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bug#29373: 24.5; doc string of `self-insert-uses-region-functions'
From: |
Eli Zaretskii |
Subject: |
bug#29373: 24.5; doc string of `self-insert-uses-region-functions' |
Date: |
Fri, 24 Nov 2017 12:50:42 +0200 |
> Date: Mon, 20 Nov 2017 18:56:15 -0800 (PST)
> From: Drew Adams <drew.adams@oracle.com>
>
> Two lines of the doc string are too long.
Longer than 79 characters? I didn't find any such lines.
> The doc string is close to incomprehensible.
Such derogatory remarks are best kept out of bug reports. The facts
are grave enough to tell we should fix this.
> Special hook to tell if `self-insert-command' will use the region.
> It must be called via `run-hook-with-args-until-success' with no arguments.
> Any `post-self-insert-command' which consumes the region should
> register a function on this hook so that things like `delete-selection-mode'
> can refrain from consuming the region.
>
> HOW does this hook "tell if `self-insert-command' will use the region"?
> What does a function on this hook need to do or return, to tell that?
> And what does it mean for `self-insert-command' to "use the region"?
>
> What does "any `post-self-insert-command'" even mean? What is meant by
> "consumes the region"? Does "consume" mean the same thing in each
> occurrence here? What is meant by "registering" a function on a hook?
post-self-insert-command really meant to refer to post-self-insert-hook.
> A guess is that this is just a way to conditionalize the treatment of
> `self-insert-command' by `delete-selection-mode'. In some mode
> (`electric-pair-mode'), you want to use a certain function as the value
> of property `delete-selection' for symbol `self-insert-command'.
>
> If so, then things would likely be clearer if that was said.
I clarified that.
> In that case, it needs to be understood that `delete-selection-mode'
> checks the value of property `delete-selection' on
> `self-insert-command', and if that value is nil or is a function that
> returns nil then `delete-selection-mode' does nothing.
The first part was already in delsel.el. I made clear that
self-insert-command uses this hook via delete-selection-uses-region-p.
> Say that, together with the fact that the function value of property
> `delete-selection-mode' for `self-insert-command' runs the hook
> functions in order, returning nil if any of them returns non-nil.
This is the usual behavior of run-hook-with-args-until-success.
> So a function on the hook should return non-nil when its aim is to
> prevent deletion of the region by `self-insert-command'. Say that.
Done.