V2 - Implement eject script

packages/crl-scripts/lib/commands/eject.js

@@ -1,15 +1,232 @@
 'use strict'
+const chalk = require('chalk')
+const inquirer = require('inquirer')
+const path = require('path')
+const spawnSync = require('react-dev-utils/crossSpawn').sync
+const execSync = require('child_process').execSync
+const os = require('os')
+const fs = require('fs-extra')
 
-module.exports = (program) => {
+const green = chalk.green
+const cyan = chalk.cyan
+const red = chalk.red
+
+module.exports = program => {
   program
     .command('eject')
     .description('Ejects your library from crl-scripts')
-    .action(async () => {
-      try {
-        console.error('Error this functionality has yet to be implemented.')
-        process.exit(1)
-      } catch (err) {
-        program.handleError(err)
-      }
+    .action(() => {
+      const appDirectory = fs.realpathSync(process.cwd())
+      const getAppPath = relativePath =>
+        path.resolve(appDirectory, relativePath)
+      const getOwnPath = relativePath =>
+        path.resolve(__dirname, '..', relativePath)
+
+      inquirer
+        .prompt({
+          type: 'confirm',
+          name: 'shouldEject',
+          message: 'Are you sure you want to eject? This action is permanent.',
+          default: false
+        })
+        .then(answer => {
+          if (!answer.shouldEject) {
+            console.log(cyan('Close one! Eject aborted.'))
+            return
+          }
+          console.log('Eject Starting')
+
+          const gitStatus = getGitStatus()
+          if (gitStatus) {
+            console.error(
+              red(
+                'This git repository has untracked files or uncommitted changes:'
+              ) +
+                '\n\n' +
+                gitStatus
+                  .split('\n')
+                  .map(line => line.match(/ .*/g)[0].trim())
+                  .join('\n') +
+                '\n\n' +
+                red(
+                  'Remove untracked files, stash or commit any changes, and try again.'
+                )
+            )
+            process.exit(1)
+          }
+
+          const ownPath = getOwnPath('../')
+          const appPath = getAppPath('.')
+
+          function verifyAbsent(file) {
+            if (fs.existsSync(path.join(appPath, file))) {
+              console.error(
+                `\`${file}\` already exists in your app folder. We cannot ` +
+                  'continue as you would lose all the changes in that file or directory. ' +
+                  'Please move or delete it (maybe make a copy for backup) and run this ' +
+                  'command again.'
+              )
+              process.exit(1)
+            }
+          }
+
+          const folders = ['lib', 'lib/commands']
+
+          // Make shallow array of files paths
+          const files = folders.reduce((files, folder) => {
+            return files.concat(
+              fs
+                .readdirSync(path.join(ownPath, folder))
+                // set full path
+                .map(file => path.join(ownPath, folder, file))
+                // omit dirs from file list
+                .filter(file => fs.lstatSync(file).isFile())
+            )
+          }, [])
+
+          folders.forEach(verifyAbsent)
+          files.forEach(verifyAbsent)
+
+          console.log()
+          console.log(cyan(`Copying files into ${appPath}`))
+
+          folders.forEach(folder => {
+            fs.mkdirSync(path.join(appPath, folder))
+          })
+
+          console.log()
+
+          files.forEach(file => {
+            const content = fs.readFileSync(file, 'utf8')
+            console.log(
+              `  Adding ${cyan(file.replace(ownPath, ''))} to the project`
+            )
+            fs.writeFileSync(file.replace(ownPath, appPath), content)
+          })
+          console.log()
+
+          const ownPackage = require(path.join(ownPath, 'package.json'))
+          const appPackage = require(path.join(appPath, 'package.json'))
+
+          console.log(cyan('Updating the dependencies'))
+          const ownPackageName = ownPackage.name
+
+          if (appPackage.devDependencies) {
+            if (appPackage.devDependencies[ownPackageName]) {
+              console.log(
+                `  Removing ${cyan(ownPackageName)} from devDependencies`
+              )
+              delete appPackage.devDependencies[ownPackageName]
+            }
+          }
+          Object.keys(ownPackage.dependencies).forEach(key => {
+            if (
+              ownPackage.optionalDependencies &&
+              ownPackage.optionalDependencies[key]
+            ) {
+              return
+            }
+            console.log(`  Adding ${cyan(key)} to dependencies`)
+            appPackage.dependencies[key] = ownPackage.dependencies[key]
+          })
+          // Sort the deps
+          const unsortedDependencies = appPackage.dependencies
+          appPackage.dependencies = {}
+          Object.keys(unsortedDependencies)
+            .sort()
+            .forEach(key => {
+              appPackage.dependencies[key] = unsortedDependencies[key]
+            })
+          console.log()
+
+          console.log(cyan('Updating the scripts'))
+          delete appPackage.scripts['eject']
+          Object.keys(appPackage.scripts).forEach(key => {
+            Object.keys(ownPackage.bin).forEach(binKey => {
+              const regex = new RegExp(binKey + ' (\\w+)', 'g')
+              if (!regex.test(appPackage.scripts[key])) {
+                return
+              }
+              appPackage.scripts[key] = appPackage.scripts[key].replace(
+                regex,
+                'node lib/cli.js $1'
+              )
+              console.log(
+                `  Replacing ${cyan(`"${binKey} ${key}"`)} with ${cyan(
+                  `"node lib/cli.js ${key}"`
+                )}`
+              )
+            })
+          })
+
+          console.log()
+          console.log(cyan('Configuring package.json'))
+
+          fs.writeFileSync(
+            path.join(appPath, 'package.json'),
+            JSON.stringify(appPackage, null, 2) + os.EOL
+          )
+          console.log()
+
+          // "Don't destroy what isn't ours"
+          if (ownPath.indexOf(appPath) === 0) {
+            try {
+              // remove crl-scripts and crl-scripts binaries from app node_modules
+              Object.keys(ownPackage.bin).forEach(binKey => {
+                console.log(path.join(appPath, 'node_modules', '.bin', binKey))
+                fs.removeSync(
+                  path.join(appPath, 'node_modules', '.bin', binKey)
+                )
+              })
+              fs.removeSync(ownPath)
+            } catch (e) {
+              // It's not essential that this succeeds
+            }
+          }
+
+          if (fs.existsSync(getAppPath('yarn.lock'))) {
+            console.log(cyan('Running yarn...'))
+            spawnSync('yarnpkg', ['--cwd', process.cwd()], {
+              stdio: 'inherit'
+            })
+          } else {
+            console.log(cyan('Running npm install...'))
+            spawnSync('npm', ['install', '--loglevel', 'error'], {
+              stdio: 'inherit'
+            })
+          }
+
+          console.log(green('Ejected successfully!'))
+          console.log()
+
+          if (tryGitAdd(appPath)) {
+            console.log(cyan('Staged ejected files for commit.'))
+            console.log()
+          }
+          console.log()
+        })
     })
 }
+
+function getGitStatus() {
+  try {
+    const stdout = execSync(`git status --porcelain`, {
+      stdio: ['pipe', 'pipe', 'ignore']
+    }).toString()
+    return stdout.trim()
+  } catch (e) {
+    return ''
+  }
+}
+
+function tryGitAdd(appPath) {
+  try {
+    spawnSync('git', ['add', path.join(appPath, 'lib')], {
+      stdio: 'inherit'
+    })
+
+    return true
+  } catch (e) {
+    return false
+  }
+}