List all available plugins (#2139)

* List all available plugins

* Make hlint happy

Co-authored-by: Javier Neira <atreyu.bbb@gmail.com>

src/Ide/Arguments.hs

@@ -30,6 +30,7 @@ import           System.Environment
 data Arguments
   = VersionMode PrintVersion
   | ProbeToolsMode
+  | ListPluginsMode
   | BiosMode BiosAction
   | Ghcide GhcideArguments
   | VSCodeExtensionSchemaMode
@@ -64,6 +65,7 @@ getArguments exeName plugins = execParser opts
     opts = info ((
       VersionMode <$> printVersionParser exeName
       <|> probeToolsParser exeName
+      <|> listPluginsParser
       <|> BiosMode <$> biosParser
       <|> Ghcide <$> arguments plugins
       )
@@ -90,6 +92,11 @@ probeToolsParser exeName =
   flag' ProbeToolsMode
     (long "probe-tools" <> help ("Show " ++ exeName  ++ " version and other tools of interest"))
 
+listPluginsParser :: Parser Arguments
+listPluginsParser =
+  flag' ListPluginsMode
+    (long "list-plugins" <> help "List all avaliable plugins")
+
 arguments :: IdePlugins IdeState -> Parser GhcideArguments
 arguments plugins = GhcideArguments
       <$> (commandP plugins <|> lspCommand <|> checkCommand)

src/Ide/Main.hs

@@ -13,6 +13,7 @@ import           Control.Monad.Extra
 import qualified Data.Aeson.Encode.Pretty      as A
 import qualified Data.ByteString.Lazy.Char8    as LBS
 import           Data.Default
+import           Data.List                     (sort)
 import qualified Data.Text                     as T
 import           Development.IDE.Core.Rules
 import           Development.IDE.Graph         (ShakeOptions (shakeThreads))
@@ -25,7 +26,8 @@ import           Ide.Arguments
 import           Ide.Logger
 import           Ide.Plugin.ConfigUtils        (pluginsToDefaultConfig,
                                                 pluginsToVSCodeExtensionSchema)
-import           Ide.Types                     (IdePlugins, ipMap)
+import           Ide.Types                     (IdePlugins, PluginId (PluginId),
+                                                ipMap)
 import           Ide.Version
 import qualified Language.LSP.Server           as LSP
 import qualified System.Directory.Extra        as IO
@@ -51,6 +53,12 @@ defaultMain args idePlugins = do
         VersionMode PrintNumericVersion ->
             putStrLn haskellLanguageServerNumericVersion
 
+        ListPluginsMode -> do
+            let pluginNames = sort
+                    $ map ((\(PluginId t) -> T.unpack t) . fst)
+                    $ ipMap idePlugins
+            mapM_ putStrLn pluginNames
+
         BiosMode PrintCradleType -> do
             dir <- IO.getCurrentDirectory
             hieYaml <- Session.findCradle def dir