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authorGravatar Joey Hess <joey@kitenet.net>2012-06-06 00:03:08 -0400
committerGravatar Joey Hess <joey@kitenet.net>2012-06-06 00:10:34 -0400
commitf1bd72ea546be705334ba8f6d01d9dcfb0c33cf9 (patch)
treec14d5f0c567c34265526c23faa4743685d7f7bcd /Git/UpdateIndex.hs
parent141fa3c94d9b5d9404b8e875b6806f27340f2cf3 (diff)
factor out generic update-index code from unionmerge code
Diffstat (limited to 'Git/UpdateIndex.hs')
-rw-r--r--Git/UpdateIndex.hs49
1 files changed, 49 insertions, 0 deletions
diff --git a/Git/UpdateIndex.hs b/Git/UpdateIndex.hs
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+++ b/Git/UpdateIndex.hs
@@ -0,0 +1,49 @@
+{- git-update-index library
+ -
+ - Copyright 2011, 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Git.UpdateIndex (
+ Streamer,
+ stream_update_index,
+ update_index_line,
+ ls_tree
+) where
+
+import System.Cmd.Utils
+
+import Common
+import Git
+import Git.Command
+
+{- Streamers are passed a callback and should feed it lines in the form
+ - read by update-index, and generated by ls-tree. -}
+type Streamer = (String -> IO ()) -> IO ()
+
+{- Streams content into update-index from a list of Streamers. -}
+stream_update_index :: Repo -> [Streamer] -> IO ()
+stream_update_index repo as = do
+ (p, h) <- hPipeTo "git" (toCommand $ gitCommandLine params repo)
+ fileEncoding h
+ forM_ as (stream h)
+ hClose h
+ forceSuccess p
+ where
+ params = map Param ["update-index", "-z", "--index-info"]
+ stream h a = a (streamer h)
+ streamer h s = do
+ hPutStr h s
+ hPutStr h "\0"
+
+{- Generates a line suitable to be fed into update-index, to add
+ - a given file with a given sha. -}
+update_index_line :: Sha -> FilePath -> String
+update_index_line sha file = "100644 blob " ++ show sha ++ "\t" ++ file
+
+{- Gets the current tree for a ref. -}
+ls_tree :: Ref -> Repo -> Streamer
+ls_tree (Ref x) repo streamer = mapM_ streamer =<< pipeNullSplit params repo
+ where
+ params = map Param ["ls-tree", "-z", "-r", "--full-tree", x]