seki

require 'drip'

class Driprox
  def initialize(drip, port, remote_host, remote_port)
    @drip = drip
    @server = TCPServer.new(port)
    @hostname = remote_host
    @port = remote_port
    @origin = @drip.write(nil, 'start')
  end

seki

module OnGC
  module_function
  def on_gc(&blk)
    ObjectSpace.define_finalizer(Object.new, &blk)
  end
end

seki

run server

% ruby -I../lib tiny_drb.rb

run client (irb)

% irb -r drb
irb(main):001:0> ro = DRbObject.new_with_uri('druby://localhost:12345')
irb(main):002:0> ro.hello(1, 2.0, "3")

=> ["hello", [1, 2.0, "3"]]

seki

# -*- coding: utf-8 -*-
require 'socket'
require 'fiber'

module Bartender
  class App
    def initialize
      @input = {}
      @output = {}
    end

seki

#!/usr/bin/ruby
footprint = File.mtime("/tmp/haltkey") rescue Time.at(1)
if Time.now - footprint < 10
  File.write("/sys/class/leds/led0/trigger", "timer")
  File.write("/sys/class/leds/led0/delay_on", "250")
  File.write("/sys/class/leds/led0/delay_off", "125")
  system("/sbin/halt")
else
  File.write("/sys/class/leds/led0/trigger", "mmc0")
end

seki

#!/usr/bin/ruby
File.write("/sys/class/leds/led0/trigger", "heartbeat")
File.write("/tmp/haltkey", Time.now.to_s)

seki

ATTRS{idVendor}=="0781", ATTRS{serial}=="200607753009D74236F6", SUBSYSTEMS=="usb", ACTION=="add", RUN+="/home/pi/ledh.sh"
ATTRS{idVendor}=="0781", ATTRS{serial}=="200607753009D74236F6", SUBSYSTEMS=="usb", ACTION=="remove", RUN+="/home/pi/ledx.sh"

seki

#!/bin/sh
echo timer > /sys/class/leds/led0/trigger
echo 250 > /sys/class/leds/led0/delay_on
echo 125 > /sys/class/leds/led0/delay_off

seki

module GPIO
  module_function

  def export(n, dir)
    File.open("/sys/class/gpio/export", "w") do |fp|
      fp.write(n.to_s)
    end
    sleep 0.1
    File.open("/sys/class/gpio/gpio#{n}/direction", "w") do |fp|
      fp.write(dir)

seki

module Enumerable
  def product_enum(*other)
    return to_enum(__method__, *other) unless block_given?
    if other.empty?
      each {|x| yield([x])}
    else
      car, *cdr = other
      each do |x|
        car.rewind
        car.product_enum(*cdr) {|y| yield([x] + y)}