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Rapidly build command line apps
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Latest commit 150c164 @chriso 0.11.1

README.md

cli is a toolkit for rapidly building command line apps - it includes:

  • Full featured opts/args parser
  • Plugin support for adding common options and switches
  • Helper methods for working with input/output and spawning child processes
  • Output colored/styled messages, progress bars or spinners
  • Command auto-completion and glob support

Install using npm install cli or just bundle cli.js with your app.

Example apps

sort.js

#!/usr/bin/env node
require('cli').withStdinLines(function(lines, newline) {
    this.output(lines.sort().join(newline));
});

Try it out

$ ./sort.js < input.txt

Let's add support for an -n switch to use a numeric sort, and a -r switch to reverse output - only 5 extra lines of code (!)

var cli = require('cli'), options = cli.parse();

cli.withStdinLines(function(lines, newline) {
    lines.sort(!options.n ? null : function(a, b) {
        return parseInt(a) > parseInt(b);
    });
    if (options.r) lines.reverse();
    this.output(lines.join(newline));
});

static.js

Let's create a static file server with daemon support to see the opts parser + plugins in use - note: this requires npm install creationix daemon

var cli = require('cli').enable('daemon', 'status'); //Enable 2 plugins

cli.parse({
    log:   ['l', 'Enable logging'],
    port:  ['p', 'Listen on this port', 'number', 8080],
    serve: [false, 'Serve static files from PATH', 'path', './public']
});

cli.main(function(args, options) {
    var server, middleware = [];

    if (options.log) {
        this.debug('Enabling logging');
        middleware.push(require('creationix/log')());
    }

    this.debug('Serving files from ' + options.serve);
    middleware.push(require('creationix/static')('/', options.serve, 'index.html'));

    server = this.createServer(middleware).listen(options.port);

    this.ok('Listening on port ' + options.port);
});

To output usage information

$ ./static.js --help

To create a daemon that serves files from /tmp, run

$ ./static.js -ld --serve=/tmp

For more examples, see ./examples

Command Line Arguments Parser

cli takes an object as a map for the arguments you wish to parse.
Each property/key in the object is the long version of the argument i.e. --file
The array associated with it is the options to apply to that argument.

Example

cli.parse({
    file: [ 'f', 'A file to process', 'file', temp.log ],          // -f, --file FILE   A file to process
    time: [ 't', 'An access time', 'time', false],                 // -t, --time TIME   An access time
    work: [ false, 'What kind of work to do', 'string', 'sleep' ]  //     --work STRING What kind of work to do
});

Explanation of array options

  1. A short name, single letter i.e. -f, or false if no short name is supported for this option
  2. A description of the option
  3. The type of object the argument should map too.
    Below is a list of the return types followed by a description and a list of
    valid values you can use for this option to get desired type of Object back.
    • as-is: What you enter, is what you get
      • 'string', 1, true
    • int: Is converted to an Integer wrapped in a Number Object
      • 'int', 'number', 'num',
      • 'time', 'seconds', 'secs', 'minutes', 'mins'
      • 'x', 'n'
    • date: Is converted to a Date Object
      • 'date', 'datetime', 'date_time'
    • float: Is converted to a Float wrapped in a Number Object
      • 'float', 'decimal'
    • file: Is converted to a String Object if it is a valid path
      • 'path', 'file', 'directory', 'dir'
    • email: Converted to a String Object if it is a valid email format
      • 'email'
    • url: Converted to a String Object if it is a valid URL format
      • 'url', 'uri', 'domain', 'host'
    • ip: Converted to a String Object if it is a valid IP Address format
      • 'ip'
    • true: Converted to true if argument is present on command line
      • 'bool', 'boolean', 'on'
    • false: Converted to false if argument is present on command line
      • 'false', 'off', false, 0
  4. A default value for this option if one is not given on the command line

Helper methods

cli has methods that collect stdin (newline is auto-detected as \n or \r\n)

cli.withStdin(callback);        //callback receives stdin as a string
cli.withStdinLines(callback);   //callback receives stdin split into an array of lines (lines, newline)

cli also has a lower level method for working with input line by line (see ./examples/cat.js for an example).

cli.withInput(file, function (line, newline, eof) {
    if (!eof) {
        this.output(line + newline);
    }
});

Note: file can be omitted if you want to work with stdin

//cli.toType(object);         If a Built-in type, returns the name of the type as a lower cased String
cli.toType([]);               // 'array'
cli.toType(new Date());       // 'date'
cli.toType(1);                // 'integer'
cli.toType(1.1);              // 'float'
cli.toType(Math);             // 'math'
cli.toType(/a/);              // 'regex'
cli.toType(JSON);             // 'json'

To output a progress bar, call

cli.progress(progress); //Where 0 <= progress <= 1

To spawn a child process, use

cli.exec(cmd, callback); //callback receives the output of the process (split into lines)

cli also comes bundled with kof's node-natives (access with cli.native) and creationix' stack (access with cli.createServer)

Plugins

Plugins are a way of adding common opts and can be enabled using

cli.enable(plugin1, [plugin2, ...]);  //To disable, use the equivalent disable() method

help - enabled by default

Adds -h,--help to output auto-generated usage information

version

Adds -v,--version to output version information for the app. cli will attempt to locate and parse a nearby package.json

To set your own app name and version, use cli.setApp(app_name, version)

status

Adds options to show/hide the stylized status messages that are output to the console when using one of these methods

cli.debug(msg);  //Only shown when using --debug
cli.error(msg);
cli.fatal(msg);  //Exits the process after outputting msg
cli.info(msg);
cli.ok(msg);

-k,--no-color will omit ANSI color escapes from the output

glob - requires npm install glob

Enables glob matching of arguments

daemon - requires npm install daemon

Adds -d,--daemon ARG for daemonizing the process and controlling the resulting daemon

ARG can be either start (default), stop, restart, pid (outputs the daemon's pid if it's running), or log (output the daemon's stdout+stderr)

timeout

Adds -t,--timeout N to exit the process after N seconds with an error

catchall

Adds -c,--catch to catch and output uncaughtExceptions and resume execution

Note: Plugins are automatically disabled if an option or switch of the same name is already defined

LICENSE

(MIT license)

Copyright (c) 2010 Chris O'Hara cohara87@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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