+set_var() {
+ local name=$1 new=$2 before=$3
+
+ name_re="^($name=|# $name is not set)"
+ before_re="^($before=|# $before is not set)"
+ if test -n "$before" && grep -Eq "$before_re" "$FN"; then
+ sed -ri "/$before_re/a $new" "$FN"
+ elif grep -Eq "$name_re" "$FN"; then
+ sed -ri "s:$name_re.*:$new:" "$FN"
+ else
+ echo "$new" >>"$FN"
+ fi