feat: add support for codecov coverage (#16)

* feat: add support for codecov coverage

Signed-off-by: Charlike Mike Reagent <olsten.larck@gmail.com>

* fix: ensurance for coverage loading

Signed-off-by: Charlike Mike Reagent <olsten.larck@gmail.com>

* chore: remove eslintConfig field

Signed-off-by: Charlike Mike Reagent <olsten.larck@gmail.com>

* fix: codecov badge when unknown repo

Signed-off-by: Charlike Mike Reagent <olsten.larck@gmail.com>

* fix: more safety cast result to string

Signed-off-by: Charlike Mike Reagent <olsten.larck@gmail.com>

libs/live-fns/_index.js

@@ -1,4 +1,5 @@
 module.exports = {
+  'codecov': require('./codecov.js'),
   'appveyor': require('./appveyor.js'),
   'chrome-web-store': require('./chrome-web-store.js'),
   'circleci': require('./circleci.js'),

libs/live-fns/codecov.js

@@ -0,0 +1,63 @@
+const axios = require('../axios.js')
+
+// https://codecov.io/gh/user/repo/settings/badge
+
+/**
+ * `gh` is alias for `github` set by CodeCov
+ * badgen.now.sh/codecov/c/gh/amio/badgen
+ * badgen.now.sh/codecov/c/gh/amio/badgen/master
+ */
+module.exports = async function codecov (method, ...args) {
+  switch (method) {
+    case 'c': {
+      return coverage(...args)
+    }
+    default:
+      return {
+        subject: 'codecov',
+        status: 'unknown',
+        color: 'grey'
+      }
+  }
+}
+
+function getColor (value, orange = 70, yellow = 85, green = 100) {
+  if (value <= 0) {
+    return 'red'
+  }
+  if (value < orange) {
+    return 'ef6c00'
+  }
+  if (value < yellow) {
+    return 'c0ca33'
+  }
+  if (value < green) {
+    return 'a4a61d'
+  }
+  return 'green'
+}
+
+async function coverage (vscType, user, repo, branch) {
+  branch = typeof branch === 'string' && branch.length > 0 ? branch : 'master'
+
+  const args = [vscType, user, repo, 'branch', branch]
+  const endpoint = `https://codecov.io/${args.join('/')}/graph/badge.txt`
+
+  const status = String(await axios.get(endpoint).then(res => res.data)).trim()
+
+  if (status === 'unknown') {
+    return {
+      subject: 'codecov',
+      status: 'unknown',
+      color: 'grey'
+    }
+  }
+
+  const color = getColor(+status)
+
+  return {
+    subject: 'codecov',
+    status: `${status}%`,
+    color
+  }
+}