Rakefile

#!/usr/bin/env rake
require "bundler/gem_tasks"
require 'fileutils'
require 'pathname'

ROOT_PATH = Pathname.new(File.expand_path("../../", __FILE__))
RUBYGEM_PATH = Pathname.new(File.expand_path("../", __FILE__))

task build: [:import_externals, :version, :manifest]
task default: :build

task :import_externals do
  puts "building rubygem"

  Rake::Task[:clean].invoke

  FileUtils.rm_r(RUBYGEM_PATH + "man") rescue nil
  FileUtils.rm_r(RUBYGEM_PATH + "build") rescue nil

  # manpages
  FileUtils.mkdir(RUBYGEM_PATH + "man")
  FileUtils.cp_r(ROOT_PATH + "man/build", RUBYGEM_PATH + "man")

  # multi-arch binaries
  FileUtils.cp_r(ROOT_PATH + "build", RUBYGEM_PATH + "build")

  Rake::Task[:manifest].invoke
  Rake::Task[:build].invoke
end

task :version do
  version = File.read('../VERSION').chomp
  File.open('lib/zeus/version.rb', 'w') { |f| f.puts <<END
module Zeus
  VERSION = "#{version}"
end
END
  }
end

task manifest: :version do
  files = `find . -type f | sed 's|^\./||'`.lines.map(&:chomp)
  exceptions = [
    /.gitignore$/,
    /^MANIFEST$/,
    /^pkg\//,
  ]
  files.reject! { |f| exceptions.any? {|ex| f =~ ex }}
  File.open('MANIFEST', 'w') {|f| f.puts files.join("\n") }
end

task :clean do
  FileUtils.rm(RUBYGEM_PATH + "lib/zeus/version.rb") rescue nil
  FileUtils.rm_r(RUBYGEM_PATH + "man") rescue nil
  FileUtils.rm_r(RUBYGEM_PATH + "build") rescue nil
  FileUtils.rm_r(RUBYGEM_PATH + "pkg") rescue nil
end