#! /bin/sh
#
###	offset - indent each line (default: 5 spaces); write to stdout
###	Usage: offset [-##] [files]

# GET INDENTATION (IF ANY) AND CHECK FOR BOGUS NUMBERS:
case "$1" in
-[0-9]|-[0-9][0-9]) indent="$1"; shift ;;
-*)	echo "`basename $0`: '$1' isn't -number or is > 99." 1>&2; exit 1 ;;
esac

# SET DEFAULT:
case "$indent" in
"")	indent=-5 ;;
esac

# BUILD THE SPACES FOR sed.
# FIRST case DOES MULTIPLES OF 10; SECOND case DOES SINGLE SPACES:
s="          "	# TEN SPACES
case "$indent" in
-?)	;;	# LESS THAN 10; SKIP IT
-1?) pad="$s" ;;
-2?) pad="$s$s" ;;
-3?) pad="$s$s$s" ;;
-4?) pad="$s$s$s$s" ;;
-5?) pad="$s$s$s$s$s" ;;
-6?) pad="$s$s$s$s$s$s" ;;
-7?) pad="$s$s$s$s$s$s$s" ;;
-8?) pad="$s$s$s$s$s$s$s$s" ;;
-9?) pad="$s$s$s$s$s$s$s$s$s" ;;
*)	echo "`basename $0`: Help! \$indent is '$indent'!?!" 1>&2; exit 1 ;;
esac

case "$indent" in
-0|-?0)	;;	# SKIP IT; IT'S A MULTIPLE OF 10
-1|-?1) pad="$pad " ;;
-2|-?2) pad="$pad  " ;;
-3|-?3) pad="$pad   " ;;
-4|-?4) pad="$pad    " ;;
-5|-?5) pad="$pad     " ;;
-6|-?6) pad="$pad      " ;;
-7|-?7) pad="$pad       " ;;
-8|-?8) pad="$pad        " ;;
-9|-?9) pad="$pad         " ;;
*)	echo "`basename $0`: Help! \$indent is '$indent'!?!" 1>&2; exit 1 ;;
esac

# MIGHT ADD expand FIRST TO TAKE CARE OF TABS:
sed "s/^/$pad/" $*