Find file locally from Tramp buffer

Find file locally from Tramp buffer

[Alexander Shukaev]

Hey everyone,

Suppose I run builds on a dedicated build machine with `compile' via 
Tramp.  When there is an error displayed and one follows it, clearly 
Emacs tries to access the corresponding file remotely.  But in my case, 
I have mounted the same source code directory structure as is on the 
build machine in order to develop the code locally.  Hence, it would be 
nice to somehow teach Emacs to first probe whether it can access the 
corresponding file locally, and if not, fallback to accessing it 
remotely via Tramp.  It would also be nice if the implementation of this 
feature would apply not only to compilation buffers, but would be rather 
located on a lower level to intercept all file finding requests from 
Tramp buffers.

I do realize that the use case is very special and is not meant for 
broad audience, so this should not be considered as a feature request. 
That is I merely want to know how to implement it properly on my own. 
Any suggestions or ideas on improvement or generalization of this idea 
are very welcome.

Kind regards,
Alexander

Re: Find file locally from Tramp buffer

[tomas]

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On Wed, Jan 06, 2016 at 08:35:52PM +0100, Alexander Shukaev wrote:
> Hey everyone,
> 
> Suppose I run builds on a dedicated build machine with `compile' via
> Tramp. [...]
> it would be nice to somehow teach Emacs to first probe whether it
> can access the corresponding file locally, and if not, fallback to
> accessing it remotely via Tramp [...]

> I do realize that the use case is very special and is not meant for
> broad audience [...]

This isn't as crazy as it sounds. Actually I would have had use for
that from time to time.

Kind of a file name mapping layer (perhaps the local files have a
somewhat different path, typically one could get away by re-mapping
some stem of the complete path).

Hmmm.

regards
- -- t
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Re: Find file locally from Tramp buffer

[Michael Albinus]

<tomas@tuxteam.de> writes:

> On Wed, Jan 06, 2016 at 08:35:52PM +0100, Alexander Shukaev wrote:
>> Hey everyone,
>>
>> Suppose I run builds on a dedicated build machine with `compile' via
>> Tramp. [...]
>> it would be nice to somehow teach Emacs to first probe whether it
>> can access the corresponding file locally, and if not, fallback to
>> accessing it remotely via Tramp [...]
>
>> I do realize that the use case is very special and is not meant for
>> broad audience [...]
>
> This isn't as crazy as it sounds. Actually I would have had use for
> that from time to time.
>
> Kind of a file name mapping layer (perhaps the local files have a
> somewhat different path, typically one could get away by re-mapping
> some stem of the complete path).

In the compilation buffer, the buffer-local variable `default-directory'
points to the remote directory. If you change it to the corresponding
local directory path, it could do the trick. Just call in that buffer
"M-x cd".

> regards
> -- t

Best regards, Michael.

Re: Find file locally from Tramp buffer

[tomas]

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On Thu, Jan 07, 2016 at 09:14:21PM +0100, Michael Albinus wrote:
> <tomas@tuxteam.de> writes:

[...]

> > Kind of a file name mapping layer [...]

> In the compilation buffer, the buffer-local variable `default-directory'
> points to the remote directory. If you change it to the corresponding
> local directory path, it could do the trick. Just call in that buffer
> "M-x cd".

Wow, thanks Michael. Will have to give that a try :-)

regards
- -- t
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