# Guardfile that demonstrates hooking RSpec results
# and blinking notifyications on the Fomu RGB LED
# using the wishbone-tool to control a RISC-V notification program running on the Fomu

# The Fomu/wishbone-tool integration lives here
class Guard::FomuNotifier
  NOTIFIER_ADDR = '0x0000000010000230'
  LED_STATES = ['running', 'idle', 'success', 'failed']

  # Command: set the Fomu RGB LED state
  def self.set_rbg(status)
    command = "wishbone-tool #{NOTIFIER_ADDR} #{LED_STATES.index(status) || 3} 2> /dev/null"
    system(command)
  end

  # callback target so we know when a build starts
  def call(guard_class, event, *args)
    status = if event == :start_begin
      'idle'
    else
      'running'
    end
    self.class.set_rbg status
  end
end

guard :rspec, cmd: "bundle exec rspec" do
  require "guard/rspec/dsl"
  dsl = Guard::RSpec::Dsl.new(self)

  # RSpec files
  rspec = dsl.rspec
  watch(rspec.spec_helper) { rspec.spec_dir }
  watch(rspec.spec_files)

  # Ruby files
  ruby = dsl.ruby
  dsl.watch_spec_files_for(ruby.lib_files)

  # rspec test results go to file (unfortunately cannot receive with callbacks)
  notification :file, path: '.guard_result'

  # setup the callbacks so we know when things start
  callback(FomuNotifier.new, [
    :run_all_begin, :run_on_additions_begin, :run_on_modifications_begin, :run_on_removals_begin, :start_begin
  ])
end

# watch the rspec results file so can trigger Fomu depending on the result
guard :shell do
  watch '.guard_result' do
    Guard::FomuNotifier.set_rbg File.read('.guard_result').lines.first.strip
  end
end