Various simplifications

Author: Jan Hrček

app/HieWrapper.hs

@@ -54,9 +54,7 @@ main = do
 
 run :: GlobalOpts -> IO ()
 run opts = do
-  let mLogFileName = case optLogFile opts of
-        Just f  -> Just f
-        Nothing -> Nothing
+  let mLogFileName = optLogFile opts
 
       logLevel = if optDebugOn opts
                    then L.DEBUG
@@ -85,20 +83,18 @@ run opts = do
 
   let
     hieBin = "hie-" ++ ghcVersion
-    backupHieBin = "hie-" ++ reverse (tail $ dropWhile (/='.') $ reverse ghcVersion)
+    backupHieBin = "hie-" ++ init (dropWhileEnd (/='.') ghcVersion)
+    candidates' = [hieBin, backupHieBin, "hie"]
+    candidates = map (++ exeExtension) candidates'
 
-  logm $ "hie exe candidates :" ++ show (hieBin,backupHieBin)
-
-  let candidates' = [hieBin, backupHieBin, "hie"]
-      candidates = map (++ exeExtension) candidates'
+  logm $ "hie exe candidates :" ++ show candidates
 
   mexes <- traverse findExecutable candidates
 
   case asum mexes of
     Nothing -> logm $ "cannot find any hie exe, looked for:" ++ intercalate ", " candidates
     Just e -> do
       logm $ "found hie exe at:" ++ e
-      -- putStrLn $ "found hie exe at:" ++ e
       args <- getArgs
       logm $ "args:" ++ show args
       logm "launching ....\n\n\n"

app/MainHie.hs

@@ -100,9 +100,7 @@ main = do
 
 run :: GlobalOpts -> IO ()
 run opts = do
-  let mLogFileName = case optLogFile opts of
-        Just f  -> Just f
-        Nothing -> Nothing
+  let mLogFileName = optLogFile opts
 
       logLevel = if optDebugOn opts
                    then L.DEBUG

docs/Hacking.md

@@ -17,6 +17,9 @@ To build and test with all of them, use
 make test
 ```
 
+Note that some tests require `liquid` binary to be present in your PATH. 
+To install it follow the instructions in [liquidhaskell](https://github.com/ucsd-progsys/liquidhaskell/blob/develop/INSTALL.md).
+
 To see what version/compiler you are running
 
 ```bash
@@ -130,7 +133,7 @@ the `plugins` table.
 
 ### Operation
 
-When a request is recived from any of the frontends, this is routed to the
+When a request is received from any of the frontends, this is routed to the
 central dispatcher via a `Chan`. Based on the specified plugin name and
 `IdeRequest` `ideCommand` value the appropriate `UiCommand` is identified and
 its `uiFunc` is called.
@@ -144,5 +147,5 @@ type Dispatcher = forall m. (MonadIO m,GHC.GhcMonad m,HasIdeState m) => IdeReque
 This type is not the monad used in `HIE`, but does guarantee that it can access
 IO and the `HIE` state, which is currently only the table of plugins.
 
-It also makes the `GhcMonad` available. In a fully general version this my not
+It also makes the `GhcMonad` available. In a fully general version this may not
 be necessary.

docs/Protocol.md

@@ -4,7 +4,7 @@
 
 https://github.com/Microsoft/language-server-protocol/blob/master/protocol.md
 
-Advantages include widespread tooling and IDE support, and standarisation.
+Advantages include widespread tooling and IDE support, and standardization.
 
 Implemented in [LspStdio.hs](../src/Haskell/Ide/Engine/Transport/LspStdio.hs)
 

docs/hcar/2015.tex

@@ -25,7 +25,7 @@
 Idris community has done toward an interactive editing environment as well. This
 is a deliberately broad scope, the initial versions will be very limited at
 first. The sooner we can get started the sooner we will have something concrete
-to criticise and improve.
+to criticize and improve.
 
 Help is very much needed and wanted so if this is a problem that interests you,
 please pitch in! This is not a project just for a small inner circle. Anyone

src/Haskell/Ide/Engine/Plugin/Base.hs

@@ -111,21 +111,18 @@ getProjectGhcVersion = do
   if isStackProject && isStackInstalled
     then do
       L.infoM "hie" "Using stack GHC version"
-      catch (tryCommand "stack ghc -- --version") $ \e -> do
+      catch (tryCommand "stack ghc -- --numeric-version") $ \e -> do
         L.errorM "hie" $ show (e :: SomeException)
         L.infoM "hie" "Couldn't find stack version, falling back to plain GHC"
-        tryCommand "ghc --version"
+        tryCommand "ghc --numeric-version"
     else do
       L.infoM "hie" "Using plain GHC version"
-      tryCommand "ghc --version"
+      tryCommand "ghc --numeric-version"
 
   where
     tryCommand cmd =
-      crackGhcVersion <$> readCreateProcess (shell cmd) ""
-    -- "The Glorious Glasgow Haskell Compilation System, version 8.4.3\n"
-    -- "The Glorious Glasgow Haskell Compilation System, version 8.4.2\n"
-    crackGhcVersion :: String -> String
-    crackGhcVersion st = reverse $ takeWhile (/=' ') $ tail $ reverse st
+      -- Drop '\n' from the output like "7.10.3\n", "8.4.3\n"
+      init <$> readCreateProcess (shell cmd) ""
 
 hieGhcVersion :: String
 hieGhcVersion = VERSION_ghc

src/Haskell/Ide/Engine/Transport/LspStdio.hs

@@ -810,9 +810,7 @@ requestDiagnostics DiagnosticsRequest{trigger, file, trackingNumber, documentVer
       forM_ dss $ \(pid,ds) -> do
         logm $ "requestDiagnostics: calling diagFunc for plugin:" ++ show pid
         let
-          enabled = case Map.lookup pid dpsEnabled of
-            Nothing -> True
-            Just flag -> flag
+          enabled = Map.findWithDefault True pid dpsEnabled
           publishDiagnosticsIO = Core.publishDiagnosticsFunc lf
           maxToSend = maybe 50 maxNumberOfProblems mc
           sendOne (fileUri,ds') = do