throw any menu. use a buffer to display errors instead.

Check.hs

@@ -19,13 +19,10 @@ checkSyntax opt file = do
     hSetBinaryMode herr False
     refine <$> hGetContents herr
   where
-    refine = unfoldLines . map shrinkSpaces . remove . lines
+    refine = unfoldLines . remove . lines
     remove = filter (\x -> not ("Linking" `isPrefixOf` x))
            . filter (\x -> not ("[" `isPrefixOf` x))
            . filter (/="")
-    shrinkSpaces x
-      | isSpace (head x) = ' ' : dropWhile isSpace x
-      | otherwise        = x
 
 unfoldLines :: [String] -> String
 unfoldLines [] = ""
@@ -34,8 +31,7 @@ unfoldLines (x:xs) = x ++ unfold xs
     unfold [] = "\n"
     unfold (l:ls)
       | isAlpha (head l)           = ('\n':l) ++ unfold ls
-      | " Inferred" `isPrefixOf` l = "." ++ l ++ unfold ls
-      | otherwise                  = l ++ unfold ls
+      | otherwise                  = (drop 4 l) ++ "\0" ++ unfold ls
 
 ----------------------------------------------------------------
 

elisp/ghc-flymake.el

@@ -10,11 +10,13 @@
 
 (require 'flymake)
 
+(defvar ghc-error-buffer-name "*GHC Errors*")
+
 (defvar ghc-flymake-allowed-file-name-masks
   '("\\.l?hs$" ghc-flymake-init flymake-simple-cleanup flymake-get-real-file-name))
 
 (defvar ghc-flymake-err-line-patterns
-  '("^\\(.*\\.l?hs\\):\\([0-9]+\\):\\([0-9]+\\): \\(.+\\)" 1 2 3 4))
+  '("^\\(.*\\.l?hs\\):\\([0-9]+\\):\\([0-9]+\\):[ ]*\\(.+\\)" 1 2 3 4))
 
 (add-to-list 'flymake-allowed-file-name-masks
 	     ghc-flymake-allowed-file-name-masks)
@@ -22,6 +24,8 @@
 (add-to-list 'flymake-err-line-patterns
 	     ghc-flymake-err-line-patterns)
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
 (defun ghc-flymake-init ()
   (let ((after-save-hook nil))
     (save-buffer))
@@ -29,20 +33,44 @@
     (list ghc-module-command (append (ghc-module-command-args)
 				     (list "check" file)))))
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun ghc-display-errors ()
+  (interactive)
+  (let* ((data (ghc-flymake-data))
+	 (buf (get-buffer-create ghc-error-buffer-name)))
+    (with-current-buffer buf
+      (erase-buffer)
+      (ghc-insert-errors data))
+    (display-buffer buf)))
+
+(defun ghc-insert-errors (data)
+  (let ((title (nth 0 data))
+	(errs (nth 1 data)))
+    (insert title "\n")
+    (dolist (err errs)
+      (insert (ghc-replace-character (car err) 0 10) "\n"))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
 (defun ghc-flymake-insert-type ()
   (interactive)
-  (let ((data (ghc-flymake-data)))
+  (let ((data (ghc-flymake-first-data)))
     (if (and data
-	     (string-match "Inferred type: \\([^:]+ :: \\)\\(forall [^.]+\\. \\)?\\(.*\\)" data))
+	     (string-match "Inferred type: \\([^:]+ :: \\)\\(forall [^.]+\\. \\)?\\([^\0]*\\)" data))
       (progn
 	(beginning-of-line)
 	(insert (match-string 1 data) (match-string 3 data) "\n"))
       (message "No inferred type"))))
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
 (defun ghc-flymake-data ()
   (let* ((line-no (flymake-current-line-no))
-         (line-err-info-list (nth 0 (flymake-find-err-info flymake-err-info line-no)))
-         (menu-data (flymake-make-err-menu-data line-no line-err-info-list)))
-    (nth 0 (nth 0 (nth 1 menu-data)))))
+         (info (nth 0 (flymake-find-err-info flymake-err-info line-no))))
+    (flymake-make-err-menu-data line-no info)))
+
+(defun ghc-flymake-first-data ()
+  (nth 0 (nth 0 (nth 1 (ghc-flymake-data)))))
 
 (provide 'ghc-flymake)

elisp/ghc.el

@@ -52,7 +52,7 @@
     (define-key haskell-mode-map ghc-import-key      'ghc-load-module-buffer)
     (define-key haskell-mode-map ghc-previous-key    'flymake-goto-prev-error)
     (define-key haskell-mode-map ghc-next-key        'flymake-goto-next-error)
-    (define-key haskell-mode-map ghc-help-key        'flymake-display-err-menu-for-current-line)
+    (define-key haskell-mode-map ghc-help-key        'ghc-display-errors)
     (define-key haskell-mode-map ghc-insert-type-key 'ghc-flymake-insert-type)
     (ghc-comp-init)
     (setq ghc-initialized t)))