Re: Improving 'pcase' documentation

[Dmitry Gutov]

On 19/11/2023 22:14, Jim Porter wrote:
> Does anyone have any particular feedback on these ideas, suggestions of 
> what would be the most beneficial, etc?

I don't have much to add at the moment, but the list sounds great.

Number 6 might be more difficult to do than the rest, since we currently 
don't have any support for context-local syntax (another example would 
be 'should' forms in ert tests) in completion/font-lock, and any such 
logic would have consider the level of quoting/unquoting, but ultimately 
it can be done.

> (I also think it'd be nice to font-lock anything that looks like 
",SYMBOL", even outside of 'pcase', but maybe others would find that 
annoying.)

And that sounds like a part of more general feature where local 
variables would be highlighted with font-lock-variable-name-face and 
font-lock-variable-use-face. To determine that ,foo is a variable 
declaration (inside a pcase form or anywhere) and not just a reference, 
font-lock would have to do some macro-expansion. I wonder what would be 
the performance implications of such general approach.