Re: Line wrap reconsidered

[Yuan Fu <casouri@gmail.com>]

> On May 26, 2020, at 3:50 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Tue, 26 May 2020 13:34:01 -0400
>> Cc: larsi@gnus.org,
>> emacs-devel@gnu.org
>> 
>> I fixed the problems and it now works. If you apply the patch below and load kinsaku.el, open the test.txt and M-x toggle-word-wrap. You should see the text properly wrapped: wrapping between CJK characters and whitespaces but not between ASCII characters. Also according to kinsoku rules, CJK comma will not be placed at the beginning of a line; CJK “《” will not be place at the end of a line, etc.
>> 
>> It determines whether we can wrap before/after a character by looking at “<“, “>” and “|” categories, roughly corresponding to “don’t wrap before”, “don’t wrap after” and “wrap before and after”. 
> 
> Thanks.
> 
> This still doesn't support strings, only buffer text.
> 
> Also, why are you putting a text property, instead of just examining
> the category as part of IT_CAN_WRAP?  What do you need the property
> for?
> 

I don’t really know which way is better/more efficient and just took one to implement. Plus text property might allow some user customizations. I can change it to only use category table. 

> And finally, this feature must be optional, so some customization
> knobs are missing.  But we could defer this until the basic code is in
> good shape.

Cool.

I saw someone mentioning Line_Break.txt from unicode and looked it up, unicode commission has already marked out all wrap-able code points. IIUC we can add Line_Break.txt to admin/unidat and parse it and put a elisp file under /lisp/international, right? We can categoarize all the marked code points into three categories as I mentioned earlier. 

Yuan