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# Copyright (C) 2009, 2010, 2011 Roman Zimbelmann <romanz@lavabit.com>
#
# 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/>.
"""
Functions to escape metacharacters of arguments for shell commands.
"""
META_CHARS = (' ', "'", '"', '`', '&', '|', ';',
'$', '!', '(', ')', '[', ']', '<', '>')
META_DICT = dict([(mc, '\\' + mc) for mc in META_CHARS])
def shell_quote(string):
"""Escapes by quoting"""
return "'" + str(string).replace("'", "'\\''") + "'"
def shell_escape(arg):
"""Escapes by adding backslashes"""
arg = str(arg)
arg = arg.replace('\\', '\\\\') # make sure this comes at the start
for k, v in META_DICT.items():
arg = arg.replace(k, v)
return arg
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