autovalidate

#!/usr/bin/env ruby
# 
# xmlvwatch - stoopid program to "watch" an xml document and its xsd,
# changing screen color as the document is validated/invalidated.
# Basically, this is a poor man's autospec.

require 'appscript'
require 'libxml'
require 'ruby-debug'
require 'sparky'
include Appscript

class XmlValidateWatcher
  attr_reader :xml, :xsd, :errors, :xmlstat, :xsdstat
  @@use_sparky = 0
  
  def initialize(xml, xsd)
    @xml, @xsd = xml, xsd
    raise "Could not open XML file" unless File.exist?(xml)
    raise "Could not open XSD file" unless File.exist?(xsd)

    iterm = Appscript::app('iTerm')
    @term = iterm.current_terminal.sessions.get.find {|sess| sess.get == iterm.current_terminal.current_session.get }

    @sparky = Sparky.new if use_sparky?
  end
  
  def self.use_sparky!
    @@use_sparky = true
  end
  
  def self.no_sparky!
    @@use_sparky = false
  end
  
  def use_sparky?
    @@use_sparky
  end

  def header
    puts "\033[2J\033[H"
    puts "autovalidate #{@xml} #{@xsd}"
    puts "Last validated: #{Time.now.strftime('%Y-%m-%d %H:%M:%S')}"
    puts
  end

  def red
    @term.background_color.set [32768, 0, 0]
    @sparky.reset && @sparky.failed if use_sparky?
  end

  def green
    @term.background_color.set [0, 32768, 0]
    @sparky.reset && @sparky.pass if use_sparky?
  end

  def validate
    @sparky.reset && @sparky.run if use_sparky?
    header
    result = false
    begin
      document = LibXML::XML::Document.file(@xml)
      schema = LibXML::XML::Schema.new(@xsd)
      result = document.validate_schema(schema)
    rescue 
      nil
    end 
    result ? green : red
  end
  
  def changed?
    @newxmlstat, @newxsdstat = File.mtime(@xml), File.mtime(@xsd)
    c = @xmlstat != @newxmlstat || @xsdstat != @newxsdstat
    @xmlstat, @xsdstat = @newxmlstat, @newxsdstat
    c
  end
  
  def run
    while true
      validate if changed?
      sleep 0.1
    end
  end
end

if $0 == __FILE__
  args = ARGV.dup
  if args.include?("--sparky")
    XmlValidateWatcher.use_sparky!
    args.delete("--sparky")
  else
    XmlValidateWatcher.no_sparky!
  end

  watcher = XmlValidateWatcher.new(args[0], args[1])
  watcher.run
end