live-fns: (lgtm) introduce lgtm service (#126)

* live-fns: (lgtm) introduce lgtm service

* live-fns: (lgtm) split out to separate functions

* fix: remove console.log

libs/index.md

@@ -247,6 +247,11 @@ Advanced usage (for badge makers):
       ['coverage', '/codeclimate/coverage/jekyll/jekyll'],
       ['coverage (letter)', '/codeclimate/coverage-letter/jekyll/jekyll']
     ],
+    'lgtm': [
+      ['number of alerts', '/lgtm/alerts/g/apache/cloudstack'],
+      ['java code quality', '/lgtm/grade/java/g/apache/cloudstack'],
+      ['C/C++ code quality', '/lgtm/grade/cpp/g/systemd/systemd'],
+    ],
     'uptime robot': [
       ['status', '/uptime-robot/status/m780862024-50db2c44c703e5c68d6b1ebb'],
       ['(24 hours) uptime', '/uptime-robot/day/m780862024-50db2c44c703e5c68d6b1ebb'],

libs/live-fns/_index.js

@@ -17,6 +17,7 @@ module.exports = {
   hackage: require('./hackage.js'),
   homebrew: require('./homebrew.js'),
   https: require('./https.js'),
+  lgtm: require('./lgtm.js'),
   npm: require('./npm.js'),
   nuget: require('./nuget.js'),
   opencollective: require('./opencollective.js'),

libs/live-fns/lgtm.js

@@ -0,0 +1,55 @@
+const millify = require('millify')
+
+// Use axios directly as the default Accept header breaks lgtm API
+const axios = require('axios')
+
+module.exports = async (topic, ...args) => {
+  const lang = topic === 'grade' ? args.shift() : undefined
+  const projectId = args.join('/')
+  const endpoint = `https://lgtm.com/api/v0.1/project/${projectId}/details`
+  const data = await axios.create({
+    timeout: 3200
+  }).get(endpoint).then(res => res.data)
+
+  switch (topic) {
+    case 'alerts':
+      return alertsBadge(data)
+    case 'grade':
+      return gradeBadge(data, lang)
+  }
+}
+
+const alertsBadge = (data) => (
+  {
+    subject: 'lgtm',
+    status: `${millify(data.alerts)} alert${(data.alerts === 1 ? '' : 's')}`,
+    color: data.alerts === 0 ? 'green' : 'yellow'
+  }
+)
+
+const gradeBadge = (data, lang) => {
+  for (const languageData of data.languages) {
+    if (languageData.lang === lang && 'grade' in languageData) {
+      const langLabel = langLabelOverrides[lang] || lang
+      return {
+        subject: `code quality: ${langLabel}`,
+        status: languageData.grade,
+        color: gradeColors[languageData.grade] || 'red'
+      }
+    }
+  }
+}
+
+const langLabelOverrides = {
+  cpp: 'c/c++',
+  csharp: 'c#',
+  javascript: 'js/ts'
+}
+
+const gradeColors = {
+  'A+': 'green',
+  'A': '9C0',
+  'B': 'A4A61D',
+  'C': 'yellow',
+  'D': 'orange'
+}