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bug#54459: 29.0.50; Simplify connection-local variables (feature request
From: |
Michael Albinus |
Subject: |
bug#54459: 29.0.50; Simplify connection-local variables (feature request) |
Date: |
Sun, 20 Mar 2022 19:17:18 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Ergus <spacibba@aol.com> writes:
Hi,
> Suppose:
>
> C-x C-f /ssh:myhost:file1
> C-x C-f /ssh:myhost:file2
> (executable-find mycommand 1)
> And here we set the connection local variable...
>
> When we go to file1 if does not know about the variable in spite of it
> is in the same host.
I recommend to move the code setting connection-local variables in a
funcion called by a hook, which is applied when visiting files in your
use case.
>>--8<---------------cut here---------------start------------->8---
>>(connection-local-set-profile-variables
>> 'profile
>> (append
>> (connection-local-get-profile-variables 'profile)
>> my-variables-list))
>>--8<---------------cut here---------------end--------------->8---
>>
> Could you consider to add a snippet in the documentation explaining
> this? Please?
Done in the Elisp manual, pushed to master as commit aec44a5be3.
>>That's hard to do. A user could change the remote PATH while the result
>>of executable-find is cached. Furthermore, Tramp appends the local part
>> of the remote default-directory to the directory search list.
>
> SO this means that the executable in default-directory are also
> considered? Like on Windows? I was not aware of that...
Well, this is rather an implementation detail, not documented. And I'm
not sure it is the best decision, we just needed a last element in
exec-path which is comparable to the last element in the local case of
exec-path.
>>You could write your own function, using Tramp's cache mechanism, but at
>>your own risk. Something like (untested)
>>
>>--8<---------------cut here---------------start------------->8---
>>(defun my-executable-find (command &optional remote)
>> (if (and remote (file-remote-p default-directory))
>> (with-tramp-connection-property
>> (tramp-get-process (tramp-dissect-file-name default-directory))
>> (concat "executable-find-" command)
>> (executable-find command remote))
>> (executable-find command remote)))
>>--8<---------------cut here---------------end--------------->8---
>>
> I was thinking in something like:
>
> (executable-find command &optional remote cache) but basically the same idea.
This cannot be generalized, the code uses Tramp specific functions. A
remote file name does not always mean invoking Tramp ...
> Thanks,
> Ergus
Best regards, Michael.