Small PHP script to build a web application from a set of source files, combine it into as few files as possible (as defined by you), and minify/compress everything using a few useful tools. This particular script requires that you have PHP, Ruby, and Java installed, as well as the SASS gem, and you also need the YUICompressor and HTMLCompressor…

build-site.php

<?php
  
  //You can pass -nm into the php script and no minification will occure (for debug purposes)
  $minify = true;
  foreach($argv as $arg)
  {
    if( $arg == "-nm" )
    {
      $minify = false;
    }
  }

  echo "Compressing javascript files...\n";
  //This combines example-1.js and example-2.js into 1 file and minifies it
  compress_resources( "..\\output\\js\\final.js", "js", array(
    "..\\js\\example-1.js",
    "..\\js\\example-2.js"
  );

	echo "Compressing stylesheet files...\n";
  //This runs both example-1.scss and example-2.scss through SASS, and then combines and minifies them
	compress_resources( "..\\output\\css\\final.css", "css", array(
		"..\\css\\example-1.scss",
    "..\\css\\example-2.scss"
	));

	echo "Compressing markup files...\n";
  //This combines example-1.html and example-2.html into 1 file and minifies it
  //You wouldn't normally combine HTML files unless you're using them to hold
  //templates, like the ones you'd use with Underscore templates or some other
  //JavaScript template library.
	compress_resources( "..\\output\\final.html", "html", array(
		"..\\html\\example-1.html",
    "..\\html\\example-2.html"
	));

  //You can run any of those on single files if you just want to minify/compress
  //them instead of combining them.  The processing function is below so you
  //can poke around in it and see what's happening.

	echo "All files successfully compressed...\n";




	/*******************************************************************
	 *******************************************************************
	 *******************************************************************
	 * 
	 * Utility functions that handle compression and minification.
	 *
	 * Shouldn't need to modify anything beyond this point.
	 * 
	 *******************************************************************
	 *******************************************************************
	 *******************************************************************/

	/*
	 * Process stylesheets using SASS.
	 */
	function process_stylesheet($file, $output)
	{
		exec( "sass " . $file . " " . $output );
	}

	/*
	 * Compress a given set of files according to their types, which
	 * means minifying them, combining them all into one file, and
	 * copying that file to the specified output file.
	 */
	function compress_resources($output, $type, $files)
	{
		global $minify;
		$string = "";
		foreach( $files as $file )
		{
			$delete = false;
			if( $type == "css" && substr( $file, -4 ) == "scss" )
			{
				echo "Converting SASS stylesheet: " . $file . "...\n";
				$converted = substr( $file, 0, strlen($file) - 4 ) . "css";
				exec( "sass " . $file . " " . $converted );
				if( file_exists( $converted ) )
				{
					$file = $converted;
					$delete = true;
				}
			}
			echo "Processing resource: " . $file . "...\n";
			if( substr($file, 0 - strlen($type) - 4, strlen($type) + 4) == "min.$type" || !$minify )
			{
				$fp = fopen($file, "r");
				if( $fp )
				{
					$body = fread($fp, filesize($file));
					fclose($fp);
					if( strlen($string) > 0 )
					{
						$string .= "\r\n";
					}
					$string .= $body;
				}
			}
			else
			{
				if( $type == "css" || $type == "js" )
				{
					exec( "java -jar yuicompressor-2.4.8pre.jar -o tempfile.$type " . $file );
				}
				else if( $type == "html" )
				{
					exec( "java -jar htmlcompressor-1.5.3.jar -o tempfile.$type " . $file );
				}
				if( file_exists("tempfile.$type") )
				{
					$fp = fopen("tempfile.$type", "r");
					if( $fp )
					{
						$body = fread($fp, filesize("tempfile.$type"));
						fclose($fp);
						unlink("tempfile.$type");
						if( strlen($string) > 0 )
						{
							$string .= "\r\n";
						}
						$string .= $body;
					}
				}
			}
			if( $delete )
			{
				unlink($file);
			}
		}

		if( $minify )
		{
			process_string($string);
		}
		$fp = fopen($output, "w");
		if($fp)
		{
			fwrite($fp, $string, strlen($string));
			fclose($fp);
		}
	}

	/*
	 * Remove comments and unnecessary white space from a string
	 */
	function process_string(&$string)
	{
		$string = preg_replace( "!^\\s*//(.*?)\$!sim", "", $string );
		$string = preg_replace( "/\\/\\*(.*?)\\*\\//si", "", $string );
		$string = preg_replace( "/\n/si", "", $string );
		$string = preg_replace( "/\r/si", "", $string );
		$string = preg_replace( "/\r\n/si", "", $string );
	}

?>