Xemacs
(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 Illinois }.
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 redisplay engine .)
[Update ?]
(2000 -05 -16 )
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