#!/bin/sh
# replacer by David Dumas <daviddumas@gmail.com>

if [[ $# -lt 2 ]];
then
	echo "USAGE: replacer [file] [replacement]"
	echo ""
	echo "If [file] contains the first and last lines of"
	echo "[replacement], then everything between them is"
	echo "replaced with the contents of [replacement]."
	exit 1
fi

if [ ! -f "$1" ];
then
	echo "File not found: \"$1\"."
	exit 127
fi

if [ ! -f "$2" ];
then
	echo "File not found: \"$2\"."
	exit 127
fi


rep_start=`cat $2 | head -1`
rep_end=`cat $2 | tail -1`

ed $1 << EOF > /dev/null 2>&1
/$rep_start/,/$rep_end/c
`cat $2`
.
w

EOF