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require 'listen'
require 'set'
require 'pathname'
module ActiveSupport
class FileEventedUpdateChecker
def initialize(files, dirs={}, &block)
@files = files.map {|f| expand_path(f)}.to_set
@dirs = {}
dirs.each do |dir, exts|
@dirs[expand_path(dir)] = Array(exts).map(&:to_s)
end
@block = block
@modified = false
if (watch_dirs = base_directories).any?
Listen.to(*watch_dirs, &method(:changed)).start
end
end
def updated?
@modified
end
def execute
@block.call
ensure
@modified = false
end
def execute_if_updated
if updated?
execute
true
end
end
private
def expand_path(fname)
File.expand_path(fname)
end
def changed(modified, added, removed)
return if updated?
if (modified + added + removed).any? {|f| watching?(f)}
@modified = true
end
end
def watching?(file)
file = expand_path(file)
return true if @files.member?(file)
file = Pathname.new(file)
return false if file.directory?
ext = file.extname.sub(/\A\./, '')
dir = file.dirname
loop do
if @dirs.fetch(dir.to_path, []).include?(ext)
break true
else
if dir.root? # TODO: find a common parent directory in initialize
break false
end
dir = dir.parent
end
end
end
# TODO: Better return a list of non-nested directories.
def base_directories
[].tap do |bd|
bd.concat @files.map {|f| existing_parent(File.dirname(f))}
bd.concat @dirs.keys.map {|dir| existing_parent(dir)}
bd.compact!
bd.uniq!
end
end
def existing_parent(dir)
dir = Pathname.new(File.expand_path(dir))
loop do
if dir.directory?
break dir.to_path
else
if dir.root?
# Edge case in which not even the root exists. For example, Windows
# paths could have a non-existing drive letter. Since the parent of
# root is root, we need to break to prevent an infinite loop.
break
else
dir = dir.parent
end
end
end
end
end
end
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