JarCastingcli 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));
});
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
- A short name, single letter i.e. -f, or false if no short name is supported for this option
- A description of the option
- 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
- 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
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 [email protected]
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.