Commander-Parser.js

A command-line parser for node.js like python's argparser, inspired by commander.js.

Command

var command = parser().command(<command>, <help>)

Argument

parser().argument(<name>, <help>, {
    "narg": <narg> ,
    "required": <boolean>,
    "dest": <dest>,
    "const": <conse>,
    "type": <type>
})

Option

parser().option(<flag>, <help>, {
    "action": <action> ,
    "required": <boolean>,
    "dest": <dest>,
    "const": <conse>,
    "type": <type>
})

Command

parser().command(<name>, <help>);

Methods

parser(name)

Return an instance of parser.Parser.

• name: The name of the program(default: process.argv[1])

class parser.Parser(name)

Create a new Parser object.

• name: The name of the program(default: process.argv[1])

action(name, handler, needInput)

• name: The name of the Action.

• handler: The handler of the Action.

  arguments: handler arguments.

  • value: raw value.
  • memo: dest memo.
  • options: options.

type(name, handler)

• name: The name of the Type.

• handler: The handler of the Type.

  arguments: handler arguments.

  • value: raw value.
  • error: error handler.
  • options: options.

Parser() Methods

usage(usage)

Return parser.

• usage: The string describing the program usage(default: generated from arguments added to parser)

description(description)

Return parser.

• description: The string describing the program.

addition(addition)

Return parser.

• addition: Additional messages of the program.

argument(name, help, options={})

Return parser.

• name: The name of the argument.
• help: The string describing the argument.
• options: Other options.
  • narg: How many arguments of type type should be consumed when this option is seen. If > 1, parser will store a array of values to dest.(default: 1)
  • required: The value is required.
  • default: The value to use for this argument’s destination if the argument is not seen on the command line.
  • dest: This tells parser where to write it.
  • type: The argument type expected (e.g., "string" or "int"); the available types are ["int", "float", "string", "choice", <function>].You can registry custom types by parser.type.
  • choices: For options of type "choice", the list of strings the user may choose from.

option(flag, help, options={})

Return parser.

• flag: The flags of the option.
• help: The string describing the option.
• options: Other options.
  • action: Determines parser‘s behaviour when this option is seen on the command line; the available options are ["store", "store_const", "store_true", "store_false", "append", "append_const", "count"].(default "store") You can registry custom actions by parser.action.
  • required: The value is required.
  • default: The value to use for this argument’s destination if the argument is not seen on the command line.
  • dest: This tells parser where to write it.
  • type: The argument type expected (e.g., "string" or "int"); the available types are ["int", "float", "string", "choice", <function>].You can registry custom types by parser.type.
  • const: For actions that store a constant value, the constant value to store.
  • choices: For options of type "choice", the list of strings the user may choose from.

command(name, help)

Return command parser.

• name: The name of the command.
• help: The string describing the command.

help()

Print parser's usage.

exec(function)

Return parser.

• function: This function will be called when calling parser.parse.

• arguments:

  • options: The parsed command-line options.

parse(argv, withCommand=false)

parse command-line options

• argv: command-line argvs with ["node", <script>].(default: process.argv)

• withCommand: If this is a string.Parsed options'key "command" will be command name.

parseArgv(argv, withCommand=false)

like parse, but argv without ["node", <script>]

action(name, handler, needInput)

• name: The name of the Action.

• handler: The handler of the Action.

  arguments: handler arguments.

  • value: raw value.
  • memo: dest memo.
  • options: options.

type(name, handler)

• name: The name of the Type.

• handler: The handler of the Type.

  arguments: handler arguments.

  • value: raw value.
  • error: error handler.
  • options: options.

Examples

var parser = require("commander-parser");

parser()
    .option(['-f', '--file'], 'write file names', {
        'action': 'store_append',
        'required': true
    })
    .option('-a', 'append file', {
        'dest': 'mode',
        'action': 'store_const',
        'const': 'a'
    })
    .option('-w', 'write file', {
        'dest': 'mode',
        'action': 'store_const',
        'const': 'w'
    });