Question

鉴于以下cli配置，我们可以通过将命令式控件放入动作处理程序中来验证传递的参数。

#!/usr/bin/env node

var program = require('commander');

program
  .command('greet <person>')
  .action((person, cmd) => {
    console.log(`Hello ${person}`);
  })

program.parse(process.argv)

但是，我想知道是否有实际的api：

program.command('greet <Giuseppe|Mick|Bob>');

因此，如果参数不正确，commanderjs将自动抛出。

Answer 1

command参数的原理是它们可以是任何东西，因此必须在action中进行处理。

如果您要使用一组有限的选项，则可能要使用option。

通常可以解决此问题的一种解决方法是使用git-style sub-commands：

#!/usr/bin/env node
// main entry point for the program, let's call it mycmd

const program = require('commander');

program.command('greet', 'greets someone');

program.parse(process.argv);

然后有greet命令文件：

#!/usr/bin/env node
// entry point for `greet` subcommand, named mycmd-greet

const program = require('commander');

// declare all available cases
// (you could also obviously reuse the same function as the action callback)
program
.command('giuseppe')
.action(() => {
  console.log("Hi Giu!");
});
program
.command('mick')
.action(() => {
  console.log("Hey Micky!");
});
program
.command('bob')
.action(() => {
  console.log("That's my Bobby!");
});

// handle `greet` failures here in one shot
program
.command('*')
.action((x) => {
  console.log(`Sorry, I don't know no ${x}.`);
});

program.parse(process.argv);

希望这会有所帮助！

CommanderJS-验证参数

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