def arg_split(s, posix=False, strict=True):
"""Split a command line's arguments in a shell-like manner.
This is a modified version of the standard library's shlex.split()
function, but with a default of posix=False for splitting, so that quotes
in inputs are respected.
if strict=False, then any errors shlex.split would raise will result in the
unparsed remainder being the last element of the list, rather than raising.
This is because we sometimes use arg_split to parse things other than
command-line args.
"""
lex = shlex.shlex(s, posix=posix)
lex.whitespace_split = True
# Extract tokens, ensuring that things like leaving open quotes
# does not cause this to raise. This is important, because we
# sometimes pass Python source through this (e.g. %timeit f(" ")),
# and it shouldn't raise an exception.
# It may be a bad idea to parse things that are not command-line args
# through this function, but we do, so let's be safe about it.
lex.commenters='' #fix for GH-1269
tokens = []
while True:
try:
tokens.append(next(lex))
except StopIteration:
break
except ValueError:
if strict:
raise
# couldn't parse, get remaining blob as last token
tokens.append(lex.token)
break
return tokens
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