301 lines
8.6 KiB
Markdown
301 lines
8.6 KiB
Markdown
# Commander.js
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[](http://travis-ci.org/tj/commander.js)
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[](https://www.npmjs.org/package/commander)
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[](https://www.npmjs.org/package/commander)
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The complete solution for [node.js](http://nodejs.org) command-line interfaces, inspired by Ruby's [commander](https://github.com/tj/commander).
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[API documentation](http://tj.github.com/commander.js/)
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## Installation
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$ npm install commander
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## Option parsing
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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.
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```js
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#!/usr/bin/env node
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/**
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* Module dependencies.
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*/
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var program = require('commander');
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program
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.version('0.0.1')
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.option('-p, --peppers', 'Add peppers')
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.option('-P, --pineapple', 'Add pineapple')
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.option('-b, --bbq', 'Add bbq sauce')
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.option('-c, --cheese [type]', 'Add the specified type of cheese [marble]', 'marble')
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.parse(process.argv);
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console.log('you ordered a pizza with:');
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if (program.peppers) console.log(' - peppers');
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if (program.pineapple) console.log(' - pineapple');
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if (program.bbq) console.log(' - bbq');
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console.log(' - %s cheese', program.cheese);
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```
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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.
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## Coercion
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```js
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function range(val) {
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return val.split('..').map(Number);
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}
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function list(val) {
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return val.split(',');
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}
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function collect(val, memo) {
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memo.push(val);
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return memo;
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}
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function increaseVerbosity(v, total) {
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return total + 1;
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}
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program
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.version('0.0.1')
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.usage('[options] <file ...>')
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.option('-i, --integer <n>', 'An integer argument', parseInt)
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.option('-f, --float <n>', 'A float argument', parseFloat)
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.option('-r, --range <a>..<b>', 'A range', range)
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.option('-l, --list <items>', 'A list', list)
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.option('-o, --optional [value]', 'An optional value')
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.option('-c, --collect [value]', 'A repeatable value', collect, [])
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.option('-v, --verbose', 'A value that can be increased', increaseVerbosity, 0)
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.parse(process.argv);
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console.log(' int: %j', program.integer);
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console.log(' float: %j', program.float);
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console.log(' optional: %j', program.optional);
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program.range = program.range || [];
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console.log(' range: %j..%j', program.range[0], program.range[1]);
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console.log(' list: %j', program.list);
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console.log(' collect: %j', program.collect);
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console.log(' verbosity: %j', program.verbose);
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console.log(' args: %j', program.args);
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```
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## Variadic arguments
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The last argument of a command can be variadic, and only the last argument. To make an argument variadic you have to
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append `...` to the argument name. Here is an example:
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```js
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#!/usr/bin/env node
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/**
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* Module dependencies.
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*/
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var program = require('commander');
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program
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.version('0.0.1')
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.command('rmdir <dir> [otherDirs...]')
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.action(function (dir, otherDirs) {
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console.log('rmdir %s', dir);
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if (otherDirs) {
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otherDirs.forEach(function (oDir) {
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console.log('rmdir %s', oDir);
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});
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}
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});
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program.parse(process.argv);
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```
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An `Array` is used for the value of a variadic argument. This applies to `program.args` as well as the argument passed
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to your action as demonstrated above.
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## Git-style sub-commands
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```js
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// file: ./examples/pm
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var program = require('..');
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program
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.version('0.0.1')
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.command('install [name]', 'install one or more packages')
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.command('search [query]', 'search with optional query')
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.command('list', 'list packages installed')
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.parse(process.argv);
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```
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When `.command()` is invoked with a description argument, no `.action(callback)` should be called to handle sub-commands, otherwise there will be an error. This tells commander that you're going to use separate executables for sub-commands, much like `git(1)` and other popular tools.
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The commander will try to find the executable script in __current directory__ with the name `scriptBasename-subcommand`, like `pm-install`, `pm-search`.
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## Automated --help
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The help information is auto-generated based on the information commander already knows about your program, so the following `--help` info is for free:
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```
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$ ./examples/pizza --help
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Usage: pizza [options]
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An application for pizzas ordering
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Options:
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-h, --help output usage information
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-V, --version output the version number
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-p, --peppers Add peppers
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-P, --pineapple Add pineapple
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-b, --bbq Add bbq sauce
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-c, --cheese <type> Add the specified type of cheese [marble]
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-C, --no-cheese You do not want any cheese
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```
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## Custom help
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You can display arbitrary `-h, --help` information
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by listening for "--help". Commander will automatically
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exit once you are done so that the remainder of your program
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does not execute causing undesired behaviours, for example
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in the following executable "stuff" will not output when
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`--help` is used.
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```js
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#!/usr/bin/env node
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/**
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* Module dependencies.
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*/
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var program = require('commander');
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program
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.version('0.0.1')
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.option('-f, --foo', 'enable some foo')
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.option('-b, --bar', 'enable some bar')
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.option('-B, --baz', 'enable some baz');
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// must be before .parse() since
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// node's emit() is immediate
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program.on('--help', function(){
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console.log(' Examples:');
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console.log('');
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console.log(' $ custom-help --help');
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console.log(' $ custom-help -h');
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console.log('');
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});
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program.parse(process.argv);
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console.log('stuff');
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```
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Yields the following help output when `node script-name.js -h` or `node script-name.js --help` are run:
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```
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Usage: custom-help [options]
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Options:
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-h, --help output usage information
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-V, --version output the version number
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-f, --foo enable some foo
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-b, --bar enable some bar
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-B, --baz enable some baz
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Examples:
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$ custom-help --help
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$ custom-help -h
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```
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## .outputHelp()
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Output help information without exiting.
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## .help()
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Output help information and exit immediately.
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## Examples
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```js
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var program = require('commander');
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program
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.version('0.0.1')
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.option('-C, --chdir <path>', 'change the working directory')
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.option('-c, --config <path>', 'set config path. defaults to ./deploy.conf')
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.option('-T, --no-tests', 'ignore test hook')
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program
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.command('setup [env]')
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.description('run setup commands for all envs')
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.option("-s, --setup_mode [mode]", "Which setup mode to use")
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.action(function(env, options){
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var mode = options.setup_mode || "normal";
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env = env || 'all';
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console.log('setup for %s env(s) with %s mode', env, mode);
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});
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program
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.command('exec <cmd>')
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.alias('ex')
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.description('execute the given remote cmd')
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.option("-e, --exec_mode <mode>", "Which exec mode to use")
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.action(function(cmd, options){
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console.log('exec "%s" using %s mode', cmd, options.exec_mode);
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}).on('--help', function() {
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console.log(' Examples:');
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console.log();
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console.log(' $ deploy exec sequential');
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console.log(' $ deploy exec async');
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console.log();
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});
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program
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.command('*')
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.action(function(env){
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console.log('deploying "%s"', env);
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});
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program.parse(process.argv);
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```
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You can see more Demos in the [examples](https://github.com/tj/commander.js/tree/master/examples) directory.
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## License
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(The MIT License)
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Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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'Software'), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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