Setup.hs: eliminate "minimal" mode, fix darcs version info

The reported number of recorded changes since the last tagged version was off
by one (because it counted the change that set the tag).
Also added a note that -K32M is not needed when using new-comp. But -old-comp
is still available as a configuration option, so I'm keeping -K32M for now.

Setup.hs

@@ -51,8 +51,8 @@ main = defaultMainWithHooks simpleUserHooks{ preBuild =gfPreBuild
 -- Commands for building the Resource Grammar Library
 --------------------------------------------------------
 
-data Mode = AllTenses | Present | Minimal deriving Show
-all_modes = ["minimal","present","alltenses"]
+data Mode = AllTenses | Present deriving Show
+all_modes = ["present","alltenses"]
 default_modes = [Present,AllTenses]
 
 data RGLCommand
@@ -282,7 +282,6 @@ gfc1 mode pkg lbi file = do
       preproc = case mode of
                   AllTenses -> ""
                   Present   -> "-preproc="++({-rgl_src_dir </>-} "mkPresent")
-                  Minimal   -> "-preproc="++({-rgl_src_dir </>-} "mkMinimal")
   createDirectoryIfMissing True dir
   putStrLn $ "Compiling [" ++ show mode ++ "] " ++ file
   run_gfc pkg lbi ["-s", "-no-pmcfg", preproc, "--gfo-dir="++dir, file]
@@ -317,7 +316,6 @@ getOptMode args =
     else explicit_modes
   where
     explicit_modes =
-      [Minimal|have "minimal"]++
       [Present|have "present"]++
       [AllTenses|have "alltenses"]
 
@@ -344,7 +342,7 @@ getRGLBuildSubDir lbi mode =
   case mode of
     AllTenses -> "alltenses"
     Present   -> "present"
-    Minimal   -> "minimal"
+
 
 getRGLBuildDir lbi mode = rgl_dst_dir lbi </> getRGLBuildSubDir lbi mode
 
@@ -372,7 +370,9 @@ unlexer abstr ls =
 -- | Runs the gf executable in compile mode with the given arguments.
 run_gfc :: PackageDescription -> LocalBuildInfo -> [String] -> IO ()
 run_gfc pkg lbi args =
-    do let args' = ["-batch","-gf-lib-path="++rgl_src_dir,"+RTS","-K32M","-RTS"] ++ filter (not . null) args
+    do let args' = ["-batch","-gf-lib-path="++rgl_src_dir]
+                   ++ ["+RTS","-K32M","-RTS"] -- not needed with new-comp
+                   ++ filter (not . null) args
            gf = default_gf pkg lbi
            gf_cmdline = gf ++ " " ++ unwords (map showArg args')
 --     putStrLn $ "Running: " ++ gf_cmdline
@@ -409,11 +409,14 @@ extractDarcsVersion distFlag =
                       [] -> []
                       tag:_ -> ["--from-tag="++tag]
          changes <- lines `fmap` readProcess "darcs" ("changes":from) ""
-         let dates = filter ((`notElem` [""," "]).take 1) changes
+         let dates = init' (filter ((`notElem` [""," "]).take 1) changes)
          whatsnew<-E.try $ lines `fmap` readProcess "darcs" ["whatsnew","-s"] ""
          return (listToMaybe tags,listToMaybe dates,
                  length dates,either (const 0) length whatsnew)
 
+    init' [] = []
+    init' xs = init xs
+
 -- | Only update the file if contents has changed
 updateFile path new =
   do old <- E.try $ readFile path