#rake tasks for freezing/unfreezing javascript libraries
#Written by Brian Samson
#http://briansamson.com/b/?p=80

SVN_URL = "http://your.svn/repository"
LIBRARY_NAME = "jslib"
LOCAL_PATH = "public/javascripts"

namespace LIBRARY_NAME.to_sym do
   require 'rexml/document'
   desc "Freeze the current #{LIBRARY_NAME} library"
   task :freeze do
      puts "Freezing #{LIBRARY_NAME}..."
      cmd = "svn info #{LOCAL_PATH}/#{LIBRARY_NAME} --xml"
      info = REXML::Document.new(`#{cmd}`)
      revision = info.elements['info/entry'].attributes['revision']
      cmd = "svn propget svn:externals #{LOCAL_PATH}"
      props = `#{cmd}`
      newprops = ""
      props.split(/\n/).each do |line|
        next if line[0..4] == LIBRARY_NAME
        newprops << line
        newprops << "\n"
      end
      newprops << "sfrjs -r #{revision} #{SVN_URL}"
      cmd = "svn propset svn:externals \"#{newprops}\" #{LOCAL_PATH}"
      puts "Freezing #{LIBRARY_NAME} to revision #{revision}"
      system(cmd)

      puts "#{LIBRARY_NAME} is frozen to r#{revision}.  You need to commit to make this permanent"
   end

   desc "Unfreeze the current #{LIBRARY_NAME} library"
   task :unfreeze do
      cmd = "svn info #{LOCAL_PATH}/#{LIBRARY_NAME} --xml"
      puts  "Unfreezing SFRJS..."
      info = REXML::Document.new(`#{cmd}`)
      url = info.elements['info/entry/url'].text
      cmd = "svn propget svn:externals #{LOCAL_PATH}"
      puts "Getting properties..."
      props = `#{cmd}`
      newprops = ""
      props.split(/\n/).each do |line|
        next if line[0..4] == LIBRARY_NAME
        newprops << line
        newprops << "\n"
      end
      newprops << "sfrjs #{url}"
      cmd = "svn propset svn:externals \"#{newprops}\" #{LOCAL_PATH}"
      puts "Unfreezing sfrjs..."
      system(cmd)

      puts "Updating...."
      cmd = "svn update #{LOCAL_PATH}/#{LIBRARY_NAME}"
      system(cmd)

      puts "Done.  #{LIBRARY_NAME} is unfrozen, but you still need to commit to unfreeze it permanently"
   end

   task :check do
      cmd = "svn propget svn:externals #{LOCAL_PATH}"
      puts cmd
      puts `#{cmd}`
   end

   task :install do
      unless (File.exists?("#{LOCAL_PATH}/#{LIBRARY_NAME}"))
         cmd = "svn propset svn:externals \"#{LIBRARY_NAME} #{SVN_URL}\" #{LOCAL_PATH}"
         puts "Adding Externals on #{LIBRARY_NAME}..."
         system(cmd)

         puts "Updating...."
         cmd = "svn update #{LOCAL_PATH}"
         system(cmd)
      else
         puts "#{LIBRARY_NAME} is already installed"
      end
   end

end