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bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs).
From: |
Keith David Bershatsky |
Subject: |
bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs). |
Date: |
Mon, 08 Apr 2019 21:03:20 -0700 |
This is version 018.000 of a proof concept for multiple fake cursors and
crosshairs.
Special thanks to Eli Z. and Alan T. for helping me out on numerous issues over
the past few months -- greatly appreciated!!!
VERSION:
- 018.000 [04/08/2019]
CHANGELOG:
- Creation of fake cursors now immediately follows calls to `draw_glyphs'.
- Removal of fake cursors occurs prior to Emacs scrolling the text on the glass
directly and at the outset of `update_window'.
- The NS port now automatically redraws fake cursors that got erased because
they
were left/right overwritten glyphs, but work still needs to be done on the w32
and X ports. The future plan of attack for the w32 and X ports is probably
similar to the NS port; i.e., left/right overwritten glyphs have their strings
tagged during `mc_draw_glyphs' and are dealt with on a per port basis when
FRAME_RIF (f)->mc_scribe_string is called.
- Semi-duplicate functions have been created so as to reduce the number of entry
points into the core code base of Emacs. [This approach enables semi- worry
free tinkering without the risk of breaking something important.]
- Removal of scroll bars no longer erase fake cursors when windows are resized
or deleted on the NS and w32 ports. [I didn't see any issues on an X11
build.]
- Numerous bug fixes, some minor and some major.
SETUP:
Step 1: git clone -b master git://git.sv.gnu.org/emacs.git
Step 2: In the new emacs folder, go back to an Emacs version from 04/08/2019:
git reset --hard a038df77de7b1aa2d73a6478493b8838b59e4982
Step 3: From within the new emacs folder created in Step 1, apply the patch:
git apply /path/to/the/patch.diff
Step 4: ./autogen.sh
Step 5: ./configure ... [your custom options]
Step 6: make
Step 7: make install
USAGE:
- For a minimal working example of built-in fake cursors, type: M-x mc-test
;;; TURN ON FAKE CURSORS (buffer position, cursor-type, cursor color):
(setq mc-conf '((1 "hbar" "magenta")
(2 "bar" "purple")
(3 "box" "#00FF00")
(4 "hollow" "#0000FF")
(5 ("hbar" 3) [1.0 0.0 1.0])
(6 ("bar" 3) [0.0 1.0 1.0])
(7 "framed" "OrangeRed"))))
;;; TURN OFF FAKE CURSORS:
(setq mc-conf nil)
- To try out the crosshairs feature, type: M-x +-mode
- To try out built-in fake cursors with Magnar Sveen's multiple-cursors package,
install that package first. [If the multiple-cursors package is installed, an
eval-after-load "multiple-cursors-core" statement within `crosshairs.el` will
redefine a couple of functions and set up a few keyboard shortcuts.] If the
multiple-cursors package by Magnar Sveen is not already installed, then here
are two easy ways to install that package:
Type: M-x mc-install
OR, evaluate the following snippet:
(progn
(require 'package)
(add-to-list 'package-archives '("melpa" .
"http://melpa.milkbox.net/packages/") t)
(package-initialize)
(package-refresh-contents)
(package-install 'multiple-cursors))
TODO:
- When using the multiple fake cursors feature, a fake cursor does not show up
at
zv_p.
- Deal with left/right overwritten glyphs in the w32 and X ports of Emacs.
- Reduce the removal of fake cursors to the bare minimum when scrolling the text
on the glass directly, and whenever `update_window' is called.
- When an idle-timer fires and point is at the end of a horizontally scrolled
line in a narrow window, the temporary horizontal scroll is canceled. Create
an minimal working example and file a bug report.
- There is a bug affecting the recorded `w->mc.lnum_pixel_width` that is
observable when not running under gdb, but disappears when running under gdb.
While viewing a folded org-mode buffer, the non-gdb instance had a visible
line number pixel-width of 44, but Emacs treated it as fluctuating between
44 and 55 as the cursor was moved to the end of line. In the gdb instance,
the visible line number pixel width was 55 with no fluctuation under the same
conditions as the non-gdb instance. This appears to be a different bug than
bug#32177 (current line number shifts one column to the left) because the line
number of the current line does not shift left, and changing the bidi settings
did not correct the issue.
- The current test for `auto_hscroll_mode_p' only looks for `current_line` and
all five related tests are based upon that assumption, which may not be true.
- Multiple Cursors: If point is in the middle of a composite character, then
select a fully composed character so that the fake cursor is visible.
- Implement functionality similar to the Lisp multiple-cursors by Magnar Sveen.
- Follow up with the Emacs team re bug#32177; i.e., (Current line number shifts
one column to the left.)
- Follow up with the Emacs team re bug#32060; i.e., Horizontal Scrolling
(Current Line): Wrong line gets h-scrolled.
- Determine if bug #28936 needs to be fixed and help the Emacs team re same.
2019_04_08__18_56_23_226.diff
Description: application/diff
- bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs).,
Keith David Bershatsky <=