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bug#47677: [PATCH] condition-case success continuation
From: |
Stefan Monnier |
Subject: |
bug#47677: [PATCH] condition-case success continuation |
Date: |
Sat, 10 Apr 2021 19:52:19 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
> This patch adds the condition-case handler syntax
>
> (:success BODY)
In the tests, you might want to add one with a lambda expression which
captures a mutated success variable, as in
(apply (condition-case res
42
(:success (prog1 (list (lambda (x) (+ res x)) res)
(setq res 0)))))
since this requires special handling in cconv.el.
Other than that, the patch looks good to me.
> Details of the syntax can be changed if there is a very good reason
> for it. Many other languages have more or less independently added
> equivalent constructs. Common Lisp's `handler-case` has a very similar
> feature (:no-error).
Any particular reason you chose ;success instead of :no-error?
> It would be nice to give `catch` the same treatment. A particularly
> flexible solution would be to add `catch` handlers to
> `condition-case`, which would then be able to handle
> everything. Unless there is a strong reason for doing it right away,
> it can be seen as a later improvement.
Let's take it one step at a time.
Stefan
- bug#47677: [PATCH] condition-case success continuation, Mattias Engdegård, 2021/04/09
- bug#47677: [PATCH] condition-case success continuation,
Stefan Monnier <=
- bug#47677: [PATCH] condition-case success continuation, Mattias Engdegård, 2021/04/11
- bug#47677: [PATCH] condition-case success continuation, Lars Ingebrigtsen, 2021/04/12
- bug#47677: [PATCH] condition-case success continuation, Stefan Monnier, 2021/04/12
- bug#47677: [PATCH] condition-case success continuation, Mattias Engdegård, 2021/04/12
- bug#47677: [PATCH] condition-case success continuation, Lars Ingebrigtsen, 2021/04/13
- bug#47677: [PATCH] condition-case success continuation, Mattias Engdegård, 2021/04/13
- bug#47677: [PATCH] condition-case success continuation, Lars Ingebrigtsen, 2021/04/14
- bug#47677: [PATCH] condition-case success continuation, Mattias Engdegård, 2021/04/15
- bug#47677: [PATCH] condition-case success continuation, Richard Stallman, 2021/04/16
- bug#47677: [PATCH] condition-case success continuation, Richard Stallman, 2021/04/16