IHaskell is a kernel for the Jupyter project, which allows you to use Haskell inside Jupyter frontends (including the console and notebook).
Interactive In-Browser Notebook
Note: IHaskell does not support Windows. To use on Windows, install Virtualbox, install Ubuntu or another Linux distribution, and proceed with the install instructions.
Install Using Installation Scripts
If you are using a modern version of Ubuntu, clone the repository and then run the
git clone http://www.github.com/gibiansky/IHaskell cd IHaskell ./ubuntu-install.sh
This script will ask you for
sudo permissions in order to install IHaskell dependencies. The script is readable and easy to inspect if you wish to know what it does before giving it root permissions.
Mac OS X:
On Mac OS X, clone the repository and then run the
git clone http://www.github.com/gibiansky/IHaskell cd IHaskell ./macos-install.sh
Note that you must have Homebrew installed for this script to work.
Install IPython 3.0 or above:
pip install ipython[all]
This may require root permissions on some systems, in which case put a
sudo before that command before running it.
Once this is done, running
ipython --version should print out
3.0 or above.
Note that IHaskell requires 3.0 or above; IHaskell will not work with IPython 2 or earlier.
Install GHC and Cabal. You must have appropriate versions of both:
ghc --numeric-version # Should be 7.6.* or 7.8.* cabal --version # Should be 1.18.* or newer
Install ZeroMQ, a library IHaskell uses for asynchronous communication.
Mac OS X: With Homebrew installed, run
brew install zeromq. (If using 32-bit Haskell Platform, you may need to use
brew install zeromq --universal. YMMV.)
sudo apt-get install libzmq3-dev.
- Other: You can install ZeroMQ from source or use another package manager:
# Compiling from source: git clone firstname.lastname@example.org:zeromq/zeromq4-x.git libzmq cd libzmq ./autogen.sh && ./configure && make sudo make install sudo ldconfig
If your own platform has a package and I haven't included instructions for it, feel free to send me an email or a PR on this README.
Install Haskell Tools
First, make sure that executables installed by
cabal are on your shell
# If you have a ~/.cabal/bin folder: export PATH=~/.cabal/bin:$PATH # If you have a ~/Library/Haskell/bin folder on OS X: export PATH=~/Library/Haskell/bin:$PATH
Then, install the
happy parser generator tool and
cabal install happy cpphs
Install IHaskell! You may install it from Hackage via
cabal install ihaskell --reorder-goals
As IHaskell updates frequently, you may also want to clone the repository and install from there:
git clone http://www.github.com/gibiansky/IHaskell cd IHaskell ./build.sh ihaskell # Build and install IHaskell
The build script,
build.sh, is a script for building IHaskell and dependencies. It has the following modes:
ihaskell: Build and install
ihaskelland the two dependencies from this repository,
quick: Just install
ihaskell, do not bother recompiling and reinstalling its dependencies (
ihaskelland all the support libraries in
all: Install everything, including
ihaskell, the dependencies, and all the support libraries in
ihaskell-display/. It is run via
./build.sh allor equivalent.
IHaskell may also be built in a sandbox, via something like:
cd IHaskell cabal sandbox init cabal sandbox add-source ihaskell-display/* ghc-parser ipython-kernel cabal install IHaskell $(basename ihaskell-display/*)
ihaskell installto install the IHaskell kernel into Jupyter.
ipython notebookfor the browser-based interactive notebook.
ipython console --kernel haskellfor a REPL.
(Optional) Install Support Libraries
IHaskell comes with many support libraries, such as
ihaskell-parsec, and so on, which add rich and interactive displays for common libraries.
You can install these with
cabal install. To install all of them, clone this repository and run
./build.sh all to install IHaskell and all of its display support libraries.
You may run into some issues with installing the
cairo dependency on Macs. To fix this, you can install
brew and then use it to install
brew install gcc49 cabal install cairo --with-gcc=gcc-4.9
These are simply some problems have had and solutions to them.
Problem: You have Anaconda or Enthought or some other python distribution, and for unknown reasons IHaskell just hangs after the first input.
Solution: Anaconda and Enthought cause problems. Get rid of them.
Problem: You get an error when
pyzmq is compiling that looks somewhat like
cc1: error: -Werror=unused-command-line-argument-hard-error-in-future: No option -Wunused-command-line-argument-hard-error-in-future
Solution: Rerun the command after changing the
ARCHFLAGS variable via
Problem: You'd like to have IHaskell run some code every time it starts up, like
Solution: IHaskell uses
~/.ihaskell/rc.hs as its default configuration file; if you put code into that file (it may or may not exist), it will be loaded on startup. You can substitute a different file by passing the
--conf=myfile.hs argument to
ihaskell install to reconfigure the kernel.
Note: You may have some trouble due to browser caches with the notebook interface if you also use IPython's notebook interface or have used it in the past. If something doesn't work or IPython says it can't connect to the notebook server, make sure to clear the browser cache in whatever browser you're using, or try another browser.
IHaskell is a 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.
For package maintainers: IHaskell has an ability to display data types it knows about with a rich format based on images or HTML. In order to do so, an external package
ihaskell-something must be created and installed. Writing these packages is simply - they must just contain instance of the
IHaskellDisplay typeclass, defined in
IHaskell.Display, and for a package
ihaskell-something should have a single module
IHaskell.Display.Something. If you have a package with interesting data types that would benefit from a rich display format, please get in contact with me (andrew dot gibiansky at gmail) to write one of these packages! A sample package is available here.
Please format your code with
hindent --style gibiansky before submitting it; Travis CI automatically checks for code style before merging!
Loading IHaskell into GHCi for testing:
Use one of the methods below to access IHaskell files in GHCi. Once inside GHCi, you can load an IHaskell file; for example,
Using cabal repl
If you have the latest version of cabal (>v1.18.0), the simplest thing to do is
cd <path-to-IHaskell> cabal repl
This will hide all packages not listed in
Using GHCi directly
If you don't want to use
cabal repl, you can just call ghci which can read the
.ghci file included in the repository for the options.
cd <path-to-IHaskell> chmod 600 .ghci # trust the .ghci file ghci
Then in the ghci session you can type things like:
:set -package setenv :load src/Hspec.hs hspec parserTests :browse IHaskell.Types