Re: How to use "smart kerning" font features in Emacs using composition-function-table

[Yuan Fu <casouri@gmail.com>]

On 11/28/23 6:20 AM, Eli Zaretskii wrote:
>> Date: Mon, 27 Nov 2023 21:18:18 -0800
>> From: Yuan Fu <casouri@gmail.com>
>>
>>
>>
>> On 11/27/23 4:03 AM, Eli Zaretskii wrote:
>>>> From: Steve Molitor <stevemolitor@gmail.com>
>>>> Date: Sun, 26 Nov 2023 14:42:36 -0600
>>>> Cc: emacs-devel@gnu.org
>>>>
>>>> For ligature support, I do need something like this for Commit Mono:
>>>>
>>>>       (set-char-table-range
>>>>        composition-function-table
>>>>        t
>>>>        `([" [,-.:;A-Z_a-z><=!&|+-?/\\]+" 0 font-shape-gstring]))
>>> Beware: composition-function-table is global, so the above will ligate
>>> characters on the mode line as well, which might not be what you want.
>> Is there any way to make it local? If I make composition-function-table
>> buffer-local and set the buffer-local variable, would it work?
> It will work to affect compositions when the buffer is the current
> one, but it will not work to avoid compositions on the mode line of
> the window(s) which display(s) that buffer.
Cool!
>> The use-case I'm thinking about is using Commit Mono for Info
>> buffers and help buffers, which have large bodies of monospaced
>> text. The improved readability would help a lot there.
> I think if you like these features enough, you should want it in any
> major mode that displays human-readable text.  But that's me.

I tend to you variable width fonts for human-readable text whenever 
possible. But for Info and help buffers, very often the content relies 
on monospacing for text layout. So I can't use variables-width font for 
those.

Yuan