Fix bug with isolated installation of not previously installed versions

It would error out trying to set the version.

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Revision history for ghcup
 
+## 0.1.17.6 -- ????-??-??
+
+* Vastly improve shell completions wrt [#242](https://gitlab.haskell.org/haskell/ghcup-hs/-/merge_requests/242)
+* Fix 'ghcup install cabal/hls/stack --set' wrt [#324](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/324)
+* Fix bad error message wrt [#323](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/323)
+
 ## 0.1.17.5 -- 2022-02-26
 
 * Implement `ghcup run` subcommand wrt [#137](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/137)

app/ghcup/GHCup/OptParse.hs

@@ -113,8 +113,8 @@ data Command
 opts :: Parser Options
 opts =
   Options
-    <$> invertableSwitch "verbose" 'v' False (help "Enable verbosity (default: disabled)")
+    <$> invertableSwitch "verbose" (Just 'v') False (help "Enable verbosity (default: disabled)")
-    <*> invertableSwitch "cache" 'c' False (help "Cache downloads in ~/.ghcup/cache (default: disabled)")
+    <*> invertableSwitch "cache" (Just 'c') False (help "Cache downloads in ~/.ghcup/cache (default: disabled)")
     <*> optional (option auto (long "metadata-caching" <> help "How long the yaml metadata caching interval is (in seconds), 0 to disable" <> internal))
     <*> optional
           (option
@@ -124,9 +124,10 @@ opts =
             <> metavar "URL"
             <> help "Alternative ghcup download info url"
             <> internal
+            <> completer fileUri
             )
           )
-    <*> (fmap . fmap) not (invertableSwitch "verify" 'n' True (help "Disable tarball checksum verification (default: enabled)"))
+    <*> (fmap . fmap) not (invertableSwitch "verify" (Just 'n') True (help "Disable tarball checksum verification (default: enabled)"))
     <*> optional (option
           (eitherReader keepOnParser)
           (  long "keep"
@@ -134,6 +135,7 @@ opts =
           <> help
                "Keep build directories? (default: errors)"
           <> hidden
+          <> completer (listCompleter ["always", "errors", "never"])
           ))
     <*> optional (option
           (eitherReader downloaderParser)
@@ -142,20 +144,23 @@ opts =
           <> metavar "<internal|curl|wget>"
           <> help
           "Downloader to use (default: internal)"
+          <> completer (listCompleter ["internal", "curl", "wget"])
 #else
           <> metavar "<curl|wget>"
           <> help
           "Downloader to use (default: curl)"
+          <> completer (listCompleter ["curl", "wget"])
 #endif
           <> hidden
           ))
-    <*> invertableSwitch "offline" 'o' False (help "Don't do any network calls, trying cached assets and failing if missing.")
+    <*> invertableSwitch "offline" (Just 'o') False (help "Don't do any network calls, trying cached assets and failing if missing.")
     <*> optional (option
           (eitherReader gpgParser)
           (  long "gpg"
           <> metavar "<strict|lax|none>"
           <> help
           "GPG verification (default: none)"
+          <> completer (listCompleter ["strict", "lax", "none"])
           ))
     <*> com
  where

app/ghcup/GHCup/OptParse/ChangeLog.hs

@@ -76,6 +76,7 @@ changelogP =
             )
             (short 't' <> long "tool" <> metavar "<ghc|cabal|ghcup>" <> help
               "Open changelog for given tool (default: ghc)"
+              <> completer toolCompleter
             )
           )
     <*> optional (toolVersionArgument Nothing Nothing)

app/ghcup/GHCup/OptParse/Common.hs

@@ -3,6 +3,8 @@
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE NumericUnderscores #-}
 
 module GHCup.OptParse.Common where
 
@@ -14,36 +16,55 @@ import           GHCup.Platform
 import           GHCup.Types
 import           GHCup.Types.Optics
 import           GHCup.Utils
+import           GHCup.Utils.File
 import           GHCup.Utils.Logger
 import           GHCup.Utils.MegaParsec
 import           GHCup.Utils.Prelude
 
+import           Control.DeepSeq
+import           Control.Concurrent
+import           Control.Concurrent.Async
 import           Control.Exception.Safe
 #if !MIN_VERSION_base(4,13,0)
 import           Control.Monad.Fail             ( MonadFail )
 #endif
 import           Control.Monad.Reader
+import           Data.Aeson
+#if MIN_VERSION_aeson(2,0,0)
+import qualified Data.Aeson.Key    as KM
+import qualified Data.Aeson.KeyMap as KM
+#else
+import qualified Data.HashMap.Strict as KM
+#endif
+import           Data.ByteString.Lazy           ( ByteString )
 import           Data.Bifunctor
 import           Data.Char
 import           Data.Either
 import           Data.Functor
-import           Data.List                      ( nub, sort, sortBy )
+import           Data.List                      ( nub, sort, sortBy, isPrefixOf, stripPrefix )
 import           Data.Maybe
 import           Data.Text                      ( Text )
 import           Data.Versions           hiding ( str )
 import           Data.Void
+import qualified Data.Vector      as V
+import           GHC.IO.Exception
 import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           Safe
+import           System.Directory
+import           System.Process                  ( readProcess )
 import           System.FilePath
+import           Text.HTML.TagSoup       hiding ( Tag )
 import           URI.ByteString
 
 import qualified Data.ByteString.UTF8          as UTF8
 import qualified Data.Map.Strict               as M
 import qualified Data.Text                     as T
 import qualified Text.Megaparsec               as MP
+import qualified System.FilePath.Posix         as FP
 import GHCup.Version
+import Control.Exception (evaluate)
 
 
     -------------
@@ -117,7 +138,7 @@ versionArgument criteria tool = argument (eitherReader tVersionEither) (metavar
 -- the help is shown only for --no-recursive.
 invertableSwitch
     :: String              -- ^ long option
-    -> Char                -- ^ short option for the non-default option
+    -> Maybe Char          -- ^ short option for the non-default option
     -> Bool                -- ^ is switch enabled by default?
     -> Mod FlagFields Bool -- ^ option modifier
     -> Parser (Maybe Bool)
@@ -128,14 +149,14 @@ invertableSwitch longopt shortopt defv optmod = invertableSwitch' longopt shorto
 -- | Allows providing option modifiers for both --foo and --no-foo.
 invertableSwitch'
     :: String              -- ^ long option (eg "foo")
-    -> Char                -- ^ short option for the non-default option
+    -> Maybe Char          -- ^ short option for the non-default option
     -> Bool                -- ^ is switch enabled by default?
     -> Mod FlagFields Bool -- ^ option modifier for --foo
     -> Mod FlagFields Bool -- ^ option modifier for --no-foo
     -> Parser (Maybe Bool)
 invertableSwitch' longopt shortopt defv enmod dismod = optional
-    ( flag' True ( enmod <> long longopt <> if defv then mempty else short shortopt)
+    ( flag' True ( enmod <> long longopt <> if defv then mempty else maybe mempty short shortopt)
-    <|> flag' False (dismod <> long nolongopt <> if defv then short shortopt else mempty)
+    <|> flag' False (dismod <> long nolongopt <> if defv then maybe mempty short shortopt else mempty)
     )
   where
     nolongopt = "no-" ++ longopt
@@ -277,6 +298,126 @@ gpgParser s' | t == T.pack "strict" = Right GPGStrict
     --[ Completers ]--
     ------------------
 
+
+toolCompleter :: Completer
+toolCompleter = listCompleter ["ghc", "cabal", "hls", "stack"]
+
+gitFileUri :: [String] -> Completer
+gitFileUri add = mkCompleter $ fileUri' (["git://"] <> add)
+
+fileUri :: Completer
+fileUri = mkCompleter $ fileUri' []
+
+fileUri' :: [String] -> String -> IO [String]
+fileUri' add = \case
+  "" -> do
+    pwd <- getCurrentDirectory
+    pure $ ["https://", "http://", "file:///", "file://" <> pwd <> "/"] <> add
+  xs
+   | "file:///" `isPrefixOf` xs -> fmap ("file://" <>) <$>
+      case stripPrefix "file://" xs of
+        Nothing -> pure []
+        Just r ->  do
+          pwd <- getCurrentDirectory
+          dirs  <- compgen "directory" r ["-S", "/"]
+          files <- filter (\f -> (f <> "/") `notElem` dirs) <$> compgen "file" r []
+          pure (dirs <> files <> if r `isPrefixOf` pwd then [pwd <> "/"] else [])
+   | xs `isPrefixOf` "file:///" -> pure ["file:///"]
+   | xs `isPrefixOf` "https://" -> pure ["https://"]
+   | xs `isPrefixOf` "http://"  -> pure ["http://"]
+   | otherwise -> pure []
+ where
+  compgen :: String -> String -> [String] -> IO [String]
+  compgen action' r opts = do
+    let cmd = unwords $ ["compgen", "-A", action'] <> opts <> ["--", requote r]
+    result <- tryIO $ readProcess "bash" ["-c", cmd] ""
+    return . lines . either (const []) id $ result
+
+  -- | Strongly quote the string we pass to compgen.
+  --
+  -- We need to do this so bash doesn't expand out any ~ or other
+  -- chars we want to complete on, or emit an end of line error
+  -- when seeking the close to the quote.
+  -- 
+  -- NOTE: copied from https://hackage.haskell.org/package/optparse-applicative-0.17.0.0/docs/src/Options.Applicative.Builder.Completer.html#requote
+  requote :: String -> String
+  requote s =
+    let
+      -- Bash doesn't appear to allow "mixed" escaping
+      -- in bash completions. So we don't have to really
+      -- worry about people swapping between strong and
+      -- weak quotes.
+      unescaped =
+        case s of
+          -- It's already strongly quoted, so we
+          -- can use it mostly as is, but we must
+          -- ensure it's closed off at the end and
+          -- there's no single quotes in the
+          -- middle which might confuse bash.
+          ('\'': rs) -> unescapeN rs
+
+          -- We're weakly quoted.
+          ('"': rs)  -> unescapeD rs
+
+          -- We're not quoted at all.
+          -- We need to unescape some characters like
+          -- spaces and quotation marks.
+          elsewise   -> unescapeU elsewise
+    in
+      strong unescaped
+
+    where
+      strong ss = '\'' : foldr go "'" ss
+        where
+          -- If there's a single quote inside the
+          -- command: exit from the strong quote and
+          -- emit it the quote escaped, then resume.
+          go '\'' t = "'\\''" ++ t
+          go h t    = h : t
+
+      -- Unescape a strongly quoted string
+      -- We have two recursive functions, as we
+      -- can enter and exit the strong escaping.
+      unescapeN = goX
+        where
+          goX ('\'' : xs) = goN xs
+          goX (x : xs) = x : goX xs
+          goX [] = []
+
+          goN ('\\' : '\'' : xs) = '\'' : goN xs
+          goN ('\'' : xs) = goX xs
+          goN (x : xs) = x : goN xs
+          goN [] = []
+
+      -- Unescape an unquoted string
+      unescapeU = goX
+        where
+          goX [] = []
+          goX ('\\' : x : xs) = x : goX xs
+          goX (x : xs) = x : goX xs
+
+      -- Unescape a weakly quoted string
+      unescapeD = goX
+        where
+          -- Reached an escape character
+          goX ('\\' : x : xs)
+            -- If it's true escapable, strip the
+            -- slashes, as we're going to strong
+            -- escape instead.
+            | x `elem` ("$`\"\\\n" :: String) = x : goX xs
+            | otherwise = '\\' : x : goX xs
+          -- We've ended quoted section, so we
+          -- don't recurse on goX, it's done.
+          goX ('"' : xs)
+            = xs
+          -- Not done, but not a special character
+          -- just continue the fold.
+          goX (x : xs)
+            = x : goX xs
+          goX []
+            = []
+
+
 tagCompleter :: Tool -> [String] -> Completer
 tagCompleter tool add = listIOCompleter $ do
   dirs' <- liftIO getAllDirs
@@ -334,6 +475,150 @@ versionCompleter criteria tool = listIOCompleter $ do
       return $ T.unpack . prettyVer . lVer <$> installedVersions
 
 
+toolDlCompleter :: Tool -> Completer
+toolDlCompleter tool = mkCompleter $ \case
+  "" -> pure (initUrl tool <> ["https://", "http://", "file:///"])
+  word
+    | "file://" `isPrefixOf` word -> fileUri' [] word
+    -- downloads.haskell.org
+    | "https://downloads.haskell.org/" `isPrefixOf` word ->
+        fmap (completePrefix word) . prefixMatch (FP.takeFileName word) <$> fromHRef word
+
+    -- github releases
+    | "https://github.com/haskell/haskell-language-server/releases/download/" `isPrefixOf` word
+    , let xs = splitPath word
+    , (length xs == 6 && last word == '/') || (length xs == 7 && last word /= '/') ->
+        fmap (\x -> completePrefix word x <> "/") . prefixMatch (FP.takeFileName word) <$> getGithubReleases "haskell" "haskell-language-server"
+    | "https://github.com/commercialhaskell/stack/releases/download/" == word
+    , let xs = splitPath word
+    , (length xs == 6 && last word == '/') || (length xs == 7 && last word /= '/') ->
+        fmap (\x -> completePrefix word x <> "/") . prefixMatch (FP.takeFileName word) <$> getGithubReleases "commercialhaskell" "stack"
+
+    -- github release assets
+    | "https://github.com/haskell/haskell-language-server/releases/download/" `isPrefixOf` word
+    , let xs = splitPath word
+    , (length xs == 7 && last word == '/') || length xs == 8
+    , let rel = xs !! 6
+    , length rel > 1 -> do
+        fmap (completePrefix word) . prefixMatch (FP.takeFileName word) <$> getGithubAssets "haskell" "haskell-language-server" (init rel)
+    | "https://github.com/commercialhaskell/stack/releases/download/" `isPrefixOf` word
+    , let xs = splitPath word
+    , (length xs == 7 && last word == '/') || length xs == 8
+    , let rel = xs !! 6
+    , length rel > 1 -> do
+        fmap (completePrefix word) . prefixMatch (FP.takeFileName word) <$> getGithubAssets "commercialhaskell" "stack" (init rel)
+
+    -- github
+    | "https://github.com/c" `isPrefixOf` word -> pure ["https://github.com/commercialhaskell/stack/releases/download/"]
+    | "https://github.com/h" `isPrefixOf` word -> pure ["https://github.com/haskell/haskell-language-server/releases/download/"]
+    | "https://g" `isPrefixOf` word
+    , tool == Stack -> pure ["https://github.com/commercialhaskell/stack/releases/download/"]
+    | "https://g" `isPrefixOf` word
+    , tool == HLS -> pure ["https://github.com/haskell/haskell-language-server/releases/download/"]
+
+    | "https://d" `isPrefixOf` word -> pure $ filter ("https://downloads.haskell.org/" `isPrefixOf`) $ initUrl tool
+
+    | "h" `isPrefixOf` word -> pure $ initUrl tool
+
+    | word `isPrefixOf` "file:///" -> pure ["file:///"]
+    | word `isPrefixOf` "https://" -> pure ["https://"]
+    | word `isPrefixOf` "http://"  -> pure ["http://"]
+
+    | otherwise -> pure []
+ where
+  initUrl :: Tool -> [String]
+  initUrl GHC   = [ "https://downloads.haskell.org/~ghc/"
+                  , "https://downloads.haskell.org/~ghcup/unofficial-bindists/ghc/"
+                  ]
+  initUrl Cabal = [ "https://downloads.haskell.org/~cabal/"
+                  , "https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/"
+                  ]
+  initUrl GHCup = [ "https://downloads.haskell.org/~ghcup/" ]
+  initUrl HLS   = [ "https://github.com/haskell/haskell-language-server/releases/download/"
+                  , "https://downloads.haskell.org/~ghcup/unofficial-bindists/haskell-language-server/"
+                  ]
+  initUrl Stack = [ "https://github.com/commercialhaskell/stack/releases/download/"
+                  , "https://downloads.haskell.org/~ghcup/unofficial-bindists/stack/"
+                  ]
+
+  completePrefix :: String -- ^ url, e.g.    'https://github.com/haskell/haskell-languag'
+                 -> String -- ^ match, e.g.  'haskell-language-server'
+                 -> String -- ^ result, e.g. 'https://github.com/haskell/haskell-language-server'
+  completePrefix url match =
+    let base = FP.takeDirectory url
+        fn   = FP.takeFileName url
+    in if fn `isPrefixOf` match then base <> "/" <> match else url
+
+  prefixMatch :: String -> [String] -> [String]
+  prefixMatch pref = filter (pref `isPrefixOf`)
+
+  fromHRef :: String -> IO [String]
+  fromHRef url = withCurl (FP.takeDirectory url) 2_000_000 $ \stdout ->
+      pure
+        . fmap (T.unpack . decUTF8Safe' . fromAttrib "href")
+        . filter isTagOpen
+        . filter (~== ("<a href>" :: String))
+        . parseTags
+        $ stdout
+
+  withCurl :: String                      -- ^ url
+           -> Int                         -- ^ delay
+           -> (ByteString -> IO [String]) -- ^ callback
+           -> IO [String]
+  withCurl url delay cb = do
+    let limit = threadDelay delay
+    race limit (executeOut "curl" ["-fL", url] Nothing) >>= \case
+      Right (CapturedProcess {_exitCode, _stdOut}) -> do
+        case _exitCode of
+          ExitSuccess ->
+            (try @_ @SomeException . cb $ _stdOut) >>= \case
+              Left _ ->  pure []
+              Right r' -> do
+                r <- try @_ @SomeException
+                  . evaluate
+                  . force
+                  $ r'
+                either (\_ -> pure []) pure r
+          ExitFailure _ -> pure []
+      Left _ -> pure []
+
+  getGithubReleases :: String
+                    -> String
+                    -> IO [String]
+  getGithubReleases owner repo = withCurl url 3_000_000 $ \stdout -> do
+    Just xs <- pure $ decode' @Array stdout
+    fmap V.toList $ forM xs $ \x -> do
+      (Object r) <- pure x
+      Just (String name) <- pure $ KM.lookup (mkval "tag_name") r
+      pure $ T.unpack name
+   where
+    url = "https://api.github.com/repos/" <> owner <> "/" <> repo <> "/releases"
+
+  getGithubAssets :: String
+                  -> String
+                  -> String
+                  -> IO [String]
+  getGithubAssets owner repo tag = withCurl url 3_000_000 $ \stdout -> do
+    Just xs <- pure $ decode' @Object stdout
+    Just (Array assets) <- pure $ KM.lookup (mkval "assets") xs
+    as <- fmap V.toList $ forM assets $ \val -> do
+      (Object asset) <- pure val
+      Just (String name) <- pure $ KM.lookup (mkval "name") asset
+      pure $ T.unpack name
+    pure as
+   where
+    url = "https://api.github.com/repos/" <> owner <> "/" <> repo <> "/releases/tags/" <> tag
+
+
+#if MIN_VERSION_aeson(2,0,0)
+  mkval = KM.fromString
+#else
+  mkval = id
+#endif
+
+
+
+
 
 
     -----------------

app/ghcup/GHCup/OptParse/Compile.hs

@@ -165,6 +165,7 @@ ghcCompileOpts =
           )
           (short 'v' <> long "version" <> metavar "VERSION" <> help
             "The tool version to compile"
+            <> (completer $ versionCompleter Nothing GHC)
           )
           ) <|>
           (Right <$> (GitBranch <$> option
@@ -172,7 +173,10 @@ ghcCompileOpts =
           (short 'g' <> long "git-ref" <> metavar "GIT_REFERENCE" <> help
             "The git commit/branch/ref to build from"
           ) <*>
-          optional (option str (short 'r' <> long "repository" <> metavar "GIT_REPOSITORY" <> help "The git repository to build from (defaults to GHC upstream)"))
+          optional (option str (
+            short 'r' <> long "repository" <> metavar "GIT_REPOSITORY" <> help "The git repository to build from (defaults to GHC upstream)"
+            <> completer (gitFileUri ["https://gitlab.haskell.org/ghc/ghc.git"])
+            ))
           )))
     <*> option
           (eitherReader
@@ -185,12 +189,14 @@ ghcCompileOpts =
           <> metavar "BOOTSTRAP_GHC"
           <> help
                "The GHC version (or full path) to bootstrap with (must be installed)"
+          <> (completer $ versionCompleter Nothing GHC)
           )
     <*> optional
           (option
             (eitherReader (readEither @Int))
             (short 'j' <> long "jobs" <> metavar "JOBS" <> help
               "How many jobs to use for make"
+              <> (completer $ listCompleter $ fmap show ([1..12] :: [Int]))
             )
           )
     <*> optional
@@ -198,6 +204,7 @@ ghcCompileOpts =
             str
             (short 'c' <> long "config" <> metavar "CONFIG" <> help
               "Absolute path to build config file"
+             <> completer (bashCompleter "file")
             )
           )
     <*> (optional
@@ -206,6 +213,7 @@ ghcCompileOpts =
               (eitherReader uriParser)
               (long "patch" <> metavar "PATCH_URI" <> help
                 "URI to a patch (https/http/file)"
+               <> completer fileUri
               )
             )
             <|>
@@ -213,6 +221,7 @@ ghcCompileOpts =
               str
               (short 'p' <> long "patchdir" <> metavar "PATCH_DIR" <> help
                 "Absolute path to patch directory (applies all .patch and .diff files in order using -p1. This order is determined by a quilt series file if it exists, or the patches are lexicographically ordered)"
+               <> completer (bashCompleter "directory")
               )
             )
           )
@@ -225,12 +234,7 @@ ghcCompileOpts =
             )
           )
     <*> many (argument str (metavar "CONFIGURE_ARGS" <> help "Additional arguments to configure, prefix with '-- ' (longopts)"))
-    <*> flag
+    <*> fmap (fromMaybe False) (invertableSwitch "set" Nothing False (help "Set as active version after install"))
-          False
-          True
-          (long "set" <> help
-            "Set as active version after install"
-          )
     <*> optional
           (option
             (eitherReader
@@ -238,6 +242,7 @@ ghcCompileOpts =
             )
             (short 'o' <> long "overwrite-version" <> metavar "OVERWRITE_VERSION" <> help
               "Allows to overwrite the finally installed VERSION with a different one, e.g. when you build 8.10.4 with your own patches, you might want to set this to '8.10.4-p1'"
+            <> (completer $ versionCompleter Nothing GHC)
             )
           )
     <*> optional
@@ -257,6 +262,7 @@ ghcCompileOpts =
             <> long "isolate"
             <> metavar "DIR"
             <> help "install in an isolated directory instead of the default one, no symlinks to this installation will be made"
+            <> completer (bashCompleter "directory")
             )
            )
 
@@ -269,6 +275,7 @@ hlsCompileOpts =
           )
           (short 'v' <> long "version" <> metavar "VERSION" <> help
             "The tool version to compile"
+            <> (completer $ versionCompleter Nothing HLS)
           )
           ) <|>
           (Right <$> (GitBranch <$> option
@@ -276,21 +283,19 @@ hlsCompileOpts =
           (short 'g' <> long "git-ref" <> metavar "GIT_REFERENCE" <> help
             "The git commit/branch/ref to build from"
           ) <*>
-          optional (option str (short 'r' <> long "repository" <> metavar "GIT_REPOSITORY" <> help "The git repository to build from (defaults to GHC upstream)"))
+          optional (option str (short 'r' <> long "repository" <> metavar "GIT_REPOSITORY" <> help "The git repository to build from (defaults to GHC upstream)"
+            <> completer (gitFileUri ["https://github.com/haskell/haskell-language-server.git"])
+          ))
           )))
     <*> optional
           (option
             (eitherReader (readEither @Int))
             (short 'j' <> long "jobs" <> metavar "JOBS" <> help
               "How many jobs to use for make"
+              <> (completer $ listCompleter $ fmap show ([1..12] :: [Int]))
             )
           )
-    <*> flag
+    <*> fmap (fromMaybe True) (invertableSwitch "set" Nothing True (help "Don't set as active version after install"))
-          False
-          True
-          (long "set" <> help
-            "Set as active version after install"
-          )
     <*> optional
           (option
             (eitherReader
@@ -298,6 +303,7 @@ hlsCompileOpts =
             )
             (short 'o' <> long "overwrite-version" <> metavar "OVERWRITE_VERSION" <> help
               "Allows to overwrite the finally installed VERSION with a different one, e.g. when you build 8.10.4 with your own patches, you might want to set this to '8.10.4-p1'"
+            <> (completer $ versionCompleter Nothing HLS)
             )
           )
     <*> optional
@@ -307,6 +313,7 @@ hlsCompileOpts =
             <> long "isolate"
             <> metavar "DIR"
             <> help "install in an isolated directory instead of the default one, no symlinks to this installation will be made"
+            <> completer (bashCompleter "directory")
             )
            )
     <*> optional
@@ -314,6 +321,7 @@ hlsCompileOpts =
             ((fmap Right $ eitherReader uriParser) <|> (fmap Left str))
             (long "cabal-project" <> metavar "CABAL_PROJECT" <> help
               "If relative filepath, specifies the path to cabal.project inside the unpacked HLS tarball/checkout. Otherwise expects a full URI with https/http/file scheme."
+              <> completer fileUri
             )
           )
     <*> optional
@@ -321,6 +329,7 @@ hlsCompileOpts =
             (eitherReader uriParser)
             (long "cabal-project-local" <> metavar "CABAL_PROJECT_LOCAL" <> help
               "URI (https/http/file) to a cabal.project.local to be used for the build. Will be copied over."
+              <> completer fileUri
             )
           )
     <*> (optional
@@ -329,6 +338,7 @@ hlsCompileOpts =
               (eitherReader uriParser)
               (long "patch" <> metavar "PATCH_URI" <> help
                 "URI to a patch (https/http/file)"
+              <> completer fileUri
               )
             )
             <|>
@@ -336,6 +346,7 @@ hlsCompileOpts =
               str
               (short 'p' <> long "patchdir" <> metavar "PATCH_DIR" <> help
                 "Absolute path to patch directory (applies all .patch and .diff files in order using -p1)"
+              <> completer (bashCompleter "directory")
               )
             )
           )

app/ghcup/GHCup/OptParse/Install.hs

@@ -6,6 +6,7 @@
 {-# LANGUAGE QuasiQuotes       #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE ViewPatterns      #-}
 
 module GHCup.OptParse.Install where
 
@@ -189,18 +190,15 @@ installOpts tool =
                     (eitherReader uriParser)
                     (short 'u' <> long "url" <> metavar "BINDIST_URL" <> help
                       "Install the specified version from this bindist"
+                      <> completer (toolDlCompleter (fromMaybe GHC tool))
                     )
                   )
             <*> (Just <$> toolVersionArgument Nothing tool)
             )
         <|> pure (Nothing, Nothing)
         )
-    <*> flag
+    <*> fmap (fromMaybe setDefault) (invertableSwitch "set" Nothing setDefault
-          False
+      (help $ if not setDefault then "Set as active version after install" else "Don't set as active version after install"))
-          True
-          (long "set" <> help
-            "Set as active version after install"
-          )
     <*> optional
           (option
            (eitherReader isolateParser)
@@ -208,10 +206,16 @@ installOpts tool =
            <> long "isolate"
            <> metavar "DIR"
            <> help "install in an isolated dir instead of the default one"
+           <> completer (bashCompleter "directory")
            )
           )
     <*> switch
           (short 'f' <> long "force" <> help "Force install")
+ where
+  setDefault = case tool of
+    Nothing  -> False
+    Just GHC -> False
+    Just _   -> True
           
 
 
@@ -253,6 +257,48 @@ type InstallEffects = '[ AlreadyInstalled
                        , NoToolVersionSet
                        , FileAlreadyExistsError
                        , ProcessError
+
+                       , (AlreadyInstalled, ())
+                       , (UnknownArchive, ())
+                       , (ArchiveResult, ())
+                       , (FileDoesNotExistError, ())
+                       , (CopyError, ())
+                       , (NotInstalled, ())
+                       , (DirNotEmpty, ())
+                       , (NoDownload, ())
+                       , (NotInstalled, ())
+                       , (BuildFailed, ())
+                       , (TagNotFound, ())
+                       , (DigestError, ())
+                       , (GPGError, ())
+                       , (DownloadFailed, ())
+                       , (TarDirDoesNotExist, ())
+                       , (NextVerNotFound, ())
+                       , (NoToolVersionSet, ())
+                       , (FileAlreadyExistsError, ())
+                       , (ProcessError, ())
+
+                       , (AlreadyInstalled, NotInstalled)
+                       , (UnknownArchive, NotInstalled)
+                       , (ArchiveResult, NotInstalled)
+                       , (FileDoesNotExistError, NotInstalled)
+                       , (CopyError, NotInstalled)
+                       , (NotInstalled, NotInstalled)
+                       , (DirNotEmpty, NotInstalled)
+                       , (NoDownload, NotInstalled)
+                       , (NotInstalled, NotInstalled)
+                       , (BuildFailed, NotInstalled)
+                       , (TagNotFound, NotInstalled)
+                       , (DigestError, NotInstalled)
+                       , (GPGError, NotInstalled)
+                       , (DownloadFailed, NotInstalled)
+                       , (TarDirDoesNotExist, NotInstalled)
+                       , (NextVerNotFound, NotInstalled)
+                       , (NoToolVersionSet, NotInstalled)
+                       , (FileAlreadyExistsError, NotInstalled)
+                       , (ProcessError, NotInstalled)
+
+                       , ((), NotInstalled)
                        ]
 
 
@@ -352,7 +398,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                      isolateDir
                      forceInstall
                    )
-                   $ when instSet $ void $ setGHC v SetGHCOnly Nothing
+                   $ when instSet $ when (isNothing isolateDir) $ void $ setGHC v SetGHCOnly Nothing
          pure vi
        Just uri -> do
          runInstGHC s'{ settings = settings {noVerify = True}} instPlatform $ do
@@ -363,7 +409,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                        isolateDir
                        forceInstall
                      )
-                     $ when instSet $ void $ setGHC v SetGHCOnly Nothing
+                     $ when instSet $ when (isNothing isolateDir) $ void $ setGHC v SetGHCOnly Nothing
            pure vi
       )
         >>= \case
@@ -418,20 +464,22 @@ install installCommand settings getAppState' runLogger = case installCommand of
     s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
     (case instBindist of
        Nothing -> runInstTool s' instPlatform $ do
-         (v, vi) <- liftE $ fromVersion instVer Cabal
+         (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Cabal
-         liftE $ installCabalBin
+         void $ liftE $ sequenceE (installCabalBin
-                   (_tvVersion v)
+                                    v
-                   isolateDir
+                                    isolateDir
-                   forceInstall
+                                    forceInstall
+                                  ) $ when instSet $ when (isNothing isolateDir) $ void $ setCabal v
          pure vi
        Just uri -> do
          runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
-           (v, vi) <- liftE $ fromVersion instVer Cabal
+           (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Cabal
-           liftE $ installCabalBindist 
+           void $ liftE $ sequenceE (installCabalBindist
-                     (DownloadInfo uri Nothing "")
+                                      (DownloadInfo uri Nothing "")
-                     (_tvVersion v)
+                                      v
-                     isolateDir
+                                      isolateDir
-                     forceInstall
+                                      forceInstall
+                                    ) $ when instSet $ when (isNothing isolateDir) $ void $ setCabal v
            pure vi
       )
       >>= \case
@@ -448,6 +496,14 @@ install installCommand settings getAppState' runLogger = case installCommand of
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install cabal --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
+            VLeft (V (AlreadyInstalled _ v, ())) -> do
+              runLogger $ logWarn $
+                "Cabal ver " <> prettyVer v <> " already installed; if you really want to reinstall it, you may want to run 'ghcup install cabal --force " <> prettyVer v <> "'"
+              pure ExitSuccess
+            VLeft (V (FileAlreadyExistsError fp, ())) -> do
+              runLogger $ logWarn $
+                "File " <> T.pack fp <> " already exists. Use 'ghcup install cabal --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
+              pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
                 logError $ T.pack $ prettyShow e
@@ -459,21 +515,23 @@ install installCommand settings getAppState' runLogger = case installCommand of
      s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
      (case instBindist of
        Nothing -> runInstTool s' instPlatform $ do
-         (v, vi) <- liftE $ fromVersion instVer HLS
+         (_tvVersion -> v, vi) <- liftE $ fromVersion instVer HLS
-         liftE $ installHLSBin
+         void $ liftE $ sequenceE (installHLSBin
-                   (_tvVersion v)
+                                    v
-                   isolateDir
+                                    isolateDir
-                   forceInstall
+                                    forceInstall
+                                  ) $ when instSet $ when (isNothing isolateDir) $ void $ setHLS v SetHLSOnly Nothing
          pure vi
        Just uri -> do
          runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
-           (v, vi) <- liftE $ fromVersion instVer HLS
+           (_tvVersion -> v, vi) <- liftE $ fromVersion instVer HLS
            -- TODO: support legacy
-           liftE $ installHLSBindist
+           void $ liftE $ sequenceE (installHLSBindist
-                     (DownloadInfo uri (Just $ RegexDir "haskell-language-server-*") "")
+                                      (DownloadInfo uri (Just $ RegexDir "haskell-language-server-*") "")
-                     (_tvVersion v)
+                                      v
-                     isolateDir
+                                      isolateDir
-                     forceInstall
+                                      forceInstall
+                                    ) $ when instSet $ when (isNothing isolateDir) $ void $ setHLS v SetHLSOnly Nothing
            pure vi
       )
       >>= \case
@@ -494,6 +552,18 @@ install installCommand settings getAppState' runLogger = case installCommand of
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install hls --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
+            VLeft (V (AlreadyInstalled _ v, ())) -> do
+              runLogger $ logWarn $
+                  "HLS ver "
+                <> prettyVer v
+                <> " already installed; if you really want to reinstall it, you may want to run 'ghcup install hls --force "
+                <> prettyVer v
+                <> "'"
+              pure ExitSuccess
+            VLeft (V (FileAlreadyExistsError fp, ())) -> do
+              runLogger $ logWarn $
+                "File " <> T.pack fp <> " already exists. Use 'ghcup install hls --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
+              pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
                 logError $ T.pack $ prettyShow e
@@ -505,20 +575,22 @@ install installCommand settings getAppState' runLogger = case installCommand of
      s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
      (case instBindist of
         Nothing -> runInstTool s' instPlatform $ do
-          (v, vi) <- liftE $ fromVersion instVer Stack
+          (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Stack
-          liftE $ installStackBin
+          void $ liftE $ sequenceE (installStackBin
-                    (_tvVersion v)
+                                     v
-                    isolateDir
+                                     isolateDir
-                    forceInstall
+                                     forceInstall
+                                   ) $ when instSet $ when (isNothing isolateDir) $ void $ setStack v
           pure vi
         Just uri -> do
           runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
-            (v, vi) <- liftE $ fromVersion instVer Stack
+            (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Stack
-            liftE $ installStackBindist
+            void $ liftE $ sequenceE (installStackBindist
-                      (DownloadInfo uri Nothing "")
+                                       (DownloadInfo uri Nothing "")
-                      (_tvVersion v)
+                                       v
-                      isolateDir
+                                       isolateDir
-                      forceInstall
+                                       forceInstall
+                                     ) $ when instSet $ when (isNothing isolateDir) $ void $ setStack v
             pure vi
       )
       >>= \case
@@ -535,6 +607,14 @@ install installCommand settings getAppState' runLogger = case installCommand of
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install stack --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
+            VLeft (V (AlreadyInstalled _ v, ())) -> do
+              runLogger $ logWarn $
+                "Stack ver " <> prettyVer v <> " already installed; if you really want to reinstall it, you may want to run 'ghcup install stack --force " <> prettyVer v <> "'"
+              pure ExitSuccess
+            VLeft (V (FileAlreadyExistsError fp, ())) -> do
+              runLogger $ logWarn $
+                "File " <> T.pack fp <> " already exists. Use 'ghcup install stack --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
+              pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
                 logError $ T.pack $ prettyShow e

app/ghcup/GHCup/OptParse/List.hs

@@ -69,6 +69,7 @@ listOpts =
             (eitherReader toolParser)
             (short 't' <> long "tool" <> metavar "<ghc|cabal|hls|stack>" <> help
               "Tool to list versions for. Default is all"
+              <> completer (toolCompleter)
             )
           )
     <*> optional
@@ -78,6 +79,7 @@ listOpts =
             <> long "show-criteria"
             <> metavar "<installed|set|available>"
             <> help "Show only installed/set/available tool versions"
+              <> completer (listCompleter ["installed", "set", "available"])
             )
           )
     <*> switch

app/ghcup/GHCup/OptParse/Prefetch.hs

@@ -83,7 +83,7 @@ prefetchP = subparser
         (PrefetchGHC
           <$> (PrefetchGHCOptions
                 <$> ( switch (short 's' <> long "source" <> help "Download source tarball instead of bindist") <**> helper )
-                <*> optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)")))
+                <*> optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)" <> completer (bashCompleter "directory"))))
           <*>  optional (toolVersionArgument Nothing (Just GHC)) )
         ( progDesc "Download GHC assets for installation")
       )
@@ -92,7 +92,7 @@ prefetchP = subparser
       "cabal"
       (info 
         (PrefetchCabal
-          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)")))
+          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)" <> completer (bashCompleter "directory"))))
           <*> ( optional (toolVersionArgument Nothing (Just Cabal)) <**> helper ))
         ( progDesc "Download cabal assets for installation")
       )
@@ -101,7 +101,7 @@ prefetchP = subparser
       "hls"
       (info 
         (PrefetchHLS
-          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)")))
+          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)" <> completer (bashCompleter "directory"))))
           <*> ( optional (toolVersionArgument Nothing (Just HLS)) <**> helper ))
         ( progDesc "Download HLS assets for installation")
       )
@@ -110,7 +110,7 @@ prefetchP = subparser
       "stack"
       (info 
         (PrefetchStack
-          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)")))
+          <$> fmap PrefetchOptions (optional (option str (short 'd' <> long "directory" <> help "directory to download into (default: ~/.ghcup/cache/)" <> completer (bashCompleter "directory"))))
           <*> ( optional (toolVersionArgument Nothing (Just Stack)) <**> helper ))
         ( progDesc "Download stack assets for installation")
       )

app/ghcup/GHCup/OptParse/Run.hs

@@ -72,6 +72,7 @@ data RunOptions = RunOptions
     ---------------
 
           
+    
 runOpts :: Parser RunOptions
 runOpts =
   RunOptions
@@ -82,22 +83,34 @@ runOpts =
     <*> optional
           (option
             (eitherReader toolVersionEither)
-            (metavar "GHC_VERSION" <> long "ghc" <> help "The ghc version")
+            (metavar "GHC_VERSION" <> long "ghc" <> help "The ghc version"
+            <> completer (tagCompleter GHC [])
+            <> (completer $ versionCompleter Nothing GHC)
+            )
           )
     <*> optional
           (option
             (eitherReader toolVersionEither)
-            (metavar "CABAL_VERSION" <> long "cabal" <> help "The cabal version")
+            (metavar "CABAL_VERSION" <> long "cabal" <> help "The cabal version"
+            <> completer (tagCompleter Cabal [])
+            <> (completer $ versionCompleter Nothing Cabal)
+            )
           )
     <*> optional
           (option
             (eitherReader toolVersionEither)
-            (metavar "HLS_VERSION" <> long "hls" <> help "The HLS version")
+            (metavar "HLS_VERSION" <> long "hls" <> help "The HLS version"
+            <> completer (tagCompleter HLS [])
+            <> (completer $ versionCompleter Nothing HLS)
+            )
           )
     <*> optional
           (option
             (eitherReader toolVersionEither)
-            (metavar "STACK_VERSION" <> long "stack" <> help "The stack version")
+            (metavar "STACK_VERSION" <> long "stack" <> help "The stack version"
+            <> completer (tagCompleter Stack [])
+            <> (completer $ versionCompleter Nothing Stack)
+            )
           )
     <*> optional
           (option
@@ -106,6 +119,7 @@ runOpts =
            <> long "bindir"
            <> metavar "DIR"
            <> help "directory where to create the tool symlinks (default: newly created system temp dir)"
+           <> completer (bashCompleter "directory")
            )
           )
     <*> many (argument str (metavar "COMMAND" <> help "The command to run, with arguments (use longopts --). If omitted, just prints the created bin/ dir to stdout and exits."))
@@ -324,7 +338,7 @@ run RunOptions{..} runAppState leanAppstate runLogger = do
           if legacy
           then do
             -- TODO: factor this out
-            (Just hlsWrapper) <- hlsWrapperBinary v'
+            hlsWrapper <- liftE @_ @'[NotInstalled] $ hlsWrapperBinary v' !? (NotInstalled HLS (mkTVer v'))
             cw <- liftIO $ canonicalizePath (binDir </> hlsWrapper)
             lift $ createLink (relativeSymlink tmp cw) (tmp </> takeFileName cw)
             hlsBins <- hlsServerBinaries v' Nothing >>= liftIO . traverse (canonicalizePath . (binDir </>))

app/ghcup/GHCup/OptParse/Upgrade.hs

@@ -72,6 +72,7 @@ upgradeOptsP =
               str
               (short 't' <> long "target" <> metavar "TARGET_DIR" <> help
                 "Absolute filepath to write ghcup into"
+                <> completer (bashCompleter "file")
               )
         )
     <|> pure UpgradeGHCupDir

docs/css/extra.css

@@ -1,5 +1,8 @@
 :root {
   --theme-purple: #5E5184;
+  --theme-purple-dark: rgba(69, 59, 97, 0.5);
+  --ukraine-top: #0057B8;
+  --ukraine-bottom: #FFD700;
   --link-pink: #9E358F;
 }
 
@@ -108,12 +111,12 @@ body.homepage>div.container div.col-md-9 {
 
 .bg-primary {
   background-image: none;
-  background-color: var(--theme-purple) !important;
+  background-color: var(--ukraine-top) !important;
 }
 
 body .bg-primary {
   background-image: none;
-  background-color: var(--theme-purple);
+  background-color: var(--ukraine-top);
   border: 0px;
 }
 
@@ -125,8 +128,8 @@ body .btn-primary {
 
 .navbar.fixed-top {
   background-image: none;
-  background-color: var(--theme-purple);
+  background-color: var(--ukraine-top);
-  border-bottom: 5px solid rgba(69, 59, 97, 0.5);
+  border-bottom: 40px solid var(--ukraine-bottom);
   padding: 0px;
 }
 

docs/install.md

@@ -50,10 +50,90 @@ On windows, double-click on the `Uninstall Haskell.ps1` PowerShell script on you
 
 GHCup supports the following tools, which are also known as the **Haskell Toolchain**:
 
-1. [GHC](https://www.haskell.org/ghc/)
+<details>
-2. [cabal-install](https://cabal.readthedocs.io/en/stable/)
+  <summary>Show all supported <a href='https://www.haskell.org/ghc/'>GHC</a> versions</summary>
-3. [haskell-language-server](https://haskell-language-server.readthedocs.io/en/stable/)
+  
-4. [stack](https://docs.haskellstack.org/en/stable/README/)
+<table>
+<thead><tr><th>GHC Version</th><th>Tags</th></tr></thead>
+<tbody>
+<tr><td>7.10.3</td><td>base-4.8.2.0</td></tr>
+<tr><td>8.0.2</td><td>base-4.9.1.0</td></tr>
+<tr><td>8.2.2</td><td>base-4.10.1.0</td></tr>
+<tr><td>8.4.1</td><td>base-4.11.0.0</td></tr>
+<tr><td>8.4.2</td><td>base-4.11.1.0</td></tr>
+<tr><td>8.4.3</td><td>base-4.11.1.0</td></tr>
+<tr><td>8.4.4</td><td>base-4.11.1.0</td></tr>
+<tr><td>8.6.1</td><td>base-4.12.0.0</td></tr>
+<tr><td>8.6.2</td><td>base-4.12.0.0</td></tr>
+<tr><td>8.6.3</td><td>base-4.12.0.0</td></tr>
+<tr><td>8.6.4</td><td>base-4.12.0.0</td></tr>
+<tr><td>8.6.5</td><td>base-4.12.0.0</td></tr>
+<tr><td>8.8.1</td><td>base-4.13.0.0</td></tr>
+<tr><td>8.8.2</td><td>base-4.13.0.0</td></tr>
+<tr><td>8.8.3</td><td>base-4.13.0.0</td></tr>
+<tr><td>8.8.4</td><td>base-4.13.0.0</td></tr>
+<tr><td>8.10.1</td><td>base-4.14.0.0</td></tr>
+<tr><td>8.10.2</td><td>base-4.14.1.0</td></tr>
+<tr><td>8.10.3</td><td>base-4.14.1.0</td></tr>
+<tr><td>8.10.4</td><td>base-4.14.1.0</td></tr>
+<tr><td>8.10.5</td><td>base-4.14.2.0</td></tr>
+<tr><td>8.10.6</td><td>base-4.14.3.0</td></tr>
+<tr><td>8.10.7</td><td><span style="color:green">recommended</span>, base-4.14.3.0</td></tr>
+<tr><td>9.0.1</td><td>base-4.15.0.0</td></tr>
+<tr><td>9.0.2</td><td>base-4.15.1.0</td></tr>
+<tr><td>9.2.1</td><td>base-4.16.0.0</td></tr>
+<tr><td>9.2.2</td><td><span style="color:blue">latest</span>, base-4.16.1.0</td></tr>
+</tbody>
+</table>
+
+</details>
+
+<details>
+  <summary>Show all supported <a href='https://cabal.readthedocs.io/en/stable/'>cabal-install</a> versions</summary>
+  <table>
+<thead><tr><th>Cabal Version</th><th>Tags</th></tr></thead>
+<tbody>
+<tr><td>2.4.1.0</td><td></td></tr>
+<tr><td>3.0.0.0</td><td></td></tr>
+<tr><td>3.2.0.0</td><td></td></tr>
+<tr><td>3.4.0.0</td><td></td></tr>
+<tr><td>3.4.1.0</td><td></td></tr>
+<tr><td>3.6.0.0</td><td></td></tr>
+<tr><td>3.6.2.0</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+</tbody>
+</table>
+
+</details>
+
+<details>
+  <summary>Show all supported <a href='https://haskell-language-server.readthedocs.io/en/stable/'>HLS</a> versions</summary>
+<table>
+<thead><tr><th>HLS Version</th><th>Tags</th></tr></thead>
+<tbody>
+<tr><td>1.1.0</td><td></td></tr>
+<tr><td>1.2.0</td><td></td></tr>
+<tr><td>1.3.0</td><td></td></tr>
+<tr><td>1.4.0</td><td></td></tr>
+<tr><td>1.5.0</td><td></td></tr>
+<tr><td>1.5.1</td><td></td></tr>
+<tr><td>1.6.0.0</td><td></td></tr>
+<tr><td>1.6.1.0</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+</tbody>
+</table>
+</details>
+
+<details>
+  <summary>Show all supported <a href='https://docs.haskellstack.org/en/stable/README/'>Stack</a> versions</summary>
+<table>
+<thead><tr><th>Stack Version</th><th>Tags</th></tr></thead>
+<tbody>
+<tr><td>2.5.1</td><td></td></tr>
+<tr><td>2.7.1</td><td></td></tr>
+<tr><td>2.7.3</td><td></td></tr>
+<tr><td>2.7.5</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+</tbody>
+</table>
+</details>
 
 ## Supported platforms
 

ghcup.cabal

@@ -121,7 +121,7 @@ library
     , haskus-utils-variant  ^>=3.2.1
     , libarchive            ^>=3.0.3.0
     , lzma-static           ^>=5.2.5.3
-    , megaparsec            >=8.0.0      && <9.1
+    , megaparsec            >=8.0.0      && <9.3
     , mtl                   ^>=2.2
     , optics                ^>=0.4
     , os-release            ^>=1.0.0
@@ -236,19 +236,23 @@ executable ghcup
     , ghcup
     , haskus-utils-variant  ^>=3.2.1
     , libarchive            ^>=3.0.3.0
-    , megaparsec            >=8.0.0    && <9.1
+    , megaparsec            >=8.0.0    && <9.3
     , mtl                   ^>=2.2
-    , optparse-applicative  >=0.15.1.0 && <0.17
+    , optparse-applicative  >=0.15.1.0 && <0.18
     , pretty                ^>=1.1.3.1
     , pretty-terminal       ^>=0.1.0.0
+    , process               ^>=1.6.11.0
     , resourcet             ^>=1.2.2
     , safe                  ^>=0.3.18
     , safe-exceptions       ^>=0.1
-    , temporary             ^>=1.3
+    , tagsoup               ^>=0.14
     , template-haskell      >=2.7      && <2.18
+    , temporary             ^>=1.3
     , text                  ^>=1.2.4.0
+    , unordered-containers  ^>=0.2
     , uri-bytestring        ^>=0.3.2.2
     , utf8-string           ^>=1.0
+    , vector                ^>=0.12
     , versions              >=4.0.1    && <5.1
     , yaml-streamly         ^>=0.12.0
 
@@ -262,23 +266,22 @@ executable ghcup
       , brick         ^>=0.64
       , transformers  ^>=0.5
       , unix          ^>=2.7
-      , vector        ^>=0.12
       , vty           >=5.28.2 && <5.34
 
   if os(windows)
     cpp-options: -DIS_WINDOWS
+
   else
-    build-depends:
+    build-depends: unix ^>=2.7
-      , unix             ^>=2.7
 
   if flag(no-exe)
     buildable: False
 
-  if (flag(disable-upgrade))
+  if flag(disable-upgrade)
-    cpp-options:   -DDISABLE_UPGRADE
+    cpp-options: -DDISABLE_UPGRADE
+
   else
-    other-modules:
+    other-modules: GHCup.OptParse.Upgrade
-        GHCup.OptParse.Upgrade
 
 test-suite ghcup-test
   type:               exitcode-stdio-1.0
@@ -307,9 +310,9 @@ test-suite ghcup-test
     , base                      >=4.12    && <5
     , bytestring                ^>=0.10
     , containers                ^>=0.6
-    , generic-arbitrary         ^>=0.1.0
+    , generic-arbitrary         >=0.1.0   && <0.3
     , ghcup
-    , hspec                     ^>=2.7.10
+    , hspec                     >=2.7.10  && <2.10
     , hspec-golden-aeson        ^>=0.9
     , QuickCheck                ^>=2.14.1
     , quickcheck-arbitrary-adt  ^>=0.3.1.0

lib/GHCup.hs

@@ -468,10 +468,6 @@ installCabalBindist dlinfo ver isoFilepath forceInstall = do
     Nothing -> do                 -- regular install
       liftE $ installCabalUnpacked workdir binDir (Just ver) forceInstall
 
-      -- create symlink if this is the latest version for regular installs
-      cVers <- lift $ fmap rights getInstalledCabals
-      let lInstCabal = headMay . reverse . sort $ cVers
-      when (maybe True (ver >=) lInstCabal) $ liftE $ setCabal ver
       
 -- | Install an unpacked cabal distribution.Symbol
 installCabalUnpacked :: (MonadCatch m, HasLog env, MonadIO m, MonadReader env m)
@@ -626,7 +622,6 @@ installHLSBindist dlinfo ver isoFilepath forceInstall = do
         liftE $ runBuildAction tmpUnpack Nothing $ installHLSUnpacked workdir inst ver
         liftE $ setHLS ver SetHLS_XYZ Nothing
 
-  liftE $ installHLSPostInst isoFilepath ver
 
 isLegacyHLSBindist :: FilePath -- ^ Path to the unpacked hls bindist
                    -> IO Bool
@@ -696,19 +691,6 @@ installHLSUnpackedLegacy path inst mver' forceInstall = do
   lift $ chmod_755 destWrapperPath
 
 
-installHLSPostInst :: (MonadReader env m, HasDirs env, HasLog env, MonadIO m, MonadCatch m, MonadMask m, MonadFail m, MonadUnliftIO m)
-                   => Maybe FilePath
-                   -> Version
-                   -> Excepts '[NotInstalled] m ()
-installHLSPostInst isoFilepath ver = 
-  case isoFilepath of
-    Just _ -> pure ()
-    Nothing -> do
-      -- create symlink if this is the latest version in a regular install
-      hlsVers <- lift $ fmap rights getInstalledHLSs
-      let lInstHLS = headMay . reverse . sort $ hlsVers
-      when (maybe True (ver >=) lInstHLS) $ liftE $ setHLS ver SetHLSOnly Nothing
-
 
 -- | Installs hls binaries @haskell-language-server-\<ghcver\>@
 -- into @~\/.ghcup\/bin/@, as well as @haskell-languager-server-wrapper@.
@@ -916,8 +898,6 @@ compileHLS targetHLS ghcs jobs ov isolateDir cabalProject cabalProjectLocal patc
           liftE $ installHLSUnpackedLegacy installDir binDir (Just installVer) True
     )
 
-  liftE $ installHLSPostInst isolateDir installVer
-
   pure installVer
 
 
@@ -1034,11 +1014,6 @@ installStackBindist dlinfo ver isoFilepath forceInstall = do
     Nothing -> do                     -- regular install
       liftE $ installStackUnpacked workdir binDir (Just ver) forceInstall
 
-      -- create symlink if this is the latest version and a regular install
-      sVers <- lift $ fmap rights getInstalledStacks
-      let lInstStack = headMay . reverse . sort $ sVers
-      when (maybe True (ver >=) lInstStack) $ liftE $ setStack ver
-
 
 -- | Install an unpacked stack distribution.
 installStackUnpacked :: (MonadReader env m, HasLog env, MonadCatch m, MonadIO m)

stack.yaml

@@ -1,4 +1,4 @@
-resolver: lts-18.25
+resolver: lts-18.27
 
 packages:
   - .
@@ -16,6 +16,7 @@ extra-deps:
   - composition-prelude-3.0.0.2@sha256:1ffed216bd28d810fce0b5be83a661e2a892696d73b3f8de5c0f5edb9b5f0090,1216
   - haskus-utils-data-1.4@sha256:bfa94363b94b14779edd6834fbd59dbb847c3d7b8f48e3844f456ffdc077da4a,1466
   - haskus-utils-types-1.5.1@sha256:991c472f4e751e2f0d7aab6ad4220ef151d6160876dcf0511bbf876bbd432020,1298
+  - haskus-utils-variant-3.2.1@sha256:791f4cf1e786eb578f4d37aef60986641f84c36e130164321f7d01542584066a,2200
   - heaps-0.3.6.1@sha256:7928b759ca5180d35722c45948c0bde264229f3c99c1888188a3d9285f13d3d2,1340
   - hpath-filepath-0.10.4@sha256:e9e44fb5fdbade7f30b5b5451257dbee15b6ef1aae4060034d73008bb3b5d878,1269
   - hpath-posix-0.13.3@sha256:abe472cf16bccd3a8b8814865ed3551a728fde0f3a2baea2acc03023bec6c565,1615
@@ -39,11 +40,6 @@ extra-deps:
   - xor-0.0.1.0@sha256:f8362b4a68562b9afbcd727ff64c1a303970df3a032e0033d2f4c094c3501df3,2243
   - yaml-streamly-0.12.0
 
-  - git: https://github.com/hasufell/packages.git
-    commit: cc0b4688f8bb374fa92f17c856949de795b56291
-    subdirs:
-      - haskus-utils-variant
-
 flags:
   http-io-streams:
     brotli: false