[TRAMP] Setting remote prompt

[TRAMP] Setting remote prompt

[Loris Bennett]

Hi,

When logged in on a remote machine I have the following prompt:

  [09:15:09] loris@pi (1000) ~
  $ echo $PS1
  \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$

When I access a file on the remote machine via TRAMP and then do 'M-x
shell', I get:

  ^[]2;loris@pi^G[09:42:03] loris@pi (30) ~
  $ echo $PS1
  \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$

where ^[ and ^G are the non-printable characters  and \a respectively.

I see that here:

  https://www.gnu.org/software/tramp/#Remote-shell-setup

the way to reset the prompt via ~/.emacs_SHELLNAME is described.

However, I was wondering if there is just a simple way to prevent TRAMP
from adding a default prompt to the front of the existing prompt (if,
indeed, that is what is happening).

Does anyone one have any advice?

Cheers,

Loris

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Re: [TRAMP] Setting remote prompt

[Michael Albinus]

"Loris Bennett" <loris.bennett@fu-berlin.de> writes:

> Hi,

Hi Loris,

> However, I was wondering if there is just a simple way to prevent TRAMP
> from adding a default prompt to the front of the existing prompt (if,
> indeed, that is what is happening).
>
> Does anyone one have any advice?

I'm not aware that Tramp sets this prompt as you have shown. Maybe you
run your test with tramp-verbose being 6, and check Tramp's debug
buffer. Tramp sets PS1, but not the way it happens to you.

> Cheers,
>
> Loris

Best regards, Michael.

Re: [TRAMP] Setting remote prompt

[Loris Bennett]

"Loris Bennett" <loris.bennett@fu-berlin.de> writes:

> Hi,
>
> When logged in on a remote machine I have the following prompt:
>
>   [09:15:09] loris@pi (1000) ~
>   $ echo $PS1
>   \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$
>
> When I access a file on the remote machine via TRAMP and then do 'M-x
> shell', I get:
>
>   ^[]2;loris@pi^G[09:42:03] loris@pi (30) ~
>   $ echo $PS1
>   \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$
>
> where ^[ and ^G are the non-printable characters  and \a respectively.
>
> I see that here:
>
>   https://www.gnu.org/software/tramp/#Remote-shell-setup
>
> the way to reset the prompt via ~/.emacs_SHELLNAME is described.
>
> However, I was wondering if there is just a simple way to prevent TRAMP
> from adding a default prompt to the front of the existing prompt (if,
> indeed, that is what is happening).
>
> Does anyone one have any advice?

Looking again I see that PS1 isn't changed, so the difference is
probably due to the way the prompt is interpreted by the terminal.

First I need to work out what the first instance of '\u@\h' is there
for, as it's been a few years since I set it up.

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Re: [TRAMP] Setting remote prompt

[Yuri Khan]

On Tue, Apr 24, 2018 at 3:15 PM, Loris Bennett
<loris.bennett@fu-berlin.de> wrote:
> "Loris Bennett" <loris.bennett@fu-berlin.de> writes:
>>   $ echo $PS1
>>   \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$
>
> First I need to work out what the first instance of '\u@\h' is there
> for, as it's been a few years since I set it up.

OSC 2;\u@\h BEL

In xterm and its derivatives, this sets your window title to the
current user@host.

Re: [TRAMP] Setting remote prompt

[Loris Bennett]

Yuri Khan <yuri.v.khan@gmail.com> writes:

> On Tue, Apr 24, 2018 at 3:15 PM, Loris Bennett
> <loris.bennett@fu-berlin.de> wrote:
>> "Loris Bennett" <loris.bennett@fu-berlin.de> writes:
>>>   $ echo $PS1
>>>   \[\033]2;\u@\h\a\]\[\e[35m\][\t] \[\e[31m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$
>>
>> First I need to work out what the first instance of '\u@\h' is there
>> for, as it's been a few years since I set it up.
>
> OSC 2;\u@\h BEL
>
> In xterm and its derivatives, this sets your window title to the
> current user@host.

Yes, you are right.  So it wasn't the text that was dim, it was me :-)

So I guess I should be adding that bit conditionally depending on the
type of terminal. 

Cheers,

Loris

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Re: [TRAMP] Setting remote prompt

[Loris Bennett]

Hi Michael,

Michael Albinus <michael.albinus@gmx.de> writes:

> "Loris Bennett" <loris.bennett@fu-berlin.de> writes:
>
>> Hi,
>
> Hi Loris,
>
>> However, I was wondering if there is just a simple way to prevent TRAMP
>> from adding a default prompt to the front of the existing prompt (if,
>> indeed, that is what is happening).
>>
>> Does anyone one have any advice?
>
> I'm not aware that Tramp sets this prompt as you have shown. Maybe you
> run your test with tramp-verbose being 6, and check Tramp's debug
> buffer. Tramp sets PS1, but not the way it happens to you.

Yes, you are right.  The problem is that I have PROMPT_COMMAND set to a
function that exports PS1.  I had fixed the problem but not propagated
the solution to all other machines.  The correct prompt looks like this:

  \[\e[35m\][\t] \[\e[32m\]\u@\h \[\e[36m\](\!) \[\e[33m\]\w\[\e[34m\]\[\033[0m\]\n$

The extraneous symbols were coming from the following fragment

  \[\033]2;\u@\h\a\]

which seems to be some sort of attempt to use the text attribute "dim"
(2;), which is ignored or not displayed for most of my terminals, but
produces

  ^[]2;loris@pi^G

when the shell is run with Emacs.

Sorry for the noise.

Cheers,

Loris

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Re: [TRAMP] Setting remote prompt

[Ben Bacarisse]

"Loris Bennett" <loris.bennett@fu-berlin.de> writes:
<snip>
> The extraneous symbols were coming from the following fragment
>
>   \[\033]2;\u@\h\a\]
>
> which seems to be some sort of attempt to use the text attribute "dim"
> (2;), which is ignored or not displayed for most of my terminals, but
> produces

No.  Leaving the enclosing []s aside, the sequence is

  ESC ] 2; <string> BEL

with \033 being ESC and \a being BEL.  This sequence is used to set the
window title.

-- 
Ben.

Re: [TRAMP] Setting remote prompt

[Ben Bacarisse]

Ben Bacarisse <ben.usenet@bsb.me.uk> writes:

> "Loris Bennett" <loris.bennett@fu-berlin.de> writes:
> <snip>
>> The extraneous symbols were coming from the following fragment
>>
>>   \[\033]2;\u@\h\a\]
>>
>> which seems to be some sort of attempt to use the text attribute "dim"
>> (2;), which is ignored or not displayed for most of my terminals, but
>> produces
>
> No.  Leaving the enclosing []s aside, the sequence is
>
>   ESC ] 2; <string> BEL
>
> with \033 being ESC and \a being BEL.  This sequence is used to set the
> window title.

Sorry, I see you corrected this.  Should have finished the thread before
replying!

-- 
Ben.