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Filename : dgrep
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#!/bin/sh

# dgrep -- grep through files belonging to an installed Debian package

# Copyright (C) 2001 Matt Zimmerman <mdz@debian.org>

# 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, 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

set -e

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

case "$prog" in
    grep|egrep|fgrep|zgrep|zegrep|zfgrep) ;;
    *) echo >&2 "dgrep: Unrecognized invocation: $0"; exit 1 ;;
esac

# Option parser modeled after the one in zgrep from GNU grep

recursive=0
opts=""
pat=""
after_args=""
while test $# -ne 0; do
    case "$1" in
        --recursive|--d*=recurse) echo >&2 "dgrep: recursive grep not supported"
            exit 1
            ;;
        --d*=skip) ;;
        --d*=read) echo >&2 "dgrep: --directories=read not supported"; exit 1 ;;
        --help)
            echo "Usage: dgrep [most grep options] <pattern> <package>..."; exit 0 ;;
        --*) ;;
        -*)
            case "$1" in
                -*r*) echo >&2 "dgrep: recursive grep not supported"; exit 1 ;;
            esac
            ;;
    esac
    case "$after_args$1" in
        -[ef]) opts="$opts $1"; shift; pat=$1 ;;
        -[ABCdm]) opts="$opts $1 $2"; shift ;;
        --) opts="$opts $1"; after_args=1 ;;
        -*) opts="$opts $1" ;;
        *)
            if test -z "$pat"; then
                pat=$1
            else
                break
            fi
            ;;
    esac
    shift
done

for pkgglob in "$@"; do dglob -0f "$pkgglob"; done | xargs -0r $prog $opts "$pat"