feat: add commitlint action

.prettierrc

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+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": false,
+  "singleQuote": true
+}

Dockerfile

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+FROM node:10
+
+COPY package*.json /
+
+RUN npm ci --production
+
+COPY . .
+
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'Commitlint'
+description: 'Lints commit messages with commitlint'
+author: 'Wagner Santos'
+inputs:
+  configFile:
+    description: 'commitlint config file'
+    default: './commitlint.config.js'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: 'check-square'
+  color: 'blue'

entrypoint.sh

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+#!/bin/sh
+
+set -e
+
+cd ${GITHUB_WORKSPACE}
+
+NODE_PATH=/node_modules node /run.js

package.json

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+{
+  "name": "commitlint-gh-actions",
+  "version": "1.0.0",
+  "description": "commitlint github action",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "commitlint": "NODE_PATH=/home/wagner/workdir/moteefe/easynvest-crawler/.github/actions/commitlint/node_modules commitlint"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/bennypowers/commitlint-gh-actions.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/bennypowers/commitlint-gh-actions/issues"
+  },
+  "homepage": "https://github.com/bennypowers/commitlint-gh-actions#readme",
+  "dependencies": {
+    "@actions/core": "1.1.1",
+    "@actions/exec": "1.0.1",
+    "@actions/github": "1.1.0",
+    "@commitlint/cli": "8.1.0",
+    "@commitlint/config-angular": "8.2.0",
+    "@commitlint/config-conventional": "7.6.0",
+    "@commitlint/config-lerna-scopes": "8.2.0",
+    "@commitlint/config-patternplate": "8.2.0",
+    "@commitlint/format": "8.2.0",
+    "@commitlint/lint": "8.2.0",
+    "@commitlint/load": "8.2.0",
+    "@commitlint/read": "8.2.0",
+    "chalk": "2.4.2",
+    "commitlint-config-jira": "1.0.9",
+    "conventional-changelog-lint-config-canonical": "1.0.0"
+  },
+  "devDependencies": {
+    "husky": "3.0.7",
+    "prettier": "1.18.2",
+    "pretty-quick": "1.11.1"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "pretty-quick --staged"
+    }
+  }
+}

run.js

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+const { existsSync } = require('fs')
+const { resolve } = require('path')
+const core = require('@actions/core')
+const github = require('@actions/github')
+const read = require('@commitlint/read')
+const lint = require('@commitlint/lint')
+const { format } = require('@commitlint/format')
+const load = require('@commitlint/load')
+const chalk = require('chalk')
+
+const githubToken = process.env.GITHUB_TOKEN
+
+const configPath = resolve(
+  process.env.GITHUB_WORKSPACE,
+  core.getInput('configFile'),
+)
+
+const getRangeFromPullRequest = async () => {
+  const octokit = new github.GitHub(githubToken)
+  const { owner, repo, number } = github.context.issue
+  const { data: commits } = await octokit.pulls.listCommits({
+    owner,
+    repo,
+    pull_number: number,
+  })
+  const commitShas = commits.map(commit => commit.sha)
+  const [from] = commitShas
+  const to = commitShas[commitShas.length - 1]
+
+  return [from, to]
+}
+
+const showLintResults = async ([from, to]) => {
+  const commits = await read({ from, to })
+  const config = existsSync(configPath) ? await load(require(configPath)) : {}
+  const results = await Promise.all(
+    commits.map(commit => lint(commit, config.rules)),
+  )
+  const formattedResults = format(
+    { results },
+    {
+      color: true,
+      helpUrl:
+        'https://github.com/conventional-changelog/commitlint/#what-is-commitlint',
+    },
+  )
+
+  if (formattedResults.length) {
+    process.stderr.write(formattedResults)
+    process.exit(1)
+  } else {
+    console.log(chalk.green('Lint free! 🎉'))
+  }
+}
+
+const exitWithMessage = message => error => {
+  console.log(chalk.red(message))
+  console.error(error)
+  process.exit(1)
+}
+
+const main = () =>
+  getRangeFromPullRequest()
+    .catch(
+      exitWithMessage("error trying to get list of pull request's commits"),
+    )
+    .then(showLintResults)
+    .catch(exitWithMessage('error running commitlint'))
+
+main()