I work mostly with Haskell now, so the utility of calling Haskell from Ruby is not very high. If you're interested in maintaining it, drop me a line - it should actually be a lot easier to operationalise it now, given cabal sandboxes, but I don't have the time.
Hubris is a bridge between Ruby and Haskell, between love and bondage, between slothful indolence and raw, blazing speed. Hubris will wash your car, lie to your boss, and salvage your love life. If you are very, very lucky, it might also let you get some functional goodness into your ruby programs through the back door.
I probably don't have to say this, but patches are very much welcome. If you have trouble installing it, tell me, and help me improve the docs.
The best docs, as ever, are in the tests, but as a quick precis, you can use it a little like this:
require 'hubris' # best line ever class Target hubris :inline =>"triple::Int->Int; triple n = 3*n" end t = Target.new puts t.triple(10) #=> 30
There are a few restrictions. All functions take one argument and return one value: this shouldn't be a major problem because you can pass arrays of arguments in if you need more. Hubris can currently handle numbers, strings, basic types (like nil, true and false), arrays and hashes. There will probably be some Ruby structures (modules, regular expressions, etc) that won't ever be handled natively unless someone can convince me it's a sensible thing to do.
Hubris will refuse to compile Haskell code that produces any warnings. You can suppress this admittedly fairly strict behaviour by passing the ":no_strict => true" flag, but in your heart of hearts you'll know you've done the wrong thing.
There are also two other modes:
hubris :source => "MyCoolModule.hs"
which loads a source file on disk (in the same directory as your ruby), and
hubris :module => "Data.ByteString", :packages => ["bytestring"]
which will load the Data.ByteString module which is installed on the system. In this case, we also need to let the Haskell side know that we'll be using the "bytestring" package, so we pass that too: You may need to load extra packages with :inline and :source as well, and that's supported.
- ghc 6.10 (to bootstrap 6.12) and cabal-install. This comes with the Haskell Platform
- ruby 1.8.6 or higher (most heavily tested on 1.9.1)
- Linux or Mac. See http://www.shimweasel.com/2009/09/14/unprincipled-skulduggery-with-ghc-6-12-dylibs-on-mac-os-x and the following entry for more info on the Mac build.
- zsh or bash
- Mark Wotton
- James Britt
- Josh Price
- Tatsuhiro Ujihisa
(The MIT License) Copyright (c) 2009 Mark Wotton Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.