Module: Retest::Watcher::Default

Defined in:
lib/retest/watcher.rb

Class Method Summary collapse

Class Method Details

.extensions_regex(extensions) ⇒ Object 



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# File 'lib/retest/watcher.rb', line 29

def self.extensions_regex(extensions)
  Regexp.new("\\.(?:#{extensions.join("|")})$")
end

.installed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/retest/watcher.rb', line 25

def self.installed?
  true
end

.watch(dir:, extensions:, polling: false) ⇒ Object 



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# File 'lib/retest/watcher.rb', line 33

def self.watch(dir:, extensions:, polling: false)
  executable = File.expand_path("../../scripts/listen", __FILE__)
  command = "#{executable} --exts #{extensions.join(',')} -w #{dir} --polling #{polling}"

  watch_rd, watch_wr = IO.pipe
  # Process needs its own process group otherwise the process gets killed on INT signal
  # We need the process to still run when trying to stop the current test run
  # Maybe there is another way to prevent killing these but for now a new process groups works
  # Process group created with: pgroup: true
  pid = Process.spawn(command, out: watch_wr, pgroup: true)

  thread = Thread.new do
    loop do
      ready = IO.select([watch_rd])
      readable_connections = ready[0]
      readable_connections.each do |conn|
        data = conn.readpartial(4096)
        change = /^(?<action>create|remove|modify):(?<path>.*)/.match(data.strip)

        next unless change

        modified, added, removed = result = [[], [], []]
        case change[:action]
        when 'modify' then modified << change[:path]
        when 'create' then added << change[:path]
        when 'remove' then removed << change[:path]
        end

        yield result
      end
    end
  end

  at_exit do
    thread.exit
    Process.kill("TERM", pid) if pid
    watch_rd.close
    watch_wr.close
  end
end