Buildr uberjar example concatenting spring meta data

gistfile1.rb

assembly_dir = 'target/assembly'
main_class = 'com.something.something.Blah'

artifacts.each do |artifact|
    Unzip.new( _(assembly_dir) => artifact ).extract
    
    # Create a concatenation of all the spring.schemas for each spring jars
    if File.exist?( "#{_(assembly_dir)}/META-INF/spring.schemas" ) 
        new_schema = IO.read("#{_(assembly_dir)}/META-INF/spring.schemas")
        
        File.open( "#{_(assembly_dir)}/META-INF/master_spring.schemas", 'a') do |f|
            f.write( new_schema )
            f.write("\n")
        end
        
        # remove jar's spring.schema
        FileUtils.rm( "#{_(assembly_dir)}/META-INF/spring.schemas" )
    end
    
    # Create a concatenation of all the spring.handlers for each spring jars
    if File.exist?( "#{_(assembly_dir)}/META-INF/spring.handlers" ) 
        new_handler = IO.read("#{_(assembly_dir)}/META-INF/spring.handlers")
        
        master_handler = File.open( "#{_(assembly_dir)}/META-INF/master_spring.handlers", 'a') do |f|
            f.write( new_handler )
            f.write("\n")
        end
        
        # remove jar's spring.handlers
        FileUtils.rm( "#{_(assembly_dir)}/META-INF/spring.handlers" )
    end
    
    # Create a concatenation of all the spring.tooling for each spring jars
    if File.exist?( "#{_(assembly_dir)}/META-INF/spring.tooling" ) 
        new_handler = IO.read("#{_(assembly_dir)}/META-INF/spring.tooling")
        
        master_handler = File.open( "#{_(assembly_dir)}/META-INF/master_spring.tooling", 'a') do |f|
            f.write( new_handler )
            f.write("\n")
        end
        
        # remove jar's spring.handlers
        FileUtils.rm( "#{_(assembly_dir)}/META-INF/spring.tooling" )
    end
end

FileUtils.mv( "#{_(assembly_dir)}/META-INF/master_spring.schemas", "#{_(assembly_dir)}/META-INF/spring.schemas" )
FileUtils.mv( "#{_(assembly_dir)}/META-INF/master_spring.handlers", "#{_(assembly_dir)}/META-INF/spring.handlers" )
FileUtils.mv( "#{_(assembly_dir)}/META-INF/master_spring.tooling", "#{_(assembly_dir)}/META-INF/spring.tooling" )
 
# remove dirs from assembly that should not be in uberjar
FileUtils.rm_rf( "#{_(assembly_dir)}/example/package" )
FileUtils.rm_rf( "#{_(assembly_dir)}/example/dir" )

# create manifest file
File.open( _("#{assembly_dir}/META-INF/MANIFEST.MF"), 'w') do |f| 
    f.write("Implementation-Title: Uberjar Exampleh\n")
    f.write("Implementation-Version: #{project_version}\n") 
    f.write("Main-Class: #{main_class}\n")
    f.write("Created-By: Buildr\n")                 
end

present_dir = Dir.pwd
Dir.chdir _(assembly_dir)
puts "Creating #{_("target/#{project.name}-#{project.version}.jar")}" 
`jar -cfm #{_("target/#{project.name}-#{project.version}.jar")} #{_(assembly_dir)}/META-INF/MANIFEST.MF .`
Dir.chdir present_dir