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#! /usr/bin/env elixir

# https://rosettacode.org/wiki/Walk_a_directory/Recursively

# =============================================================================

# Create

# name  : Andre Rikkert de Koe          date:	Mar 2018 

# descr : filefind

#         This is a demo of programming in the Elixir language.

#         Its part of a project to implement a program to create a directory

#         tree similar to the output of the Unix find program.

# EUID  : Any user who has read access to all the files being searched for.

# run   : interactive

#

# Changes

# name  :                               date:

# descr : short description

#

# =============================================================================

# =============================================================================

# Functions

# =============================================================================

defmodule DezeModule do

	def usage(progname, mesg) do

		IO.puts "Usage: " <> progname <> " filefind" 

		IO.puts mesg	

	end

	def traverse(directory) do

		curdir = System.cwd()

		File.cd!(directory)

		curdir2 = System.cwd()

		files = File.ls!(directory)

		for file <- files do

			pfile = curdir2 <> "/" <> file

			IO.puts pfile

			if File.dir?(pfile) do

				traverse(pfile)

			end

		end

		File.cd!(curdir)

	end

	def start_traverse(directory) do

		IO.puts directory

		traverse(directory)

	end

end

# =============================================================================

# Main

# =============================================================================

progname = System.cwd()

if length(System.argv) == 1 do

	directory = Enum.at(System.argv(), 0)

	if File.dir?(directory)

	do

		DezeModule.start_traverse(directory)

	else

		DezeModule.usage(progname, "ERROR: Not a directory : " <> directory)

	end

else

	DezeModule.usage(progname, "ERROR: 1 argument expected")

end