1 files changed, 47 insertions, 0 deletions
diff --git a/git-annex.hs b/git-annex.hs
new file mode 100644
index 000000000..71a21379d
--- /dev/null
+++ b/git-annex.hs
@@ -0,0 +1,47 @@
+{- git-annex main program -}
+
+import IO (try)
+import System.IO
+import System.Environment
+
+import qualified Annex
+import Types
+import Core
+import Commands
+import qualified GitRepo as Git
+import BackendList
+
+main = do
+	args <- getArgs
+	gitrepo <- Git.repoFromCwd
+	state <- Annex.new gitrepo allBackends
+	(flags, actions) <- parseCmd args state
+	tryRun state $ [startup flags] ++ actions ++ [shutdown]
+
+{- Runs a list of Annex actions. Catches IO errors and continues
+ - (but explicitly thrown errors terminate the whole command).
+ - Propigates an overall error status at the end.
+ -
+ - This runs in the IO monad, not in the Annex monad. It seems that
+ - exceptions can only be caught in the IO monad, not in a stacked monad;
+ - or more likely I missed an easy way to do it. So, I have to laboriously
+ - thread AnnexState through this function.
+ -}
+tryRun :: AnnexState -> [Annex ()] -> IO ()
+tryRun state actions = tryRun' state 0 actions
+tryRun' state errnum (a:as) = do
+	result <- try $ Annex.run state a
+	case (result) of
+		Left err -> do
+			showErr err
+			tryRun' state (errnum + 1) as
+		Right (_,state') -> tryRun' state' errnum as
+tryRun' state errnum [] = do
+	if (errnum > 0)
+		then error $ (show errnum) ++ " failed"
+		else return ()
+
+{- Exception pretty-printing. -}
+showErr e = do
+	hPutStrLn stderr $ "git-annex: " ++ (show e)
+	return ()