使用blessed 开发丰富的cli 应用

blessed 是一个不错的npm 包，可以帮助我们开发出带有丰富ui界面的cli 应用，类似的有subzero

测试环境准备

• 项目结构

├── README.md
├── app.js
├── my-program-icon.png
├── package.json
└── yarn.lock

• package.json 说明

  主要是依赖以及打包npm 的配置

{
  "name": "blessed-project",
  "version": "1.0.0",
  "main": "index.js",
  "bin": "app.js",
  "license": "MIT",
  "dependencies": {
    "blessed": "^0.1.81"
  },
  "scripts": {
    "start": "node app",
    "build": "pkg ."
  },
  "pkg": {
    "scripts": "app.js"
  },
  "devDependencies": {
    "pkg": "^4.3.4"
  }
}

• app.js

  简单的cli 开发代码，来自官方文档

var blessed = require('blessed');// Create a screen object.
var screen = blessed.screen({
  smartCSR: true
});screen.title = 'blessed test';// Create a box perfectly centered horizontally and vertically.
var box = blessed.box({
  top: 'center',
  left: 'center',
  width: '50%',
  height: '50%',
  content: 'hello blessed {bold}world{/bold}!',
  tags: true,
  border: {
    type: 'line'
  },
  style: {
    fg: 'white',
    bg: 'magenta',
    border: {
      fg: '#f0f0f0'
    },
    hover: {
      bg: 'green'
    }
  }
});// Append our box to the screen.
screen.append(box);// Add a png icon to the box
var icon = blessed.image({
  parent: box,
  top: 0,
  left: 0,
  type: 'overlay',
  width: 'shrink',
  height: 'shrink',
  file: __dirname + '/my-program-icon.png',
  search: false
});// If our box is clicked, change the content.
box.on('click', function(data) {
  box.setContent('{center}Some different {red-fg}content{/red-fg}.{/center}');
  screen.render();
});// If box is focused, handle `enter`/`return` and give us some more content.
box.key('enter', function(ch, key) {
  box.setContent('{right}Even different {black-fg}content{/black-fg}.{/right}\n');
  box.setLine(1, 'bar');
  box.insertLine(1, 'foo');
  screen.render();
});// Quit on Escape, q, or Control-C.
screen.key(['escape', 'q', 'C-c'], function(ch, key) {
  return process.exit(0);
});// Focus our element.
box.focus();// Render the screen.
screen.render();

运行

• 直接使用node

node app
or
yarn start

• 使用二进制文件

  pkg 打包的二进制文件

yarn build
linux && mac
./blessed-project-{linux|mac}
windows
blessed-project-win.exe

• 效果
  

说明

使用blessed 我们可以开发出支持丰富界面的cli工具，集成oclif 很更强大，同时也有一个直接可以使用vue react 的插件，这样开发就更简单了