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#!/bin/sh
#
#    zipgrep: Use unzip and egrep to search the specified members of a
# Zip archive for a string or pattern.  Search all members if no members
# are specified explicitly.  The script attempts to handle egrep's "-h"
# and "-l" options internally.
#
# This script assumes that the desired "unzip" and "egrep" (and "sed")
# programs are on the user's PATH.
#

pat=""
opt=""
while test $# -ne 0; do
  case "$1" in
  -e | -f) opt="$opt $1"; shift; pat="$1";;
  -*)      opt="$opt $1";;
   *)      if test -z "$pat"; then
             pat="$1"
           else
             break;
           fi;;
  esac
  shift
done

if test $# = 0; then
  echo usage: `basename "$0"` "[egrep_options] pattern zipfile [members...]"
  echo Uses unzip and egrep to search the zip members for a string or pattern.
  exit 1
fi
zipfile="$1"; shift

list=0
silent=0
opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
case "$opt" in
  *l*) list=1; opt=`echo $opt | sed s/l//`
esac
case "$opt" in
  *h*) silent=1
esac
if test -n "$opt"; then
  opt="-$opt"
fi

status_grep_global=1
IFS='
'

# Escape shell-special characters in "pat".
pat=` echo "$pat" | \
 sed -e 's/\\\\/\\\\\\\\/g' -e 's/|/\\\|/g' -e 's/&/\\\&/g' `

# Use "unzip -Z1" to get a listing of the specified members from the
# specified archive.  Escape any backslashes in a file name.
for i in `unzip -Z1 "$zipfile" ${1+"$@"} | sed -e 's/\\\\/\\\\\\\\/g' `; do
  if test $list -eq 1; then
    # "-l": Show only the archive member name, not the matching line(s).
    unzip -p-L "$zipfile" "$i" | \
     egrep $opt "$pat" > /dev/null && echo "$i"
    status_grep=$?
  elif test $silent -eq 1; then
    # "-h": Show only the matching line(s), not the archive member name.
    # ("-s" in "opt" will silence "egrep", stopping all output.)
    unzip -p-L "$zipfile" "$i" | \
     egrep $opt "$pat"
    status_grep=$?
  else
    # Escape (or re-escape) shell-special characters in the archive
    # member name, "i".
    i=` echo "$i" | \
     sed -e 's/\\\\/\\\\\\\\/g' -e 's/|/\\\|/g' -e 's/&/\\\&/g' `

    # Globally, send fd 4 to stdout.  In the pipeline, send normal
    # stdout to fd 4, and send grep status to fd 3.  Collect fd 3
    # with ``.
    exec 4>&1
    status_grep=` ( \
     ( unzip -p-L "$zipfile" "$i" | \
     egrep $opt "$pat" 1>&4 ; echo $? >&3 ) 4>&1 | \
     sed "s|^|${i}:|" 1>&4 \
     ) 3>&1 `
  fi

  # Save the primary command status.  (May be the grep status.)
  sts=$?
  # If this grep status was zero, set the global grep status to zero.
  test "$status_grep" -eq 0 && status_grep_global=0
  # If this grep status was not zero or one, exit now.
  test "$status_grep" -gt 1 && exit "$status_grep"

done

# If "sts" is good (0), then exit with the global grep status.
# Else, when "sts" is bad, exit with the worst status we can find.
if test $sts -eq 0 ; then
  exit $status_grep_global
else
  if test "$status_grep" -gt 1 ; then
    exit "$status_grep"
  else
    exit $sts
  fi
fi