# HG changeset patch
# User Andreas Nolda <andreas@nolda.org>
# Date 1624604745 -7200
#      Fri Jun 25 09:05:45 2021 +0200
# Node ID 64e06afc3be2348d278b24c32e5e837c4e051403
# Parent  a652e8481e86afdc3afaaf1ac2649fbedd953b75
simplify argument parser

diff --git a/xgrep.py b/xgrep.py
--- a/xgrep.py
+++ b/xgrep.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # xgrep.py -- search for elements in XML files, using XPath 1.0 expressions
-# Andreas Nolda 2020-04-26
+# Andreas Nolda 2021-06-25
 
 import sys
 import argparse
@@ -8,7 +8,7 @@
 from blessings import Terminal
 from lxml import etree
 
-version=2.9
+version = 2.9
 
 parser = argparse.ArgumentParser()
 parser.add_argument("expr",
@@ -37,7 +37,7 @@
                     help="declare namespaces in matches")
 parser.add_argument("-q", "--quiet", action="store_true",
                     help="only return exit status")
-parser.add_argument("-r", "--regex", metavar="ns", nargs=1,
+parser.add_argument("-r", "--regex", metavar="ns",
                     help="namespace prefix for EXSLT regular expressions")
 parser.add_argument("-v", "--version", action="version",
                     version="{0} {1}".format(parser.prog, version))
@@ -180,7 +180,7 @@
             nsexpr = insert_default_ns(args.expr, nsmap)
             # add regexp namespace *after* inserting default namespace
             if args.regex:
-                nsmap[args.regex[0]] = "http://exslt.org/regular-expressions"
+                nsmap[args.regex] = "http://exslt.org/regular-expressions"
             matches = tree.xpath(nsexpr, namespaces=nsmap)
             if not args.quiet:
                 if args.files_without_match: