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# frozen_string_literal: true
#
# find.rb: the Find module for processing all files under a given directory.
#
#
# The +Find+ module supports the top-down traversal of a set of file paths.
#
# For example, to total the size of all files under your home directory,
# ignoring anything in a "dot" directory (e.g. $HOME/.ssh):
#
# require 'find'
#
# total_size = 0
#
# Find.find(ENV["HOME"]) do |path|
# if FileTest.directory?(path)
# if File.basename(path)[0] == ?.
# Find.prune # Don't look any further into this directory.
# else
# next
# end
# else
# total_size += FileTest.size(path)
# end
# end
#
module Find
#
# Calls the associated block with the name of every file and directory listed
# as arguments, then recursively on their subdirectories, and so on.
#
# Returns an enumerator if no block is given.
#
# See the +Find+ module documentation for an example.
#
def find(*paths, ignore_error: true) # :yield: path
block_given? or return enum_for(__method__, *paths, ignore_error: ignore_error)
fs_encoding = Encoding.find("filesystem")
paths.collect!{|d| raise Errno::ENOENT, d unless File.exist?(d); d.dup}.each do |path|
path = path.to_path if path.respond_to? :to_path
enc = path.encoding == Encoding::US_ASCII ? fs_encoding : path.encoding
ps = [path]
while file = ps.shift
catch(:prune) do
yield file.dup.taint
begin
s = File.lstat(file)
rescue Errno::ENOENT, Errno::EACCES, Errno::ENOTDIR, Errno::ELOOP, Errno::ENAMETOOLONG
raise unless ignore_error
next
end
if s.directory? then
begin
fs = Dir.children(file, encoding: enc)
rescue Errno::ENOENT, Errno::EACCES, Errno::ENOTDIR, Errno::ELOOP, Errno::ENAMETOOLONG
raise unless ignore_error
next
end
fs.sort!
fs.reverse_each {|f|
f = File.join(file, f)
ps.unshift f.untaint
}
end
end
end
end
nil
end
#
# Skips the current file or directory, restarting the loop with the next
# entry. If the current file is a directory, that directory will not be
# recursively entered. Meaningful only within the block associated with
# Find::find.
#
# See the +Find+ module documentation for an example.
#
def prune
throw :prune
end
module_function :find, :prune
end
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