Re: Better emoji support

[Robert Pluim <rpluim@gmail.com>]

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>>>>> On Sun, 19 Sep 2021 20:20:10 +0200, Robert Pluim <rpluim@gmail.com> said:

>>>>> On Sun, 19 Sep 2021 19:16:45 +0200, Kévin Le Gouguec <kevin.legouguec@gmail.com> said:
    Kévin> Juri Linkov <juri@linkov.net> writes:
    >>> Thanks, this is a nice change.  I have a problem only with one character.
    >>> Displaying NORTH EAST ARROW ↗ with emoji font is inappropriate to me.
    >>> 
    >>> If adding this character to the emoji script was not a mistake,
    >>> is it possible to customize this to display such characters
    >>> as a symbol like before?

    Kévin> admin/unidata/emoji-data.txt contains a whole section where "omitted
    Kévin> code points have Emoji_Presentation=No", and AFAICT NORTH EAST ARROW
    Kévin> is one of those omitted code points.

    Robert> True. But it has the 'Emoji' property.

    Kévin> IIUC, the Unicode standard means for those omitted characters to display
    Kévin> as "text" rather than as "emoji", unless they are followed by a
    Kévin> variation selector[1]; maybe some adjustments in fontset.el are in
    Kévin> order?

Eli also pointed out that this should depend on the presence of the
variation selector. Iʼll add that to the work Iʼm doing on emoji ZWNJ
sequences anyway (although given that the selector and the codepoints
will likely be using different fonts, Iʼm not sure we'll be able to
achieve this)

    Robert> As "text presentation" rather than "emoji presentation", not as
    Robert> "text". If we want to follow the Emoji_Presentation property, thatʼs
    Robert> easy enough to arrange.

As per the attached. If itʼs all OK Iʼll push tomorrow.

Robert
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From 3f7f622346f1c14bd5aa7e373e5f634a71b318ad Mon Sep 17 00:00:00 2001
From: Robert Pluim <rpluim@gmail.com>
Date: Sun, 19 Sep 2021 21:07:36 +0200
Subject: [PATCH] Base emoji script membership on Emoji_Presentation
To: emacs-devel@gnu.org

The Emoji property describes which codepoints can be displayed as
emoji, but Emoji_Presentation governs which are displayed as emoji by
default.

* admin/notes/unicode: Adjust check-emoji-coverage to look in the
Emoji_Presentation sections of emoji-data.txt
* admin/unidata/blocks.awk: Assign emoji script using the
Emoji_Presentation section.
---
 admin/notes/unicode      | 2 +-
 admin/unidata/blocks.awk | 7 +------
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/admin/notes/unicode b/admin/notes/unicode
index 9dc6f3bdca..0b2ce52794 100644
--- a/admin/notes/unicode
+++ b/admin/notes/unicode
@@ -100,7 +100,7 @@ FONT-NAME-REGEXP is checked using `string-match'."
 (save-excursion
 (goto-char (point-min))
 (let (res char name ifont)
-  (while (re-search-forward "; Emoji [^(]+(\\(.\\)[).\uFE0F]" nil t)
+  (while (re-search-forward "; Emoji_Presentation [^(]+(\\(.\\)[).]" nil t)
     (setq char (aref (match-string 1) 0))
     (setq ifont (car (internal-char-font nil char)))
     (when ifont
diff --git a/admin/unidata/blocks.awk b/admin/unidata/blocks.awk
index 6e52b52f67..29022bf7dd 100755
--- a/admin/unidata/blocks.awk
+++ b/admin/unidata/blocks.awk
@@ -202,12 +202,7 @@ FILENAME ~ "Blocks.txt" && /^[0-9A-F]/ {
     }
 }
 
-# The space after 'Emoji' is significant in the next two rules.
-# This purposely and deliberately excludes codepoints <= 00FF
-FILENAME ~ "emoji-data.txt" && /^00[0-9A-F][0-9A-F].*; Emoji / {
-    next
-}
-FILENAME ~ "emoji-data.txt" && /^[0-9A-F].*; Emoji / {
+FILENAME ~ "emoji-data.txt" && /^[0-9A-F].*; Emoji_Presentation / {
     sep = index($1, "..")
     len = length($1)
     if (sep > 0)  {
-- 
2.33.0.363.g4c719308ce