live-fns: add RubyGems support (#79)

* feat: rubygems support

* style: resolve spacing issues

libs/index.md

@@ -156,6 +156,15 @@ Available query params:
       ['github issues', '/packagist/ghi/monolog/monolog'],
       ['language', '/packagist/lang/monolog/monolog'],
     ],
+    rubygems: [
+      ['version (stable)', '/rubygems/v/rails'],
+      ['version (pre)', '/rubygems/v/rails/pre'],
+      ['version (latest)', '/rubygems/v/rails/latest'],
+      ['total downloads', '/rubygems/dt/rails'],
+      ['version downloads', '/rubygems/dv/rails'],
+      ['name', '/rubygems/n/rails'],
+      ['platform', '/rubygems/p/rails'],
+    ],
     /* CIs */
     travis: [
       ['build', '/travis/babel/babel'],

libs/live-fns/_index.js

@@ -18,6 +18,7 @@ module.exports = {
   'packagephobia': require('./packagephobia.js'),
   'packagist': require('./packagist.js'),
   'pypi': require('./pypi.js'),
+  'rubygems': require('./rubygems.js'),
   'runkit': require('./runkit.js'),
   'travis': require('./travis.js'),
   'uptime-robot': require('./uptime-robot.js')

libs/live-fns/rubygems.js

@@ -0,0 +1,101 @@
+const millify = require('millify')
+
+const axios = require('../axios.js')
+const semColor = require('../utils/sem-color.js')
+
+const preConditions = ['.rc', '.beta', '-rc', '-beta']
+
+const pre = versions => versions.filter(v => {
+  for (let condition of preConditions) {
+    if (!v.includes(condition)) {
+      return false
+    }
+  }
+
+  return true
+})
+
+const stable = versions => versions.filter(v => {
+  for (let condition of preConditions) {
+    if (v.includes(condition)) {
+      return false
+    }
+  }
+
+  return true
+})
+
+const latest = versions => versions.length > 0 && versions.slice(-1)[0]
+
+const request = async endpoint => {
+  return axios.get(`https://rubygems.org/api/v1/${endpoint}.json`).then(res => res.data)
+}
+
+module.exports = async function (topic, gem, channel = 'stable') {
+  let response
+
+  if (topic !== 'v') {
+    response = await request(`gems/${gem}`)
+  }
+
+  switch (topic) {
+    case 'v':
+      response = await request(`versions/${gem}`)
+
+      const versions = Object
+        .values(response)
+        .map(value => value.number)
+        .reverse()
+
+      let version = ''
+
+      switch (channel) {
+        case 'latest':
+          version = latest(versions)
+          break
+        case 'pre':
+          version = latest(pre(versions))
+          break
+        default:
+          version = latest(stable(versions))
+      }
+
+      version = version || latest(versions)
+
+      return {
+        subject: 'rubygems',
+        status: version || 'unknown',
+        color: semColor(version)
+      }
+    case 'dt':
+      return {
+        subject: 'downloads',
+        status: millify(response.downloads),
+        color: 'green'
+      }
+    case 'dv':
+      return {
+        subject: 'downloads',
+        status: millify(response.version_downloads) + '/version',
+        color: 'green'
+      }
+    case 'n':
+      return {
+        subject: 'rubygems',
+        status: response.name,
+        color: 'green'
+      }
+    case 'p':
+      return {
+        subject: 'platform',
+        status: response.platform,
+        color: 'green'
+      }
+    default:
+      return {
+        subject: 'rubygems',
+        status: 'unknown',
+        color: 'grey'
+      }
+  }
+}