npm install feature

npm/install.js

@@ -0,0 +1,67 @@
+'use strict'
+
+const ora = require('ora')('Initializing...').start()
+const Promise = require('bluebird')
+const fs = Promise.promisifyAll(require('fs-extra'))
+const https = require('follow-redirects').https
+const path = require('path')
+const pm2 = Promise.promisifyAll(require('pm2'))
+const tar = require('tar')
+const zlib = require('zlib')
+const _ = require('lodash')
+
+let installDir = path.resolve(__dirname, '../..')
+
+/**
+ * Fetch version from npm package
+ */
+fs.readJsonAsync('package.json').then((packageObj) => {
+  let remoteURL = _.replace('https://github.com/Requarks/wiki/releases/download/v{0}/wiki-js.tar.gz', '{0}', packageObj.version)
+
+  return new Promise((resolve, reject) => {
+    /**
+     * Fetch tarball
+     */
+    ora.text = 'Looking for latest release...'
+    https.get(remoteURL, resp => {
+      if (resp.statusCode !== 200) {
+        return reject(new Error('Remote file not found'))
+      }
+      ora.text = 'Install tarball found. Downloading...'
+
+      /**
+       * Extract tarball
+       */
+      resp.pipe(zlib.createGunzip())
+      .pipe(tar.Extract({ path: installDir }))
+      .on('error', err => reject(err))
+      .on('end', () => {
+        ora.text = 'Tarball extracted successfully.'
+        resolve(true)
+      })
+    })
+  })
+}).then(() => {
+  fs.accessAsync(path.join(installDir, 'config.yml')).then(() => {
+    /**
+     * Upgrade mode
+     */
+    ora.text = 'Upgrade succeeded. Reloading Wiki.js...'
+    return pm2.restartAsync('wiki').catch(err => { // eslint-disable-line handle-callback-err
+      return new Error('Unable to restart Wiki.js via pm2... Do a manual restart!')
+    }).then(() => {
+      ora.succeed('Wiki.js has restarted. Upgrade completed.')
+    })
+  }).catch(err => {
+    /**
+     * Install mode
+     */
+    if (err.code === 'ENOENT') {
+      ora.succeed('Installation succeeded. You can now continue with the configuration steps. Check out https://docs.wiki.requarks.io/install for more info.')
+    } else {
+      return err
+    }
+  })
+}).catch(err => {
+  ora.fail(err)
+})