Yi editor

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Yi

Yi in GTK mode
Design by	Various; primary developer Jean-Philippe Bernardy
Latest release	0.4.3 / 29 July 2008
Preview release	latest Darcs revision / (snapshot)
OS	POSIX-compatible (minimal Microsoft Windows support)
Platform	Cross-platform; requires GHC
Available in	English
Type	Text editor
License	GPL
Website	[1]

Yi is a text editor written and extensible in Haskell. The goal of Yi is to provide a flexible, powerful and correct editor core dynamically scriptable in Haskell.

Yi used to be a Haskell interpreter^[1], very much like Emacs is an Emacs Lisp interpreter; however, the current version of Yi recompiles the code that describes its settings (including editing modes and extensions). Specifically, Yi is implemented as a small executable program which compiles through GHC the larger body of code which actually constitutes a useful editor; this small 'kernel' can repeatedly recompile (and thus type-check) the extensions. This makes it easy to dynamically hack, experiment and modify Yi despite it being written in a strongly statically typed language. Using Haskell as a first-class extension languages means that other libraries and tools written in Haskell are also readily usable in editor code.

The long term goal of the project is to in essence make Yi the editor of choice for Haskell hackers in much the same way that Emacs is the editor of choice for Lisp programmers.

1 Front ends
2 "Emulation modes"
3 References
4 External links

Front ends

Yi can use either gtk2hs or vty as front ends, so users can choose their favorite interface. There is also an experimental Cocoa frontend.

"Emulation modes"

The primary emulation modes for Yi are vim and emacs. Keybindings for vi, mg and nano and other are also provided. Other editor interfaces can be written by the user to extend Yi.