def bail_on_failure
  exitstatus = $?.exitstatus
  if exitstatus != 0
    err "last command failed with exit status #{exitstatus}"
    exit 1
  end
end

def version
  `git describe`.chomp
end

def rubygems_version
  # RubyGems will barf if we try to pass an intermediate version number
  # like "1.1b2-10-g61a374a", so no choice but to abbreviate it
  `git describe --abbrev=0`.chomp
end

def yellow
  "\033[33m"
end

def red
  "\033[31m"
end

def clear
  "\033[0m"
end

def warn(str)
  puts "#{yellow}warning: #{str}#{clear}"
end

def err(str)
  puts "#{red}error: #{str}#{clear}"
end

task :default => :help

desc 'Print help on preparing a release'
task :help do
  puts <<-END

The general release sequence is:

  rake prerelease
  rake gem
  rake push

For a full list of available tasks:

  rake -T

  END
end

desc 'Run specs'
task :spec do
  system 'bundle exec rspec spec'
  bail_on_failure
end

desc 'Create archive'
task :archive => :check_tag do
  system "git archive -o command-t-#{version}.zip HEAD -- ."
  bail_on_failure
end

desc 'Clean compiled products'
task :clean do
  Dir.chdir 'ruby/command-t/ext/command-t' do
    system 'make clean' if File.exists?('Makefile')
    system 'rm -f Makefile'
  end
end

desc 'Compile extension'
task :make do
  Dir.chdir 'ruby/command-t/ext/command-t' do
    ruby 'extconf.rb'
    system 'make clean'
    bail_on_failure
    system 'make'
    bail_on_failure
  end
end

desc 'Check that the current HEAD is tagged'
task :check_tag do
  unless system 'git describe --exact-match HEAD 2> /dev/null'
    warn 'current HEAD is not tagged'
  end
end

desc 'Run checks prior to release'
task :prerelease => [:make, :spec, :archive, :check_tag]

desc 'Create the ruby gem package'
task :gem => :check_tag do
  Dir.chdir 'ruby/command-t' do
    sh "gem build command-t.gemspec"
  end
end

desc 'Push gem to Gemcutter ("gem push")'
task :push => :gem do
  Dir.chdir 'ruby/command-t' do
    sh "gem push command-t-#{rubygems_version}.gem"
  end
end