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|
-----------------------------------------------------------------------------
-- |
-- Module : Hadrian.Oracles.Cabal.Rules
-- Copyright : (c) Andrey Mokhov 2014-2018
-- License : MIT (see the file LICENSE)
-- Maintainer : andrey.mokhov@gmail.com
-- Stability : experimental
--
-- This module defines Shake rules corresponing to the /Cabal oracle/; see
-- the module "Hadrian.Oracles.Cabal" for various supported queries.
-----------------------------------------------------------------------------
module Hadrian.Oracles.Cabal.Rules where
import Control.Monad
import Data.Maybe
import Development.Shake
import Distribution.Simple.GHC
import Distribution.Simple.Program.Db
import Distribution.Verbosity
import Builder
import Context
import Hadrian.Haskell.Cabal.Parse
import Hadrian.Oracles.Cabal.Type
import Hadrian.Package
import Hadrian.Utilities
-- | These oracle rules are used to cache and track answers to the following
-- queries, which are implemented via the Cabal library:
--
-- 1) 'Hadrian.Oracles.Cabal.readPackageData' that reads Cabal package data.
--
-- 2) 'Hadrian.Oracles.Cabal.readContextData' that reads 'Context'-dependent
-- Cabal package data.
--
-- 3) 'Hadrian.Oracles.Cabal.configurePackageGHC' that configures a package.
cabalOracle :: Rules ()
cabalOracle = do
void $ addOracleCache $ \(PackageDataKey package) -> do
let file = pkgCabalFile package
need [file]
putLoud $ "| PackageData oracle: parsing " ++ quote file ++ "..."
parsePackageData package
void $ addOracleCache $ \(ContextDataKey context@Context {..}) -> do
putLoud $ "| ContextData oracle: resolving data for "
++ quote (pkgName package) ++ " (" ++ show stage
++ ", " ++ show way ++ ")..."
-- Calling 'need' on @setup-config@ triggers 'configurePackage'. Why
-- this indirection? Going via @setup-config@ allows us to cache the
-- configuration step, i.e. not to repeat it if it's already been done.
setupConfig <- pkgSetupConfigFile context
need [setupConfig]
resolveContextData context
void $ addOracleCache $ \(PackageConfigurationKey (pkg, stage)) -> do
putLoud $ "| PackageConfiguration oracle: configuring "
++ quote (pkgName pkg) ++ " (" ++ show stage ++ ")..."
-- Configure the package with the GHC corresponding to the given stage
hcPath <- builderPath (Ghc CompileHs stage)
(compiler, maybePlatform, _pkgdb) <- liftIO $
configure silent (Just hcPath) Nothing emptyProgramDb
let platform = fromMaybe (error msg) maybePlatform
msg = "PackageConfiguration oracle: cannot detect platform"
return $ PackageConfiguration (compiler, platform)
|
