Safe Haskell	None
Language	Haskell2010

HIE.Bios

Contents

Find and load a Cradle
Compiler Options
Initialising a GHC session from a Cradle
Loading targets into a GHC session

Description

The HIE Bios

Provides an abstraction over the GHC Api to initialise a GHC session and loading modules in a project.

Defines the `hie.yaml` file specification. This is used to explicitly configure how a project should be built by GHC.

Synopsis

data Cradle = Cradle {
- cradleRootDir :: FilePath
- cradleOptsProg :: CradleAction
}
data CradleLoadResult r
- = CradleSuccess r
- | CradleFail CradleError
- | CradleNone
data CradleError = CradleError ExitCode [String]
findCradle :: FilePath -> IO (Maybe FilePath)
loadCradle :: FilePath -> IO Cradle
loadImplicitCradle :: FilePath -> IO Cradle
defaultCradle :: FilePath -> Cradle
data ComponentOptions = ComponentOptions {
- componentOptions :: [String]
- componentDependencies :: [FilePath]
}
getCompilerOptions :: FilePath -> Cradle -> IO (CradleLoadResult ComponentOptions)
initSession :: GhcMonad m => ComponentOptions -> m [Target]
loadFile :: GhcMonad m => (FilePath, FilePath) -> m (Maybe TypecheckedModule, [TypecheckedModule])

Find and load a Cradle

data Cradle Source #

The environment of a single Cradle. A Cradle is a unit for the respective build-system.

It contains the root directory of the Cradle, the name of the Cradle (for debugging purposes), and knows how to set up a GHC session that is able to compile files that are part of this Cradle.

A Cradle may be a single unit in the "cabal-install" context, or the whole package, comparable to how "stack" works.

Constructors

Cradle
Fields cradleRootDir :: FilePath The project root directory. cradleOptsProg :: CradleAction The action which needs to be executed to get the correct command line arguments.

Instances

Show Cradle Source #
Instance details Defined in HIE.Bios.Types Methods showsPrec :: Int -> Cradle -> ShowS # show :: Cradle -> String # showList :: [Cradle] -> ShowS #

data CradleLoadResult r Source #

Result of an attempt to set up a GHC session for a Cradle. This is the go-to error handling mechanism. When possible, this should be preferred over throwing exceptions.

Constructors

CradleSuccess r	The cradle succeeded and returned these options.
CradleFail CradleError	We tried to load the cradle and it failed.
CradleNone	No attempt was made to load the cradle.

Instances

Functor CradleLoadResult Source #
Instance details Defined in HIE.Bios.Types Methods fmap :: (a -> b) -> CradleLoadResult a -> CradleLoadResult b # (<$) :: a -> CradleLoadResult b -> CradleLoadResult a #

data CradleError Source #

Constructors

CradleError ExitCode [String]

Instances

Show CradleError Source #
Instance details Defined in HIE.Bios.Types Methods showsPrec :: Int -> CradleError -> ShowS # show :: CradleError -> String # showList :: [CradleError] -> ShowS #
Exception CradleError Source #
Instance details Defined in HIE.Bios.Types Methods toException :: CradleError -> SomeException # fromException :: SomeException -> Maybe CradleError # displayException :: CradleError -> String #

findCradle :: FilePath -> IO (Maybe FilePath) Source #

Given root/foo/bar.hs, return root/hie.yaml, or wherever the yaml file was found.

loadCradle :: FilePath -> IO Cradle Source #

Given root/hie.yaml load the Cradle.

loadImplicitCradle :: FilePath -> IO Cradle Source #

Given root/foo/bar.hs, load an implicit cradle

defaultCradle :: FilePath -> Cradle Source #

Default cradle has no special options, not very useful for loading modules.

Compiler Options

data ComponentOptions Source #

Option information for GHC

Constructors

ComponentOptions

Fields

componentOptions :: [String]
Command line options.
componentDependencies :: [FilePath]
Dependencies of a cradle that might change the cradle. Contains both files specified in hie.yaml as well as specified by the build-tool if there is any. FilePaths are expected to be relative to the cradleRootDir to which this CradleAction belongs to. Files returned by this action might not actually exist. This is useful, because, sometimes, adding specific files changes the options that a Cradle may return, thus, needs reload as soon as these files are created.

Instances

Eq ComponentOptions Source #
Instance details Defined in HIE.Bios.Types Methods (==) :: ComponentOptions -> ComponentOptions -> Bool # (/=) :: ComponentOptions -> ComponentOptions -> Bool #
Show ComponentOptions Source #
Instance details Defined in HIE.Bios.Types Methods showsPrec :: Int -> ComponentOptions -> ShowS # show :: ComponentOptions -> String # showList :: [ComponentOptions] -> ShowS #

getCompilerOptions :: FilePath -> Cradle -> IO (CradleLoadResult ComponentOptions) Source #

Initialize the DynFlags relating to the compilation of a single file or GHC session according to the provided Cradle.

Initialising a GHC session from a Cradle

initSession :: GhcMonad m => ComponentOptions -> m [Target] Source #

Start a GHC session and set some sensible options for tooling to use. Creates a folder in the cache directory to cache interface files to make reloading faster.

Loading targets into a GHC session

loadFile Source #

Arguments

:: GhcMonad m
=> (FilePath, FilePath)	Target file to load.
-> m (Maybe TypecheckedModule, [TypecheckedModule])	Typechecked module and modules that had to be loaded for the target.

Load a target into the GHC session with the default messager which outputs updates in the same format as normal GHC.

The target is represented as a tuple. The tuple consists of the original filename and another file that contains the actual source code to compile.

If the message should configured, use loadFileWithMessage.

If the loading succeeds, the typechecked module is returned together with all the typechecked modules that had to be loaded in order to typecheck the given target.