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Re: Questions about the `completing-read-function' interface

From: Stefan Monnier
Subject: Re: Questions about the `completing-read-function' interface
Date: Fri, 17 Apr 2015 14:04:13 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

>> M-x ivy-mode RET
>> M-x helm-mode RET
>> M-x ivy-mode RET
>> You should now have helm-mode active and working properly, yet with your
>> current code, helm-mode will be "enabled by inactive".  If you use
>> add/remove-function this case will be handled correctly.
> I meant to give an example of how `add-function' helps here.

That's exactly what the example does, AFAIK.

> Also, with your sequence of commands, starting from nothing, we have
> ivy-mode set to "t" and having the `completing-read-function'

No, the idea of this example is that after the second line ivy-mode is
still t but completing-read-function is now set to use the helm version.
After the 3rd line, with `setq' completing-read-function would be reset
to the default value, whereas with remove-function
completing-read-function would still continue using the helm version.

> I've also seen this type of code: ido-vertical-mode stores the variable
> `ido-decorations' of ido-mode and modifies it.  When you turn off
> ido-vertical-mode, it restores `ido-decorations'.  But what if other
> code has changed `ido-decorations' in the meantime, while
> ido-vertical-mode is still on?  Any way you put it, the result is
> incorrect. Unless there's a robust system behind it all that manages the
> `ido-decorations' variable.

That's exactly what add-function aims to solve.


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