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# Copyright (C) 2008 Canonical Ltd
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Miscellaneous useful stuff."""
def single_plural(n, single, plural):
"""Return a single or plural form of a noun based on number."""
if n == 1:
return single
else:
return plural
def defines_to_dict(defines):
"""Convert a list of definition strings to a dictionary."""
if defines is None:
return None
result = {}
for define in defines:
kv = define.split('=', 1)
if len(kv) == 1:
result[define.strip()] = 1
else:
result[kv[0].strip()] = kv[1].strip()
return result
def invert_dict(d):
"""Invert a dictionary with keys matching each value turned into a list."""
# Based on recipe from ASPN
result = {}
for k, v in d.iteritems():
keys = result.setdefault(v, [])
keys.append(k)
return result
def invert_dictset(d):
"""Invert a dictionary with keys matching a set of values, turned into lists."""
# Based on recipe from ASPN
result = {}
for k, c in d.iteritems():
for v in c:
keys = result.setdefault(v, [])
keys.append(k)
return result
def _common_path_and_rest(l1, l2, common=[]):
# From http://code.activestate.com/recipes/208993/
if len(l1) < 1: return (common, l1, l2)
if len(l2) < 1: return (common, l1, l2)
if l1[0] != l2[0]: return (common, l1, l2)
return _common_path_and_rest(l1[1:], l2[1:], common+[l1[0]])
def common_path(path1, path2):
"""Find the common bit of 2 paths."""
return ''.join(_common_path_and_rest(path1, path2)[0])
def binary_stream(stream):
"""Ensure a stream is binary on Windows.
:return: the stream
"""
try:
import os
if os.name == 'nt':
fileno = getattr(stream, 'fileno', None)
if fileno:
no = fileno()
if no >= 0: # -1 means we're working as subprocess
import msvcrt
msvcrt.setmode(no, os.O_BINARY)
except ImportError:
pass
return stream
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