开始
我们的命令行工具起名venus-cli，实现功能有：
- 显示当前时间；
- 查询天气；
- 查看本地IP；
创建目录
$ mkdir venus-cli
$ cd venus-cli
$ npm init -y
$ mkdir src
$ cd src
$ touch index.js
问好
1、index.js
#!/usr/bin/env node
console.log("hello venus-cli")
2、执行
$ node src/index.js
//output: hello venus-cli
输出一个漂亮的LOGO
1、安装依赖
$ npm install chalk //在命令行输出各种颜色的文字
$ npm install figlet //在命令行输出艺术字
2、index.js
#!/usr/bin/env node
const chalk = require("chalk");
const figlet = require("figlet");
// 输出一个漂亮的LOGO
console.log(chalk.yellow(figlet.textSync("VENUS-CLI", {
horizontalLayout: "full"
})));
3、执行
$ node src/index.js
output：
__ __ _____ _ _ _ _ ____ ____ _ ___
\ \ / / | ____| | \ | | | | | | / ___| / ___| | | |_ _|
\ \ / / | _| | \| | | | | | \___ \ _____ | | | | | |
\ V / | |___ | |\ | | |_| | ___) | |_____| | |___ | |___ | |
\_/ |_____| |_| \_| \___/ |____/ \____| |_____| |___|
显示当前时间
1、安装依赖
$ npm install yargs //构建可交互的命令行工具
2、index.js
#!/usr/bin/env node
const yargs = require("yargs");
yargs.scriptName("venus-cli")
.usage('$0 [args]')
.command('date', '显示当前日期', (yargs) => {}, function (argv) {
console.log(`Current Date: ${new Date()}`)
})
.help()
.argv
3、执行
node src/test.js date
//output: Current Date: Fri Oct 16 2020 10:57:51 GMT+0800 (China Standard Time)
4、格式化日期输出
$ npm install dayjs
const dayjs = require("dayjs");
const date = dayjs().format('YYYY-MM-DD HH:mm:ss');
查询天气信息
1、安装依赖
$ npm install node-fetch //发起网络请求
2、准备天气API，我们使用和风天气API服务：
a. 获取天气信息接口：
请求：
https://devapi.heweather.net/v7/weather/now?key=ea27fd16a12c45938ae787b4059fdaba&location=101010100
响应：
{
"code": "200",
"updateTime": "2020-10-16T11:11+08:00",
"fxLink": "http://hfx.link/2ax1",
"now": {
"obsTime": "2020-10-16T10:40+08:00",
"temp": "14",
"feelsLike": "11",
"icon": "100",
"text": "晴",
"wind360": "6",
"windDir": "北风",
"windScale": "3",
"windSpeed": "12",
"humidity": "32",
"precip": "0.0",
"pressure": "1021",
"vis": "30",
"cloud": "91",
"dew": "-3"
},
"refer": {
"sources": ["Weather China"],
"license": ["no commercial use"]
}
}
b. 我们只准备几个热门城市
const hotCity = {
"beijing": "101010100",
"shanghai": "101020100",
"tianjin": "101030100",
"hangzhou": "101210101",
"chengdu": "101270101",
"zhenzhou": "101180101"
}
c. 和风天气常用地区列表
https://github.com/qwd/LocationList
3、index.js
const fetch = require("node-fetch");
yargs.scriptName("venus-cli")
.usage('$0 [args]')
.command('weather [city]', '显示天气（默认beijing）', (yargs) => {
yargs.positional('city', {
type: 'string',
default: 'beijing',
describe: '要查询的城市'
})
}, async function (argv) {
const city = argv.city.toLowerCase();
const location = hotCity[city] ? hotCity[city] : '';
if(location){
const res = await fetch(`https://devapi.heweather.net/v7/weather/now?key=ea27fd16a12c45938ae787b4059fdaba&location=${location}`);
const data = await res.json();
if(data.code === '200'){
const now = data.now;
console.log(`${city}: ${now.text}，${now.temp}摄氏度，${now.windDir}`)
} else {
console.log(`Ops, something error!`)
}
} else {
console.log(`${city} does not support.`)
}
})
.help()
.argv
4、执行
$ node src/test.js weather
//output: beijing: 晴，14摄氏度，北风
查看本地IP
1、安装依赖
$ npm install shelljs
2、查询本地IP命令
$ ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6 | awk '{print $2}' | tr -d 'addr:'
// 172.18.0.229
3、index.js
yargs.scriptName("venus-cli")
.usage('$0 [args]')
.command('ip', '显示本地IP', (yargs) => {
}, function (argv) {
var ip_address = shell.exec("ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6 | awk '{print $2}' | tr -d 'addr:'",{silent:true}).stdout;
console.log(`Local IP: ${ip_address}`)
})
.help()
.argv
4、执行
$ node src/test.js ip
//output: Local IP: 172.18.0.229
全局访问脚本
在项目根目录中运行npm link会将符号文件链接到系统路径，从而可以在任何位置访问它。
1、更新package.json
{
"bin": {
"venus-cli": "src/index.js"
},
}
2、npm link
$ cd venus-cli
$ npm link
3、执行
$ cd ~
$ venus-cli --help
/*
venus-cli [args]
Commands:
venus-cli date 显示当前日期
venus-cli weather [city] 显示天气（默认beijing）
venus-cli ip 显示本地IP
Options:
--version Show version number [boolean]
--help Show help
*/
$ venus-cli --version
// 1.0.0
$ venus-cli date
// Current Date: 2020-10-16 11:32:02
$ venus-cli weather
// Beijing: 晴，14摄氏度，北风
$ venus-cli weather tianjin
// Tianjin: 阴，13摄氏度，北风
$ venus-cli ip
// Local IP: 172.18.0.229
项目完整代码
venus-cli
巨人肩上
chalk
https://github.com/chalk/chalk
figlet
https://github.com/patorjk/figlet.js
yargs
https://github.com/yargs/yargs
node-fetch
https://github.com/node-fetch/node-fetch
dayjs
https://github.com/iamkun/dayjs
shelljs
https://github.com/shelljs/shelljs