Command-line tools can help you with all sorts of tasks. This lesson covers the very basics of setting up a CLI tool in Node.js by creating your project with npm, setting up your bin script, and using CAC to parse a single argument.
Create a new project, change the "name" porp‘s value to "hi", then add a "bin" prop, so next time, when we invoke "hi", it will run the command in "bin".
package.json
{ ?"name": "hi", ?"version": "1.0.0", ?"description": "", ?"main": "index.js", ?"scripts": { ???"test": "echo \"Error: no test specified\" && exit 1" ?}, ?"keywords": [], ?"author": "", ?"license": "ISC", ?"bin": "./index.js", ?"devDependencies": { ???"cac": "6.3.12" ?}}Install:
npm i -D cac
Create index.js file:
- Make sure you have ‘
#!/usr/bin/env node
‘ on the top of the file, then it knows should run in node env. - Using cac to build commad, you can define ‘option‘, ‘command‘
- Last you should always call cli.parse() to run the command
#!/usr/bin/env nodeconst cli = require(‘cac‘)();cli.option(‘--type <type>‘, ‘Provide type, [date|foo]‘)// name is a required fieldcli.command(‘<name>‘, ‘Provide your name‘) ???.action((name, options) => { ???????const {type} = options; ???????if (type === ‘date‘) { ???????????console.log(`Hi ${name}, Today is ${new Date().toDateString()}`) ???????} else if (type === ‘foo‘) { ???????????console.log(`Hi ${name}, you should take a rest!`) ???????} else { ???????????console.log(`Hi ${name}, Good job!`) ???????} ???????????})cli.help()// Display version number when `-h` or `--help` appearscli.version(‘0.0.0‘)cli.parse()Run:
[Tools] Create a Simple CLI Tool in Node.js with CAC
原文地址：https://www.cnblogs.com/Answer1215/p/10220555.html