#!/bin/sh
# (c) Wolfram Schneider, Berlin. April 1996.
#
# zgrep -  search possibly compressed files for a regular expression
#
# $Id: zgrep,v 1.4 1996/04/28 18:43:47 wosch Exp $


PATH=/bin:/usr/bin:$PATH; export PATH

# grep variant
case "$0" in
	*egrep)	grep=${EGREP-egrep}	;;
	*fgrep)	grep=${FGREP-fgrep}	;;
	*)	grep=${GREP-grep}	;;
esac

gzip=gzip gzipopt="-cdfq" pattern= grepopt= files= line= header=
set -- `getopt "0123456789A:B:CEFGVX:bce:f:hiLlnqsvwxy" "$@"`

# check options
while :
do
	case "$1" in
		--) 	shift; break;;			# EOF options
		-e|-f) 	pattern="$1 $2"; shift;;	# -f file
		-l|-L) 	line=$1; 	grepopt="$grepopt $1";;
		-h|-q) 	header=$1; 	grepopt="$grepopt $1";;
  		*) 			grepopt="$grepopt $1";;	# rest
	esac
	shift
done

# check pattern
case X"$pattern" in
	X) case $# in 
		0) echo "usage: $0 [grep_options] pattern [files]"; exit 1;; 
		*) pattern=$1; shift;;
	   esac
esac


files="$@"	
# no shell loop neccessary for option -q or -h 
# and a single file or reading from stdin
case "$header"X"$#" in 
	-h*|-q*|X0|X1) 	$gzip $gzipopt $files | $grep $grepopt $pattern
			exit $?;; 
esac


exit=1
for f in $files
do
	case "$line" in
		-l|-L) 	if $gzip $gzipopt $f | 
				$grep $grepopt $pattern >/dev/null
			then
				echo $f
			fi
			;;
		*) $gzip $gzipopt $f | $grep $grepopt $pattern | 
			sed "s%^%${f}:%";;
	esac

	case $? in 
		2) exit=$?;; 
		0) case "$exit" in 2);; 1) exit=0;; esac;;
	esac
done

exit $exit