feat: first version of the slackbot

This commit adds the basic features:

- Connect to slack
- Check periodically for PRs
- Post a message to all specified slack channels listing the PRs

.gitignore

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+.DS_Store
+node_modules

.travis.yml

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+sudo: false
+language: node_js
+node_js:
+  - stable
+  - 6

index.js

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+require('./lib/server')()

lib/server.js

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+const Slackbot = require('slackbots')
+const pullhub = require('pullhub')
+const debounce = require('lodash.debounce')
+
+module.exports = function server () {
+  const requiredEnvs = ['SLACK_TOKEN', 'GH_TOKEN', 'SLACK_CHANNELS', 'GH_REPOS']
+
+  if (!requiredEnvs.every((k) => !!process.env[k])) {
+    throw (
+      new Error('Missing one of this required ENV vars: ' + requiredEnvs.join(','))
+    )
+  }
+
+  const channels = process.env.SLACK_CHANNELS.split(',') || []
+  const repos = process.env.GH_REPOS.split(',') || []
+  const labels = process.env.GH_LABELS
+  const checkInterval = process.env.CHECK_INTERVAL || 3600000 // 1 hour default
+
+  const bot = new Slackbot({
+    token: process.env.SLACK_TOKEN,
+    name: process.env.SLACK_BOT_NAME || 'PR-Police'
+  })
+
+  bot.on('start', () => {
+    checkForPRs()
+    debounce(checkForPRs, checkInterval)
+  })
+
+  function checkForPRs () {
+    pullhub(repos, labels)
+      .then((prs) => {
+        const message = buildMessage(prs)
+        return notify(message)
+      })
+      .catch((err) => {
+        console.error(err)
+      })
+  }
+
+  function buildMessage (data) {
+    const message = data.map((item) => {
+      return `#${item.number} - ${item.title} | ${item.html_url}`
+    })
+
+    return message.join('\n')
+  }
+
+  function notify (message) {
+    channels.map((channel) => {
+      bot.postMessageToChannel(channel, message)
+    })
+  }
+}

package.json

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+{
+  "name": "pr-police",
+  "version": "1.0.0",
+  "description": "Slackbot that warns about open pull requests with given labels",
+  "main": "index.js",
+  "scripts": {
+    "pretest": "standard",
+    "test": "tape test/*.js | faucet",
+    "start": "node index.js"
+  },
+  "keywords": [
+    "slackbot",
+    "pull",
+    "request",
+    "github",
+    "labels"
+  ],
+  "author": "rogeriopvl",
+  "license": "MIT",
+  "dependencies": {
+    "lodash.debounce": "^4.0.8",
+    "pullhub": "^1.0.1",
+    "slackbots": "^1.0.2"
+  },
+  "devDependencies": {
+    "faucet": "^0.0.1",
+    "proxyquire": "^1.7.11",
+    "sinon": "^2.1.0",
+    "standard": "^10.0.2",
+    "tape": "^4.6.3"
+  }
+}