require 'rbconfig'
require 'rake/testtask'
task :default => [:setup, :test]

# set GEM_HOME to use local ./vendor dir for tests
vendor_dir = './vendor'
ruby_version = RbConfig::CONFIG['ruby_version']
ruby_engine = (defined?(RUBY_ENGINE) && RUBY_ENGINE) || 'ruby'
gem_home = ENV['GEM_HOME'] = "#{vendor_dir}/#{ruby_engine}/#{ruby_version}"

# Write the current version.
task :version do
  puts "#{ruby_engine} #{RUBY_VERSION} (#{gem_home})"
end

desc "Install gems to #{ENV['GEM_HOME']}"
task :setup do
  verbose false do
    sh "
      bundle check >/dev/null || {
        echo 'Updating #{gem_home}' &&
        bundle install --path='#{vendor_dir}'; }
    "
  end
end

# SPECS =====================================================================

desc 'Generate test coverage report'
task :rcov do
  sh "rcov -Ilib:test test/*_test.rb"
end

desc 'Run tests (default)'
Rake::TestTask.new(:test) do |t|
  t.test_files = FileList['test/*_test.rb']
  t.ruby_opts = ['-Itest']
  t.ruby_opts << '-rubygems' if defined? Gem
end
task :test => :version

# PACKAGING =================================================================

begin
  require 'rubygems'
rescue LoadError
end

if defined?(Gem)
  SPEC = eval(File.read('tilt.gemspec'))

  def package(ext='')
    "pkg/tilt-#{SPEC.version}" + ext
  end

  desc 'Build packages'
  task :package => %w[.gem .tar.gz].map {|e| package(e)}

  desc 'Build and install as local gem'
  task :install => package('.gem') do
    sh "gem install #{package('.gem')}"
  end

  directory 'pkg/'

  file package('.gem') => %w[pkg/ tilt.gemspec] + SPEC.files do |f|
    sh "gem build tilt.gemspec"
    mv File.basename(f.name), f.name
  end

  file package('.tar.gz') => %w[pkg/] + SPEC.files do |f|
    sh "git archive --format=tar HEAD | gzip > #{f.name}"
  end

  desc 'Upload gem and tar.gz distributables to rubyforge'
  task :release => [package('.gem'), package('.tar.gz')] do |t|
    sh <<-SH
      rubyforge add_release sinatra tilt #{SPEC.version} #{package('.gem')} &&
      rubyforge add_file    sinatra tilt #{SPEC.version} #{package('.tar.gz')}
    SH
  end
end

# GEMSPEC ===================================================================

file 'tilt.gemspec' => FileList['{lib,test}/**','Rakefile'] do |f|
  # read version from tilt.rb
  version = File.read('lib/tilt.rb')[/VERSION = '(.*)'/] && $1
  # read spec file and split out manifest section
  spec = File.
    read(f.name).
    sub(/s\.version\s*=\s*'.*'/, "s.version = '#{version}'")
  parts = spec.split("  # = MANIFEST =\n")
  # determine file list from git ls-files
  files = `git ls-files`.
    split("\n").sort.reject{ |file| file =~ /^\./ }.
    map{ |file| "    #{file}" }.join("\n")
  # piece file back together and write...
  parts[1] = "  s.files = %w[\n#{files}\n  ]\n"
  spec = parts.join("  # = MANIFEST =\n")
  spec.sub!(/s.date = '.*'/, "s.date = '#{Time.now.strftime("%Y-%m-%d")}'")
  File.open(f.name, 'w') { |io| io.write(spec) }
  puts "updated #{f.name}"
end
