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#!/usr/bin/env python
# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
import os, re, sys
egrep_compat_map = {
"[:alnum:]" : r'\w',
"[:space:]" : r'\s',
}
here_doc_re = re.compile(r'.*\s<<[-]?(\w+)$')
def compile_egrep_pattern(s):
for k, v in egrep_compat_map.iteritems():
s = s.replace(k, v)
return re.compile(s)
def filter_bash_environment(pattern, file_in, file_out):
here_doc_delim = None
for line in file_in:
if here_doc_delim is not None:
if here_doc_delim.match(line):
here_doc_delim = None
file_out.write(line)
continue
here_doc = here_doc_re.match(line)
if here_doc is not None:
here_doc_delim = re.compile("^%s$" % here_doc.group(1))
file_out.write(line)
continue
if pattern.match(line) is None:
file_out.write(line)
if __name__ == "__main__":
description = "Filter out any lines that match a given PATTERN " + \
"while leaving bash here-documents intact. The PATTERN should " + \
"use python regular expression syntax but [:space:] and " + \
"[:alnum:] character classes will be automatically translated " + \
"for compatibility with egrep syntax."
usage = "usage: %s PATTERN" % os.path.basename(sys.argv[0])
from optparse import OptionParser
parser = OptionParser(description=description, usage=usage)
options, args = parser.parse_args(sys.argv[1:])
if len(args) != 1:
parser.error("Missing required PATTERN argument.")
file_in = sys.stdin
file_out = sys.stdout
filter_bash_environment(
compile_egrep_pattern(args[0]), file_in, file_out)
file_out.flush()
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