GNU bug report logs - #17684
24.4.50; Feature Request -- Vertical Lines to the Left of and Through Characters

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From: Keith David Bershatsky <esq <at> lawlist.com>
To: 22873 <at> debbugs.gnu.org,17684 <at> debbugs.gnu.org
Cc: John Wiegley <jwiegley <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>, Marcin Borkowski <mbork <at> mbork.pl>, Richard Stallman <rms <at> gnu.org>
Subject: bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs).
Date: Wed, 27 Dec 2017 09:13:37 -0800

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The attached draft patch.diff applies to the Emacs 26 branch; bearing last commit da94ea92bc3ba6c236b394c00e6bbb725131a149; dated 12/26/2017.

Feature request #17684 (crosshairs) uses the same mechanism as #22873 (multiple fake cursors), and the former was actually what inspired me to work on the latter.  There is still no support to deal with placing fake cursors on text containing fancy overlays, text properties or combined characters.  At this time, multiple fake cursors that persist are redrawn each command loop -- which can someday be optimized.  Crosshairs are on an idle-timer.

In my own setup, I have incorporated #22873 to work with Magnar's multiple cursors library using just a slight modification to a couple of his functions, and can provide that if anyone is interested.  In a nutshell, Emacs can draw multiple fake cursors using #22873 instead of using the rectangle overlay chosen by Magnar.

+-mode is pretty straight forward.  Evaluate or load +-mode.el and type:  M-x +-mode

A simple interactive function demonstrating multiple fake cursors is named mc-test, which is within +-mode.el

I will continue to work on this project as time goes by -- it is still a work in progress ...

Keith

[patch.diff (application/diff, attachment)]

[+-mode.el (application/el, attachment)]

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