[Haskell-cafe] Darcs as undo/redo system?

Jeremy Shaw jeremy at n-heptane.com
Fri May 8 15:35:51 EDT 2009

At Fri, 8 May 2009 17:33:25 +0200,
Peter Verswyvelen wrote:
> [1  <multipart/alternative (7bit)>]
> [1.1  <text/plain; ISO-8859-1 (7bit)>]
> If you work with a text editor like Microsoft Visual Studio (maybe also
> Eclipse, don't know), each text editor has its own undo/redo history.
> However, when you perform refactoring - like renaming a function - this
> becomes an undo/redo on multiple files together, so in a sense these changes
> are part of a global history.

If you read this paper, you will find an undo system for a
colloborative editor complete with a theory that looks like a
primitive version of darcs patch theory (complete with the dreaded
merge bug of darcs 1):

 Undoing actions in collaborative work: Framework and experience by Prakash and Knister

You will probably find these papers informative as well:

 Recognizing creative needs in user interface design by Terry and Mynatt

 A Selective Undo Mechanism for Graphical User Interfaces Based On Command Objects (1994) by Thomas Berlage

 Flexible Conflict Detection and Management In Collaborative Applications (1997) by Keith Edwards

 Undo Any Operation at Any Time in Group Editors (2000) by Chengzheng Sun

And, of course, you can use citeseer to find more papers that reference those. 

- jeremy

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