A Merging tool for HTML files that requires all CSS / JS from external sources to be inlined in specific areas of a document.

MacroMerge.hx

package;
import haxe.io.Path;
import haxe.Json;
import sys.FileSystem;
import sys.io.File;

/**
 * @author: Pierre Chamberlain
 * @version: 1.0
 * 
 * Arguments:
 *
 * - The arguments are INPUT and OUTPUT filepaths to the HTML documents.
 *  (1st = template, 2nd = output).
 *
 * HTML Template File Usage:
 * 
 * - Type a multiline comment with a list of files to lookup, like so:
 * 		@MacroMerge: inlined/reset.css, inlined/main.css
 * 		@MacroMerge: public/vendor.js, public/app.js
 * 
 * Brunch Usage:
 * 
 * - To run this macro as a post-build process, you will need "after-brunch".
 *   You can find the NPM install instructions here:
 * 
 * - Then you can set your brunch config file like so:
 * 
 *		afterBrunch: [
 *			"haxe -cp . --macro MacroMerge.html('inlined/index.html','public/index.html')"
 *		]
 * 
 */
class MacroMerge {
	//This is the main method called from the CMD line (or Brunch.io, etc.)
	static function html(input:String, output:String) {
		trace(input + " : "  + FileSystem.exists(input));
		
		var content = File.getContent(input);
		var lines = content.split("\n");
		
		var results:Array<String> = [];
		
		for (line in lines) {
			if (line.indexOf("@MacroMerge:")>-1) {
				inspectLine(results, line);
				continue;
			}
			results.push( line );
		}
		
		var outputAbs = FileSystem.absolutePath(output);
		File.saveContent(outputAbs, results.join("\n") );
		trace("Files merged to HTML file: " + output);
	}
	
	static function inspectLine(results:Array<String>, line:String) {
		line = StringTools.trim(line);
		line = StringTools.replace(line, "*/", "");
		line = StringTools.replace(line, "-->", "");
		var files = line.split(":")[1].split(",");
		var merged:Array<String> = [];
		for (file in files) {
			file = StringTools.trim(file);
			var subContent = File.getContent(file);
			merged.push( subContent );
		}
		results.push( merged.join("\n") );
	}
}

Note: This also works great with Brunch.io's UglifyJS plugin to squeeze down the filesize of the final HTML file even further.