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#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
ifnew [-v] FILE
EOF
}
MV_ARGS=''
while getopts 'v' flag; do
case "$flag" in
(v)
MV_ARGS='-v'
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
FILE="${1:-}"
eval "$(assert-arg -- "$FILE" 'FILE')"
STDIN="$FILE.$(uuid).tmp"
trap 'rm -f "$STDIN"' EXIT
cat - > "$STDIN"
cmp -s "$STDIN" "$FILE" || mv $MV_ARGS "$STDIN" "$FILE"
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