58 lines
1.3 KiB
Haskell
58 lines
1.3 KiB
Haskell
{- /bin/sh handling
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-
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- Copyright 2013 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE CPP #-}
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module Utility.Shell (
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shellPath,
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shebang,
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findShellCommand,
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) where
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import Utility.SafeCommand
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#ifdef mingw32_HOST_OS
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import Utility.Path
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import Utility.Exception
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import Utility.PartialPrelude
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#endif
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#ifdef mingw32_HOST_OS
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import System.FilePath
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#endif
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shellPath :: FilePath
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shellPath = "/bin/sh"
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shebang :: String
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shebang = "#!" ++ shellPath
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-- | On Windows, shebang is not handled by the kernel, so to support
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-- shell scripts etc, have to look at the program being run and
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-- parse it for shebang.
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--
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-- This has no effect on Unix.
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findShellCommand :: FilePath -> IO (FilePath, [CommandParam])
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findShellCommand f = do
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#ifndef mingw32_HOST_OS
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defcmd
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#else
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l <- catchDefaultIO Nothing $ headMaybe . lines <$> readFile f
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case l of
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Just ('#':'!':rest) -> case words rest of
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[] -> defcmd
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(c:ps) -> do
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let ps' = map Param ps ++ [File f]
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-- If the command is not inSearchPath,
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-- take the base of it, and run eg "sh"
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-- which in some cases on windows will work
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-- despite it not being inSearchPath.
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ok <- inSearchPath c
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return (if ok then c else takeFileName c, ps')
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_ -> defcmd
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#endif
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where
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defcmd = return (f, [])
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