#!/bin/sh
#
# Copyright (c) 2003 Thomas Klausner.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# $FreeBSD$
set -u
grep=grep
zcat=zstdcat
endofopts=0
pattern_file=0
pattern_found=0
grep_args=""
hyphen=0
silent=0
prg=${0##*/}
# handle being called 'zegrep' or 'zfgrep'
case ${prg} in
*egrep)
grep_args="-E";;
*fgrep)
grep_args="-F";;
esac
catargs="-f"
case ${prg} in
zstd*)
cattool="/usr/bin/zstdcat"
catargs="-fq"
;;
bz*)
cattool="/usr/bin/bzcat"
;;
z*)
cattool="/usr/bin/zcat"
;;
xz*)
cattool="/usr/bin/xzcat"
;;
lz*)
cattool="/usr/bin/lzcat"
;;
*)
echo "Invalid command: ${prg}" >&2
exit 1
;;
esac
# skip all options and pass them on to grep taking care of options
# with arguments, and if -e was supplied
while [ $# -gt 0 -a ${endofopts} -eq 0 ]
do
case $1 in
# from GNU grep-2.5.1 -- keep in sync!
--)
shift
endofopts=1
;;
--file=*)
pattern_file=1
grep_args="${grep_args} ${1}"
shift
;;
--regexp=*)
pattern="${1#--regexp=}"
pattern_found=1
shift
;;
-h|--no-filename)
silent=1
shift
;;
-V|--version)
exec ${grep} -V
;;
--*)
grep_args="${grep_args} $1"
shift
;;
-*[ABCDXdefm])
if [ $# -lt 2 ]
then
echo "${prg}: missing argument for $1 flag" >&2
exit 1
fi
case $1 in
-*e)
pattern="$2"
pattern_found=1
shift 2
continue
;;
-*f)
pattern_file=1
;;
*)
;;
esac
grep_args="${grep_args} $1 $2"
shift 2
;;
-)
hyphen=1
shift
;;
-r|-R)
echo "${prg}: the ${1} flag is not currently supported" >&2
exit 1
;;
-*)
grep_args="${grep_args} $1"
shift
;;
*)
# pattern to grep for
endofopts=1
;;
esac
done
# if no -e option was found, take next argument as grep-pattern
if [ ${pattern_file} -eq 0 -a ${pattern_found} -eq 0 ]
then
if [ $# -ge 1 ]; then
pattern="$1"
shift
elif [ ${hyphen} -gt 0 ]; then
pattern="-"
else
echo "${prg}: missing pattern" >&2
exit 1
fi
pattern_found=1
fi
# call grep ...
if [ $# -lt 1 ]
then
# ... on stdin
if [ ${pattern_file} -eq 0 ]; then
${cattool} ${catargs} - | ${grep} ${grep_args} -- "${pattern}" -
else
${cattool} ${catargs} - | ${grep} ${grep_args} -- -
fi
ret=$?
else
# ... on all files given on the command line
if [ ${silent} -lt 1 -a $# -gt 1 ]; then
grep_args="-H ${grep_args}"
fi
# Succeed if any file matches. First assume no match.
ret=1
for file; do
if [ ${pattern_file} -eq 0 ]; then
${cattool} ${catargs} -- "${file}" |
${grep} --label="${file}" ${grep_args} -- "${pattern}" -
else
${cattool} ${catargs} -- "${file}" |
${grep} --label="${file}" ${grep_args} -- -
fi
this_ret=$?
# A match (0) overrides a no-match (1). An error (>=2) overrides all.
if [ ${this_ret} -eq 0 -a ${ret} -eq 1 ] || [ ${this_ret} -ge 2 ]; then
ret=${this_ret}
fi
done
fi
exit ${ret}
