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bug#9793: 24.0.90; Unwanted tramp connection on eshell completion.

From: Stefan Monnier
Subject: bug#9793: 24.0.90; Unwanted tramp connection on eshell completion.
Date: Tue, 25 Oct 2011 08:16:31 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.90 (gnu/linux)

> Tramp has some code to guess whether it is in completion mode.


> Check of `non-essential' is one proof,

Actually, no.  non-essential could be used for other things than completion.

> checking the last keyboard input (being TAB, or not) is another one.


> If Tramp finds out that it is in completion mode, it suppresses some
> remote actions, like expand-file-name. Since your code 
> (let ((default-directory "/")) (file-directory-p "tequila:"))
> does not show an evidence of the completion mode, all remote actions are
> performed.

OK, so now I know why the two behaved differently.

> The actions for `file-directory-p' are never been suppressed, that's why
> Tramp performs them also when being in completion mode.


>> In shell-mode completion also understands Tramp file names (yup, that's
>> a bug, we should probably default comint-file-name-prefix to "/:/"), so
>> that's not the problem.
> Better not. There are still needed checks in shell.el, which are applied
> to remote files. `comint-file-name-prefix keeps the remote part of those
> files.

I do not propose to remove the variable.  Only to make it default to
"/:/" (instead of just "").

>>> But this makes the trouble with the completion predicate
>>> `file-directory-p'.
>> Yup, I think we should somehow make it so Tramp can say
>> (file-directory-p "/tequila:") => t
>> without trying to connect to tequila (after all, even if we can't
>> connect to tequila, this is still a "directory", just one we currently
>> can't access).
> That was the intention of my patch :-)
> Return t in case of remote files.

But that's not what I suggest.  I suggest to "blindly" return t for
/<host>: only (as well as things like /ssh:<host>: I guess), but not for
/<host>:<path> where we'd still connect and test whether it's indeed
a directory.

> Inside Tramp it could be behave such a way when it detects it is in
> completion mode. That means, when `non-essential' is set to t. Shall I
> do it this way?

I suggest to do that regardless of whether we're in completion mode
or not.


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