Class: Middleman::Extensions::ExternalPipeline

Inherits:
Middleman::Extension show all
Defined in:
lib/middleman-core/extensions/external_pipeline.rb

Constant Summary

Constants included from Contracts

Contracts::PATH_MATCHER, Contracts::ResourceList, Contracts::VectorOf

Instance Attribute Summary

Attributes inherited from Middleman::Extension

#app, #options

Instance Method Summary collapse

Methods inherited from Middleman::Extension

activated_extension, #add_exposed_to_context, #after_build, #after_configuration, after_extension_activated, #after_extension_activated, #before_build, #before_configuration, clear_after_extension_callbacks, config, define_setting, expose_to_application, expose_to_config, expose_to_template, global_config, helpers, #manipulate_resource_list, option, #ready, resources

Methods included from Contracts

#Contract

Constructor Details

#initialize(app, config = {}, &block) ⇒ ExternalPipeline

Returns a new instance of ExternalPipeline



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# File 'lib/middleman-core/extensions/external_pipeline.rb', line 10

def initialize(app, config={}, &block)
  super

  return if app.mode?(:config)

  require 'servolux'
  require 'thread'
  require 'fileutils'

  source_path = File.expand_path(options[:source], app.root)

  # Make sure it exists, or `listen` will explode.
  ::FileUtils.mkdir_p(source_path)

  @watcher = app.files.watch :source,
                             path: source_path,
                             latency: options[:latency],
                             frontmatter: false

  @current_thread = nil
  app.reload(&method(:reload!))

  logger.info "== Executing: `#{options[:command]}`"

  if app.build? || options[:disable_background_execution]
    watch_command!(false)

    @watcher.poll_once!
  else
    watch_command!(true)
  end
end

Instance Method Details

#reload!Object



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# File 'lib/middleman-core/extensions/external_pipeline.rb', line 43

def reload!
  if @current_thread
    logger.info "== Stopping: `#{options[:command]}`"

    @current_thread.stop
    @current_thread = nil
  end
end

#watch_command!(async) ⇒ Object



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# File 'lib/middleman-core/extensions/external_pipeline.rb', line 52

def watch_command!(async)
  @current_thread = ::Servolux::Child.new(
    command: options[:command],
    suspend: 2
  )

  @current_thread.start

  watch_thread = Thread.new do
    while buf = @current_thread.io.gets
      without_newline = buf.sub(/\n$/, '')
      logger.info "== External: #{without_newline}" unless without_newline.empty?
    end

    @current_thread.wait

    if !@current_thread.exitstatus.nil? && @current_thread.exitstatus != 0
      logger.error '== External: Command failed with non-zero exit status'
      exit(1)
    end
  end

  watch_thread.join unless async
rescue ::Errno::ENOENT => e
  logger.error "== External: Command failed with message: #{e.message}"
  exit(1)
end