655 lines
23 KiB
Haskell
655 lines
23 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE RankNTypes #-}
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module BrickMain where
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import GHCup
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import GHCup.Download
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import GHCup.Errors
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import GHCup.Types.Optics ( getDirs )
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import GHCup.Types hiding ( LeanAppState(..) )
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import GHCup.Utils
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import GHCup.OptParse.Common (logGHCPostRm)
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import GHCup.Prelude ( decUTF8Safe )
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import GHCup.Prelude.File
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import GHCup.Prelude.Logger
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import GHCup.Prelude.Process
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import GHCup.Prompts
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import Brick
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import Brick.Widgets.Border
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import Brick.Widgets.Border.Style
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import Brick.Widgets.Center
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import Brick.Widgets.List ( listSelectedFocusedAttr
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, listSelectedAttr
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, listAttr
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)
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import Codec.Archive
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import Control.Exception.Safe
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#if !MIN_VERSION_base(4,13,0)
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import Control.Monad.Fail ( MonadFail )
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#endif
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import Control.Monad.Reader
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import Control.Monad.Trans.Except
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import Control.Monad.Trans.Resource
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import Data.Bool
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import Data.Functor
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import Data.List
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import Data.Maybe
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import Data.IORef
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import Data.Vector ( Vector
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, (!?)
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)
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import Data.Versions hiding ( str )
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import Haskus.Utils.Variant.Excepts
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import Prelude hiding ( appendFile )
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import System.FilePath
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import System.Exit
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import System.IO.Unsafe
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import Text.PrettyPrint.HughesPJClass ( prettyShow )
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import URI.ByteString
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import qualified Data.Text as T
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import qualified Data.Text.Lazy.Builder as B
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import qualified Data.Text.Lazy as L
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import qualified Graphics.Vty as Vty
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import qualified Data.Vector as V
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import System.Environment (getExecutablePath)
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import qualified System.Posix.Process as SPP
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hiddenTools :: [Tool]
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hiddenTools = []
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data BrickData = BrickData
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{ lr :: [ListResult]
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}
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deriving Show
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data BrickSettings = BrickSettings
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{ showAllVersions :: Bool
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, showAllTools :: Bool
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}
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deriving Show
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data BrickInternalState = BrickInternalState
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{ clr :: Vector ListResult
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, ix :: Int
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}
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deriving Show
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data BrickState = BrickState
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{ appData :: BrickData
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, appSettings :: BrickSettings
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, appState :: BrickInternalState
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, appKeys :: KeyBindings
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}
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deriving Show
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keyHandlers :: KeyBindings
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-> [ ( Vty.Key
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, BrickSettings -> String
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, BrickState -> EventM String BrickState ()
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)
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]
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keyHandlers KeyBindings {..} =
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[ (bQuit, const "Quit" , \_ -> halt)
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, (bInstall, const "Install" , withIOAction install')
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, (bUninstall, const "Uninstall", withIOAction del')
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, (bSet, const "Set" , withIOAction set')
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, (bChangelog, const "ChangeLog", withIOAction changelog')
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, ( bShowAllVersions
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, \BrickSettings {..} ->
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if showAllVersions then "Don't show all versions" else "Show all versions"
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, hideShowHandler (not . showAllVersions) showAllTools
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)
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, ( bShowAllTools
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, \BrickSettings {..} ->
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if showAllTools then "Don't show all tools" else "Show all tools"
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, hideShowHandler showAllVersions (not . showAllTools)
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)
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, (bUp, const "Up", \BrickState {..} -> put BrickState{ appState = moveCursor 1 appState Up, .. })
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, (bDown, const "Down", \BrickState {..} -> put BrickState{ appState = moveCursor 1 appState Down, .. })
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]
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where
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hideShowHandler f p BrickState{..} =
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let newAppSettings = appSettings { showAllVersions = f appSettings , showAllTools = p appSettings }
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newInternalState = constructList appData newAppSettings (Just appState)
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in put (BrickState appData newAppSettings newInternalState appKeys)
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showKey :: Vty.Key -> String
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showKey (Vty.KChar c) = [c]
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showKey Vty.KUp = "↑"
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showKey Vty.KDown = "↓"
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showKey key = tail (show key)
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ui :: AttrMap -> BrickState -> Widget String
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ui dimAttrs BrickState{ appSettings = as@BrickSettings{}, ..}
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= padBottom Max
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( withBorderStyle unicode
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$ borderWithLabel (str "GHCup")
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(center (header <=> hBorder <=> renderList' appState))
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)
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<=> footer
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where
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footer =
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withAttr (attrName "help")
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. txtWrap
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. T.pack
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. foldr1 (\x y -> x <> " " <> y)
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. fmap (\(key, s, _) -> showKey key <> ":" <> s as)
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$ keyHandlers appKeys
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header =
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minHSize 2 emptyWidget
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<+> padLeft (Pad 2) (minHSize 6 $ str "Tool")
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<+> minHSize 15 (str "Version")
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<+> padLeft (Pad 1) (minHSize 25 $ str "Tags")
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<+> padLeft (Pad 5) (str "Notes")
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renderList' = withDefAttr listAttr . drawListElements renderItem True
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renderItem _ b listResult@ListResult{..} =
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let marks = if
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| lSet -> (withAttr (attrName "set") $ str "✔✔")
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| lInstalled -> (withAttr (attrName "installed") $ str "✓ ")
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| otherwise -> (withAttr (attrName "not-installed") $ str "✗ ")
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ver = case lCross of
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Nothing -> T.unpack . prettyVer $ lVer
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Just c -> T.unpack (c <> "-" <> prettyVer lVer)
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dim
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| lNoBindist && not lInstalled
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&& not b -- TODO: overloading dim and active ignores active
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-- so we hack around it here
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= updateAttrMap (const dimAttrs) . withAttr (attrName "no-bindist")
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| otherwise = id
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hooray
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| elem Latest lTag && not lInstalled =
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withAttr (attrName "hooray")
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| otherwise = id
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active = if b then putCursor "GHCup" (Location (0,0)) . forceAttr (attrName "active") else id
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in hooray $ active $ dim
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( marks
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<+> padLeft (Pad 2)
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( minHSize 6
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(printTool lTool)
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)
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<+> minHSize 15 (str ver)
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<+> (let l = catMaybes . fmap printTag $ sort lTag
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in padLeft (Pad 1) $ minHSize 25 $ if null l
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then emptyWidget
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else foldr1 (\x y -> x <+> str "," <+> y) l
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)
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<+> padLeft (Pad 5)
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( let notes = printNotes listResult
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in if null notes
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then emptyWidget
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else foldr1 (\x y -> x <+> str "," <+> y) notes
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)
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<+> vLimit 1 (fill ' ')
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)
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printTag Recommended = Just $ withAttr (attrName "recommended") $ str "recommended"
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printTag Latest = Just $ withAttr (attrName "latest") $ str "latest"
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printTag Prerelease = Just $ withAttr (attrName "prerelease") $ str "prerelease"
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printTag (Base pvp'') = Just $ str ("base-" ++ T.unpack (prettyPVP pvp''))
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printTag Old = Nothing
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printTag (UnknownTag t) = Just $ str t
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printTool Cabal = str "cabal"
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printTool GHC = str "GHC"
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printTool GHCup = str "GHCup"
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printTool HLS = str "HLS"
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printTool Stack = str "Stack"
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printNotes ListResult {..} =
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(if hlsPowered then [withAttr (attrName "hls-powered") $ str "hls-powered"] else mempty
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)
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++ (if fromSrc then [withAttr (attrName "compiled") $ str "compiled"] else mempty)
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++ (if lStray then [withAttr (attrName "stray") $ str "stray"] else mempty)
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-- | Draws the list elements.
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--
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-- Evaluates the underlying container up to, and a bit beyond, the
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-- selected element. The exact amount depends on available height
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-- for drawing and 'listItemHeight'. At most, it will evaluate up to
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-- element @(i + h + 1)@ where @i@ is the selected index and @h@ is the
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-- available height.
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drawListElements :: (Int -> Bool -> ListResult -> Widget String)
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-> Bool
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-> BrickInternalState
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-> Widget String
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drawListElements drawElem foc is@(BrickInternalState clr _) =
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Widget Greedy Greedy $
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let
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es = clr
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listSelected = fmap fst $ listSelectedElement' is
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drawnElements = flip V.imap es $ \i' e ->
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let addSeparator w = case es !? (i' - 1) of
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Just e' | lTool e' /= lTool e ->
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hBorder <=> w
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_ -> w
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isSelected = Just i' == listSelected
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elemWidget = drawElem i' isSelected e
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selItemAttr = if foc
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then withDefAttr listSelectedFocusedAttr
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else withDefAttr listSelectedAttr
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makeVisible' = if isSelected then visible . selItemAttr else id
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in addSeparator $ makeVisible' elemWidget
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in render
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$ viewport "GHCup" Vertical
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$ vBox
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$ V.toList drawnElements
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minHSize :: Int -> Widget n -> Widget n
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minHSize s' = hLimit s' . vLimit 1 . (<+> fill ' ')
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app :: AttrMap -> AttrMap -> App BrickState e String
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app attrs dimAttrs =
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App { appDraw = \st -> [ui dimAttrs st]
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, appHandleEvent = \be -> get >>= \s -> eventHandler s be
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, appStartEvent = return ()
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, appAttrMap = const attrs
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, appChooseCursor = showFirstCursor
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}
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defaultAttributes :: Bool -> AttrMap
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defaultAttributes no_color = attrMap
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Vty.defAttr
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[ (attrName "active" , Vty.defAttr `withBackColor` Vty.blue)
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, (attrName "not-installed", Vty.defAttr `withForeColor` Vty.red)
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, (attrName "set" , Vty.defAttr `withForeColor` Vty.green)
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, (attrName "installed" , Vty.defAttr `withForeColor` Vty.green)
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, (attrName "recommended" , Vty.defAttr `withForeColor` Vty.green)
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, (attrName "hls-powered" , Vty.defAttr `withForeColor` Vty.green)
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, (attrName "latest" , Vty.defAttr `withForeColor` Vty.yellow)
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, (attrName "prerelease" , Vty.defAttr `withForeColor` Vty.red)
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, (attrName "compiled" , Vty.defAttr `withForeColor` Vty.blue)
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, (attrName "stray" , Vty.defAttr `withForeColor` Vty.blue)
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, (attrName "help" , Vty.defAttr `withStyle` Vty.italic)
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, (attrName "hooray" , Vty.defAttr `withForeColor` Vty.brightWhite)
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]
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where
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withForeColor | no_color = const
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| otherwise = Vty.withForeColor
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withBackColor | no_color = \attr _ -> attr `Vty.withStyle` Vty.reverseVideo
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| otherwise = Vty.withBackColor
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withStyle = Vty.withStyle
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dimAttributes :: Bool -> AttrMap
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dimAttributes no_color = attrMap
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(Vty.defAttr `Vty.withStyle` Vty.dim)
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[ (attrName "active" , Vty.defAttr `withBackColor` Vty.blue) -- has no effect ??
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, (attrName "no-bindist", Vty.defAttr `Vty.withStyle` Vty.dim)
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]
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where
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withBackColor | no_color = \attr _ -> attr `Vty.withStyle` Vty.reverseVideo
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| otherwise = Vty.withBackColor
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eventHandler :: BrickState -> BrickEvent String e -> EventM String BrickState ()
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eventHandler st@BrickState{..} ev = do
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AppState { keyBindings = kb } <- liftIO $ readIORef settings'
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case ev of
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(MouseDown _ Vty.BScrollUp _ _) ->
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put (BrickState { appState = moveCursor 1 appState Up, .. })
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(MouseDown _ Vty.BScrollDown _ _) ->
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put (BrickState { appState = moveCursor 1 appState Down, .. })
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(VtyEvent (Vty.EvResize _ _)) -> put st
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(VtyEvent (Vty.EvKey Vty.KUp _)) ->
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put BrickState{ appState = moveCursor 1 appState Up, .. }
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(VtyEvent (Vty.EvKey Vty.KDown _)) ->
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put BrickState{ appState = moveCursor 1 appState Down, .. }
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(VtyEvent (Vty.EvKey key _)) ->
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case find (\(key', _, _) -> key' == key) (keyHandlers kb) of
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Nothing -> put st
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Just (_, _, handler) -> handler st
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_ -> put st
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moveCursor :: Int -> BrickInternalState -> Direction -> BrickInternalState
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moveCursor steps ais@BrickInternalState{..} direction =
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let newIx = if direction == Down then ix + steps else ix - steps
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in case clr !? newIx of
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Just _ -> BrickInternalState { ix = newIx, .. }
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Nothing -> ais
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-- | Suspend the current UI and run an IO action in terminal. If the
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-- IO action returns a Left value, then it's thrown as userError.
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withIOAction :: Ord n
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=> (BrickState
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-> (Int, ListResult)
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-> ReaderT AppState IO (Either String a))
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-> BrickState
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-> EventM n BrickState ()
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withIOAction action as = case listSelectedElement' (appState as) of
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Nothing -> put as
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Just (ix, e) -> do
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suspendAndResume $ do
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settings <- readIORef settings'
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flip runReaderT settings $ action as (ix, e) >>= \case
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Left err -> liftIO $ putStrLn ("Error: " <> err)
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Right _ -> liftIO $ putStrLn "Success"
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getAppData Nothing >>= \case
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Right data' -> do
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putStrLn "Press enter to continue"
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_ <- getLine
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pure (updateList data' as)
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Left err -> throwIO $ userError err
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-- | Update app data and list internal state based on new evidence.
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-- This synchronises @BrickInternalState@ with @BrickData@
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-- and @BrickSettings@.
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updateList :: BrickData -> BrickState -> BrickState
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updateList appD BrickState{..} =
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let newInternalState = constructList appD appSettings (Just appState)
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in BrickState { appState = newInternalState
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, appData = appD
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, appSettings = appSettings
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, appKeys = appKeys
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}
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constructList :: BrickData
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-> BrickSettings
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-> Maybe BrickInternalState
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-> BrickInternalState
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constructList appD appSettings =
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replaceLR (filterVisible (showAllVersions appSettings)
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(showAllTools appSettings))
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(lr appD)
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listSelectedElement' :: BrickInternalState -> Maybe (Int, ListResult)
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listSelectedElement' BrickInternalState{..} = fmap (ix, ) $ clr !? ix
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selectLatest :: Vector ListResult -> Int
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selectLatest = fromMaybe 0 . V.findIndex (\ListResult {..} -> lTool == GHC && Latest `elem` lTag)
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-- | Replace the @appState@ or construct it based on a filter function
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-- and a new @[ListResult]@ evidence.
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-- When passed an existing @appState@, tries to keep the selected element.
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replaceLR :: (ListResult -> Bool)
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-> [ListResult]
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-> Maybe BrickInternalState
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-> BrickInternalState
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replaceLR filterF lr s =
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let oldElem = s >>= listSelectedElement'
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newVec = V.fromList . filter filterF $ lr
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newSelected =
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case oldElem >>= \(_, oldE) -> V.findIndex (toolEqual oldE) newVec of
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Just ix -> ix
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Nothing -> selectLatest newVec
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in BrickInternalState newVec newSelected
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where
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toolEqual e1 e2 =
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lTool e1 == lTool e2 && lVer e1 == lVer e2 && lCross e1 == lCross e2
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filterVisible :: Bool -> Bool -> ListResult -> Bool
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filterVisible v t e | lInstalled e = True
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| v
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, not t
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, lTool e `notElem` hiddenTools = True
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| not v
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, t
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, Old `notElem` lTag e = True
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| v
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, t = True
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| otherwise = (Old `notElem` lTag e) &&
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(lTool e `notElem` hiddenTools)
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install' :: (MonadReader AppState m, MonadIO m, MonadThrow m, MonadFail m, MonadMask m, MonadUnliftIO m)
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=> BrickState
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-> (Int, ListResult)
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-> m (Either String ())
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install' _ (_, ListResult {..}) = do
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AppState { ghcupInfo = GHCupInfo { _ghcupDownloads = dls }} <- ask
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let run =
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runResourceT
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. runE
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@'[ AlreadyInstalled
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, ArchiveResult
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, UnknownArchive
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, FileDoesNotExistError
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, CopyError
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, NoDownload
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, NotInstalled
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, BuildFailed
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, TagNotFound
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, DigestError
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, ContentLengthError
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, GPGError
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, DownloadFailed
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, DirNotEmpty
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, NoUpdate
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, TarDirDoesNotExist
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, FileAlreadyExistsError
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, ProcessError
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, ToolShadowed
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, UninstallFailed
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, MergeFileTreeError
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]
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run (do
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ce <- liftIO $ fmap (either (const Nothing) Just) $
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try @_ @SomeException $ getExecutablePath >>= canonicalizePath
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dirs <- lift getDirs
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case lTool of
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GHC -> do
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let vi = getVersionInfo lVer GHC dls
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liftE $ installGHCBin lVer GHCupInternal False [] $> (vi, dirs, ce)
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Cabal -> do
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let vi = getVersionInfo lVer Cabal dls
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liftE $ installCabalBin lVer GHCupInternal False $> (vi, dirs, ce)
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GHCup -> do
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let vi = snd <$> getLatest dls GHCup
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liftE $ upgradeGHCup Nothing False False $> (vi, dirs, ce)
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HLS -> do
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let vi = getVersionInfo lVer HLS dls
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liftE $ installHLSBin lVer GHCupInternal False $> (vi, dirs, ce)
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Stack -> do
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let vi = getVersionInfo lVer Stack dls
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liftE $ installStackBin lVer GHCupInternal False $> (vi, dirs, ce)
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)
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>>= \case
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VRight (vi, Dirs{..}, Just ce) -> do
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forM_ (_viPostInstall =<< vi) $ \msg -> logInfo msg
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case lTool of
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GHCup -> do
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up <- liftIO $ fmap (either (const Nothing) Just)
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$ try @_ @SomeException $ canonicalizePath (binDir </> "ghcup" <.> exeExt)
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when ((normalise <$> up) == Just (normalise ce)) $
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-- TODO: track cli arguments of previous invocation
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liftIO $ SPP.executeFile ce False ["tui"] Nothing
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logInfo "Please restart 'ghcup' for the changes to take effect"
|
|
_ -> pure ()
|
|
pure $ Right ()
|
|
VRight (vi, _, _) -> do
|
|
forM_ (_viPostInstall =<< vi) $ \msg -> logInfo msg
|
|
logInfo "Please restart 'ghcup' for the changes to take effect"
|
|
pure $ Right ()
|
|
VLeft (V (AlreadyInstalled _ _)) -> pure $ Right ()
|
|
VLeft (V NoUpdate) -> pure $ Right ()
|
|
VLeft e -> pure $ Left $ prettyHFError e <> "\n"
|
|
<> "Also check the logs in ~/.ghcup/logs"
|
|
|
|
|
|
set' :: (MonadReader AppState m, MonadIO m, MonadThrow m, MonadFail m, MonadMask m, MonadUnliftIO m)
|
|
=> BrickState
|
|
-> (Int, ListResult)
|
|
-> m (Either String ())
|
|
set' bs input@(_, ListResult {..}) = do
|
|
settings <- liftIO $ readIORef settings'
|
|
|
|
let run =
|
|
flip runReaderT settings
|
|
. runE @'[FileDoesNotExistError , NotInstalled , TagNotFound]
|
|
|
|
run (do
|
|
case lTool of
|
|
GHC -> liftE $ setGHC (GHCTargetVersion lCross lVer) SetGHCOnly Nothing $> ()
|
|
Cabal -> liftE $ setCabal lVer $> ()
|
|
HLS -> liftE $ setHLS lVer SetHLSOnly Nothing $> ()
|
|
Stack -> liftE $ setStack lVer $> ()
|
|
GHCup -> pure ()
|
|
)
|
|
>>= \case
|
|
VRight _ -> pure $ Right ()
|
|
VLeft e -> case e of
|
|
(V (NotInstalled tool _)) -> do
|
|
promptAnswer <- getUserPromptResponse userPrompt
|
|
case promptAnswer of
|
|
PromptYes -> do
|
|
res <- install' bs input
|
|
case res of
|
|
(Left err) -> pure $ Left err
|
|
(Right _) -> do
|
|
logInfo "Setting now..."
|
|
set' bs input
|
|
|
|
PromptNo -> pure $ Left (prettyHFError e)
|
|
where
|
|
userPrompt = L.toStrict . B.toLazyText . B.fromString $
|
|
"This Version of "
|
|
<> show tool
|
|
<> " you are trying to set is not installed.\n"
|
|
<> "Would you like to install it first? [Y/N]: "
|
|
|
|
_ -> pure $ Left (prettyHFError e)
|
|
|
|
|
|
|
|
del' :: (MonadReader AppState m, MonadIO m, MonadFail m, MonadMask m, MonadUnliftIO m)
|
|
=> BrickState
|
|
-> (Int, ListResult)
|
|
-> m (Either String ())
|
|
del' _ (_, ListResult {..}) = do
|
|
AppState { ghcupInfo = GHCupInfo { _ghcupDownloads = dls }} <- ask
|
|
|
|
let run = runE @'[NotInstalled, UninstallFailed]
|
|
|
|
run (do
|
|
let vi = getVersionInfo lVer lTool dls
|
|
case lTool of
|
|
GHC -> liftE $ rmGHCVer (GHCTargetVersion lCross lVer) $> vi
|
|
Cabal -> liftE $ rmCabalVer lVer $> vi
|
|
HLS -> liftE $ rmHLSVer lVer $> vi
|
|
Stack -> liftE $ rmStackVer lVer $> vi
|
|
GHCup -> pure Nothing
|
|
)
|
|
>>= \case
|
|
VRight vi -> do
|
|
logGHCPostRm (mkTVer lVer)
|
|
forM_ (_viPostRemove =<< vi) $ \msg ->
|
|
logInfo msg
|
|
pure $ Right ()
|
|
VLeft e -> pure $ Left (prettyHFError e)
|
|
|
|
|
|
changelog' :: (MonadReader AppState m, MonadIO m)
|
|
=> BrickState
|
|
-> (Int, ListResult)
|
|
-> m (Either String ())
|
|
changelog' _ (_, ListResult {..}) = do
|
|
AppState { pfreq, ghcupInfo = GHCupInfo { _ghcupDownloads = dls }} <- ask
|
|
case getChangeLog dls lTool (Left lVer) of
|
|
Nothing -> pure $ Left $
|
|
"Could not find ChangeLog for " <> prettyShow lTool <> ", version " <> T.unpack (prettyVer lVer)
|
|
Just uri -> do
|
|
let cmd = case _rPlatform pfreq of
|
|
Darwin -> "open"
|
|
Linux _ -> "xdg-open"
|
|
FreeBSD -> "xdg-open"
|
|
Windows -> "start"
|
|
exec cmd [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing >>= \case
|
|
Right _ -> pure $ Right ()
|
|
Left e -> pure $ Left $ prettyHFError e
|
|
|
|
|
|
settings' :: IORef AppState
|
|
{-# NOINLINE settings' #-}
|
|
settings' = unsafePerformIO $ do
|
|
dirs <- getAllDirs
|
|
let loggerConfig = LoggerConfig { lcPrintDebug = False
|
|
, consoleOutter = \_ -> pure ()
|
|
, fileOutter = \_ -> pure ()
|
|
, fancyColors = True
|
|
}
|
|
newIORef $ AppState defaultSettings
|
|
dirs
|
|
defaultKeyBindings
|
|
(GHCupInfo mempty mempty mempty)
|
|
(PlatformRequest A_64 Darwin Nothing)
|
|
loggerConfig
|
|
|
|
|
|
|
|
brickMain :: AppState
|
|
-> IO ()
|
|
brickMain s = do
|
|
writeIORef settings' s
|
|
|
|
eAppData <- getAppData (Just $ ghcupInfo s)
|
|
case eAppData of
|
|
Right ad ->
|
|
defaultMain
|
|
(app (defaultAttributes (noColor $ settings s)) (dimAttributes (noColor $ settings s)))
|
|
(BrickState ad
|
|
defaultAppSettings
|
|
(constructList ad defaultAppSettings Nothing)
|
|
(keyBindings (s :: AppState))
|
|
|
|
)
|
|
$> ()
|
|
Left e -> do
|
|
flip runReaderT s $ logError $ "Error building app state: " <> T.pack (show e)
|
|
exitWith $ ExitFailure 2
|
|
|
|
|
|
defaultAppSettings :: BrickSettings
|
|
defaultAppSettings = BrickSettings { showAllVersions = False, showAllTools = False }
|
|
|
|
|
|
getGHCupInfo :: IO (Either String GHCupInfo)
|
|
getGHCupInfo = do
|
|
settings <- readIORef settings'
|
|
|
|
r <-
|
|
flip runReaderT settings
|
|
. runE @'[DigestError, ContentLengthError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
|
|
$ liftE getDownloadsF
|
|
|
|
case r of
|
|
VRight a -> pure $ Right a
|
|
VLeft e -> pure $ Left (prettyHFError e)
|
|
|
|
|
|
getAppData :: Maybe GHCupInfo
|
|
-> IO (Either String BrickData)
|
|
getAppData mgi = runExceptT $ do
|
|
r <- ExceptT $ maybe getGHCupInfo (pure . Right) mgi
|
|
liftIO $ modifyIORef settings' (\s -> s { ghcupInfo = r })
|
|
settings <- liftIO $ readIORef settings'
|
|
|
|
flip runReaderT settings $ do
|
|
lV <- listVersions Nothing Nothing
|
|
pure $ BrickData (reverse lV)
|