+

+<!-- GoatCounter Analytics -->

+<script defer data-goatcounter="https://analytics.popov.link/count" src="/assets/javascript/count.js"></script>

+<noscript>

+ <img src="https://analytics.popov.link/count?p={{- page.url | relative_url | url_escape -}}&t={{- page.title | default: site.title | strip | normalize_whitespace | url_encode -}}" alt="pixel" />

+</noscript> \ No newline at end of file

+// GoatCounter: https://www.goatcounter.com

+// 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')

+ navigator.sendBeacon(url)

+ }

+

+ // 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()

+ })

+})();