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Ellipsis mode for zmacs?
Date: Tue, 25 Jun 1991 19:05 EDT
From: rsl@MAX-FLEISCHER.SF.Dialnet.ILA.COM (Richard Lamson)
Date: Tue, 25 Jun 91 12:30:47 -0600
From: email@example.com (David R. Strip)
(sorry if this is a repost, seems to have gotten lost
as far as I can tell)
Is there some sort of ellipsis mode for zmacs? By that I mean
a way of marking sections of buffer to be hidden (perhaps
recursively). It would be great for outlining, code writing, etc.
I assume so, because Concordia uses it. I don't know anything about how
you actually build buffers which can do this, though.
I think this is the "disconnected sections" stuff that appeared in Zwei
a few releases ago.
Unfortunately, there don't appear to be any uses of this in the standard
system, so there are no source examples to look at. From what I can
tell, the way you do this is to define a buffer flavor that implements the
:UNLINKED-SECTIONS-P () - returns non-NIL
:BUFFER-NEXT-UNLINKED-LINE (BUFFER LINE) - LINE will always be the last
line of a section, and this should return the first line of the next
section, or NIL if LINE was the last line of the last section.
:BUFFER-PREVIOUS-UNLINKED-LINE (BUFFER LINE) - analogous for the other
You'd also probably need to implement a whopper for :SAVE to expand all
the ellipses before writing the buffer out.