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require 'listen'
require 'set'
require 'pathname'
module ActiveSupport
class FileEventedUpdateChecker #:nodoc: all
def initialize(files, dirs = {}, &block)
@ph = PathHelper.new
@files = files.map { |f| @ph.xpath(f) }.to_set
@dirs = {}
dirs.each do |dir, exts|
@dirs[@ph.xpath(dir)] = Array(exts).map { |ext| @ph.normalize_extension(ext) }
end
@block = block
@updated = false
@lcsp = @ph.longest_common_subpath(@dirs.keys)
if (dtw = directories_to_watch).any?
Listen.to(*dtw, &method(:changed)).start
end
end
def updated?
@updated
end
def execute
@block.call
ensure
@updated = false
end
def execute_if_updated
if updated?
execute
true
end
end
private
def changed(modified, added, removed)
unless updated?
@updated = (modified + added + removed).any? { |f| watching?(f) }
end
end
def watching?(file)
file = @ph.xpath(file)
if @files.member?(file)
true
elsif file.directory?
false
else
ext = @ph.normalize_extension(file.extname)
file.dirname.ascend do |dir|
if @dirs.fetch(dir, []).include?(ext)
break true
elsif dir == @lcsp || dir.root?
break false
end
end
end
end
def directories_to_watch
dtw = (@files + @dirs.keys).map { |f| @ph.existing_parent(f) }
dtw.compact!
dtw.uniq!
@ph.filter_out_descendants(dtw)
end
class PathHelper
using Module.new {
refine Pathname do
def ascendant_of?(other)
self != other && other.ascend do |ascendant|
break true if self == ascendant
end
end
end
}
def xpath(path)
Pathname.new(path).expand_path
end
def normalize_extension(ext)
ext.to_s.sub(/\A\./, '')
end
# Given a collection of Pathname objects returns the longest subpath
# common to all of them, or +nil+ if there is none.
def longest_common_subpath(paths)
return if paths.empty?
lcsp = Pathname.new(paths[0])
paths[1..-1].each do |path|
until lcsp.ascendant_of?(path)
if lcsp.root?
# If we get here a root directory is not an ascendant of path.
# This may happen if there are paths in different drives on
# Windows.
return
else
lcsp = lcsp.parent
end
end
end
lcsp
end
# Returns the deepest existing ascendant, which could be the argument itself.
def existing_parent(dir)
dir.ascend do |ascendant|
break ascendant if ascendant.directory?
end
end
# Filters out directories which are descendants of others in the collection (stable).
def filter_out_descendants(dirs)
return dirs if dirs.length < 2
dirs_sorted_by_nparts = dirs.sort_by { |dir| dir.each_filename.to_a.length }
descendants = []
until dirs_sorted_by_nparts.empty?
dir = dirs_sorted_by_nparts.shift
dirs_sorted_by_nparts.reject! do |possible_descendant|
dir.ascendant_of?(possible_descendant) && descendants << possible_descendant
end
end
# Array#- preserves order.
dirs - descendants
end
end
end
end
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