Usage: 
 /exportviaslash all
or 
 /exportviaslash profession
where profession is one of:
 "Blacksmithing", "Tailoring", "Inscription", "Jewelcrafting", "Alchemy",
 "Leatherworking", "Engineering", "Enchanting", "Cooking", "First Aid"

After running this slash command in the game, the exportviaslash.lua Saved variables file in WTF\Account will have the table SpellsMap.