continuous_testing

#!/usr/bin/env ruby

@all_files ={}

class ChangedFile
  attr_accessor :name,:last_changed_time

  def initialize(name)
    @name = name
    @last_changed_time = File.mtime(name)
  end

  def has_changed?
    @last_changed_time < File.mtime(@name)
  end

  def update
    @last_changed_time = File.mtime(@name)
  end

  def was_deleted?
    not File.exists?(@name)
  end
end


class BuildMessage
  def initialize(error_items)
    @error_items = error_items
  end

  def successful
    @error_items.length == 0
  end

  def message
    successful ? "Build Successful" : @error_items.join("\r\n")
  end
end


def scan_for_new_files
  has_new_files = false
  Dir.glob("**/*.cs").each do|file|
    unless (@all_files.key?(file))
      has_new_files = true
      @all_files[file] = ChangedFile.new(file)
    end
  end
  has_new_files
end

def remove_all_deleted
  remaining = @all_files.select{|path,item| ! item.was_deleted?}
  files_were_deleted = remaining.length != @all_files.length
  @all_files = remaining
  files_were_deleted
end

def changes_have_occured
  return scan_for_new_files | remove_all_deleted | files_have_changed
end

def files_have_changed
  has_changed = false
  @all_files.each do|path,file|
    has_changed |= file.has_changed?
    file.update
  end
  return has_changed
end

def get_errors_in(output)
  error_pattern = /error|FAIL/
  output.split("\n").select{|item| error_pattern =~ item}
end

def notify(build_message)
  icon = build_message.successful ? "green" : "red"
  args = {:t => "Build",:i => ".\\#{icon}.jpg"}
  command_line = "build/tools/growl/growlnotify.exe"
  args.each {|key,value| command_line += " /#{key}:\"#{value}\""}
  `#{command_line} "#{build_message.message}"`
end

def monitor
  if changes_have_occured
    errors = get_errors_in(`rake specs:run`)
    notify(BuildMessage.new(errors))
  end
end

while true do
  monitor
  sleep(1)
end