Equality alignment with guards

[marcosh]

Question

If I have a function with a guard like

f :: [Int] -> Int
f (x : xs) | x' > 5 = 37
f _ = 13

I would expect hindent to align the = signs, as in

f :: [Int] -> Int
f (x : xs) | x' > 5 = 37
f _                 = 13

Instead it aligns the = of the second line with the | of the first, as in

f :: [Int] -> Int
f (x : xs) | x' > 5 = 37
f _        = 13

Is this the desired and correct behaviour?

[toku-sa-n]

Actually, stylish-haskell does this kind of job, although it doesn't format your input well as you're using a guard. It formats the following input

f :: [Int] -> Int
f (x : xs) = 37
f _ = 13

to

f :: [Int] -> Int
f (x : xs) = 37
f _        = 13

Btw, my recommendation is to run cat source.hs|hindent|stylish-haskell. It formats the input pretty nicely.

@mihaimaruseac Do we close this issue as it's stylish-haskell's job, or keep it open as a feature request?

[mihaimaruseac]

I think it should either not align at all (minimize git diffs) or align equals to equals

[toku-sa-n]

Agreed. After reviewing other issues, I've decided to keep this one open as there is another align-related issue (#230). It may be good to let HIndent consider alignments in the future.

[toku-sa-n]

Maybe we can implement this by using format defined in stylish-haskell.