From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Tramp shows no user/host completions (solved while writing)
Date: Sun, 27 Oct 2019 17:30:19 -0400 [thread overview]
Message-ID: <jwv1rux7v0e.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 874kzuy5v3.fsf@gmx.de
>>> (file-name-all-completions "ssh" "/") ;; for `partial-completion'
>>>
>>> or
>>>
>>> (file-name-all-completions "" "/") ;; for `substring' and `flex'
>>>
>>> or even no call for `initials'.
>>
>> Would you consider that a bug?
It's clearly not the desired outcome.
Here's why this happens for example in the case of partial-completion:
when partially-completing "/ssh:f" the style would like to accept
anything of the form "/ssh<blabla>:f<blabla>" (or in glob-style:
"/ssh*:f*", which incidentally partial-complete also accepts as input).
Since the underlying completion functions only work for prefix
completion, the way this is implemented is to get all the prefix
completions of "/ssh" and then filter those that match "/ssh*:f*".
Now for Tramp, it's virtually impossible to really list all the possible
completions of "/ssh" such that the subsequent filtering works as
intended. We could try and handle a few "typical" cases, but for
example "/ssh:otheruser@otherhos" will be difficult because we'd have to
make the prefix completion of "/ssh" return all the possible
"/ssh:<someuser>@<somehost>" for that (remember: Tramp's completion code
isn't told that "otheruser@otherhos" has already been typed in).
Another approach would be to try and handle "/ssh:f" more like "/ssh/f":
i.e. first ask the backend to find the completions for "/ssh*:" and then
with each of the results ask the backend again to find the subsequent
completions (i.e. prefix completions for "/ssh:f", "/sshx:f", ...).
This is definitely possible by modifying completion-file-name-table,
more specifically the `boundaries` part of it, to make it aware of
Tramp's syntax (or ideally, to add hooks that let Tramp explain it to
the generic code).
Stefan
next prev parent reply other threads:[~2019-10-27 21:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 16:01 Tramp shows no user/host completions (solved while writing) Tassilo Horn
2019-10-24 16:47 ` Drew Adams
2019-10-24 19:40 ` Michael Albinus
2019-10-24 20:08 ` Drew Adams
2019-10-24 19:36 ` Michael Albinus
2019-10-24 19:45 ` Tassilo Horn
2019-10-25 5:00 ` Tassilo Horn
2019-10-25 14:38 ` Michael Albinus
2019-10-26 21:51 ` Tassilo Horn
2019-10-27 8:01 ` Michael Albinus
2019-10-27 21:30 ` Stefan Monnier [this message]
2019-10-28 6:57 ` Tassilo Horn
2019-10-28 7:44 ` Michael Albinus
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