vim-haskell-indent

for one prefer the coding style exchangeable between space and tab indentation

indent

auto increment indent level when previous line end with specific keywords

where, let, in, case of, do, if, then, else, deriving, =, ->, ::, (, [, {

guard

discriminate among guard, 'or' as logic and 'or' in data

nested condition, enclosing

if then else, case of, (), [], {}

start at head of line with type declaration

type, newtype, data, class, instance

-- always start at head of line
foo x y =
	x + y

	--cursor was here but
type Foo = Int

module

module Foo where
-- no indent

module Foo (
	A,
	B ) where
-- no indent

proper indent with something

where, deriving, infix, function

alignment

where, let, | in data, enumrate with enclosure and comma

foo = (bar, bazz)
	where bar = 0
	      bazz = 1

let a = 0
    b = 1
in a + b

data Foo = One
         | Two
         | Three

foo =
    [ bar
    , bazz
    , pon
    ]

h-youhei/vim-haskell-indent