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bug#64351: probabe bug associated with “completion-regexp-list”
From: |
Shynur Xie |
Subject: |
bug#64351: probabe bug associated with “completion-regexp-list” |
Date: |
Fri, 30 Jun 2023 19:36:44 +0000 |
> Stefan> I'd be interested to hear about your use-case, tho.
I tried to filter out internal variables “*--*” when typing “C-h v”
several days ago, so I wrote this:
(advice-add 'describe-variable :around ;“C-h v”
(lambda (advice-added-function &rest arguments)
(let ((completion-regexp-list
'("^\\([^-]*$\\|\\([^-]+\\(-[^-]+\\)-?\\)\\)$")))
(apply advice-added-function arguments))))
It didn’t work. I wanted to find out why, so to save time, I set its
value globally:
(setq completion-regexp-list
'("^\\([^-]*$\\|\\([^-]+\\(-[^-]+\\)-?\\)\\)$"))
Somehow, Emacs threw an error. I guess this is a bug, so I tried to
narrow it down and then reported it.
> Stefan> Maybe I can provide a good alternative.
I think it would be nice if Emacs can provides an option, say,
“completions-filter-function” (or “completions-help-filter-function”
only for functions “describe-*”), which receives 2 arguments -- TYPE
and COMPLETION. If I evaluate:
(setq completions-filter-function
(lambda (type completion)
(pcase type
('variable
(not (string-match-p "--" (symbol-name completion)))))))
I can filter out “*--*” variables. It’s also easier to add other
rules than the original “completion-regexp-list”. Using regexp to
filter is not very convenient, say if I want to filter out
“*-internal”, I have to write this regexp:
"\\([^l]\\|[^a]l\\|[^n]al\\|[^r]nal\\|[^e]rnal\\|[^t]ernal\\|[^n]ternal\\|[^i]nternal\\|[^-]internal\\)$"
I don’t know whether “completions-filter-function” is a good idea, I’m
just making a suggestion. Thanks.
bug#64351: probabe bug associated with “completion-regexp-list”, Stefan Monnier, 2023/06/30
bug#64351: probabe bug associated with “completion-regexp-list”, Shynur Xie, 2023/06/30
bug#64351: probabe bug associated with “completion-regexp-list”, Eli Zaretskii, 2023/06/30