#! /bin/sh

# h-grep -- "highlight" grep 
# $Id: h-grep,v 1.1 1998/09/06 23:15:04 cdua Exp cdua $
# Carlos Duarte, 980710

L="<"
R=">"
USAGE="\
usage: $0 [-h] [-1..9] pattern [files...]

  -h      this help
  -l      left string for highlight pattern (def: '$L')
  -r      left string for highlight pattern (def: '$R')
  -w      treat pattern as a word
  -1 .. -9
	  only searches for #ed occurrence (def: highlightes all)
  -p      only output lines that match pattern (def: outputs all)
  -b      enboldens pattern, if possible
"

G=g
while : ; do
	case x"$1" in 
	x-h)	echo "$USAGE"; exit 1 ;;
	x-l)	shift; L="$1" ;;
	x-r)	shift; R="$1" ;;
	x-p)	PP="p;d" ;;
	x-w)	WL='\<'; WR='\>' ;; 
	x-b)	L=`tput smso`; R=`tput rmso` ;;
	x-[1-9])
		G=`echo x$1 | cut -c3` ;; 
	x--)	shift; break ;;
	x-?)	echo "invalid option -- `echo $1|cut -c2-`"
		echo "$USAGE"; exit 1 ;;
	*)	break ;;
	esac
	shift
done

# if _must_ accept on extra argument after options
if test $# -eq 0; then echo "$USAGE"; exit 1; fi

PAT="`echo \"$1\"|sed 's:/:\\\\&:g'`"
shift

sed "s/$WL$PAT$WR/$L&$R/$G$PP" "$@"
exit