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fs.py
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fs.py
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# -*- coding: utf-8 -*-
# <Lettuce - Behaviour Driven Development for python>
# Copyright (C) <2010> Gabriel Falcão <gabriel@nacaolivre.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import os
import imp
import sys
import codecs
import fnmatch
import zipfile
from glob import glob
from os.path import abspath, join, dirname, curdir, exists
class FeatureLoader(object):
"""Loader class responsible for findind features and step
definitions along a given path on filesystem"""
def __init__(self, base_dir):
self.base_dir = FileSystem.abspath(base_dir)
def find_and_load_step_definitions(self):
files = FileSystem.locate(self.base_dir, '*.py')
for filename in files:
root = FileSystem.dirname(filename)
sys.path.insert(0, root)
to_load = FileSystem.filename(filename, with_extension=False)
module = __import__(to_load)
reload(module) # always take fresh meat :)
sys.path.remove(root)
def find_feature_files(self):
paths = FileSystem.locate(self.base_dir, "*.feature")
return paths
class FileSystem(object):
"""File system abstraction, mainly used for indirection, so that
lettuce can be well unit-tested :)
"""
stack = []
def __init__(self):
self.stack = []
@classmethod
def _import(cls, name):
sys.path.insert(0, cls.current_dir())
fp, pathname, description = imp.find_module(name)
try:
module = imp.load_module(name, fp, pathname, description)
sys.path.remove(cls.current_dir())
return module
finally:
# Since we may exit via an exception, close fp explicitly.
if fp:
fp.close()
@classmethod
def pushd(cls, *path):
"""Change current dir to `path`, adding it to a stack. Can be
undone by calling FileSystem.popd()"""
path = cls.join(*path)
if not len(cls.stack):
cls.stack.append(cls.current_dir())
cls.stack.append(path)
os.chdir(path)
@classmethod
def popd(cls):
"""Go back one path in path stack"""
if cls.stack:
cls.stack.pop()
if cls.stack:
os.chdir(cls.stack[-1])
@classmethod
def filename(cls, path, with_extension=True):
"""Returns only the filename from a full path. If the argument
with_extension is False, return the filename without
extension.
Examples::
>>> from lettuce.fs import FileSystem
>>> assert FileSystem.filename('/full/path/to/some_file.py') == 'some_file.py'
>>> assert FileSystem.filename('/full/path/to/some_file.py', False) == 'some_file'
"""
fname = os.path.split(path)[1]
if not with_extension:
fname = os.path.splitext(fname)[0]
return fname
@classmethod
def exists(cls, path):
"""Return True if `path`exists"""
return exists(path)
@classmethod
def mkdir(cls, path):
"""Create paths recursively, ignore already created dirs
Example:
>>> from lettuce.fs import FileSystem
>>> FileSystem.mkdir('~/a/lot/of/nested/dirs')
"""
try:
os.makedirs(path)
except OSError, e:
# ignore if path already exists
if e.errno not in (17, ):
raise e
else:
if not os.path.isdir(path):
# but the path must be a dir to ignore its creation
raise e
@classmethod
def current_dir(cls, path=""):
'''Returns the absolute path for current dir, also join the
current path with the given, if so.'''
to_return = cls.abspath(curdir)
if path:
return cls.join(to_return, path)
return to_return
@classmethod
def abspath(cls, path):
'''Returns the absolute path for the given path.'''
return abspath(path)
@classmethod
def relpath(cls, path):
'''Returns the absolute path for the given path.'''
current_path = cls.current_dir()
absolute_path = cls.abspath(path)
return re.sub("^" + re.escape(current_path), '', absolute_path).lstrip("/")
@classmethod
def join(cls, *args):
'''Returns the concatenated path for the given arguments.'''
return join(*args)
@classmethod
def dirname(cls, path):
'''Returns the directory name for the given file.'''
return cls.abspath(dirname(path))
@classmethod
def walk(cls, path):
'''Walks through filesystem'''
return os.walk(path)
@classmethod
def locate(cls, path, match, recursive=True):
"""Locate files recursively in a given path"""
root_path = cls.abspath(path)
if recursive:
return_files = []
for path, dirs, files in cls.walk(root_path):
for filename in fnmatch.filter(files, match):
return_files.append(cls.join(path, filename))
return return_files
else:
return glob(cls.join(root_path, match))
@classmethod
def extract_zip(cls, filename, base_path='.', verbose=False):
"""Extracts a zip file into `base_path`"""
base_path = cls.abspath(base_path)
output = lambda x: verbose and sys.stdout.write("%s\n" % x)
cls.pushd(base_path)
zfile = zipfile.ZipFile(filename)
output("Extracting files to %s" % base_path)
for file_name in zfile.namelist():
try:
output(" -> Unpacking %s" % file_name)
f = cls.open_raw(file_name, 'w')
f.write(zfile.read(file_name))
f.close()
except IOError:
output("---> Creating directory %s" % file_name)
cls.mkdir(file_name)
cls.popd()
@classmethod
def open(cls, name, mode):
"""Opens a file as utf-8"""
path = name
if not os.path.isabs(path):
path = cls.current_dir(name)
return codecs.open(path, mode, 'utf-8')
@classmethod
def open_raw(cls, name, mode):
"""Opens a file without specifying encoding"""
path = name
if not os.path.isabs(path):
path = cls.current_dir(name)
return open(path, mode)