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# Copyright (C) 2008, 2009, 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Rule-based definition of preferences for selected files in selected branches.
See ``bzr help rules`` for details.
"""
from __future__ import absolute_import
from bzrlib import (
config,
cmdline,
errors,
globbing,
osutils,
)
from bzrlib.util.configobj import configobj
# Name of the file holding rules in a tree
RULES_TREE_FILENAME = ".bzrrules"
# Namespace prefix for per file preferences
FILE_PREFS_PREFIX = 'name '
FILE_PREFS_PREFIX_LEN = len(FILE_PREFS_PREFIX)
# The object providing default rules
_per_user_searcher = None
class _RulesSearcher(object):
"""An object that provides rule-based preferences."""
def get_items(self, path):
"""Return the preferences for a path as name,value tuples.
:param path: tree relative path
:return: () if no rule matched, otherwise a sequence of name,value
tuples.
"""
raise NotImplementedError(self.get_items)
def get_selected_items(self, path, names):
"""Return selected preferences for a path as name,value tuples.
:param path: tree relative path
:param names: the list of preferences to lookup
:return: () if no rule matched, otherwise a sequence of name,value
tuples. The sequence is the same length as names,
tuple order matches the order in names, and
undefined preferences are given the value None.
"""
raise NotImplementedError(self.get_selected_items)
def get_single_value(self, path, preference_name):
"""Get a single preference for a single file.
:returns: The string preference value, or None.
"""
for key, value in self.get_selected_items(path, [preference_name]):
return value
return None
class _IniBasedRulesSearcher(_RulesSearcher):
def __init__(self, inifile):
"""Construct a _RulesSearcher based on an ini file.
The content will be decoded as utf-8.
:param inifile: the name of the file or a sequence of lines.
"""
self._cfg = configobj.ConfigObj(inifile, encoding='utf-8')
sections = self._cfg.keys()
patterns = []
self.pattern_to_section = {}
for s in sections:
if s.startswith(FILE_PREFS_PREFIX):
file_patterns = cmdline.split(s[FILE_PREFS_PREFIX_LEN:])
patterns.extend(file_patterns)
for fp in file_patterns:
self.pattern_to_section[fp] = s
if len(patterns) < len(sections):
unknowns = [s for s in sections
if not s.startswith(FILE_PREFS_PREFIX)]
raise errors.UnknownRules(unknowns)
elif patterns:
self._globster = globbing._OrderedGlobster(patterns)
else:
self._globster = None
def get_items(self, path):
"""See _RulesSearcher.get_items."""
if self._globster is None:
return ()
pat = self._globster.match(path)
if pat is None:
return ()
else:
all = self._cfg[self.pattern_to_section[pat]]
return tuple(all.items())
def get_selected_items(self, path, names):
"""See _RulesSearcher.get_selected_items."""
if self._globster is None:
return ()
pat = self._globster.match(path)
if pat is None:
return ()
else:
all = self._cfg[self.pattern_to_section[pat]]
return tuple((k, all.get(k)) for k in names)
class _StackedRulesSearcher(_RulesSearcher):
def __init__(self, searchers):
"""Construct a _RulesSearcher based on a stack of other ones.
:param searchers: a sequence of searchers.
"""
self.searchers = searchers
def get_items(self, path):
"""See _RulesSearcher.get_items."""
for searcher in self.searchers:
result = searcher.get_items(path)
if result:
return result
return ()
def get_selected_items(self, path, names):
"""See _RulesSearcher.get_selected_items."""
for searcher in self.searchers:
result = searcher.get_selected_items(path, names)
if result:
return result
return ()
def rules_filename():
"""Return the default rules filename."""
return osutils.pathjoin(config.config_dir(), 'rules')
def reset_rules():
global _per_user_searcher
_per_user_searcher = _IniBasedRulesSearcher(rules_filename())
reset_rules()
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