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Re: Escaping a string for substitute-command-keys

From: Clément Pit-Claudel
Subject: Re: Escaping a string for substitute-command-keys
Date: Thu, 3 Oct 2019 12:46:50 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 2019-10-03 12:31, Eli Zaretskii wrote:
>> From: Clément Pit-Claudel <address@hidden>
>> Date: Thu, 3 Oct 2019 09:52:31 -0400
>> I think I've seen a thread about this in the past, but I can't find it. 
>> What's the expected way to escape a string before its fed to 
>> substitute-command-keys, so that substitute-command-keys reconstructs the 
>> original string?
>> The reason for this question is that since 2015 Emacs has been calling 
>> substitute-command-keys on help-echo messages, which breaks flycheck and 
>> flymake (a simple way to reproduce the issue is to enable flymake in a 
>> Python buffer containing just xxx and to hover over the xxx with the mouse: 
>> Emacs shows a tooltip containing "Undefined name ’xxx’").
>> So, what's the right way to escape a string to be fed to 
>> substitute-command-keys?  Alternatively, is there be a way to disable the 
>> transformation for a particular help-echo string, rather than forcing an 
>> unnecessary rountrip?  Maybe we could add a text property, so that if a 
>> string is tagged with a 'text-quoting-style property that style is used 
>> instead of the default one?
> If I understand what you are looking for, the answer is in the manual:
> quote any character with \= (in a Lisp string, that's "\\=", of
> course).  See the node "Keys in Documentation" in the ELisp manual.

I saw that part in the manual, but I was looking for a function that would do 
that.  Is there an easy way to tell what needs escaping, or should I just 
escape all `, ', and \? (and if so, should we add a function that does that to 
subr-x.el or somewhere similar?)


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