#!/bin/bash
# Kyle Davenport 2006 kdavenpo-at-tx-dot-rr-dot-com
# you may distribute this script under terms of the GPL

grepargs="A:B:CcEe:Ff:GHhilnsvwx"
usage() { echo "usage: rgrep [-a] [-d] -$grepargs [search-pattern] [file-pattern]" ;
	echo " ==> note: grep options default to -His " ;
	echo " use -a to follow all links"
	echo " use -d to turn on debugging"
	exit 1 ;
}

if [[ $* == *-a* ]]; then
	follow="-follow"
	shift
fi
if [[ $* == *-d* ]]; then
	debug=true
	echo "debugging enabled." >&2
	shift
fi

# some validity tests
which dirname>/dev/null||{ echo missing dirname - please make link to busybox;
			   exit 1; }
	
[ -z "$*" ] && usage
while getopts $grepargs arg
do
        args="$args -$arg $OPTARG"
done
echo $args | grep -q ' -? ' && usage
[ "$OPTIND" -gt 1 ] && shift $((OPTIND-1))
files=${2:-\*}
args=${args:--His}
if [ -d "$files" ]; then
	dir="$files"
	files='*'
else	
	dir=`dirname "$files"`
	files=`basename "$files"`
fi
count=0
match=0
echo EOR > /tmp/eor
${debug:-false} && echo "Search for \"$1\" in \"$dir/$files\" files with \"grep $args\"..." >&2
find $dir $follow -type f -name "$files" 2>/dev/null | cat - /tmp/eor | while read line; do
	if [ "$line" == EOR ]; then
		[ $count -eq 0 ] && { echo 'no files found!' >&2 ; exit -1; }
		[ $match -eq 0 ] && { echo "no matches found in $count files" >&2 ; exit -2; }
		exit 0
	fi
	${debug:-false} && echo "-->$line" >&2
	count=$((++count))
	grep $args -- "$1" "$line" && match=1
done 
rm -f /tmp/eor