83 lines
2.8 KiB
Haskell
83 lines
2.8 KiB
Haskell
{- running git commands
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-
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- Copyright 2010, 2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Git.Command where
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import qualified Data.Text.Lazy as L
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import qualified Data.Text.Lazy.IO as L
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import Control.Concurrent
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import Control.Exception (finally)
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import Common
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import Git
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import Git.Types
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{- Constructs a git command line operating on the specified repo. -}
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gitCommandLine :: [CommandParam] -> Repo -> [CommandParam]
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gitCommandLine params repo@(Repo { location = Dir _ } ) =
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-- force use of specified repo via --git-dir and --work-tree
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[ Param ("--git-dir=" ++ gitDir repo)
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, Param ("--work-tree=" ++ workTree repo)
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] ++ params
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gitCommandLine _ repo = assertLocal repo $ error "internal"
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{- Runs git in the specified repo. -}
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runBool :: String -> [CommandParam] -> Repo -> IO Bool
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runBool subcommand params repo = assertLocal repo $
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boolSystem "git" $ gitCommandLine (Param subcommand : params) repo
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{- Runs git in the specified repo, throwing an error if it fails. -}
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run :: String -> [CommandParam] -> Repo -> IO ()
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run subcommand params repo = assertLocal repo $
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unlessM (runBool subcommand params repo) $
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error $ "git " ++ subcommand ++ " " ++ show params ++ " failed"
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{- Runs a git subcommand and returns its output, lazily.
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-
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- Note that this leaves the git process running, and so zombies will
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- result unless reap is called.
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-}
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pipeRead :: [CommandParam] -> Repo -> IO String
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pipeRead params repo = assertLocal repo $ do
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(_, h) <- hPipeFrom "git" $ toCommand $ gitCommandLine params repo
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fileEncoding h
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hGetContents h
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{- Runs a git subcommand, feeding it input.
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- You should call either getProcessStatus or forceSuccess on the PipeHandle. -}
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pipeWrite :: [CommandParam] -> L.Text -> Repo -> IO PipeHandle
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pipeWrite params s repo = assertLocal repo $ do
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(p, h) <- hPipeTo "git" (toCommand $ gitCommandLine params repo)
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L.hPutStr h s
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hClose h
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return p
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{- Runs a git subcommand, feeding it input, and returning its output.
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- You should call either getProcessStatus or forceSuccess on the PipeHandle. -}
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pipeWriteRead :: [CommandParam] -> String -> Repo -> IO (PipeHandle, String)
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pipeWriteRead params s repo = assertLocal repo $ do
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(p, from, to) <- hPipeBoth "git" (toCommand $ gitCommandLine params repo)
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fileEncoding to
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fileEncoding from
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_ <- forkIO $ finally (hPutStr to s) (hClose to)
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c <- hGetContents from
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return (p, c)
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{- Reads null terminated output of a git command (as enabled by the -z
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- parameter), and splits it. -}
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pipeNullSplit :: [CommandParam] -> Repo -> IO [String]
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pipeNullSplit params repo =
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filter (not . null) . split sep <$> pipeRead params repo
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where
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sep = "\0"
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{- Reaps any zombie git processes. -}
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reap :: IO ()
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reap = do
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-- throws an exception when there are no child processes
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catchDefaultIO (getAnyProcessStatus False True) Nothing
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>>= maybe noop (const reap)
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