python file finder

findfile.py

import os
import glob
import errno
try:
  from itertools import ifilter as filter
except ImportError:
  pass

def findfile(filepath, find_all, search_path='', recursive=False, allowglob=False, rel_path='.', follow_links=False):
    filelist = []

    # first expand user; we want user relative paths to be considered
    # same as absolute paths
    filepath = os.path.expanduser(filepath)

    # For absolute paths, add any existing matches
    if os.path.isabs(filepath):
        if allowglob:
            filelist.extend(glob.iglob(filepath))
        else:
            filelist.append(filepath)            
    # This is an 'explicity' relative path, consider it relative to rel_path
    elif os.path.dirname(filepath) != '':
        filepath = os.path.join(os.path.abspath(rel_path), filepath)
        if allowglob:
            filelist.extend(glob.iglob(filepath))
        else:
            filelist.append(filepath)
    # This has no explicit relative path component, so we can search
    # for this on the search_path
    elif search_path:
        for pathcmp in search_path.split(os.path.pathsep):
            for root, dirs, files in os.walk(pathcmp, followlinks=follow_links):
                root = os.path.abspath(root)
                if allowglob:
                    filelist.extend(glob.iglob(os.path.join(root, filepath)))
                else:
                    pathmatch = os.path.join(root, filepath)
                    if not find_all and os.path.isfile(pathmatch):
                        return pathmatch # for speed's sake, return here
                    filelist.append(pathmatch)
                if not recursive: break

    # filter out non-existent and non-file matches
    filelist = list(filter(os.path.isfile, filelist))

    # For convenience, we have the somewhat odd behavior that when
    # searching for a single match (find_all=False) we raise an error
    # when no match is found. OTOH, we stay silent if we're returning
    # a list of matches
    if not (find_all or filelist):
        raise IOError(errno.ENOENT, "No match found for expression: '%s'" % filepath)

    return filelist if find_all else filelist[0]

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