Auto-wrapping long lines

It's probably a quite tricky thing to implement, but it would be nice if there was an option to autowrap long (e.g., > 79 chars) lines. Some sort of heuristics could be used to figure out where to break the lines, e.g., first try breaking at "=". Then if either of parts is still too long, break farthest down the line that puts the line (w/ added ...) under the line limit.