Rakefile

require 'rubygems'
require 'rake'
require 'date'

#############################################################################
#
# Helper functions
#
#############################################################################

def name
  @name ||= Dir['*.gemspec'].first.split('.').first
end

def version
  line = File.read("lib/#{name}.rb")[/^\s*VERSION\s*=\s*.*/]
  line.match(/.*VERSION\s*=\s*['"](.*)['"]/)[1]
end

def date
  Date.today.to_s
end

def rubyforge_project
  name
end

def gemspec_file
  "#{name}.gemspec"
end

def gem_file
  "#{name}-#{version}.gem"
end

def replace_header(head, header_name)
  head.sub!(/(\.#{header_name}\s*= ').*'/) { "#{$1}#{send(header_name)}'"}
end

#############################################################################
#
# Standard tasks
#
#############################################################################

task :default => :test

require 'rake/testtask'
Rake::TestTask.new(:test) do |test|
  test.libs << 'lib' << 'test'
  test.pattern = 'test/**/test_*.rb'
  test.verbose = true
end

desc "Generate RCov test coverage and open in your browser"
task :coverage do
  require 'rcov'
  sh "rm -fr coverage"
  sh "rcov test/test_*.rb"
  sh "open coverage/index.html"
end

require 'rake/rdoctask'
Rake::RDocTask.new do |rdoc|
  rdoc.rdoc_dir = 'rdoc'
  rdoc.title = "#{name} #{version}"
  rdoc.rdoc_files.include('README*')
  rdoc.rdoc_files.include('lib/**/*.rb')
end

desc "Open an irb session preloaded with this library"
task :console do
  sh "irb -rubygems -r ./lib/#{name}.rb"
end

#############################################################################
#
# Custom tasks (add your own tasks here)
#
#############################################################################



#############################################################################
#
# Packaging tasks
#
#############################################################################

desc "release #{name} version #{version} (after updating and building)"
task :release => 'release:default'
namespace :release do
  task :default => :build do
    unless `git branch` =~ /^\* master$/
      puts "You must be on the master branch to release!"
      exit!
    end
    sh "git commit --allow-empty -a -m 'Release #{version}'"
    sh "git tag v#{version}"
    sh "git push origin master"
    sh "git push origin v#{version}"
    sh "gem push pkg/#{name}-#{version}.gem"
  end

  desc "build #{name} version #{version} (after updating)"
  task :build => :gemspec do
    sh "mkdir -p pkg"
    sh "gem build #{gemspec_file}"
    sh "mv #{gem_file} pkg"
  end
  
  desc "build and install #{name} version #{version} locally"
  task :install => :build do
    sh "gem install pkg/#{gem_file}"
  end

  desc "update #{name}.gemspec"
  task :gemspec => 'release:gemspec:generate'
  namespace :gemspec do
    task :generate => :validate do
      # read spec file and split out manifest section
      spec = File.read(gemspec_file)
      head, manifest, tail = spec.split("  # = MANIFEST =\n")

      # replace name version and date
      replace_header(head, :name)
      replace_header(head, :version)
      replace_header(head, :date)
      #comment this out if your rubyforge_project has a different name
      replace_header(head, :rubyforge_project)

      # determine file list from git ls-files
      files = `git ls-files`.
        split("\n").
        sort.
        reject { |file| file =~ /^\./ }.
        reject { |file| file =~ /^(rdoc|pkg)/ }.
        map { |file| "    #{file}" }.
        join("\n")

      # piece file back together and write
      manifest = "  s.files = %w[\n#{files}\n  ]\n"
      spec = [head, manifest, tail].join("  # = MANIFEST =\n")
      File.open(gemspec_file, 'w') { |io| io.write(spec) }
      puts "Updated #{gemspec_file}"
    end

    task :validate do
      libfiles = Dir['lib/*'] - ["lib/#{name}.rb", "lib/#{name}"]
      unless libfiles.empty?
        puts "Directory `lib` should only contain a `#{name}.rb` file and `#{name}` dir."
        exit!
      end
      unless Dir['VERSION*'].empty?
        puts "A `VERSION` file at root level violates Gem best practices."
        exit!
      end
    end
  end
end