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# frozen_string_literal: true
module Listen
class QueueOptimizer
class Config
def initialize(adapter_class, silencer)
@adapter_class = adapter_class
@silencer = silencer
end
def exist?(path)
Pathname(path).exist?
end
def silenced?(path, type)
@silencer.silenced?(path, type)
end
def debug(*args, &block)
Listen.logger.debug(*args, &block)
end
end
def smoosh_changes(changes)
# TODO: adapter could be nil at this point (shutdown)
cookies = changes.group_by do |_, _, _, _, options|
(options || {})[:cookie]
end
_squash_changes(_reinterpret_related_changes(cookies))
end
def initialize(config)
@config = config
end
private
attr_reader :config
# groups changes into the expected structure expected by
# clients
def _squash_changes(changes)
# We combine here for backward compatibility
# Newer clients should receive dir and path separately
changes = changes.map { |change, dir, path| [change, dir + path] }
actions = changes.group_by(&:last).map do |path, action_list|
[_logical_action_for(path, action_list.map(&:first)), path.to_s]
end
config.debug("listen: raw changes: #{actions.inspect}")
{ modified: [], added: [], removed: [] }.tap do |squashed|
actions.each do |type, path|
squashed[type] << path unless type.nil?
end
config.debug("listen: final changes: #{squashed.inspect}")
end
end
def _logical_action_for(path, actions)
actions << :added if actions.delete(:moved_to)
actions << :removed if actions.delete(:moved_from)
modified = actions.find { |x| x == :modified }
_calculate_add_remove_difference(actions, path, modified)
end
def _calculate_add_remove_difference(actions, path, default_if_exists)
added = actions.count { |x| x == :added }
removed = actions.count { |x| x == :removed }
diff = added - removed
# TODO: avoid checking if path exists and instead assume the events are
# in order (if last is :removed, it doesn't exist, etc.)
if config.exist?(path)
if diff > 0
:added
elsif diff.zero? && added > 0
:modified
else
default_if_exists
end
else
diff < 0 ? :removed : nil
end
end
# remove extraneous rb-inotify events, keeping them only if it's a possible
# editor rename() call (e.g. Kate and Sublime)
def _reinterpret_related_changes(cookies)
table = { moved_to: :added, moved_from: :removed }
cookies.flat_map do |_, changes|
if (editor_modified = editor_modified?(changes))
[[:modified, *editor_modified]]
else
not_silenced = changes.reject do |type, _, _, path, _|
config.silenced?(Pathname(path), type)
end
not_silenced.map do |_, change, dir, path, _|
[table.fetch(change, change), dir, path]
end
end
end
end
def editor_modified?(changes)
return unless changes.size == 2
from_type = from = nil
to_type = to_dir = to = nil
changes.each do |data|
case data[1]
when :moved_from
from_type, _from_change, _, from, = data
when :moved_to
to_type, _to_change, to_dir, to, = data
end
end
# Expect an ignored moved_from and non-ignored moved_to
# to qualify as an "editor modify"
if from && to && config.silenced?(Pathname(from), from_type) && !config.silenced?(Pathname(to), to_type)
[to_dir, to]
end
end
end
end
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