====== Python Dir Tree Crawling ======
On some system like my [[wp>Linux]]. A Tree command is not provided by default.  I have several choices:

  * the **find** command(no indention by default, need tuning)
  * **[[man>ls]] -R**(ugly by default, needs tuning)
  * a Linux tree command [[http://mama.indstate.edu/users/ice/tree/]]
  * Other [[wp>Perl]]/[[wp>Python]] solution.

==== Python Solution ====
Python provides os.walk() method.
A very simple pure python solution:

<code python>
# -*- coding: utf-8 -*-

import os
path = "."

def printFiles(dirList, spaceCount):
    for file in dirList:
        print "/".rjust(spaceCount+1) + file

def printDirectory(dirEntry):
    print dirEntry[0] + "/"
    printFiles(dirEntry[2], len(dirEntry[0]))

tree = os.walk(path)
for directory in tree:
    printDirectory(directory)
</code>

==== Other Thoughts ====
Hmm... I believe many shell geek have their own tree script. 
Rakes my brain to bring indention so this is a half-way script based on ls -R:
<code bash>
#!/bin/bash
 ls -R | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'
</code>

And for perl, there should be some shinning ones on [[wp>CPAN]].
Guess ppl will use the File::Find module:
<code perl>
#!/usr/bin/perl
use File::Find;
use File::Basename;

@ARGV=qw(.) if not @ARGV;
find(\&do, @ARGV);

sub do {
   $fpath=$File::Find::name;
   $fname=basename($fpath);
   print "$fname $fpath\n";
}
</code>
My perl knowledge is too limited... Have file name and dir name on same line easy for further piping...

Shhh ugly... Too much to learn!

{{tag>python shell cli}}

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~~META:
creator = MeaCulpa
&date created = 2010-01-27
~~

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