Erlang "autotest" -- run your eunit suites automatically when changing files (uses rebar + Ruby guard)

Gemfile

source 'http://rubygems.org'

group :development, :test do
  gem 'guard-shell'
  gem 'rb-fsevent'
  gem 'growl'
end

Guardfile

# automatically run the eunit tests

def run_eunit(src, suite)
  if File.exist?(File.join(File.dirname(__FILE__), 'test', "#{suite}_tests.erl"))
    cmd = "./rebar eunit skip_deps=true suite=#{suite}"
    puts "Executing #{cmd}"
    puts `#{cmd}`
    if $? == 0
      Growl.notify_ok "#{suite}: eunit passed."
    else
      Growl.notify_error "#{suite}: eunit failed."
    end
  else
    puts "No tests for #{suite.inspect}"
    Growl.notify_warning "No tests for #{suite}!"
  end
end

guard 'shell' do
  watch(%r{(src|test)/([^.].*?)(_tests)?.erl}) {|m| run_eunit(m[1], m[2]) }
end