ghcup-hs/lib/GHCup/Requirements.hs

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{-# LANGUAGE OverloadedStrings #-}
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{-|
Module : GHCup.Requirements
Description : Requirements utilities
Copyright : (c) Julian Ospald, 2020
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License : LGPL-3.0
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Maintainer : hasufell@hasufell.de
Stability : experimental
Portability : POSIX
-}
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module GHCup.Requirements where
import GHCup.Types
import GHCup.Types.JSON ( )
import GHCup.Types.Optics
import GHCup.Version
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import Control.Applicative
import Data.List ( find )
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import Data.Maybe
import Optics
import Prelude hiding ( abs
, readFile
, writeFile
)
import qualified Data.Map.Strict as M
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import qualified Data.Text as T
-- | Get the requirements. Right now this combines GHC and cabal
-- and doesn't do fine-grained distinction. However, the 'ToolRequirements'
-- type allows it.
getCommonRequirements :: PlatformResult
-> ToolRequirements
-> Maybe Requirements
getCommonRequirements pr tr =
with_distro <|> without_distro_ver <|> without_distro
where
with_distro = distro_preview _platform _distroVersion
without_distro_ver = distro_preview _platform (const Nothing)
without_distro = distro_preview (set _Linux UnknownLinux . _platform) (const Nothing)
distro_preview f g =
let platformVersionSpec =
preview (ix GHC % ix Nothing % ix (f pr)) tr
mv' = g pr
in fmap snd
. find
(\(mverRange, _) -> maybe
(mv' == Nothing)
(\range -> maybe False (flip versionRange range) mv')
mverRange
)
. M.toList
=<< platformVersionSpec
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prettyRequirements :: Requirements -> T.Text
prettyRequirements Requirements {..} =
let d = if not . null $ _distroPKGs
then
"\n Please install the following distro packages: "
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<> T.intercalate " " _distroPKGs
else ""
n = if not . T.null $ _notes then "\n Note: " <> _notes else ""
in "System requirements " <> d <> n