#!/bin/sh

# Bzgrep wrapped for bzip2, 

# adapted from zgrep by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

## zgrep notice:

## zgrep -- a wrapper around a grep program that decompresses files as needed

## Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>

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

prog=`echo $0 | sed 's|.*/||'`

case "$prog" in

	*egrep)	grep=${EGREP-egrep}	;;

	*fgrep)	grep=${FGREP-fgrep}	;;

	*)	grep=${GREP-grep}	;;

esac

pat=""

while test $# -ne 0; do

  case "$1" in

  -e | -f) opt="$opt $1"; shift; pat="$1"

           if test "$grep" = grep; then  # grep is buggy with -e on SVR4

             grep=egrep

           fi;;

  -A | -B) opt="$opt $1 $2"; shift;;

  -*)	   opt="$opt $1";;

   *)      if test -z "$pat"; then

	     pat="$1"

	   else

	     break;

           fi;;

  esac

  shift

done

if test -z "$pat"; then

  echo "grep through bzip2 files"

  echo "usage: $prog [grep_options] pattern [files]"

  exit 1

fi

list=0

silent=0

op=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`

case "$op" in

  *l*) list=1

esac

case "$op" in

  *h*) silent=1

esac

if test $# -eq 0; then

  bzip2 -cdfq | $grep $opt "$pat"

  exit $?

fi

res=0

for i do

  if test -f "$i"; then :; else if test -f "$i.bz2"; then i="$i.bz2"; fi; fi

  if test $list -eq 1; then

    bzip2 -cdfq "$i" | $grep $opt "$pat" 2>&1 > /dev/null && echo $i

    r=$?

  elif test $# -eq 1 -o $silent -eq 1; then

    bzip2 -cdfq "$i" | $grep $opt "$pat"

    r=$?

  else

    j=${i//\\/\\\\}

    j=${j//|/\\|}

    j=${j//&/\\&}

    j=`printf "%s" "$j" | tr '\n' ' '`

    bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"

    r=$?

  fi

  test "$r" -ne 0 && res="$r"

done

exit $res