nodejs命令行参数处理模块commander使用实例

诚然，之前处理都是使用内置的process.agrv,这个能work，但是不好使，于是tj大神给写了一个，my god,完全的高大上：

1、安装

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.

代码如下:

/**

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、自动 生成help信息

代码如下:

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 Add the specified type of cheese [marble]
-h,--help output usage information

当然你也可以手动生成：

代码如下:

/**

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');