Refactor helpers and improve feed

helpers.js

@@ -15,14 +15,13 @@ const { render: renderMd } = mdTransformer
 
 mdTransformer.render = str => renderMd(str, config)
 
-// replacements
-const replacements = str => {
-  return str && str.replace(/<\/?u>/g, '').replace(meta.tallycoinUrl, meta.shoutoutUrl)
-}
+// constants
+const IS_DEV = process.env.NODE_ENV === 'development'
+const HOST = IS_DEV ? 'http://localhost:3000' : 'https://einundzwanzig.space'
 
-const stripHTML = str => {
-  return str && encode(decode(str.replace(/(<([^>]+)>)/ig, '').trim().replace(/\n\s*/g, '\n')), { level: 'xml' })
-}
+// replacements
+const replacements = str => str && str.replace(/<\/?u>/g, '').replace(meta.tallycoinUrl, meta.shoutoutUrl)
+const stripHTML = str => str && encode(decode(str.replace(/(<([^>]+)>)/ig, '').trim().replace(/\n\s*/g, '\n')), { level: 'xml' })
 
 // meetups
 const toMeetupMapInfo = m => {
@@ -69,9 +68,32 @@ const participantsWithAliases = participants => {
 }
 
 const participantToId = p => p.replace(/\(.*?\)/, '').trim().toLowerCase()
+const random = max =>  Math.floor(Math.random() * Math.floor(max))
+const shuffle = arr => { for (let i = arr.length - 1; i > 0; i--) { const j = Math.floor(Math.random() * i); const temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; }; return arr }
+const formatDate = date => (new Date(date)).toISOString().replace(/T.*/, '').split('-').reverse().join('.')
+const linkTarget = url => url.startsWith('http') ? '_blank' : null
+const assetPath = path => {
+  if (path.startsWith('http')) return path
+  let revs
+  try { revs = require('./generated/rev.json') } catch (error) { }
+  return `${(revs && revs[path]) || path}`
+}
+const assetUrl = (path, protocol = 'https') => {
+  if (IS_DEV && !path.startsWith('http')) protocol = 'http'
+  const base = path.startsWith('http') ? '' : HOST
+  let url = `${base}${assetPath(path)}`
+  if (!url.startsWith(`${protocol}:`)) url = url.replace(/^.*:/, `${protocol}:`)
+  return url
+}
 
 module.exports = {
   markdown: mdTransformer.render,
+  random,
+  shuffle,
+  assetUrl,
+  assetPath,
+  formatDate,
+  linkTarget,
   replacements,
   slugify,
   stripHTML,