source: trunk/minix/commands/bzip2-1.0.3/bzgrep@ 10

#!/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=$?
  else
    bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${i}:|"
    r=$?
  fi
  test "$r" -ne 0 && res="$r"
done
exit $res