UNDO reliability - Githubissues

Interlisp / medley

The main repo for the Medley Interlisp project. Wiki, Issues are here. Other repositories include maiko (the VM implementation) and Interlisp.github.io (web site sources)

https://Interlisp.org

MIT License

369 stars 19 forks source link

UNDO reliability #1144

Open masinter opened 1 year ago

masinter commented 1 year ago

[ ] UNDO of a LOADFNS erases the function, doesn't restore it I was working on SIMPLECHATSERVER in the CHATSERVER file. I did a LOADFNS to load in an older version. Then I did UNDO of the LOADFNS and it instead trashed it.
[ ] DWIM changes to typed in code isn't saved for REDO If what you typed in has an error, and you get a DWIM prompt FOO -> foo, it doesn't change the entry on the history list -- didn't it used to? Need to check.

masinter commented 1 year ago

Originally, the substitution of RPLACA by /RPLACA was a function done by LISPX before evaling. The wrapping of UNDOABLY as a macro looks neat, but macro translations wind up copying things in ways that changing the RPLACA to /RPLACA doesn't survive.

The size of the call stack and the number of frames that are internal is also of concern. Is it really necessary for an EVAL to have an EVALFORM call? Just keep it tidy, and look at INTERESTING-FRAME-P.