cli-params

cli-params is a simple module that helps your CLI tool parse command line arguments and build parameters format to test if cmd is valid

Installation

npm i cli-params

Usage

cli-params works on both regular package and globally installed one.

Simple Method

Dead simple, use it on the fly.

# node
node index.js --p1 --p2 hello
# global
your-cli-tool --p1 --p2 hello

import CLIParams from 'cli-params';

new CLIParams().exec((err, params) => {
    if (err) return console.log(err);
    console.log(params);
});

{ "p1": true, "p2": "hello" }

Prebuilt Format

Use add method to add format(s).

node index.js -d -i --id scrwdrv --bonus 12.0

const cliParams = new CLIParams();

cliParams.add({
    params: [
        {
            param: 'debug',
            type: 'boolean', // true or false, no given value will be treated as `true`
            optional: true, // boolean is optional by default, no param means `false`
            alias: 'd'
        },
        {
            param: 'interval',
            type: 'int', // no floating point is allowed,
            default: 50, // default value when value is not given
            alias: 'i'
        },
        {
            param: 'id',
            type: 'string'
        },
        {
            param: 'bonus',
            type: 'float', // allow both int and float
            optional: false // which is default
        }
    ]
}, (err) => {
    if (err) return console.log(err);
    cliParams.exec((err, params) => {
        if (err) return console.log(err);
        console.log(params);
    });
});

{ "debug": true, "interval": 50, "id": "scrwdrv", "bonus": 12 }

Types for Param

• int
• float
• string
• boolean
• array-of-int (not available for Target)
• array-of-float (not available for Target)
• array-of-string (not available for Target)
• array-of-boolean (not available for Target)

Mutiple Formats

You can pass formats in an array, by array index order, formats will be used to parse given parameters and callback the first successfully parsed one.

node index.js -h

cliParams.add([
    {
        params: [
            {
                param: 'input',
                type: 'string',
                alias: 'i'
            },
            {
                param: 'password',
                type: 'string',
                optional: true,
                alias: 'p'
            }
        ],
        id: 'regular' // id is not optional when multiple formats are submitted
    },
    {
        params: {
            param: 'help',
            type: 'boolean',
            alias: 'h'
        },
        id: 'help' // id is not optional when multiple formats are submitted
    },
    {
        params: {
            param: 'version',
            type: 'boolean',
            alias: 'v'
        },
        id: 'version' // id is not optional when multiple formats are submitted
    }
]).exec((err, params, id) => {
    if (err) return console.log(err);
    console.log(id);
    // output: help
    console.log(params);
});

{ "help": true }

Trailing Param (Target)

Parameter with no name and located at the end of command line will be treated as Target. Every cmd can only have one target and need to be named beforehand.

node index.js -r 50 https://google.com

cliParams.add({
    params:
    {
        param: 'rate',
        type: 'int',
        alias: 'r'
    },
    target: {
        param: 'url',
        type: 'string',
        optional: false // which is default
    }
}, (err) => {
    if (err) return console.log(err);
    cliParams.exec((err, params) => {
        if (err) return console.log(err);
        console.log(params);
    });
});

{ "url": "https://google.com", "rate": 50 }

Array of ...

Passing multiple values with space as separator to a single parameter.

node index.js -i 1 2 3 4 5 -s google yahoo myTarget 

new CLIParams().add({
    params: [
        {
            param: 'intArr',
            type: 'array-of-int',
            alias: 'i'
        }, {
            param: 'stringArr',
            type: 'array-of-string',
            alias: 's'
        }
    ],
    target: {
        param: 'target',
        type: 'string'
    }
}).exec(async (err, params) => {
    if (err) return console.log(err);
    console.log(params);
});

{ "target": "myTarget", "intArr": [ 1, 2, 3, 4, 5 ], "stringArr": [ "google", "yahoo" ] }