Re: Find all the name and alias corresponding to a codepoint in Emacs.

[Eli Zaretskii <eliz@gnu.org>]

> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 12 Mar 2022 16:55:26 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> Now, I've enabled all the properties defined in "Describe Char Unidata List":
> 
> (setq describe-char-unidata-list
>       '(name old-name general-category canonical-combining-class
> bidi-class decomposition decimal-digit-value digit-value numeric-value
> mirrored iso-10646-comment uppercase lowercase titlecase)
>       )
> 
> 
> But `M-x describe-char ` still gives the following information:
> 
> ```
>              position: 1 of 1 (0%), column: 0
>             character: ` (displayed as `) (codepoint 96, #o140, #x60)
>               charset: ascii (ASCII (ISO646 IRV))
> code point in charset: 0x60
>                script: latin
>                syntax: '     which means: prefix
>              category: .:Base, a:ASCII, l:Latin, r:Roman
>              to input: type "C-x 8 RET 60" or "C-x 8 RET GRAVE ACCENT"
>           buffer code: #x60
>             file code: #x60 (encoded by coding system utf-8-unix)
>               display: by this font (glyph code):
>     ftcrhb:-PfEd-DejaVuSansMono Nerd Font
> Mono-regular-normal-normal-*-20-*-*-*-m-0-iso10646-1 (#x43)
> 
> Character code properties: customize what to show
>   name: GRAVE ACCENT
>   old-name: SPACING GRAVE
>   general-category: Sk (Symbol, Modifier)
>   canonical-combining-class: 0 (Spacing, split, enclosing, reordrant,
> and Tibetan subjoined)
>   bidi-class: ON (Other Neutrals)
>   decomposition: (96) ('`')
>   mirrored: N

Why is that a problem?  The properties that aren't shown are all nil,
so they are not interesting.  Emacs shows to you all the properties
whose values are useful.