nodejs命令行參數(shù)處理模塊commander使用實例

更新時間：2014年09月17日 09:45:30 作者：鄉(xiāng)村運維

這篇文章主要介紹了nodejs命令行參數(shù)處理模塊commander使用實例,commander是一個非常高大上的令行參數(shù)處理模塊,需要的朋友可以參考下

誠然，之前處理都是使用內(nèi)置的process.agrv ,這個能work，但是不好使，于是tj大神給寫了一個，my god,完全的高大上：

1、安裝

復(fù)制代碼代碼如下:

npm install commander

2、option 解析

Options with commander are defined with the .option() method, also serving as documentation for the options. The example below parses args and options from process.argv, leaving remaining args as the program.args array which were not consumed by options.

復(fù)制代碼代碼如下:

#!/usr/bin/env node

/**

 * Module dependencies.

 */

var program = require('commander');

program

  .version('0.0.1')

  .option('-p, --peppers', 'Add peppers')

  .option('-P, --pineapple', 'Add pineapple')

  .option('-b, --bbq', 'Add bbq sauce')

  .option('-c, --cheese [type]', 'Add the specified type of cheese [marble]', 'marble')

  .parse(process.argv);

console.log('you ordered a pizza with:');

if (program.peppers) console.log('  - peppers');

if (program.pineapple) console.log('  - pineapple');

if (program.bbq) console.log('  - bbq');

console.log('  - %s cheese', program.cheese);

Short flags may be passed as a single arg, for example -abc is equivalent to -a -b -c. Multi-word options such as “–template-engine” are camel-cased, becoming program.templateEngine etc.

3、自動生成help信息

復(fù)制代碼代碼如下:

$ ./examples/pizza --help

  Usage: pizza [options]

  Options:

    -V, --version        output the version number

    -p, --peppers        Add peppers

    -P, --pineapple      Add pineapple

    -b, --bbq            Add bbq sauce

    -c, --cheese <type>  Add the specified type of cheese [marble]

    -h, --help           output usage information

當(dāng)然你也可以手動生成：

復(fù)制代碼代碼如下:

#!/usr/bin/env node

/**

 * Module dependencies.

 */

var program = require('../');

function list(val) {

  return val.split(',').map(Number);

}

program

  .version('0.0.1')

  .option('-f, --foo', 'enable some foo')

  .option('-b, --bar', 'enable some bar')

  .option('-B, --baz', 'enable some baz');

// must be before .parse() since

// node's emit() is immediate

program.on('--help', function(){

  console.log('  Examples:');

  console.log('');

  console.log('    $ custom-help --help');

  console.log('    $ custom-help -h');

  console.log('');

});

program.parse(process.argv);

console.log('stuff');

4、舉個完整的例子

復(fù)制代碼代碼如下:

function range(val) {

  return val.split('..').map(Number);

}

function list(val) {

  return val.split(',');

}

function collect(val, memo) {

  memo.push(val);

  return memo;

}

function increaseVerbosity(v, total) {

  return total + 1;

}

program

  .version('0.0.1')

  .usage('[options] <file ...>')

  .option('-i, --integer <n>', 'An integer argument', parseInt)

  .option('-f, --float <n>', 'A float argument', parseFloat)

  .option('-r, --range <a>..<b>', 'A range', range)

  .option('-l, --list <items>', 'A list', list)

  .option('-o, --optional [value]', 'An optional value')

  .option('-c, --collect [value]', 'A repeatable value', collect, [])

  .option('-v, --verbose', 'A value that can be increased', increaseVerbosity, 0)

  .parse(process.argv);

console.log(' int: %j', program.integer);

console.log(' float: %j', program.float);

console.log(' optional: %j', program.optional);

program.range = program.range || [];

console.log(' range: %j..%j', program.range[0], program.range[1]);

console.log(' list: %j', program.list);

console.log(' collect: %j', program.collect);

console.log(' verbosity: %j', program.verbose);

console.log(' args: %j', program.args);