<text, tool> (Originally "Lucid Emacs") A text editor for the X Window
System, based on GNU Emacs version 19, produced by a collaboration of Lucid,
Inc., SunPro (a division of Sun Microsystems, Inc.), and the University of
Lucid chose to build part of Energize, their C/C++ development environment on
top of GNU Emacs. Though their product is commercial, the work on GNU Emacs is
free software, and is useful without having to purchase the product. They needed
a version of Emacs with mouse-sensitive regions, multiple fonts, the ability to
mark sections of a buffer as read-only, the ability to detect which parts of a
buffer has been modified, and many other features.
The existing version of Epoch was not sufficient; it did not allow arbitrary
pixmaps and icons in buffers, "undo" did not restore changes to regions, regions
did not overlap and merge their attributes. Lucid spent some time in 1990
working on Epoch but later decided that their efforts would be better spent
improving Emacs 19 instead.
Lucid did not have time to get their changes accepted by the FSF so they
released Lucid Emacs as a forked branch of Emacs. Roughly a year after Lucid
Emacs 19.0 was released, a beta version of the FSF branch of Emacs 19 was
released. Lucid continued to develop and support Lucid Emacs, merging in bug
fixes and new features from the FSF branch as appropriate.
A compatibility package was planned to allow Epoch 4 code to run in Lemacs with
little or no change. (As of 19.8, Lucid Emacs ran a descendant of the Epoch
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