commit-components.js

var spawn = require( "child_process" ).spawn;

var path = "/Users/scottgonzalez/Projects/jquery-release";
var committish = "master";

function getLog( callback ) {
	var stdout = "";
	var stderr = "";
	var child = spawn( "git", [ "log", "--format=%s", committish ], { cwd: path } );
	var hadError = false;
	child.on( "error", function( error ) {
		hadError = true;
		callback( error );
	});
	child.stdout.on( "data", function( data ) {
		stdout += data;
	});
	child.stderr.on( "data", function( data ) {
		stderr += data;
	});
	child.on( "close", function( code ) {
		if ( hadError ) {
			return;
		}

		var error;
		if ( code ) {
			error = new Error( stderr );
			error.code = code;
			return callback( error );
		}

		callback( null, stdout.trimRight().split( "\n" ) );
	});
}

getLog(function( error, log ) {
	if ( error ) {
		throw error;
	}

	var components = {};
	log.forEach(function( line ) {
		var parts = line.match( /^([^:])+:/ );
		var component = parts ? parts[ 0 ] : null;

		if ( !component ) {
			return;
		}

		if ( !components.hasOwnProperty( component ) ) {
			components[ component ] = 0;
		}

		components[ component ]++;
	});

	Object.keys( components )
		.sort(function( a, b ) {
			return components[ b ] > components[ a ] ? 1 : -1;
		})
		.forEach(function( component ) {
			console.log( component, components[ component ] );
		});
});