52 lines
1.5 KiB
Haskell
52 lines
1.5 KiB
Haskell
module Language.Haskell.GhcMod.Caching.Types where
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import Utils
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import Data.Label
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import Distribution.Helper
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type CacheContents d a = Maybe ([FilePath], d, a)
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type CacheLens s d a = s :-> CacheContents d a
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data Cached m s d a = Cached {
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cacheFile :: FilePath,
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cacheLens :: Maybe (CacheLens s d a),
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cachedAction :: TimedCacheFiles
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-> d
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-> Maybe a
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-> m ([FilePath], a)
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-- ^ @cachedAction tcf data ma@
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--
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-- * @tcf@: Input file timestamps. Not technically necessary, just an
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-- optimizazion when knowing which input files changed can make updating the
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-- cache faster
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--
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-- * @data@: Arbitrary static input data to cache action. Can be used to
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-- invalidate the cache using something other than file timestamps
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-- i.e. environment tool version numbers
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--
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-- * @ma@: Cached data if it existed
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--
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-- Returns:
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--
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-- * @fst@: Input files used in generating the cache
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--
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-- * @snd@: Cache data, will be stored alongside the static input data in the
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-- 'cacheFile'
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--
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-- The cached action, will only run if one of the following is true:
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--
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-- * 'cacheFile' doesn\'t exist yet
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-- * 'cacheFile' exists and 'inputData' changed
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-- * any files returned by the cached action changed
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}
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data TimedCacheFiles = TimedCacheFiles {
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tcCacheFile :: Maybe TimedFile,
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-- ^ 'cacheFile' timestamp
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tcFiles :: [TimedFile]
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-- ^ Timestamped files returned by the cached action
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} deriving (Eq, Ord, Show)
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type ChCacheData = (Programs, FilePath, (String, String))
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