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class Middleman::Extensions::ExternalPipeline < ::Middleman::Extension
self.supports_multiple_instances = true
option :name, nil, 'The name of the pipeline', required: true
option :command, nil, 'The command to initialize', required: true
option :source, nil, 'Path to merge into sitemap', required: true
option :latency, 0.25, 'Latency between refreshes of source'
option :disable_background_execution, false, "Don't run the command in a separate background thread"
def initialize(app, options_hash = ::Middleman::EMPTY_HASH, &block)
super
return if app.mode?(:config)
require 'servolux'
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
def reload!
return unless @current_thread
logger.info "== Stopping: `#{options[:command]}`"
@current_thread.stop
@current_thread = nil
end
def watch_command!(async)
@current_thread = ::Servolux::Child.new(
command: options[:command],
suspend: 2
)
@current_thread.start
watch_thread = Thread.new do
buf = @current_thread.io.gets
while buf
without_newline = buf.sub(/\n$/, '')
logger.info "== External: #{without_newline}" unless without_newline.empty?
buf = @current_thread.io.gets
end
@current_thread.wait
if !@current_thread.exitstatus.nil? && @current_thread.exitstatus != 0
logger.error '== External: Command failed with non-zero exit status'
exit(1)
end
end
watch_thread.join unless async
rescue ::Errno::ENOENT => e
logger.error "== External: Command failed with message: #{e.message}"
exit(1)
end
private
def print_command(stdout)
buf = stdout.gets
while buf
without_newline = buf.sub(/\n$/, '')
logger.info "== External: #{without_newline}" unless without_newline.empty?
buf = stdout.gets
end
end
end