little nagging git hook to remind me to jshint my changes

pre-commit

#!/usr/bin/env node
//install this script from the root of the local repo with something like...
//mkdir -p .git/hooks ; curl -L https://gist.github.com/dtudury/6629720/raw > .git/hooks/pre-commit ; chmod +x .git/hooks/pre-commit


var EXEC = require('child_process').exec;
var JSHINT = require('jshint').JSHINT;
var FS = require('fs');


EXEC('git status --porcelain', function (error, stdout, stderr) {
    if(error) {
        console.log('stderr:', stderr);
        process.exit(1);
    }
    var filenames = stdout.split(/\r?\n/);
    filenames = filenames.map(function(line) {
        var parts = line.split(/\s+/);
        return parts.length && /[AM]/.test(parts[0]) && /\.JS$/i.test(parts[1]) && parts[1]; //if it's good, use it
    });
    filenames = filenames.filter(function(filename) {
        return filename; //remove falsey entries
    });
    filenames.forEach(function(filename) {
        if(!JSHINT(FS.readFileSync(filename).toString())) {
            EXEC('jshint ' + filenames.join(' '), function (error, stdout, stderr) {
                //we're expecting an error but it writes to stdout
                console.log(stderr);
                console.log(stdout);
                console.error("[SHAME] jshint fails");
                console.error("[SHAME] run 'jshint' from root of project");
                console.error("[SHAME] something like: 'jshint " + filenames.join(' ') + "'");
                console.error("[SHAME] to ignore this say --no-verify");
                console.error("[SHAME] COMMIT FAILED! NO COMMIT FOR YOU!!!1!");
                process.exit(1);
            });
        }
    });
});