What it does: Repairs any item to full, preserving enchantment. How you use it: Place item and emerald in crafting grid. Craft. Emerald is consumed. Profit. Commands/perms/config: Nope, drag and drop.
That's fine, I usually do format and I'm a big proponent of it, but this time it didn't exactly seem necessary.
It was more of a joke, there is no actual 'profit' involved, other than the preservation of enchantments. Perhaps the profit could be the feeling of success...?
I made a request similar (uses gold) to this yesterday, though no one has offered to attempt it yet. http://forums.bukkit.org/threads/repairing-enchanted-items-using-gold.91537/