Class: Middleman::Extensions::ExternalPipeline

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

Constant Summary

Constants included from Contracts

Contracts::PATH_MATCHER

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.



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
 
# File 'middleman-core/lib/middleman-core/extensions/external_pipeline.rb', line 11

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 



44
45
46
47
48
49
50
51
 
# File 'middleman-core/lib/middleman-core/extensions/external_pipeline.rb', line 44

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

    @current_thread.stop
    @current_thread = nil
  end
end

#watch_command!(async) ⇒ Object 



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'middleman-core/lib/middleman-core/extensions/external_pipeline.rb', line 53

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 !options[:ignore_exit_code] && !@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