Add vercel-sapper command to configure a project for Vercel

README.md

@@ -7,7 +7,15 @@ Vercel builder for Sapper with SSR enabled
 * [x] Deploy your Sapper app as a Lambda in 30 seconds.
 * [x] Serve all static assets from a CDN.
 
-## Basic usage
+## Automatic configuration
+
+Run `npx vercel-sapper` on an existing project.
+
+Or create a new project with `npx vercel-sapper my-project`
+
+_🧪  This feature is experimental, let us know what you think => https://github.com/thgh/vercel-sapper/pull/47_
+
+## Manual configuration
 
 You must make 3 changes to your project to get started:
 

bin.js

@@ -0,0 +1,144 @@
+#!/usr/bin/env node
+
+const fs = require('fs')
+const { join } = require('path')
+
+;(async () => {
+  console.log(
+    yellow(
+      '🧪  This feature is experimental, let us know what you think' +
+        '=> https://github.com/thgh/vercel-sapper/pull/47\n'
+    )
+  )
+  // Fallback to current working directory
+  const dir = process.argv[2] || '.'
+
+  // TODO: Create a new project if the directory is empty
+  // Create a new project if the directory does not exist
+  if (!fs.existsSync(dir)) {
+    await degit(dir)
+  }
+
+  // Configure the project for Vercel
+  patch(dir)
+
+  console.log(green('\nDeploy your Sapper project:\n'))
+  console.log('    cd', dir)
+  console.log('    vercel\n')
+})()
+
+function degit(dir) {
+  return new Promise((resolve) => {
+    console.log(green('degit'), `sveltejs/sapper-template#rollup`)
+    require('child_process').execFile(
+      'npx',
+      ['degit', 'sveltejs/sapper-template#rollup', dir],
+      (err, stdout, stderr) => {
+        if (err) {
+          console.error(red('something went wrong with degit'), err)
+          return
+        }
+
+        stdout && console.log(stdout.trim())
+        stderr && console.log(stderr.trim())
+        console.log(green('Created'), `Sapper project in ${dir}`)
+        resolve()
+      }
+    )
+  })
+}
+
+async function patch(dir) {
+  try {
+    if (!fs.existsSync(join(dir, 'src/server.js'))) {
+      throw new Error(
+        'expected src/server.js to exist, is this really a Sapper project?'
+      )
+    }
+    const server = fs.readFileSync(join(dir, 'src/server.js'), 'utf8')
+    fs.writeFileSync(join(dir, 'src/server.js'), patchServer(server))
+    console.log(green('Patched'), 'src/server.js')
+  } catch (e) {
+    console.error(red(e.message))
+  }
+
+  try {
+    if (fs.existsSync(join(dir, 'vercel.json'))) {
+      throw new Error('vercel.json already exists')
+    }
+    fs.writeFileSync(
+      join(dir, 'vercel.json'),
+      `{
+  "version": 2,
+  "builds": [
+    {
+      "src": "package.json",
+      "use": "vercel-sapper"
+    }
+  ]
+}`
+    )
+    console.log(green('Created'), 'vercel.json')
+  } catch (e) {
+    console.error(red(e.message))
+  }
+
+  try {
+    if (fs.existsSync(join(dir, '.vercelignore'))) {
+      throw new Error('.vercelignore already exists')
+    }
+    fs.writeFileSync(
+      join(dir, '.vercelignore'),
+      `__sapper__
+cypress
+node_modules`
+    )
+    console.log(green('Created'), '.vercelignore')
+  } catch (e) {
+    console.error(red(e.message))
+  }
+}
+
+function patchServer(server) {
+  if (server.includes('export default')) {
+    throw new Error('src/server.js was already patched')
+  }
+  if (server.includes('module.exports')) {
+    throw new Error('src/server.js was already patched')
+  }
+  if (!server.includes('polka()') && !server.includes('express()')) {
+    throw new Error('src/server.js should contain polka() or express()')
+  }
+
+  // Simplest case
+  if (server.includes('\npolka()')) {
+    return server.replace('\npolka()', '\nexport default polka()')
+  }
+  if (server.includes('\nexpress()')) {
+    return server.replace('\nexpress()', '\nexport default express()')
+  }
+
+  // Server is assigned to variable
+  if (server.includes('= polka()')) {
+    return server.replace('= polka()', '= (module.exports = polka())')
+  }
+  if (server.includes('= express()')) {
+    return server.replace('= express()', '= (module.exports = express())')
+  }
+
+  throw new Error(
+    'src/server.js needs manual patch: https://www.npmjs.com/package/vercel-sapper#manual-configuration'
+  )
+}
+
+function red(text) {
+  return '\u001b[1m\u001b[31m' + text + '\u001b[39m\u001b[22m'
+}
+
+function green(text) {
+  return '\u001b[1m\u001b[32m' + text + '\u001b[39m\u001b[22m'
+}
+
+function yellow(text) {
+  return '\u001b[1m\u001b[33m' + text + '\u001b[39m\u001b[22m'
+}

package.json

@@ -4,7 +4,11 @@
   "license": "MIT",
   "description": "Vercel builder for Sapper with SSR enabled",
   "main": "index.js",
+  "bin": {
+    "vercel-sapper": "./bin.js"
+  },
   "files": [
+    "bin.js",
     "index.js",
     "lib",
     "yarn.lock"