This library uses Template Haskell and language-c-quote, a quasi-quotation library for C-like languages, to provide inline C and Objective-C in Haskell. It extracts the C/Objective-C code automatically, when compiling the Haskell program, and generates marshalling code for common types. The wiki on GitHub details the motivation for this approach.
For further motivation, have a look at the slides of my YOW! Lambda Jam 2014 talk Foreign Inline Code in Haskell.
To build the library, just use cabal install as usual from the source code directory or by installing from Hackage.
You may like to have a look at a minimal example of its use, which you can build as follows:
- Execute
cd tests/objc/minimal; make. - Now run the demo executable with
./Minimal.
To build the proof of concept example, do the following:
- Execute
cd tests/objc/concept; make. - Now run the demo executable with
./InlineObjC.
To build an example class wrapping a Haskell record, do the following:
- Execute
cd tests/objc/record; make. - Now run the demo executable with
./Particle.
To build the more complex Haskell interpreter app:
- Execute
cd tests/objc/app; make. - Now
open -a HSApp.app.
I tested it with Haskell Platform 2013.2.0.0 (which includes GHC 7.6.3) and it requires the latest version of language-c-quote, which is currently 0.7.7.
The library is in beta and so far focuses on Objective-C. Automatic marshalling support is still somewhat limited. However, it is quite easy to add more types, and I do welcome pull request!