Foreign.Hoppy.Generator.Main

A driver for a command-line interface to a generator.

A simple Main.hs for a generator can simply be:

import Foreign.Hoppy.Generator.Main (defaultMain)
import Foreign.Hoppy.Generator.Spec (ErrorMsg, Interface, interface)

interfaceResult :: Either ErrorMsg Interface
interfaceResult = interface ...

main :: IO ()
main = defaultMain interfaceResult

Documentation

data Action

Actions that can be requested of the program.

Constructors

SelectInterface String

Sets the interface that will be used for subsequent actions.

ListInterfaces

Lists the interfaces compiled into the generator.

ListCppFiles

Lists the generated files in C++ bindings.

ListHsFiles

Lists the generated files in Haskell bindings.

GenCpp FilePath

Generates C++ wrappers for an interface in the given location.

GenHaskell FilePath

Generates Haskell bindings for an interface in the given location.

defaultMain :: Either String Interface -> IO ()

This provides a simple main function for a generator. Define your main as:

main = defaultMain $ interface ...

Refer to run for how to use the command-line interface. Use defaultMain' if you want to include multiple interfaces in your generator.

defaultMain' :: [Either String Interface] -> IO ()

This is a version of defaultMain that accepts multiple interfaces.

run :: [Interface] -> [String] -> IO [Action]

run interfaces args runs the driver with the command-line arguments from args against the listed interfaces, and returns the list of actions performed.

The recognized arguments are listed below. The exact forms shown are required; the --long-arg=value style is not supported.

• --help: Displays a menu listing the valid commands.
• --list-interfaces: Lists the interfaces compiled into the generator.
• --interface <iface>: Sets the interface that will be used for subsequent arguments.
• --gen-cpp <outdir>: Generates C++ bindings in the given directory.
• --gen-hs <outdir>: Generates Haskell bindings under the given top-level source directory.