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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