filter-bash-environment.py: don't use optparse

diff --git a/bin/filter-bash-environment.py b/bin/filter-bash-environment.py
index b9aec96d0e50c564a6dd68a88ab4e6d91d33c516..3d4b3ecbb1203655326ab286716f2f1f5d652645 100755 (executable)
--- a/bin/filter-bash-environment.py
+++ b/bin/filter-bash-environment.py
@@ -1,10 +1,9 @@
 #!/usr/bin/python
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2013 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 import codecs
 import io
-import optparse
 import os
 import re
 import sys
@@ -126,10 +125,19 @@ if __name__ == "__main__":
                "intact. The PATTERN is a space separated list of variable names" + \
                " and it supports python regular expression syntax."
        usage = "usage: %s PATTERN" % os.path.basename(sys.argv[0])
-       parser = optparse.OptionParser(description=description, usage=usage)
-       options, args = parser.parse_args(sys.argv[1:])
+       args = sys.argv[1:]
+
+       if '-h' in args or '--help' in args:
+               sys.stdout.write(usage + "\n")
+               sys.stdout.flush()
+               sys.exit(os.EX_OK)
+
        if len(args) != 1:
-               parser.error("Missing required PATTERN argument.")
+               sys.stderr.write(usage + "\n")
+               sys.stderr.write("Exactly one PATTERN argument required.\n")
+               sys.stderr.flush()
+               sys.exit(2)
+
        file_in = sys.stdin
        file_out = sys.stdout
        if sys.hexversion >= 0x3000000: