recursing glob

[Grant Griffin]

Fredrik Lundh wrote:
> 
> Grant Griffin wrote:
> > Somehow I never am happy with  stuff I do with os.walk--is it
> > just me?
> 
> no.

In retrospect, I think os.walk would be a lot friendlier if it passed
two arguments to its function instead of one.  (When I first began with
Python, I didn't realize that that "one" argument could be a list or a
tuple.)

> 
> > Anyway, does anybody have any ideas on how to recurse glob
> > more elegantly?
> 
> define "more elegantly" ;-)
> 
> the following involves more library code, but is much
> easier to use.
> 
> (reposted)
> 
> From: "Fredrik Lundh" <effbot at telia.com>
> Subject: Re: glob
> Date: Wed, 10 May 2000 09:35:43 +0200
> 
> > Is there a recursive glob?
> 
> no, but you can easily roll your own using os.path.walk
> and the fnmatch module.
> 
> or you can use this iterator class, adapted from an example
> in the eff-bot library guide (see below):
> 
> #
> # adapted from os-path-walk-example-3.py
> 
> import os
> import fnmatch
> 
> class GlobDirectoryWalker:
>     # a forward iterator that traverses a directory tree
> 
>     def __init__(self, directory, pattern="*"):
>         self.stack = [directory]
>         self.pattern = pattern
>         self.files = []
>         self.index = 0
> 
>     def __getitem__(self, index):
>         while 1:
>             try:
>                 file = self.files[self.index]
>                 self.index = self.index + 1
>             except IndexError:
>                 # pop next directory from stack
>                 self.directory = self.stack.pop()
>                 self.files = os.listdir(self.directory)
>                 self.index = 0
>             else:
>                 # got a filename
>                 fullname = os.path.join(self.directory, file)
>                 if os.path.isdir(fullname) and not os.path.islink(fullname):
>                     self.stack.append(fullname)
>                 if fnmatch.fnmatch(file, self.pattern):
>                     return fullname
> 
> for file in GlobDirectoryWalker(".", "*.py"):
>     print file

Cool!  Thanks.

I think that's definitely more elegant than what I did:

    def glob_recurse(args, dirname, names):
        """ args[0] = pattern, args[1] = file list """
        args[1] += glob.glob(os.path.join(dirname, args[0]))

and then:

    os.path.walk('.', glob_recurse, [pattern, file_names])

I think this would have been pretty easy for a more seasoned Pythoneer
to cough up, but it took me awhile.  In particular, I tried to pass it a
tuple at first, and it took me awhile to figure out the source of the
error message.

we-horses-don't-always-drink-the-water-we're-lead-to-if-it's-not
   -clearly-labeled-as-such-<wink>-ly y'rs,

=g2
-- 
_____________________________________________________________________

Grant R. Griffin                                       g2 at dspguru.com
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