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cli.ts
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#!/usr/bin/env node
// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import url from 'node:url'
import {
$,
ProcessOutput,
updateArgv,
fetch,
chalk,
minimist,
fs,
path,
VERSION,
} from './index.js'
import { installDeps, parseDeps } from './deps.js'
import { randomId } from './util.js'
import { createRequire } from './vendor.js'
const EXT = '.mjs'
isMain() &&
main().catch((err) => {
if (err instanceof ProcessOutput) {
console.error('Error:', err.message)
} else {
console.error(err)
}
process.exitCode = 1
})
export function printUsage() {
// language=txt
console.log(`
${chalk.bold('zx ' + VERSION)}
A tool for writing better scripts
${chalk.bold('Usage')}
zx [options] <script>
${chalk.bold('Options')}
--quiet suppress any outputs
--verbose enable verbose mode
--shell=<path> custom shell binary
--prefix=<command> prefix all commands
--postfix=<command> postfix all commands
--cwd=<path> set current directory
--eval=<js>, -e evaluate script
--ext=<.mjs> default extension
--install, -i install dependencies
--registry=<URL> npm registry, defaults to https://registry.npmjs.org/
--version, -v print current zx version
--help, -h print help
--repl start repl
--experimental enables experimental features (deprecated)
${chalk.italic('Full documentation:')} ${chalk.underline('https://google.github.io/zx/')}
`)
}
export const argv: minimist.ParsedArgs = minimist(process.argv.slice(2), {
string: ['shell', 'prefix', 'postfix', 'eval', 'cwd', 'ext', 'registry'],
boolean: [
'version',
'help',
'quiet',
'verbose',
'install',
'repl',
'experimental',
],
alias: { e: 'eval', i: 'install', v: 'version', h: 'help' },
stopEarly: true,
})
export async function main() {
await import('./globals.js')
argv.ext = normalizeExt(argv.ext)
if (argv.cwd) $.cwd = argv.cwd
if (argv.verbose) $.verbose = true
if (argv.quiet) $.quiet = true
if (argv.shell) $.shell = argv.shell
if (argv.prefix) $.prefix = argv.prefix
if (argv.postfix) $.postfix = argv.postfix
if (argv.version) {
console.log(VERSION)
return
}
if (argv.help) {
printUsage()
return
}
if (argv.repl) {
await (await import('./repl.js')).startRepl()
return
}
if (argv.eval) {
await runScript(argv.eval, argv.ext)
return
}
const firstArg = argv._[0]
updateArgv(argv._.slice(firstArg === undefined ? 0 : 1))
if (!firstArg || firstArg === '-') {
const success = await scriptFromStdin(argv.ext)
if (!success) {
printUsage()
process.exitCode = 1
}
return
}
if (/^https?:/.test(firstArg)) {
await scriptFromHttp(firstArg, argv.ext)
return
}
const filepath = firstArg.startsWith('file:///')
? url.fileURLToPath(firstArg)
: path.resolve(firstArg)
await importPath(filepath)
}
export async function runScript(script: string, ext = EXT) {
const filepath = path.join($.cwd ?? process.cwd(), `zx-${randomId()}${ext}`)
await writeAndImport(script, filepath)
}
export async function scriptFromStdin(ext?: string): Promise<boolean> {
let script = ''
if (!process.stdin.isTTY) {
process.stdin.setEncoding('utf8')
for await (const chunk of process.stdin) {
script += chunk
}
if (script.length > 0) {
await runScript(script, ext)
return true
}
}
return false
}
export async function scriptFromHttp(remote: string, _ext = EXT) {
const res = await fetch(remote)
if (!res.ok) {
console.error(`Error: Can't get ${remote}`)
process.exit(1)
}
const script = await res.text()
const pathname = new URL(remote).pathname
const name = path.basename(pathname)
const ext = path.extname(pathname) || _ext
const cwd = $.cwd ?? process.cwd()
const filepath = path.join(cwd, `${name}-${randomId()}${ext}`)
await writeAndImport(script, filepath)
}
export async function writeAndImport(
script: string | Buffer,
filepath: string,
origin = filepath
) {
await fs.writeFile(filepath, script.toString())
try {
process.once('exit', () => fs.rmSync(filepath, { force: true }))
await importPath(filepath, origin)
} finally {
await fs.rm(filepath)
}
}
export async function importPath(
filepath: string,
origin = filepath
): Promise<void> {
const ext = path.extname(filepath)
const base = path.basename(filepath)
const dir = path.dirname(filepath)
if (ext === '') {
const tmpFilename = fs.existsSync(`${filepath}.mjs`)
? `${base}-${randomId()}.mjs`
: `${base}.mjs`
return writeAndImport(
await fs.readFile(filepath),
path.join(dir, tmpFilename),
origin
)
}
if (ext === '.md') {
return writeAndImport(
transformMarkdown(await fs.readFile(filepath)),
path.join(dir, base + '.mjs'),
origin
)
}
if (argv.install) {
const deps = parseDeps(await fs.readFile(filepath))
await installDeps(deps, dir, argv.registry)
}
injectGlobalRequire(origin)
// TODO: fix unanalyzable-dynamic-import to work correctly with jsr.io
await import(url.pathToFileURL(filepath).toString())
}
export function injectGlobalRequire(origin: string) {
const __filename = path.resolve(origin)
const __dirname = path.dirname(__filename)
const require = createRequire(origin)
Object.assign(globalThis, { __filename, __dirname, require })
}
export function transformMarkdown(buf: Buffer): string {
const source = buf.toString()
const output = []
let state = 'root'
let codeBlockEnd = ''
let prevLineIsEmpty = true
const jsCodeBlock = /^(```{1,20}|~~~{1,20})(js|javascript)$/
const shCodeBlock = /^(```{1,20}|~~~{1,20})(sh|shell|bash)$/
const otherCodeBlock = /^(```{1,20}|~~~{1,20})(.*)$/
for (const line of source.split(/\r?\n/)) {
switch (state) {
case 'root':
if (/^( {4}|\t)/.test(line) && prevLineIsEmpty) {
output.push(line)
state = 'tab'
} else if (jsCodeBlock.test(line)) {
output.push('')
state = 'js'
codeBlockEnd = line.match(jsCodeBlock)![1]
} else if (shCodeBlock.test(line)) {
output.push('await $`')
state = 'bash'
codeBlockEnd = line.match(shCodeBlock)![1]
} else if (otherCodeBlock.test(line)) {
output.push('')
state = 'other'
codeBlockEnd = line.match(otherCodeBlock)![1]
} else {
prevLineIsEmpty = line === ''
output.push('// ' + line)
}
break
case 'tab':
if (line === '') {
output.push('')
} else if (/^( +|\t)/.test(line)) {
output.push(line)
} else {
output.push('// ' + line)
state = 'root'
}
break
case 'js':
if (line === codeBlockEnd) {
output.push('')
state = 'root'
} else {
output.push(line)
}
break
case 'bash':
if (line === codeBlockEnd) {
output.push('`')
state = 'root'
} else {
output.push(line)
}
break
case 'other':
if (line === codeBlockEnd) {
output.push('')
state = 'root'
} else {
output.push('// ' + line)
}
break
}
}
return output.join('\n')
}
export function isMain(
metaurl: string = import.meta.url,
scriptpath: string = process.argv[1]
): boolean {
if (metaurl.startsWith('file:')) {
const modulePath = url.fileURLToPath(metaurl).replace(/\.\w+$/, '')
const mainPath = fs.realpathSync(scriptpath).replace(/\.\w+$/, '')
return mainPath === modulePath
}
return false
}
export function normalizeExt(ext?: string): string | undefined {
return ext ? path.parse(`foo.${ext}`).ext : ext
}