tplb

index.js

#!/usr/bin/env node

const fs = require("fs")
const path = require("path")
const acorn = require("acorn")
const walk = require("acorn-walk")

const getDirFiles = (dir) =>
	fs
		.readdirSync(dir, { withFileTypes: true })
		.filter((e) => e.isFile())
		.map((e) => e.name)

const checkDir = (dir) => {
	try {
		if (fs.statSync(dir).isDirectory()) return true
	} catch (err) {}
	throw new Error(`"${dir}" フォルダがみつかりませんでした`)
}

const createRequirePath = (from_dir, to_dir, name) => {
	const dir = path.relative(from_dir, to_dir) || "."
	return dir + path.sep + name
}

const build = (src, dst, helper) => {
	for (const dir of [src, dst, helper]) checkDir(dir)

	const helpers = getDirFiles(helper)

	for (const name of getDirFiles(src)) {
		const filepath = path.join(src, name)
		const tpl = fs.readFileSync(filepath).toString().trim()
		const ext = path.extname(name).slice(1)

		const js = ext + "`" + tpl + "`"
		let tree
		try {
			tree = acorn.parse(js, { ecmaVersion: 2020 })
		} catch (err) {
			console.error(`"${filepath}" ファイルにエラーがあります`)
			throw err
		}

		const requires = new Set()

		walk.simple(tree, {
			Identifier(node) {
				if (node.name !== "$") {
					requires.add(node.name)
				}
			},
		})

		const require_code = Array.from(requires, (name) => {
			const jsname = name + ".js"
			const is_helper = helpers.includes(name + ".js")
			const module_path = createRequirePath(dst, is_helper ? helper : dst, jsname)
			return `const ${name} = require(${JSON.stringify(module_path)})\n`
		}).join("")

		const output_js = require_code + `module.exports = $ => ({ [ext]: ${js} })`
		const output_name = name.slice(0, -path.extname(name).length) + ".js"

		fs.writeFileSync(path.join(dst, output_name), output_js)
	}
}

if (require.main === module) {
	const { options } = process.argv.slice(2).reduce(
		(a, b) => {
			if (b === "--src") {
				a.ctx = "src"
			} else if (b === "--dst") {
				a.ctx = "dst"
			} else if (b === "--helper") {
				a.ctx = "helper"
			} else if (b === "--help") {
				a.options.help = true
				a.ctx = null
			} else {
				if (a.ctx) {
					a.options[a.ctx] = b
					a.ctx = null
				} else {
					console.error(`コマンドライン引数エラー:`, b)
					a.options.help = true
				}
			}
			return a
		},
		{
			options: {},
			ctx: null,
		}
	)

	if (options.help) {
		console.log(" Usage:")
		console.log("   node <thisfile> --src /path/to/src --dst /path/to/dst --helper /path/to/helper")
		return
	}

	const src = path.resolve(options.src || "src")
	const dst = path.resolve(options.dst || "dst")
	const helper = path.resolve(options.helper || "helper")
	console.log("src: ", src)
	console.log("dst: ", dst)
	console.log("helper: ", helper)
	build(src, dst, helper)
	console.log("done")
}

package.json

{
  "dependencies": {
    "acorn": "^6.4.2",
    "acorn-walk": "^8.0.0"
  },
  "name": "tplb",
  "version": "0.0.1",
  "bin": "index.js"
}

yarn.lock

# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1


acorn-walk@^8.0.0:
  version "8.0.0"
  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-8.0.0.tgz#56ae4c0f434a45fff4a125e7ea95fa9c98f67a16"
  integrity sha512-oZRad/3SMOI/pxbbmqyurIx7jHw1wZDcR9G44L8pUVFEomX/0dH89SrM1KaDXuv1NpzAXz6Op/Xu/Qd5XXzdEA==

acorn@^6.4.2:
  version "6.4.2"
  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.2.tgz#35866fd710528e92de10cf06016498e47e39e1e6"
  integrity sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ==