kill an active chrome tab using the DevTools API

tabkill.rb

#!/usr/bin/env ruby

require 'json'
require 'thread'

def eep
  `mplayer #{ENV['HOME'] + '/.killsound'}`
end

def tabs
  @_tabs ||= JSON.
    parse(`curl -s localhost:9222/json`).
    select { |t| t.fetch('url').start_with?('http') }.
    select { |t| t.fetch('type') == 'page' }
end

def tabs_with_url(snippet)
  tabs.select { |t| t.fetch('url') =~ /#{snippet}/ }
end

def tabs_named(snippet)
  tabs.select { |t| t.fetch('title') =~ /#{snippet}/ }
end

def kill_tab(tab)
  id = tab.fetch('id')
  STDERR.puts("Killing tab [#{tab.fetch('title')}]")
  `curl -s localhost:9222/json/close/#{id}`
end

def nag(msg)
  `nag Killed tab #{msg}`
end

def main
  names = ARGV
  names.each do |name|
    Thread.new {
      puts "Looking for tabs named #{name}"
      tabs = tabs_with_url(name)

      if tabs.any?
	tabs.each do |t|
	  Thread.new{ kill_tab t }.join
	end

	Thread.new { nag name }.join

	Thread.new { eep }.join
      end
    }.join
  end
end

main