shell script to invoke jslint via jsc on Mac OS X

README.markdown

I just realized that there is a rather well hidden javascript interpreter in the mac os x terminal out of the box. /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc See http://www.phpied.com/javascript-shell-scripting/

Then i figured it coud be quite easy to set up a command line util to run jslint from anywhere. Thought i´d share how.

Setup

• Download and unzip this gist.
• Download Douglas Crockfords jslint from here https://github.com/douglascrockford/JSLint/raw/master/fulljslint.js.
• Edit the 'jslint' shell script and set the paths to where you saved the .js files.
• Chmod the 'jslint' shell script (chmod +x )
• (optional) add an alias to your .bashrc : alias jslint <path-to-files>/jslint
• Try it!

Invocation

Examples of valid invocations jslint filename.js , jslint filename1.js filename2.js , jslint folder/*.js folder2/*.js ,

jsc_jslint_wrapper.js

/*
This script is just a wrapper around Douglas Crockfords jslint, intended to be invoked by jsc.
The script is depending on jslint, which means jslint has to be loaded before this script.
*/
/*global JSLINT, print, quit, arguments */	
(function (source) {
	if (typeof JSLINT === 'undefined') {
		print('ERROR: JSLINT does not appear to be properly loaded.');
	}
	
	if (typeof JSLINT === 'undefined' || !source) {
		print('usage:\n $ jsc jslint.js jsc_jslint.js -- "`cat source.js`"');
		quit();
	} 
	var 
		// Options from www.jslint.com when using "The good parts" 
		goodPartsOptions = {devel: true,
							browser: true,
							white: true,
							onevar: true,
							undef: true,
							newcap: true,
							nomen: true,
							regexp: true,
							plusplus: true,
							bitwise: true,
							maxerr: 50,
							indent: 4 },					
	    result = JSLINT(source, goodPartsOptions),
	    errors = [],
	    error = {},
	    i;
	
	if (result) {
		print('\tNo errors :-)');
	} else {
		print('ERRORS:');
		errors = JSLINT.data().errors;
		for (i = 0; i < errors.length; i += 1) {
			error = errors[i];
			print(' ' + error.line + ':' + error.character + '\t' + error.reason);
			print('\t' + error.evidence.trim());
			print(' ---');
		}
		print('Total ' + errors.length + ' errors');
	}
	quit();
}(arguments[0]));

jslint

#!/bin/sh

#Dependencies
#Set paths appropriately to the 'core' jslint javascript file and to the jslinter wrapper script
JSLINT=<path-to-file>/fulljslint.js
JSC_WRAPPER=<path-to-file>/jsc_jslint_wrapper.js

if [ $# = "0" ]
then 
	echo 'Usage: \njslint file(s)'
	echo 'Examples:'
	echo 'jslint file.js file2.js'
	echo 'jslint folder/*.js folder2/*.js'
	
else
	#Loop over arguments, invoking jslint for each file separetely
	for sourcefile in "$@"
	do
		echo "\n=== $sourcefile ==="
		
		#Check that file exists
		if [ ! -r $sourcefile -o ! -s $sourcefile ]
		then
			echo "FIle is not readable or empty"
			continue
		fi

		#Invoke jslint via jsc
		/System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc  $JSLINT $JSC_WRAPPER -- "=`cat $sourcefile`"
		
		echo "==="		
	done
fi

The path and filename for Crockford's JS Lint has changed.

Also the shell script kept failing on my system (Lion) b/c of the equals sign on line 29. Seems to work after removing it.

Thanks to sym3tri for posting about that bug. I've posted a fork of the original gist that includes that fix and a bit of cleanup on the help output.

https://gist.github.com/2064959

Too bad we can't do pull requests on gists. :-(