From 108200581a0d3b898254bf278f959178587bd856 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Sat, 8 Dec 2018 03:15:55 +0000
Subject: Compiling only .[l]hs[c] files

Should take care of issue #371
---
 examples/xmobar.hs        |  1 -
 src/Xmobar/App/Compile.hs |  6 +++---
 src/Xmobar/App/Main.hs    | 20 +++++++++++++-------
 3 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/examples/xmobar.hs b/examples/xmobar.hs
index 1325ae7..05c77ca 100644
--- a/examples/xmobar.hs
+++ b/examples/xmobar.hs
@@ -16,7 +16,6 @@
 -- and xmobar will compile and launch it for you and
 ------------------------------------------------------------------------------
 
-
 import Xmobar
 
 -- Example user-defined plugin
diff --git a/src/Xmobar/App/Compile.hs b/src/Xmobar/App/Compile.hs
index 6c136dc..0a763b4 100644
--- a/src/Xmobar/App/Compile.hs
+++ b/src/Xmobar/App/Compile.hs
@@ -17,7 +17,7 @@
 ------------------------------------------------------------------------------
 
 
-module Xmobar.App.Compile(recompile, xmessage) where
+module Xmobar.App.Compile(recompile, trace, xmessage) where
 
 import Control.Monad.IO.Class
 import Control.Monad.Fix (fix)
@@ -70,12 +70,12 @@ shouldRecompile verb src bin lib = do
   binT <- getModTime bin
   if any (binT <) (srcT : libTs)
     then do
-      trace verb "Xmobar doing recompile because some files have changed."
+      trace verb "Xmobar recompiling because some files have changed."
       return True
     else do
       trace verb $ "Xmobar skipping recompile because it is not forced "
                    ++ "(e.g. via --recompile), and not any *.hs / *.lhs / *.hsc"
-                   ++ "files in lib/ have been changed."
+                   ++ " files in lib/ have been changed."
       return False
   where isSource = flip elem [".hs",".lhs",".hsc"] . takeExtension
         allFiles t = do
diff --git a/src/Xmobar/App/Main.hs b/src/Xmobar/App/Main.hs
index 2291852..3240df9 100644
--- a/src/Xmobar/App/Main.hs
+++ b/src/Xmobar/App/Main.hs
@@ -28,6 +28,7 @@ import System.Posix.Process (executeFile)
 import System.Environment (getArgs)
 import System.FilePath
 import System.FilePath.Posix (takeBaseName, takeDirectory)
+import Text.Parsec.Error (ParseError)
 
 import Graphics.X11.Xlib
 
@@ -40,7 +41,7 @@ import Xmobar.X11.Text
 import Xmobar.X11.Window
 import Xmobar.App.Opts
 import Xmobar.App.EventLoop (startLoop, startCommand)
-import Xmobar.App.Compile (recompile)
+import Xmobar.App.Compile (recompile, trace)
 import Xmobar.App.Config
 
 xmobar :: Config -> IO ()
@@ -66,12 +67,17 @@ cleanupThreads vars =
   for_ (concat vars) $ \(asyncs, _) ->
     for_ asyncs cancel
 
-buildLaunch :: Bool -> Bool -> FilePath -> IO ()
-buildLaunch verb force p = do
+buildLaunch :: Bool -> Bool -> FilePath -> ParseError -> IO ()
+buildLaunch verb force p e = do
   let exec = takeBaseName p
       dir = takeDirectory p
-  recompile dir exec force verb
-  executeFile (dir </> exec) False [] Nothing
+      ext = takeExtension p
+  if ext `elem` [".hs", ".hsc", ".lhs"]
+    then recompile dir exec force verb >>
+         executeFile (dir </> exec) False [] Nothing
+    else trace True ("Invalid configuration file: " ++ show e) >>
+         trace True "\n(No compilation attempted: \
+                    \only .hs, .hsc or .lhs files are compiled)"
 
 xmobar' :: [String] -> Config -> IO ()
 xmobar' defs cfg = do
@@ -93,6 +99,6 @@ xmobarMain = do
                 _ -> xmobar defaultConfig
     Just p -> do r <- readConfig defaultConfig p
                  case r of
-                   Left _ ->
-                     buildLaunch (verboseFlag flags) (recompileFlag flags) p
+                   Left e ->
+                     buildLaunch (verboseFlag flags) (recompileFlag flags) p e
                    Right (c, defs) -> doOpts c flags >>= xmobar' defs
-- 
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