Create CLI questionnaire

.npmignore

@@ -8,4 +8,5 @@ src
 tsconfig.json
 tslint.json
 docs
-.github
+.github
+scripts

bin/cli.js

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+
+const createAction = require('./create-action')
+
+createAction(process.argv.slice(2))
+  .then(() => {
+    process.exit(0)
+  })
+  .catch(error => {
+    console.error(error)
+    process.exit(1)
+  })

bin/colors.json

@@ -0,0 +1,10 @@
+[
+  "white",
+  "yellow",
+  "blue",
+  "green",
+  "orange",
+  "red",
+  "purple",
+  "gray-dark"
+]

bin/create-action.js

@@ -0,0 +1,170 @@
+const fs = require('fs')
+const path = require('path')
+const { promisify } = require('util')
+const minimist = require('minimist')
+const { Signale } = require('signale')
+const { prompt } = require('enquirer')
+const colors = require('./colors.json')
+const icons = require('./feather-icons.json')
+
+const readFile = promisify(fs.readFile)
+const writeFile = promisify(fs.writeFile)
+const mkdir = promisify(fs.mkdir)
+
+const signale = new Signale({
+  config: {
+    displayLabel: false
+  }
+})
+
+/**
+ * Reads a template file from disk.
+ *
+ * @param {string} filename The template filename to read.
+ * @returns {Promise<string>} The template file string contents.
+ */
+async function readTemplate (filename) {
+  const templateDir = path.join(__dirname, 'template')
+  return readFile(path.join(templateDir, filename), 'utf8')
+}
+
+/**
+ * A predicate function to ensure a string is not empty.
+ *
+ * @param {string} value The string value.
+ * @returns {boolean} Whether the string is empty or not.
+ */
+const isNotEmpty = value => value.length > 0
+
+/**
+ * The options object returned from the CLI questionnaire prompt.
+ * @typedef {object} PromptAnswers
+ * @property {string} name The action name.
+ * @property {string} description The action description.
+ * @property {string} icon The feather icon name. See `bin/feather-icons.json` for options.
+ * @property {string} color The GitHub Action color. See `bin/colors.json` for options.
+ */
+
+/**
+ * Prompts the user with a questionnaire to get key metadata for the GitHub Action.
+ *
+ * @returns {Promise<PromptAnswers>} An object containing prompt answers.
+ */
+async function getActionMetadata () {
+  return prompt([
+    {
+      type: 'input',
+      name: 'name',
+      message: 'What is the name of your action?',
+      initial: 'Your action name',
+      validate: isNotEmpty
+    },
+    {
+      type: 'input',
+      name: 'description',
+      message: 'What is a short description of your action?',
+      initial: 'A description of your action',
+      validate: isNotEmpty
+    },
+    {
+      type: 'autocomplete',
+      name: 'icon',
+      message: 'Choose an icon for your action. Visit https://feathericons.com for a visual reference.',
+      choices: icons,
+      limit: 10
+    },
+    {
+      type: 'autocomplete',
+      name: 'color',
+      message: 'Choose a background color background color used in the visual workflow editor for your action.',
+      choices: colors
+    }
+  ])
+}
+
+/**
+ * Creates a Dockerfile contents string, replacing variables in the Dockerfile template
+ * with values passed in by the user from the CLI prompt.
+ *
+ * @param {PromptAnswers} answers The CLI prompt answers.
+ * @returns {Promise<string>} The Dockerfile contents.
+ */
+async function createDockerfile (answers) {
+  const dockerfileTemplate = await readTemplate('Dockerfile')
+  return dockerfileTemplate
+    .replace(':NAME', answers.name)
+    .replace(':DESCRIPTION', answers.description)
+    .replace(':ICON', answers.icon)
+    .replace(':COLOR', answers.color)
+}
+
+/**
+ * Creates a `package.json` object with the latest version
+ * of `actions-toolkit` ready to be installed.
+ *
+ * @param {string} name The action package name.
+ * @returns {object} The `package.json` contents.
+ */
+function createPackageJson (name) {
+  const { version } = require('../package.json')
+  return {
+    name,
+    private: true,
+    main: 'index.js',
+    dependencies: {
+      'actions-toolkit': `^${version}`
+    }
+  }
+}
+
+/**
+ * Runs the create action CLI prompt and bootstraps a new directory for the user.
+ *
+ * @public
+ * @param {string[]} argv The command line arguments to parse.
+ * @returns {Promise<void>} Nothing.
+ */
+module.exports = async function createAction (argv) {
+  const args = minimist(argv)
+  const directoryName = args._[0]
+  if (!directoryName || args.help) {
+    signale.info(`\nUsage: npx actions-toolkit <name>`)
+    return process.exit(1)
+  }
+
+  signale.star('Welcome to actions-toolkit! Let\'s get started creating an action.\n')
+
+  const base = path.join(process.cwd(), directoryName)
+  try {
+    signale.info(`Creating folder ${base}...`)
+    await mkdir(base)
+  } catch (err) {
+    if (err.code === 'EEXIST') {
+      signale.fatal(`Folder ${base} already exists!`)
+    }
+    throw err
+  }
+
+  // Collect answers
+  const metadata = await getActionMetadata()
+
+  signale.log('\n------------------------------------\n')
+
+  // Create the templated files
+  const dockerfile = await createDockerfile(metadata)
+  const packageJson = createPackageJson(directoryName)
+  const entrypoint = await readTemplate('entrypoint.js')
+
+  await Promise.all([
+    ['package.json', JSON.stringify(packageJson, null, 2)],
+    ['Dockerfile', dockerfile],
+    ['entrypoint.js', entrypoint]
+  ].map(async ([filename, contents]) => {
+    signale.info(`Creating ${filename}...`)
+    await writeFile(path.join(base, filename), contents)
+  }))
+
+  signale.log('\n------------------------------------\n')
+  signale.success(`Done! Enjoy building your GitHub Action!`)
+  signale.info(`Get started with:\n\ncd ${directoryName} && npm install`)
+}