Remove Makefile from cabal tarball; man page building is now handled by a small haskell program.

This actually runs faster than building the man pages from the makefile
did. But the main purpose is to let Setup.hs import Build.Mans and so not
need the makefile.

Build/Mans.hs

@@ -0,0 +1,58 @@
+{- Build man pages.
+ -
+ - Copyright 2016 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# OPTIONS_GHC -fno-warn-tabs #-}
+
+module Build.Mans where
+
+import System.Directory
+import System.FilePath
+import Data.List
+import Control.Monad
+import System.Process
+import System.Exit
+import Data.Maybe
+import Utility.Exception
+
+main :: IO ()
+main = do
+	mans <- buildMans
+	when (any isNothing mans) $
+		error "mdwn2man failed"
+
+buildMans :: IO [Maybe FilePath]
+buildMans = do
+	mansrc <- filter isManSrc <$> getDirectoryContents "doc"
+	createDirectoryIfMissing False "man"
+	forM mansrc $ \f -> do
+		let src = "doc" </> f
+		let dest = srcToDest src
+		srcm <- getModificationTime src
+		destm <- catchMaybeIO $ getModificationTime dest
+		if (Just srcm > destm)
+			then do
+				r <- system $ unwords
+					[ "./Build/mdwn2man"
+					, progName src
+					, "1"
+					, src
+					, "> " ++ dest
+					]
+				if r == ExitSuccess
+					then return (Just dest)
+					else return Nothing
+			else return (Just dest)
+
+isManSrc :: FilePath -> Bool
+isManSrc s = "git-annex" `isPrefixOf` (takeFileName s)
+	&& takeExtension s == ".mdwn"
+
+srcToDest :: FilePath -> FilePath
+srcToDest s = "man" </> progName s ++ ".1"
+
+progName :: FilePath -> FilePath
+progName = dropExtension . takeFileName

Build/mdwn2man

@@ -2,8 +2,6 @@
 # Warning: hack
 
 my $prog=shift;
-$prog=~s/\.\d+$//;
-$prog=~s/man\///;
 my $section=shift;
 
 print ".TH $prog $section\n";