;;; **********************************************************************
;;; Copyright (c) 92, 93 Hallvard Traetteberg. All rights reserved.
;;; Use and copying of this software and preparation of derivative works
;;; based upon this software are permitted and may be copied as long as 
;;; no fees or compensation are charged for use, copying, or accessing
;;; this software and all copies of this software include this copyright
;;; notice.  Suggestions, comments and bug reports are welcome.  Please 
;;; address email to: [email protected]
;;; **********************************************************************

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This window editor is made as part of the DRIVE II project, V2039,
KITS - Knowledge based and Intelligent Traffic control System.
The implementation was done by the Norwegian partner, SINTEF SI,
which was funded by the Norwegian road authorities and the
Norwegian Research Council. The port from MCL to Allegro was
done by the Italian partner, Automa.

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The editor is inspired by emacs, of course, but has only a small set
of basic commands, although it has fairly general machinery that
makes it quite extendible. The code is undocumented, but quite tidy
and shouldn't be to difficult to understand for those who want to extend
it.

The CLIM specific code should perhaps be looked at by a CLIM expert,
in addition, the editor lacks interfacing to the CLIM redisplay and
output record mechanism. This should be easy to add for CLIM experts.
The editor has been designed to support variable width fonts, but this
hasn't been tested.

The editor is currently standalone, I haven't tried making a line
editor or a widget out of it, i.e. including it as part of another
window. This should be fairly easy, since it already keeps itself
within a specified area within a window.

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Features:
  Most basic editing functionality, including one step undo
  CLOS Stream I/O interface for MCL and Allegro
    (If anyone makes a Lucid port, tell me!)
  Find and Save File
  Interface to Lisp through eval and macroexpand commands.
  Handles errors gracefully (traps them all!).
  Full window editing.
  Supports word wrapping and fairly efficient redisplay.

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To try it load the files named in the system definition,
edit and eval site-specific.lisp. At the bottom of that file are
two ways of activating the editor.

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This files in the ed directory:

README
  This file!

ed-packages.lisp
  Defines all the packages.

ed.lisp
  The basic editor machinery, excluding all window stuff.

ed-commands.lisp
  Defines a set of 'commands' meant as the interface to the editor.

ed-stream.lisp
  Stream interface to the basic editor, both input and output.

wed.lisp
  The window system part of the editor.

wed-stream.lisp
  Stream interface to the window editor, both input and output.

wed-frame.lisp
  Defines the window editor application frame.

wed-frame-commands.lisp
  The window editor commands.

site-specific.lisp
  Variables with site-specific values and code to make and activate a frame.

ed.system
  Defsystem system definition.

ed-commands-doc.lisp
  Documentation for the window editor commands.

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Hallvard Traetteberg
Dept. of Knowledge Based Systems
SINTEF SI
Box 124 Blindern, 0314 Oslo 3
NORWAY

Tel: +47 22 06 79 83, Fax: +47 22 06 73 50
Email: [email protected]