Bleeding edge jruby-complete installer for ruby-processing

Rakefile

require 'rake/clean'

#JRUBY_VERSION      = "1.7.8"
JRUBY_VERSION      = "9000.dev"

CLOBBER.include("jruby-complete-#{JRUBY_VERSION}.jar")

desc "download, and copy to ruby-processing"
task :default => [:download, :copy_ruby]

desc "download JRuby upstream sources"
task :download => ["jruby-complete-#{JRUBY_VERSION}.jar"]

file "jruby-complete-#{JRUBY_VERSION}.jar" do
  sh "wget http://ci.jruby.org/snapshots/master/jruby-complete-#{JRUBY_VERSION}.jar"
  sh "wget http://ci.jruby.org/snapshots/master/jruby-complete-#{JRUBY_VERSION}.jar.sha1"
  sha1 = File.read("jruby-complete-#{JRUBY_VERSION}.jar.sha1").chomp
  check_sha1("jruby-complete-#{JRUBY_VERSION}.jar", sha1)
end

directory "../lib/ruby"

desc "copy jruby-complete"
task :copy_ruby => ["../lib/ruby"] do
  sh "cp -v jruby-complete-#{JRUBY_VERSION}.jar ../lib/ruby/jruby-complete.jar"
end

def check_sha1(filename, expected_hash)
  require "digest/sha1"
  sha1 = Digest::SHA1.new
  File.open(filename, "r") do |f|
    while buf = f.read(4096)
      sha1.update(buf)
    end
  end
  if sha1.hexdigest != expected_hash
    raise "bad sha1 checksum for #{filename} (expected #{expected_hash} got #{sha1.hexdigest})"
  end
end