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< Yi
Revision as of 06:29, 17 June 2008 by Andydude (Talk | contribs)

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1 Installation

  • How do I install Yi?
get it from Hackage. Configure, compile and install Yi as you would do for any other Cabal package.
  • Setup.hs does not compile!
You need to use Cabal version 1.2.3. To make sure you use it, do:
   ghc -package Cabal- --make Setup.hs
   ./Setup configure ...
  • Setup configure fails with
Setup.hs: Package yi-0.3 can't be built on this system.
It means that you have no UI package available. You need VTY or GTK2hs installed. Get them from Hackage.
  • On Mac OS X if you get an error message similar to this:
yi: can't load .so/.DLL for: gthread-2.0 (dlopen(libgthread-2.0.dylib, 10): image not found)
then your dynamic library search path variable is probably not set correctly. You can set it (in Bash) using:
export DYLD_LIBRARY_PATH=/opt/local/lib
(Adjust the specific path to your system. You can find the right location using locate libgthread)
  • ByteString problems: Yi as of 27 January 2008 cannot use the most recent ByteString library (because of the regexp libraries) which is - it needs a version like 0.9 or You may have the correct ByteString library installed, but still see an error like:
Couldn't match expected type
against inferred type `B.ByteString'
In the second argument of `renderBS', namely `(B.pack str)'
In the expression: renderBS (styleToAttr sty) (B.pack str)
In the definition of `withStyle':
withStyle sty str = renderBS (styleToAttr sty) (B.pack str)
This is because versions of ByteString often aren't compatible, and in this case, the VTY library was compiled with a different version.
  • I get
No instance for (RegexLike Regex B.ByteString)
The proper fix requires some more cabal features which hopefully come with Cabal 1.4. So long we have a workaround as described in this message.

For a more extensive explanation, see

1.1 Development

  • How do I install Yi for development?
Get it from while there are other repositories of Yi out there, this is the latest.
  • What are some of the dependancies?
The development version of Yi currently requires Cabal-1.5.2, Crypto-4.1.0, fingertree-0.0, and utf8-string-0.3.1.
If you are on Mac OS X and are using MacPorts, then these will not be included in the GHC in that distribution. Many of the dependancies are in MacPorts (for example: ghc, ghc-devel, alex, and gtk2hs). However, you may have some trouble building with Cabal-1.5.2, since it is a development version of Cabal. To work around these issues, you might have to add the line "Build-Type: Simple" to the .cabal files in the above required packages.

2 Configuration

2.1 How to Configure Yi

You can find configuration file examples in the 'examples/' directory, or online at

A good way to start is to copy yi.hs in your ~/.yi directory (create it if needed), and hack as needed.

3 Usage