Added support for auto-completing option flags and pragmas

.gitignore

@@ -1,2 +1,9 @@
 dist/
 elisp/*.elc
+*~
+# Mac OS generates
+# .DS_Store
+
+# Where do these files come from?  They're not readable.
+# For instance, .#Help.page
+# .#*

Flag.hs

@@ -0,0 +1,10 @@
+module Flag where
+
+import DynFlags
+import Types
+
+listFlags :: Options -> IO String
+listFlags opt = return $ convert opt $
+   [ "-f" ++ prefix ++ option
+   | (option,_,_) <- fFlags, prefix <- ["","no-"]
+   ]

GHCMod.hs

@@ -11,6 +11,7 @@ import Data.Typeable
 import Data.Version
 import Info
 import Lang
+import Flag
 import Lint
 import List
 import Paths_ghc_mod
@@ -31,6 +32,7 @@ usage =    "ghc-mod version " ++ showVersion version ++ "\n"
         ++ "Usage:\n"
         ++ "\t ghc-mod list" ++ ghcOptHelp ++ "[-l]\n"
         ++ "\t ghc-mod lang [-l]\n"
+        ++ "\t ghc-mod flag [-l]\n"
         ++ "\t ghc-mod browse" ++ ghcOptHelp ++ "[-l] [-o] <module> [<module> ...]\n"
         ++ "\t ghc-mod check" ++ ghcOptHelp ++ "<HaskellFile>\n"
         ++ "\t ghc-mod type" ++ ghcOptHelp ++ "<HaskellFile> <module> <expression>\n"
@@ -93,11 +95,13 @@ main = flip catches handlers $ do
       "info"   -> withFile (infoExpr opt (safelist cmdArg 2) (safelist cmdArg 3)) (safelist cmdArg 1)
       "lint"   -> withFile (lintSyntax opt)  (safelist cmdArg 1)
       "lang"   -> listLanguages opt
+      "flag"   -> listFlags opt
       "boot"   -> do
          mods  <- listModules opt
          langs <- listLanguages opt
+         flags <- listFlags opt
          pre   <- browseModule opt "Prelude"
-         return $ mods ++ langs ++ pre
+         return $ mods ++ langs ++ flags ++ pre
       cmd      -> throw (NoSuchCommand cmd)
     putStr res
   where

elisp/ghc-comp.el

@@ -48,6 +48,8 @@ unloaded modules are loaded")
 (defvar ghc-module-names nil)   ;; completion for "import"
 (defvar ghc-merged-keyword nil) ;; completion for type/func/...
 (defvar ghc-language-extensions nil)
+(defvar ghc-option-flags nil)
+(defvar ghc-pragma-names '("LANGUAGE" "OPTIONS_GHC"))
 
 (defconst ghc-keyword-prefix "ghc-keyword-")
 (defvar ghc-keyword-Prelude nil)
@@ -56,12 +58,13 @@ unloaded modules are loaded")
 (defun ghc-comp-init ()
   (let* ((syms '(ghc-module-names
 		ghc-language-extensions
+		ghc-option-flags
 		ghc-keyword-Prelude))
 	 (vals (ghc-boot (length syms))))
     (ghc-set syms vals))
   (ghc-add ghc-module-names "qualified")
   (ghc-add ghc-module-names "hiding")
-  (ghc-add ghc-language-extensions "LANGUAGE")
+  ;; (ghc-add ghc-language-extensions "LANGUAGE")
   (ghc-merge-keywords '("Prelude"))
   (run-with-idle-timer ghc-idle-timer-interval 'repeat 'ghc-idle-timer))
 
@@ -172,8 +175,16 @@ unloaded modules are loaded")
     ghc-module-names)
    ((save-excursion
       (beginning-of-line)
-      (looking-at "{-#"))
+      (looking-at "{-# LANGUAGE "))
     ghc-language-extensions)
+   ((save-excursion
+      (beginning-of-line)
+      (looking-at "{-# OPTIONS_GHC "))
+    ghc-option-flags)
+   ((save-excursion
+      (beginning-of-line)
+      (looking-at "{-# "))
+    ghc-pragma-names)
    ((or (bolp)
 	(let ((end (point)))
 	  (save-excursion

ghc-mod.cabal

@@ -23,7 +23,7 @@ Data-Files:             Makefile ghc.el ghc-func.el ghc-doc.el ghc-comp.el
                         ghc-flymake.el ghc-command.el ghc-info.el ghc-ins-mod.el
 Executable ghc-mod
   Main-Is:              GHCMod.hs
-  Other-Modules:        List Browse Cabal CabalDev Check Info Lang Lint Types ErrMsg Paths_ghc_mod
+  Other-Modules:        List Browse Cabal CabalDev Check Info Lang Flag Lint Types ErrMsg Paths_ghc_mod
   if impl(ghc >= 6.12)
     GHC-Options:        -Wall -fno-warn-unused-do-bind
   else