Nick Craig-Wood <n...@craig-wood.com> wrote:
> Jean-Paul Calderone <exar...@divmod.com> wrote:
> > On Mon, 15 Jun 2009 09:29:33 -0500, Nick Craig-Wood <n...@craig-wood.com>
> > wrote:
> > >Hrvoje Niksic <hnik...@xemacs.org> wrote:
> > >> Nick Craig-Wood <n...@craig-wood.com> writes:
> > >>
> > >> > Here is a ctypes generator listdir for unix-like OSes.
> > >>
> > >> ctypes code scares me with its duplication of the contents of system
> > >> headers. I understand its use as a proof of concept, or for hacks one
> > >> needs right now, but can anyone seriously propose using this kind of
> > >> code in a Python program? For example, this seems much more
> > >> "Linux-only", or possibly even "32-bit-Linux-only", than
> > >> "unix-like":
> > >
> > >It was a proof of concept certainly..
Just in case anyone is interested here is an implementation using cython.
Compile with python setup.py build_ext --inplace
And run listdir.py
This would have been much easier if cython supported yield, but
unfortunately it doesn't (yet - I think it is in the works).
This really should work on any platform!
--setup.py----------------------------------------------------------
from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
setup(
cmdclass = {'build_ext': build_ext},
ext_modules = [Extension("directory", ["directory.pyx"])]
)
--directory.pyx----------------------------------------------------------
# Cython interface for listdir
# python setup.py build_ext --inplace
import cython
cdef extern from "dirent.h":
struct dirent:
char d_name[0]
struct dir_handle:
pass
ctypedef dir_handle DIR "DIR"
DIR *opendir(char *name)
int closedir(DIR *dirp)
dirent *readdir(DIR *dirp)
cdef class Directory:
"""Represents an open directory"""
cdef DIR *handle
def __init__(self, path):
self.handle = opendir(path)
def readdir(self):
cdef dirent *p
p = readdir(self.handle)
if p is NULL:
return None
return p.d_name
def close(self):
closedir(self.handle)
--listdir.py----------------------------------------------------------
from directory import Directory
def listdir(path):
"""
A generator to return the names of files in the directory passed
in
"""
d = Directory(".")
while True:
name = d.readdir()
if not name:
break
if name not in (".", ".."):
yield name
d.close()
if __name__ == "__main__":
for name in listdir("."):
print name
------------------------------------------------------------
--
Nick Craig-Wood <n...@craig-wood.com> -- http://www.craig-wood.com/nick
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