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{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TupleSections #-}
{-# OPTIONS_GHC -Wno-missing-signatures #-}
-- | a monad that collects warnings, outputs, etc,
module LintWriter
( runLintWriter
, LintWriter
, LintWriter'
, LintResult
, invertLintResult
, zoom
-- * working with lint results
, resultToDeps
, resultToOffers
, resultToBadges
, resultToLints
, resultToAdjusted
-- * Add lints to a linter
, info
, suggest
, warn
, forbid
, complain
-- * add other information to the linter
, offersEntrypoint
, offersBadge
, dependsOn
-- * get information about the linter's context
, askContext
, askFileDepth
, lintConfig
-- * adjust the linter's context
, adjust
) where
import Universum
import Badges (Badge)
import Data.Map (fromListWith)
import Data.Tiled.Abstract (HasName (getName))
import LintConfig (LintConfig')
import Types (Dep, Hint, Level (..), Lint (..), hint,
lintsToHints)
-- | A monad modelling the main linter features
type LintWriter ctxt = LintWriter' ctxt ()
-- | A linter that can use pure / return things monadically
type LintWriter' ctxt res =
StateT (LinterState ctxt) (Reader (Context, ctxt, LintConfig')) res
-- | A Linter's state: some context (which it may adjust), and a list of lints
-- | it already collected.
newtype LinterState ctxt = LinterState
{ fromLinterState :: ([Lint], ctxt)}
deriving Functor
-- | The result of running a linter: an adjusted context, and a list of lints.
-- | This is actually just a type synonym of LinterState, but kept seperately
-- | for largely historic reasons since I don't think I'll change it again
type LintResult ctxt = LinterState ctxt
-- | for now, all context we have is how "deep" in the directory tree
-- we currently are
type Context = Int
-- | run a linter. Returns the adjusted context, and a list of lints
runLintWriter
:: LintConfig' -> ctxt -> Context -> LintWriter ctxt -> LintResult ctxt
runLintWriter config context depth linter = LinterState
. fromLinterState
. snd
. runReader runstate
$ (depth, context, config)
where runstate = runStateT linter (LinterState ([], context))
zoom :: (a -> b) -> (b -> a) -> LintWriter a -> LintWriter' b a
zoom embed extract operation = do
config <- lintConfig id
depth <- askFileDepth
let result ctxt = runLintWriter config ctxt depth operation
LinterState (lints,a) <- get
let res = result . extract $ a
put $ LinterState
. (resultToLints res <> lints,)
. embed
. resultToAdjusted
$ res
pure $ resultToAdjusted res
-- | "invert" a linter's result, grouping lints by their messages
invertLintResult :: HasName ctxt => LintResult ctxt -> Map Hint [Text]
invertLintResult (LinterState (lints, ctxt)) =
fmap (sortNub . map getName) . fromListWith (<>) $ (, [ctxt]) <$> lintsToHints lints
resultToDeps :: LintResult a -> [Dep]
resultToDeps (LinterState (lints,_)) = mapMaybe lintToDep lints
where lintToDep = \case
Depends dep -> Just dep
_ -> Nothing
resultToOffers :: LintResult a -> [Text]
resultToOffers (LinterState a) = mapMaybe lintToOffer $ fst a
where lintToOffer = \case
Offers frag -> Just frag
_ -> Nothing
resultToBadges :: LintResult a -> [Badge]
resultToBadges (LinterState a) = mapMaybe lintToBadge $ fst a
where lintToBadge (Badge badge) = Just badge
lintToBadge _ = Nothing
-- | convert a lint result into a flat list of lints
resultToLints :: LintResult a -> [Lint]
resultToLints (LinterState res) = fst res
-- | extract the adjusted context from a lint result
resultToAdjusted :: LintResult a -> a
resultToAdjusted (LinterState res) = snd res
-- | fundamental linter operations: add a lint of some severity
info = lint Info
suggest = lint Suggestion
warn = lint Warning
forbid = lint Forbidden
complain = lint Error
-- | add a dependency to the linter
dependsOn :: Dep -> LintWriter a
dependsOn dep = tell' $ Depends dep
-- | add an offer for an entrypoint to the linter
offersEntrypoint :: Text -> LintWriter a
offersEntrypoint text = tell' $ Offers text
-- | add an offer for a badge to the linter
offersBadge :: Badge -> LintWriter a
offersBadge badge = tell' $ Badge badge
-- | get the context as it was initially, without any modifications
askContext :: LintWriter' a a
askContext = lift $ asks (\(_,a,_) -> a)
-- | ask for the file depth within the repository tree of the current map.
-- | This function brings in a lot more conceptual baggage than I'd like, but
-- | it's needed to check if relative paths lie outside the repository
askFileDepth :: LintWriter' a Int
askFileDepth = lift $ asks (\(a,_,_) -> a)
-- | ask for a specific part of the linter's global config
lintConfig :: (LintConfig' -> a) -> LintWriter' ctxt a
lintConfig get = lift $ asks (\(_,_,config) -> get config)
-- | tell, but for a singular lint. Leaves the context unchanged
tell' :: Lint -> LintWriter ctxt
tell' l = modify $ \(LinterState (lints, ctxt)) -> LinterState (l:lints, ctxt)
-- | small helper to tell a singlular proper lint
lint :: Level -> Text -> LintWriter a
lint level text = tell' $ hint level text
-- | adjusts the context. Gets a copy of the /current/ context,
-- | i.e. one which might have already been changed by other adjustments
adjust :: (a -> a) -> LintWriter a
adjust f = modify $ LinterState . second f . fromLinterState
|
