EIEIO is an Emacs lisp program which implements a controlled object-oriented programming methodology following the CLOS standard. EIEIO also has object browsing functions, and custom widget types. It has a fairly complete manual describing how to use it.

EIEIO also supports the byte compiler for Emacs and XEmacs. Because of the nature of byte compiling, EIEIO is picky about the version of Emacs you are running. It supports Emacs 19.2x+, 20, 21, 22, 23, XEmacs 19.1x, 20.x and 21.x. Byte compiling EIEIO is VERY IMPORTANT for performance.

Sample EIEIO driven tree Sample EIEIO driven chart

linemark

Maintain colored marks on lines in multiple buffers.
Visual C++ bookmark UI as example code.
Hilight Compilation hits as example code.

tree

display trees in emacs buffers.

call-tree

display a call tree to an emacs lisp function

chart

display bar charts in emacs buffers. Includes several useful examples

Tools using EIEIO

Semantic

Parser Generator. The Database which tracks tags between sessions uses EIEIO persistent data classes.

EDE

Emacs Development Environment uses EIEIO to track project information, and uses persistend data classes, instance inheritors, and instance trackers. It also uses speedbar classes to provide a project overview.

SRecode

Semantic Recoder template manager uses EIEIO to handle template tables.

COGRE

COnnected GRaph Editor uses EIEIO to track graph elements.

JDE

Java Development Environment for Emacs uses EIEIO to manage the debugger, dialogs, and more.

ECB

Emacs Code Browser. Browse your files and source code.

XAE

XML Authoring tool.

jomtool

Java code generator.

Check it out here

Join the mailing list

Join the mailing list to ask question, or help develop EIEIO.

Notes:

EIEIO should work with Emacs 19.3x, 20.x, and 21.x. It should also work (and is usually included with) XEmacs 20.x, and 21.x.