Cumin (Cu)stom (min)ifier for GitHub Pages site constructed by Jekyll. This is a simple minifier for javascript. Still a work in progress

cumin.rb

=begin

author: eric-cc-su

Cumin (Cu)stom (min)ifier

This Ruby script/plugin is meant to minify files that should be minified prior to website deployment.
This plugin will ultimately support simple minification of javascript and css files.

This code is licensed under the MIT License (end of file) and under copyright by Eric Su
=end

require 'fileutils'

module Cumin
	$base = Dir.pwd

	@list = [] # Compilation of all scripts
	comment_open = false
	leadstrip = true
	no_min = false
	trailstrip = true
	dpath = File.join($base, "javascripts")

	if not File.directory?(File.join($base, "js"))
		FileUtils.mkdir_p(File.join($base, "js"))
	end

	Dir.foreach(dpath) {
		|file|
		if file.end_with?(".js") and not file.end_with?(".min.js")
			newfile = file.dup.sub! ".js", ".min.js"
			File.open(File.join($base, "js", newfile), "w+") do |jsminfile|
				File.foreach(File.join($base, "javascripts", file)) do |line|
					line = line.strip

					#Indicates that following code should not be minified
					if line == "/*NOMIN*/"
						no_min = true;
						next
					end

					#Toggle whether spaces in front of special characters are stripped
					if line == "/*LEADSTRIP*/"
						leadstrip ^= 1
					end

					#Toggle whether spaces behind special characters are stripped
					if line == "/*TRAILSTRIP*/"
						trailstrip ^= 1
					end

					#Indicates that following code should be continued to be minified
					if no_min and line != "/*YESMIN*/"
						jsminfile.write(line)
						next
					elsif line == "/*YESMIN*/"
						no_min = false
						next
					end

					if line[0..1] == "//"  # Remove comments
						next

					elsif line.include?("/*")
						comment_open = true
						open_index = line.index("/*")
						if line.include?("*/")
							close_index = line.index("*/")+1
							comment_open = false
						else
							close_index = -1
							line = line.sub! line[open_index..close_index], ""
						end

					elsif line.include?("*/") and comment_open
						comment_open = false
						line = line.sub! line[0..line.index("*/")+1], ""
					end

					# Strip spaces in front of special characters
					if leadstrip
						leading_space = /\s[^A-Za-z0-9"'\s]/.match(line)
						while leading_space != nil
							line = line.sub! leading_space.to_s, leading_space.to_s.strip
							leading_space = /\s[^A-Za-z0-9"'\s]/.match(line)
						end
					end
					
					# Strip spaces following special characters
					if trailstrip
						trailing_space = /[^A-Za-z0-9"'\s]\s/.match(line)
						while trailing_space != nil
							line = line.sub! trailing_space.to_s, trailing_space.to_s.strip
							trailing_space = /[^A-Za-z0-9"'\s]\s/.match(line)
						end
					end

					if comment_open
						next
					end
					jsminfile.write(line)
				end
			end
		end
	}
end

=begin
The MIT License (MIT)

Copyright (c) 2015 Eric Su

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
=end