Patch 473512: add GNU style scanning as gnu_getopt.
diff --git a/Lib/getopt.py b/Lib/getopt.py
index 91584fe..3e8b7c2 100644
--- a/Lib/getopt.py
+++ b/Lib/getopt.py
@@ -5,20 +5,36 @@
function (including the special meanings of arguments of the form `-'
and `--'). Long options similar to those supported by GNU software
may be used as well via an optional third argument. This module
-provides a single function and an exception:
+provides two functions and an exception:
getopt() -- Parse command line options
+gnu_getopt() -- Like getopt(), but allow option and non-option arguments
+to be intermixed.
GetoptError -- exception (class) raised with 'opt' attribute, which is the
option involved with the exception.
"""
# Long option support added by Lars Wirzenius <liw@iki.fi>.
-
+#
# Gerrit Holl <gerrit@nl.linux.org> moved the string-based exceptions
# to class-based exceptions.
+#
+# Peter Åstrand <astrand@lysator.liu.se> added gnu_getopt().
+#
+# TODO for gnu_getopt():
+#
+# - GNU getopt_long_only mechanism
+# - allow the caller to specify ordering
+# - RETURN_IN_ORDER option
+# - GNU extension with '-' as first character of option string
+# - optional arguments, specified by double colons
+# - a option string with a W followed by semicolon should
+# treat "-W foo" as "--foo"
__all__ = ["GetoptError","error","getopt"]
+import os
+
class GetoptError(Exception):
opt = ''
msg = ''
@@ -75,6 +91,56 @@
return opts, args
+def gnu_getopt(args, shortopts, longopts = []):
+ """getopt(args, options[, long_options]) -> opts, args
+
+ This function works like getopt(), except that GNU style scanning
+ mode is used by default. This means that option and non-option
+ arguments may be intermixed. The getopt() function stops
+ processing options as soon as a non-option argument is
+ encountered.
+
+ If the first character of the option string is `+', or if the
+ environment variable POSIXLY_CORRECT is set, then option
+ processing stops as soon as a non-option argument is encountered.
+
+ """
+
+ opts = []
+ prog_args = []
+ if type(longopts) == type(""):
+ longopts = [longopts]
+ else:
+ longopts = list(longopts)
+
+ # Allow options after non-option arguments?
+ if shortopts.startswith('+'):
+ shortopts = shortopts[1:]
+ all_options_first = 1
+ elif os.getenv("POSIXLY_CORRECT"):
+ all_options_first = 1
+ else:
+ all_options_first = 0
+
+ while args:
+ if args[0] == '--':
+ prog_args += args[1:]
+ break
+
+ if args[0][:2] == '--':
+ opts, args = do_longs(opts, args[0][2:], longopts, args[1:])
+ elif args[0][:1] == '-':
+ opts, args = do_shorts(opts, args[0][1:], shortopts, args[1:])
+ else:
+ if all_options_first:
+ prog_args += args
+ break
+ else:
+ prog_args.append(args[0])
+ args = args[1:]
+
+ return opts, prog_args
+
def do_longs(opts, opt, longopts, args):
try:
i = opt.index('=')
diff --git a/Lib/test/test_getopt.py b/Lib/test/test_getopt.py
index f8989f1..e2ae9fe 100644
--- a/Lib/test/test_getopt.py
+++ b/Lib/test/test_getopt.py
@@ -4,6 +4,7 @@
import getopt
from getopt import GetoptError
from test_support import verify, verbose
+import os
def expectException(teststr, expected, failure=AssertionError):
"""Executes a statement passed in teststr, and raises an exception
@@ -106,5 +107,24 @@
"opts, args = getopt.getopt(cmdline, 'a:b', ['alpha', 'beta'])",
GetoptError)
+# Test handling of GNU style scanning mode.
+if verbose:
+ print 'Running tests on getopt.gnu_getopt'
+cmdline = ['-a', 'arg1', '-b', '1', '--alpha', '--beta=2']
+# GNU style
+opts, args = getopt.gnu_getopt(cmdline, 'ab:', ['alpha', 'beta='])
+verify(opts == [('-a', ''), ('-b', '1'), ('--alpha', ''), ('--beta', '2')])
+verify(args == ['arg1'])
+# Posix style via +
+opts, args = getopt.gnu_getopt(cmdline, '+ab:', ['alpha', 'beta='])
+verify(opts == [('-a', '')])
+verify(args == ['arg1', '-b', '1', '--alpha', '--beta=2'])
+# Posix style via POSIXLY_CORRECT
+os.environ["POSIXLY_CORRECT"] = "1"
+opts, args = getopt.gnu_getopt(cmdline, 'ab:', ['alpha', 'beta='])
+verify(opts == [('-a', '')])
+verify(args == ['arg1', '-b', '1', '--alpha', '--beta=2'])
+
+
if verbose:
print "Module getopt: tests completed successfully."