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#!/bin/sh

# zgrep -- a wrapper around a grep program that decompresses files as needed
# Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>

# Copyright (C) 1998, 2001, 2002, 2006, 2007 Free Software Foundation
# Copyright (C) 1993 Jean-loup Gailly

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

PATH=${GZIP_BINDIR-'/bin'}:$PATH
grep='${GREP-grep}'
args=

version='zgrep (gzip) 1.3.12
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.

Written by Jean-loup Gailly.'

usage="Usage: $0 [OPTION]... [-e] PATTERN [FILE]...
Look for instances of PATTERN in the input FILEs, using their
uncompressed contents if they are compressed.

OPTIONs are the same as for 'grep'.

Report bugs to <bug-gzip@gnu.org>."

# sed script to escape all ' for the shell, and then (to handle trailing
# newlines correctly) turn trailing X on last line into '.
escape='
  s/'\''/'\''\\'\'''\''/g
  $s/X$/'\''/
'
operands=
have_pat=0
files_with_matches=0
files_without_matches=0
no_filename=0
with_filename=0

while test $# -ne 0; do
  option=$1
  shift
  optarg=

  case $option in
  (-[0123456789abcdhHiIKLlnoqrRsTuUvVwxyzZ]?*)
    arg2=-\'$(LC_ALL=C expr "X${option}X" : 'X-.[0-9]*\(.*\)' |
	      LC_ALL=C sed "$escape")
    eval "set -- $arg2 "'${1+"$@"}'
    option=$(LC_ALL=C expr "X$option" : 'X\(-.[0-9]*\)');;
  (--binary-*=* | --[lm]a*=* | --reg*=*)
    ;;
  (-[ABCDefm] | --binary-* | --file | --[lm]a* | --reg*)
    case ${1?"$option option requires an argument"} in
    (*\'*)
      optarg=" '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");;
    (*)
      optarg=" '$1'";;
    esac
    shift;;
  (--)
    break;;
  (-?*)
    ;;
  (*)
    case $option in
    (*\'*)
      operands="$operands '"$(printf '%sX\n' "$option" | LC_ALL=C sed "$escape");;
    (*)
      operands="$operands '$option'";;
    esac
    ${POSIXLY_CORRECT+break}
    continue;;
  esac

  case $option in
  (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
    printf >&2 '%s: %s: option not supported\n' "$0" "$option"
    exit 2;;
  (-[ef]* | --file | --file=* | --reg*)
    have_pat=1;;
  (--h | --he | --hel | --help)
    echo "$usage" || exit 2
    exit;;
  (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
  | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
  | --with-filename)
    with_filename=1
    continue;;
  (-l | --files-with-*)
    files_with_matches=1;;
  (-L | --files-witho*)
    files_without_matches=1;;
  ( -h | --no-f*)
    no_filename=1;;
  (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
    echo "$version" || exit 2
    exit;;
  esac

  case $option in
  (*\'?*)
    option=\'$(LC_ALL=C expr "X${option}X" : 'X\(.*\)' | LC_ALL=C sed "$escape");;
  (*)
    option="'$option'";;
  esac

  args="$args $option$optarg"
done

eval "set -- $operands "'${1+"$@"}'

if test $have_pat -eq 0; then
  case ${1?"missing pattern; try \`$0 --help' for help"} in
  (*\'*)
    args="$args -- '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");;
  (*)
    args="$args -- '$1'";;
  esac
  shift
fi

if test $# -eq 0; then
  set -- -
elif test 1 -lt $# && test $no_filename -eq 0; then
  with_filename=1
fi

l_e=$(eval "(echo e | $grep -H --label=l e) 2>/dev/null") && test "$l_e" = l:e
gnuish_grep="test $? -eq 0"
if $gnuish_grep && test $with_filename -eq 1; then
  grep="$grep -H"
fi

exec 3>&1
res=0
trap break SIGPIPE
for i
do
  # Fail if gzip or grep (or sed) fails.
  gzip_status=$(
    exec 5>&1
    (gzip -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
    if test $files_with_matches -eq 1; then
      eval "$grep$args" >/dev/null && { printf '%s\n' "$i" || exit 2; }
    elif test $files_without_matches -eq 1; then
      eval "$grep$args" >/dev/null || {
	r=$?
	if test $r -eq 1; then
	  printf '%s\n' "$i" || r=2
	fi
	exit $r
      }
    elif $gnuish_grep && test "$i" != -; then
      eval "$grep --label \"\$i\"$args"
    elif $gnuish_grep || test $with_filename -eq 0; then
      eval "$grep$args"
    else
      case $i in
      (*'
'* | *'&'* | *'\'* | *'|'*)
	icolon=$(printf '%s\n' "$i:" |
		 LC_ALL=C sed -e 's/[&\|]/\\&/g' -e '$!s/$/\\/');;
      (*) icolon="$i:";;
      esac
      sed_script="s|^|$icolon|"

      # Fail if grep or sed fails.
      r=$(
	exec 4>&1
	(eval "$grep$args" 4>&-; echo $? >&4) 3>&- |
	  LC_ALL=C sed "$sed_script" >&3 4>&-
      ) || r=2
      exit $r
    fi >&3 5>&-
  )
  r=$?
  test "$gzip_status" -eq 0 || test "$gzip_status" -eq 2 || r=2
  test $res -lt $r && res=$r
  # SIGPIPE + 128
  test "$r" -eq 141 && exit $res 
done
trap - SIGPIPE
exit $res