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|
{-# LANGUAGE TypeFamilies #-}
module Hadrian.Oracles.Path (
lookupInPath, bashPath, fixAbsolutePathOnWindows, pathOracle
) where
import Control.Monad
import Data.Maybe
import Data.Char
import Data.List.Extra
import Development.Shake
import Development.Shake.Classes
import Development.Shake.FilePath
import System.Directory
import System.Info.Extra
import Hadrian.Utilities
-- | Lookup a specified 'FilePath' in the system @PATH@.
lookupInPath :: FilePath -> Action FilePath
lookupInPath name
| name == takeFileName name = askOracle $ LookupInPath name
| otherwise = return name
-- | Lookup the path to the @bash@ interpreter.
bashPath :: Action FilePath
bashPath = lookupInPath "bash"
-- | Fix an absolute path on Windows:
-- * "/c/" => "C:/"
-- * "/usr/bin/tar.exe" => "C:/msys/usr/bin/tar.exe"
fixAbsolutePathOnWindows :: FilePath -> Action FilePath
fixAbsolutePathOnWindows path =
if isWindows
then do
let (dir, file) = splitFileName path
winDir <- askOracle $ WindowsPath dir
return $ winDir -/- file
else
return path
newtype LookupInPath = LookupInPath String
deriving (Binary, Eq, Hashable, NFData, Show, Typeable)
type instance RuleResult LookupInPath = String
newtype WindowsPath = WindowsPath FilePath
deriving (Binary, Eq, Hashable, NFData, Show, Typeable)
type instance RuleResult WindowsPath = String
-- | Oracles for looking up paths. These are slow and require caching.
pathOracle :: Rules ()
pathOracle = do
void $ addOracleCache $ \(WindowsPath path) -> do
Stdout out <- quietly $ cmd ["cygpath", "-m", path]
let windowsPath = unifyPath $ dropWhileEnd isSpace out
putLoud $ "| Windows path mapping: " ++ path ++ " => " ++ windowsPath
return windowsPath
void $ addOracleCache $ \(LookupInPath name) -> do
let unpack = fromMaybe . error $ "Cannot find executable " ++ quote name
path <- unifyPath . unpack <$> liftIO (findExecutable name)
putLoud $ "| Executable found: " ++ name ++ " => " ++ path
return path
|
