Features request : case split, make definition.

[AnthonyJacob]

I really like idris language server.

Especially the case split feature.

map2 :: (a -> b -> c) -> [a] -> [b] -> [c]
map2 f x y = undefined

Right click x and choose case split.

map2 f [] y = undefined
map2 f (x:xs) y = undefined

Now lets forget about _|_ / bottom / undefined for a moment.

What can we do with the function f, if we don't have any variable of type a? Nothing... lets get rid of that.

map2 _ [] _ = []
map2 f (x:xs) y = undefined

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And also the named hole feature.

sum :: [Int] -> Int
-- we do not get compile error here, ?foo acts like undefined
-- you can hover over ?foo and see its type
sum = ?foo (+) 0 

Right click ?foo and select make definition.

sum :: [Int] -> Int
sum = foo (+) 0

foo :: (Int -> Int -> Int) -> Int -> [Int] -> Int
foo a b c = undefined