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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2011 - 2014 by Wilbert Berendsen
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
"""
Utility functions used in the autocomplete package.
"""
import functools
import time
import weakref
def keep(f):
"""Returns a decorator that remembers its return value for some time."""
_delay = 5.0 # sec
_cache = weakref.WeakKeyDictionary()
@functools.wraps(f)
def decorator(self, *args):
try:
result = _cache[self]
except KeyError:
pass
else:
t, ret = result
if (time.time() - t) < _delay:
return ret
ret = f(self, *args)
_cache[self] = (time.time(), ret)
return ret
return decorator
# helper functions for displaying data from models
def command(item):
"""Prepends '\\' to item."""
return '\\' + item
def variable(item):
"""Appends ' = ' to item."""
return item + " = "
def cmd_or_var(item):
"""Appends ' = ' to item if it does not start with '\\'."""
return item if item.startswith('\\') else item + " = "
def make_cmds(words):
"""Returns generator prepending '\\' to every word."""
return ('\\' + w for w in words)
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