# frozen_string_literal: true

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#

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# find.rb: the Find module for processing all files under a given directory.

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#

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#

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# The +Find+ module supports the top-down traversal of a set of file paths.

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#

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# For example, to total the size of all files under your home directory,

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# ignoring anything in a "dot" directory (e.g. $HOME/.ssh):

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#

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# require 'find'

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#

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# total_size = 0

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#

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# Find.find(ENV["HOME"]) do |path|

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# if FileTest.directory?(path)

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# if File.basename(path)[0] == ?.

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# Find.prune # Don't look any further into this directory.

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# else

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# next

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# end

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# else

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# total_size += FileTest.size(path)

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# end

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# end

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#

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module Find

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#

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# Calls the associated block with the name of every file and directory listed

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# as arguments, then recursively on their subdirectories, and so on.

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#

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# Returns an enumerator if no block is given.

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#

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# See the +Find+ module documentation for an example.

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#

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def find(*paths, ignore_error: true) # :yield: path

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block_given? or return enum_for(__method__, *paths, ignore_error: ignore_error)

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fs_encoding = Encoding.find("filesystem")

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paths.collect!{|d| raise Errno::ENOENT, d unless File.exist?(d); d.dup}.each do |path|

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path = path.to_path if path.respond_to? :to_path

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enc = path.encoding == Encoding::US_ASCII ? fs_encoding : path.encoding

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ps = [path]

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while file = ps.shift

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catch(:prune) do

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yield file.dup.taint

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begin

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s = File.lstat(file)

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rescue Errno::ENOENT, Errno::EACCES, Errno::ENOTDIR, Errno::ELOOP, Errno::ENAMETOOLONG

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raise unless ignore_error

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next

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end

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if s.directory? then

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begin

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fs = Dir.children(file, encoding: enc)

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rescue Errno::ENOENT, Errno::EACCES, Errno::ENOTDIR, Errno::ELOOP, Errno::ENAMETOOLONG

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raise unless ignore_error

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next

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end

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fs.sort!

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fs.reverse_each {|f|

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f = File.join(file, f)

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ps.unshift f.untaint

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}

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end

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end

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end

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end

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nil

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end

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#

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# Skips the current file or directory, restarting the loop with the next

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# entry. If the current file is a directory, that directory will not be

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# recursively entered. Meaningful only within the block associated with

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# Find::find.

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#

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# See the +Find+ module documentation for an example.

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#

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def prune

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throw :prune

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end

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module_function :find, :prune

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end

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