module Buildr
  module Generate #:nodoc:

    task "generate" do
      script = Generate.from_directory(true).join("\n")
      buildfile = File.expand_path("buildfile")
      File.open(buildfile, "w") { |file| file.write script }
      puts "Created #{buildfile}"
    end

    class << self

      def from_directory(root = false)
        name = File.basename(Dir.pwd)
        if root
          header = <<-EOF
# Generated by Buildr #{Buildr::VERSION}, change to your liking

# Version number for this release
VERSION_NUMBER = "1.0.0"
# Version number for the next release
NEXT_VERSION = "1.0.1"
# Group identifier for your projects
GROUP = "#{name}"
COPYRIGHT = ""

# Specify Maven 2.0 remote repositories here, like this:
repositories.remote << "http://www.ibiblio.org/maven2/"

desc "The #{name.capitalize} project"
define "#{name}" do

  project.version = VERSION_NUMBER
  project.group = GROUP
  manifest["Implementation-Vendor"] = COPYRIGHT
EOF
          script = header.split("\n")
        else
          script = [ %{define "#{name}" do} ]
        end
        script <<  "  compile.with # Add classpath dependencies" if File.exist?("src/main/java")
        script <<  "  resources" if File.exist?("src/main/resources")
        script <<  "  test.compile.with # Add classpath dependencies" if File.exist?("src/test/java")
        script <<  "  test.resources" if File.exist?("src/test/resources")
        if File.exist?("src/main/webapp")
          script <<  "  package(:war)"
        elsif File.exist?("src/main/java")
          script <<  "  package(:jar)"
        end
        dirs = FileList["*"].exclude("src", "target", "report").
          select { |file| File.directory?(file) && File.exist?(File.join(file, "src")) }
        unless dirs.empty?
          script << ""
          dirs.sort.each do |dir|
            Dir.chdir(dir) { script << from_directory.flatten.map { |line| "  " + line } << "" }
          end
        end
        script << "end"
        script.flatten
      end

    end

  end
end