype.slice.call(document.querySelectorAll("*[data-goatcounter-click]")).forEach(function(elem) {
  			if (elem.dataset.goatcounterBound)
  				return
  			var f = send(elem)
  			elem.addEventListener('click', f, false)
  			elem.addEventListener('auxclick', f, false)  // Middle click.
  			elem.dataset.goatcounterBound = 'true'
  		})
  	}
  
  	// Add a "visitor counter" frame or image.
  	window.goatcounter.visit_count = function(opt) {
  		on_load(function() {
  			opt        = opt        || {}
  			opt.type   = opt.type   || 'html'
  			opt.append = opt.append || 'body'
  			opt.path   = opt.path   || get_path()
  			opt.attr   = opt.attr   || {width: '200', height: (opt.no_branding ? '60' : '80')}
  
  			opt.attr['src'] = get_endpoint() + 'er/' + enc(opt.path) + '.' + enc(opt.type) + '?'
  			if (opt.no_branding) opt.attr['src'] += '&no_branding=1'
  			if (opt.style)       opt.attr['src'] += '&style=' + enc(opt.style)
  			if (opt.start)       opt.attr['src'] += '&start=' + enc(opt.start)
  			if (opt.end)         opt.attr['src'] += '&end='   + enc(opt.end)
  
  			var tag = {png: 'img', svg: 'img', html: 'iframe'}[opt.type]
  			if (!tag)
  				return warn('visit_count: unknown type: ' + opt.type)
  
  			if (opt.type === 'html') {
  				opt.attr['frameborder'] = '0'
  				opt.attr['scrolling']   = 'no'
  			}
  
  			var d = document.createElement(tag)
  			for (var k in opt.attr)
  				d.setAttribute(k, opt.attr[k])
  
  			var p = document.querySelector(opt.append)
  			if (!p)
  				return warn('visit_count: append not found: ' + opt.append)
  			p.appendChild(d)
  		})
  	}
  
  	// Make it easy to skip your own views.
  	if (location.hash === '#toggle-goatcounter') {
  		if (localStorage.getItem('skipgc') === 't') {
  			localStorage.removeItem('skipgc', 't')
  			alert('GoatCounter tracking is now ENABLED in this browser.')
  		}
  		else {
  			localStorage.setItem('skipgc', 't')
  			alert('GoatCounter tracking is now DISABLED in this browser until ' + location + ' is loaded again.')
  		}
  	}
  
  	if (!goatcounter.no_onload)
  		on_load(function() {
  			// 1. Page is visible, count request.
  			// 2. Page is not yet visible; wait until it switches to 'visible' and count.
  			// See #487
  			if (!('visibilityState' in document) || document.visibilityState === 'visible')
  				goatcounter.count()
  			else {
  				var f = function(e) {
  					if (document.visibilityState !== 'visible')
  						return
  					document.removeEventListener('visibilitychange', f)
  					goatcounter.count()
  				}
  				document.addEventListener('visibilitychange', f)
  			}
  
  			if (!goatcounter.no_events)
  				goatcounter.bind_events()
  		})
  })();
  