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# frozen_string_literal: true
# Listener implementation for BSD's `kqueue`.
# @see http://www.freebsd.org/cgi/man.cgi?query=kqueue
# @see https://github.com/mat813/rb-kqueue/blob/master/lib/rb-kqueue/queue.rb
#
module Listen
module Adapter
class BSD < Base
OS_REGEXP = /bsd|dragonfly/i.freeze
DEFAULTS = {
events: [
:delete,
:write,
:extend,
:attrib,
:rename
# :link, :revoke
]
}.freeze
BUNDLER_DECLARE_GEM = <<-EOS.gsub(/^ {6}/, '')
Please add the following to your Gemfile to avoid polling for changes:
require 'rbconfig'
if RbConfig::CONFIG['target_os'] =~ /#{OS_REGEXP}/
gem 'rb-kqueue', '>= 0.2'
end
EOS
def self.usable?
return false unless super
require 'rb-kqueue'
require 'find'
true
rescue LoadError
Listen.adapter_warn(BUNDLER_DECLARE_GEM)
false
end
private
def _configure(directory, &callback)
@worker ||= KQueue::Queue.new
@callback = callback
# use Record to make a snapshot of dir, so we
# can detect new files
_find(directory.to_s) { |path| _watch_file(path, @worker) }
end
def _run
@worker.run
end
def _process_event(dir, event)
full_path = _event_path(event)
if full_path.directory?
# Force dir content tracking to kick in, or we won't have
# names of added files
_queue_change(:dir, dir, '.', recursive: true)
elsif full_path.exist?
path = full_path.relative_path_from(dir)
_queue_change(:file, dir, path.to_s, change: _change(event.flags))
end
# If it is a directory, and it has a write flag, it means a
# file has been added so find out which and deal with it.
# No need to check for removed files, kqueue will forget them
# when the vfs does.
_watch_for_new_file(event) if full_path.directory?
end
def _change(event_flags)
{ modified: [:attrib, :extend],
added: [:write],
removed: [:rename, :delete] }.each do |change, flags|
return change unless (flags & event_flags).empty?
end
nil
end
def _event_path(event)
Pathname.new(event.watcher.path)
end
def _watch_for_new_file(event)
queue = event.watcher.queue
_find(_event_path(event).to_s) do |file_path|
unless queue.watchers.find { |_, v| v.path == file_path.to_s }
_watch_file(file_path, queue)
end
end
end
def _watch_file(path, queue)
queue.watch_file(path, *options.events, &@callback)
rescue Errno::ENOENT => e
Listen.logger.warn "kqueue: watch file failed: #{e.message}"
end
# Quick rubocop workaround
def _find(*paths, &block)
Find.send(:find, *paths, &block)
end
end
end
end
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