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"""File wrangling."""
import os, sys
class FileLocator:
"""Understand how filenames work."""
def __init__(self):
self.relative_dir = self.abs_file(os.curdir) + os.sep
# Cache of results of calling the canonical_filename() method, to
# avoid duplicating work.
self.canonical_filename_cache = {}
def abs_file(self, filename):
"""Return the absolute normalized form of `filename`."""
return os.path.normcase(os.path.abspath(os.path.realpath(filename)))
def relative_filename(self, filename):
"""Return the relative form of `filename`.
The filename will be relative to the current directory when the
FileLocator was constructed.
"""
return filename.replace(self.relative_dir, "")
def canonical_filename(self, filename):
"""Return a canonical filename for `filename`.
An absolute path with no redundant components and normalized case.
"""
if filename not in self.canonical_filename_cache:
f = filename
if os.path.isabs(f) and not os.path.exists(f):
if self.get_zip_data(f) is None:
f = os.path.basename(f)
if not os.path.isabs(f):
for path in [os.curdir] + sys.path:
g = os.path.join(path, f)
if os.path.exists(g):
f = g
break
cf = self.abs_file(f)
self.canonical_filename_cache[filename] = cf
return self.canonical_filename_cache[filename]
def get_zip_data(self, filename):
"""Get data from `filename` if it is a zip file path.
Returns the data read from the zip file, or None if no zip file could
be found or `filename` isn't in it. The data returned might be "" if
the file is empty.
"""
import zipimport
markers = ['.zip'+os.sep, '.egg'+os.sep]
for marker in markers:
if marker in filename:
parts = filename.split(marker)
try:
zi = zipimport.zipimporter(parts[0]+marker[:-1])
except zipimport.ZipImportError:
continue
try:
data = zi.get_data(parts[1])
except IOError:
continue
return data
return None
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