#!/bin/sh
#
# Change tabs to spaces in a text file
#

[ $# -ge 2 ] || { echo "usage: t2s tabsize file ..." >&2; exit 1; }

case $1 in [0-9]*) ;; *) echo "t2s: Invalid tab size" >&2; exit 1;; esac

tmpfile=$(mktemp ~/.t2s.XXXXXX) || exit 1

ts=$1
shift
for f in "$@"; do
    expand -$ts "$f" >$tmpfile
    mv -f $tmpfile "$f" && chmod go+r "$f"
done

rm -f $tmpfile
.