IHaskell is an implementation of the IPython kernel protocol which allows you to use Haskell inside IPython frontends such as
The project works with the IPython shell:
As well as the IPython browser-based notebook interface:
Make sure you have IPython version 1.0 or higher. IHaskell will not work with older versions of IPython.
ipython --version # Should print 1.0.0 (or higher!)
Download the package from the Github repository:
git clone https://github.com/gibiansky/IHaskell
sudo apt-get install libzmq3-dev # Ubuntu (Saucy only) brew install zeromq # Macs with Homebrew
(For older versions of Ubuntu, you should be able to download the ZeroMQ3 source and install without much difficulty.)
sudo apt-get install happy # Ubuntu
Install the package:
cd IHaskell; cabal install;
Create the IPython profile:
Run the notebook or console interface:
IHaskell notebook # Should open a browser window! IHaskell console
There is a test notebook in the
IHaskell is an extremely young project, and I'd love your help getting it to a stable and useful point. There's a lot to do, and if you'd like to contribute, feel free to get in touch with me via my email at andrew period gibiansky at gmail - although browsing the code should be enough to get you started, I'm more than happy to answer any questions myself.
Some ideas for improvements:
- Type annotations. When a statement is evaluated, the GHC API returns the names of all bound variables. It should be possible to take those names and find the types of the variables, and display them in a table via the
- Implementing useful directives. Currently, support for GHCi-style ":"-initiated directives exist, but they do not do anything (and are instead just printed in green). Useful directives such as ":t" and ":i" and ":m [+-]" have yet to be implemented, and adding them would be a good way to get started with the codebase.
- Parsing and viewing of formats via
aesoncompatibility which displays JSON as syntax highlighted JSON code via HTML.
- Support for
hmatrixvectors and matrices being displayed.
- `A custom typeclass for displaying data types as HTML, similar to Show.
Take a look at the developer notes as well - they are sparse but may be helpful.
Skim the rather-lacking Haddock documentation.
Main: Argument parsing and basic messaging loop, using Haskell Chans to communicate with the ZeroMQ sockets.
IHaskell.Types: All message type definitions.
IHaskell.Eval.Evaluate: Wrapper around GHC API, exposing a single
evaluateinterface that runs a statement, declaration, import, or directive.
IHaskell.IPython: Shell scripting wrapper using
IHaskell.Message.Parser: Parsing messages received from IPython.
IHaskell.Message.UUID: UUID generator and data structure.
IHaskell.ZeroMQ: Low-level ZeroMQ communication wrapper.
serveProfilestarts listening on all necessary sockets, and returns a
ZeroMQInterfacerecord. This record exposes reading and writing
Chan Messagemessages for all the necessary sockets, so then the rest of the application can simply use that interface.