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emacs-28 525602d: ; * etc/TODO (display): Add entry about Default_Ignora
From: |
Eli Zaretskii |
Subject: |
emacs-28 525602d: ; * etc/TODO (display): Add entry about Default_Ignorables. |
Date: |
Fri, 8 Oct 2021 03:27:54 -0400 (EDT) |
branch: emacs-28
commit 525602d68200ae79d853e8f2bf525b3d966dd819
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>
; * etc/TODO (display): Add entry about Default_Ignorables.
---
etc/TODO | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/etc/TODO b/etc/TODO
index ffc5ef3..cd06b1e 100644
--- a/etc/TODO
+++ b/etc/TODO
@@ -444,6 +444,25 @@ consistency checks that make sure the new code computes
the same results
as the old code. And once that works well, we can remove the old code
and old fields.
+** Implement Unicode-compliant display of "default-ignorable" characters
+See the "Characters Ignored for Display" section of paragraph 5.21 in
+the Unicode Standard for the details.
+
+The implementation would import the data from Unicode UCD file
+DerivedCoreProperties.txt, and provide a minor mode that arranges for
+the characters with the Default_Ignorable_Code_Point (DI) property to
+be hidden on display. One way of implementing that could be via
+glyphless-char-display-control; that one is global, but maybe there's
+a way of making it buffer-local. Alternatively, this could be
+implemented in C in the display engine.
+
+An additional aspect of this is the display of U+00AD SOFT HYPHEN as
+invisible except at line boundaries. Note that this would need to
+support hard (physical) newlines in the buffer as well as soft
+wrapping of long lines under 'visual-line-mode'. The algorithm for
+selecting the wrap point may also need be changed to break at the soft
+hyphen.
+
** FFI (foreign function interface)
See eg https://lists.gnu.org/r/emacs-devel/2013-10/msg00246.html
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