Class: Racker::Processor

Inherits:
Object
  • Object
show all
Defined in:
lib/racker/processor.rb

Overview

This class handles command line options.

Constant Summary collapse

CONFIGURE_MUTEX = 
Mutex.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/racker/processor.rb', line 14

def initialize(options)
  @options = options
end

Class Method Details

.register_template(version = '1', &block) ⇒ Object

This is a class method so the templates can load it



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# File 'lib/racker/processor.rb', line 86

def self.register_template(version='1',&block)
  @@last_procs ||= []
  @@last_procs << [version, block]
end

Instance Method Details

#capture_templates ⇒ Object 



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# File 'lib/racker/processor.rb', line 91

def capture_templates
  CONFIGURE_MUTEX.synchronize do
    @@last_procs = []

    yield

    return @@last_procs
  end
end

#execute! ⇒ Object 



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# File 'lib/racker/processor.rb', line 18

def execute!
  # Get the global logger
  log = Log4r::Logger['racker']
  
  # Verify that the templates exist
  @options[:templates].each do |template|
    raise "File does not exist!  (#{template})" unless ::File.exists?(template)
  end

  # Check that the output directory exists
  output_dir = File.dirname(File.expand_path(@options[:output]))

  # If the output directory doesnt exist
  log.info('Creating the output directory if it does not exist...')
  FileUtils.mkdir_p output_dir unless File.exists? output_dir

  # Load the templates
  templates = []

  # Load the template procs
  log.info('Loading racker templates...')
  template_procs = load(@options[:templates])

  # Load the actual templates
  log.info('Processing racker templates...')
  template_procs.each do |version,proc|
    # Create the new template
    template = Racker::Template.new

    # Run the block with the template
    proc.call(template)

    # Store the template
    templates << template
  end
  log.info('Racker template processing complete.')

  # Get the first template and merge each subsequent one on the latest
  log.info('Merging racker templates...')
  current_template = templates.shift

  # Overlay the templates
  templates.each do |template|
    current_template = current_template.deep_merge!(template, {:knockout_prefix => @options[:knockout]})
  end
  
  # Compact the residual template to remove nils
  log.info('Compacting racker template...')
  compact_template = current_template.compact(:recurse => true)

  # Write the compact template out to file
  File.open(@options[:output], 'w') do |file|
    log.info('Writing packer template...') 
    file.write(JSON.pretty_generate(compact_template.to_packer))
    log.info('Writing packer template complete.') 
  end
end

#load(templates) ⇒ Object 



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# File 'lib/racker/processor.rb', line 76

def load(templates)
  return capture_templates do
    templates.each do |template|
      puts "Loading template file: #{template}" unless @options[:quiet]
      Kernel.load template
    end
  end
end