Quick and dirty minified web service

ReadMe.md

Very quick and dirty modification of Ben Pickles' minify, moving the actual minification to a web service in case you already have a minification workflow in place but don't want to install java on your development virtual machine.

You need Ruby, gems sinatra and closure-compiler (and thus Java) on the machine that hosts the web service.

Start the web service with

ruby app.rb

On the machine that calls the web service, you need to set the environment variable MINIFY_HOST with the host and port of the web service:

export MINIFY_HOST=10.0.0.42:4567

Then

ruby minify.rb foo.js

app.rb

require 'sinatra'

get '/' do
  'Minify'
end

post '/' do
  require 'closure-compiler'

  request.body.rewind  # in case someone already read it
  data = request.body.read
  result = Closure::Compiler.new.compile( data )
end

minify.rb

#!/usr/bin/env ruby

# Very quick and dirty modification of Ben Pickles' minify, moving the actual minification
# to a web service in case you already have a minification workflow in place but don't want
# to install java on your development virtual machine.
# 
# Needs environment variable MINIFY_HOST with host and port:
# 
# export MINIFY_HOST=10.0.0.42:4567
# 
# http://benpickles.com/articles/47-minify-command-line-tool

dry_run = ARGV.delete('--dry-run')
force = ARGV.delete('--force')

if ARGV.empty?
  puts <<-USAGE
  minify, swiftly concat and minify JavaScript files from the command line

  Pass a single argument to create a .min.js version:
    $ minify jquery.myplugin.js

  Pass one or more files to concat and minify them - the last argument is
  always the output file:
    $ minify input.js output.js
    $ minify a.js few.js files.js output.min.js

  If the output file already exists you can overwrite it by using the --force.

  If you're not sure use --dry-run to see what'll happen.
USAGE
  exit
end

input, output = ARGV.length == 1 ?
  [ARGV, ARGV.first.sub(/\.js$/, '.min.js')] :
  [ARGV[0..-2], ARGV.last]

if (missing = input.select { |path| !File.exists?(path) }).any?
  puts "Some input files do not exist:\n  #{missing.join("  \n")}"
  exit 1
end

if File.exists?(output) && !force
  puts "Output file #{output} already exists, use the --force to overwrite"
  exit 1
end

if dry_run
  puts "#{input.inspect} => #{output}"
else
  require 'net/http'

  host, port = ENV['MINIFY_HOST'].split(':')

  request = Net::HTTP::Post.new( '/', initheader = { 'Content-Type' => 'text/javascript; charset=utf-8' } )
  request.body = input.map { |file| File.read(file) }.join("\n")
  response = Net::HTTP.new( host, port ).start { |http| http.request( request ) }

  File.open(output, 'w') do |f|
    f.write response.body
  end
end