GNU logs - #79253, boring messages

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Subject: bug#79253: Add timestamps to *Messages*
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Hi all:

I am trying to debug a Tramp problem, and I need associate Tramp debug log entries with entries in the *Messages* buffer.

This is hard to do, because the *Messages* buffer has no timestamps.

Some other people have had this problem before:

https://emacs.stackexchange.com/questions/32150/how-to-add-a-timestamp-to-each-entry-in-emacs-messages-buffer

The trouble is, there is not one solution, but a few of them, with different activation procedures. I gets complicated because minibuffer vs *Messages*, and because of the "[3 times]" markers upon repetition.

I am not very proficient at Lisp, and I couldn't make it out. The "advice" method is a kludge anyway.

Could you implement an easy way to add timestamps to the *Messages* buffer?

Thanks in advance,
   rdiez

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: "R. Diez" <rdiez-2006@HIDDEN>
Subject: bug#79253: Acknowledgement (Add timestamps to *Messages*)
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Date: Sat, 16 Aug 2025 07:38:04 +0000

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X-Loop: help-debbugs@HIDDEN
Subject: bug#79253: Add timestamps to *Messages*
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"R. Diez" via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> Hi all:

Hi,

> I am trying to debug a Tramp problem, and I need associate Tramp debug log entries with entries in the *Messages* buffer.
>
> This is hard to do, because the *Messages* buffer has no timestamps.
>
> Some other people have had this problem before:
>
> https://emacs.stackexchange.com/questions/32150/how-to-add-a-timestamp-to-each-entry-in-emacs-messages-buffer
>
> The trouble is, there is not one solution, but a few of them, with different activation procedures. I gets complicated because minibuffer vs *Messages*, and because of the "[3 times]" markers upon repetition.
>
> I am not very proficient at Lisp, and I couldn't make it out. The "advice" method is a kludge anyway.
>
> Could you implement an easy way to add timestamps to the *Messages* buffer?

What is wrong with Tramp's debug buffers? They provide timestamps.

Personally, I don't believe we shall add such a general "improvement" to
the *Messages* buffer. It is a simple mean to show messages sent to
it. The contents of a message, including a timestamp, is the
responsibility of the sender.

But that's my understanding; people might see it different.

> Thanks in advance,
>   rdiez

Best regards, Michael.

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Subject: bug#79253: Add timestamps to *Messages*
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"R. Diez" via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> Hi all:

Hi,

> I am trying to debug a Tramp problem, and I need associate Tramp debug log entries with entries in the *Messages* buffer.
>
> This is hard to do, because the *Messages* buffer has no timestamps.
>
> Some other people have had this problem before:
>
> https://emacs.stackexchange.com/questions/32150/how-to-add-a-timestamp-to-each-entry-in-emacs-messages-buffer
>
> The trouble is, there is not one solution, but a few of them, with different activation procedures. I gets complicated because minibuffer vs *Messages*, and because of the "[3 times]" markers upon repetition.
>
> I am not very proficient at Lisp, and I couldn't make it out. The "advice" method is a kludge anyway.
>
> Could you implement an easy way to add timestamps to the *Messages* buffer?

What is wrong with Tramp's debug buffers? They provide timestamps.

Personally, I don't believe we shall add such a general "improvement" to
the *Messages* buffer. It is a simple mean to show messages sent to
it. The contents of a message, including a timestamp, is the
responsibility of the sender.

But that's my understanding; people might see it different.

> Thanks in advance,
>   rdiez

Best regards, Michael.

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> Date: Fri, 15 Aug 2025 21:40:39 +0200
> From:  "R. Diez" via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> Hi all:
> 
> I am trying to debug a Tramp problem, and I need associate Tramp debug log entries with entries in the *Messages* buffer.
> 
> This is hard to do, because the *Messages* buffer has no timestamps.
> 
> Some other people have had this problem before:
> 
> https://emacs.stackexchange.com/questions/32150/how-to-add-a-timestamp-to-each-entry-in-emacs-messages-buffer
> 
> The trouble is, there is not one solution, but a few of them, with different activation procedures. I gets complicated because minibuffer vs *Messages*, and because of the "[3 times]" markers upon repetition.
> 
> I am not very proficient at Lisp, and I couldn't make it out. The "advice" method is a kludge anyway.
> 
> Could you implement an easy way to add timestamps to the *Messages* buffer?

Did you try using set-message-function to install your function as the
one that adds a time stamp to the text of the message to be shown?  If
you tried, and it didn't work, please tell what didn't work.  If you
didn't try, please do.

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> What is wrong with Tramp's debug buffers? They provide timestamps.

I suspect that some Tramp connection timeout messages only appear in the *Messages* buffer, and not in Tramp's debugger buffer, or they appear with a long delay. That is why I wanted to correlate.

In any case, I should have phrased this feature request differently. It is not about Tramp, it is a general feature request for *Messages* which could help in other scenarios, like correlating Emacs events with external logs, or just checking how much time has passed between 2 messages in that buffer, or how long ago some event I am trying to troubleshoot happened.

> Personally, I don't believe we shall add such a general "improvement" to
> the *Messages* buffer. It is a simple mean to show messages sent to
> it. The contents of a message, including a timestamp, is the
> responsibility of the sender.

I have a different opinion. 8-)

It is impractical for the sender to add timestamps. There are thousands of senders. And how are they going to agree the time format?

Other log systems or log windows add the timestamps automatically. In the command line, I can use a tool like 'ts' from moreutils in order to prepend a timestamp to every line of input you give it. But that wouldn't work with the *Messages* buffer.

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>> Could you implement an easy way to add timestamps to the *Messages* buffer?
> 
> Did you try using set-message-function to install your function as the
> one that adds a time stamp to the text of the message to be shown?  If
> you tried, and it didn't work, please tell what didn't work.  If you
> didn't try, please do.

First of all, thanks for the hint. The 'message' function does not mention 'set-message-function' or the like, so I missed it.

I could find very little information about 'set-message-function', and no examples whatsoever, so I came up with this:

(defun my-message-function (msg)
   "" ; No docstring yet.
   (concat "Test: " msg))

(setq set-message-function #'my-message-function)

The effect is that messages in the minibuffer do get the "Test:" prefix, but messages in the *Messages* buffer do not.

But that is exactly the opposite of what I am trying to achieve!

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"R. Diez" via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

Hi,

>> What is wrong with Tramp's debug buffers? They provide timestamps.
>
> I suspect that some Tramp connection timeout messages only appear in
> the *Messages* buffer, and not in Tramp's debugger buffer, or they
> appear with a long delay. That is why I wanted to correlate.

FTR: any message from Tramp sent to *Messages* is also sent to the
respective Tramp debug buffer, if such buffer is in place. It is
created, when tramp-verbose is greater than 3. All of this is explained
in (info "(tramp) Traces and Profiles") .

Best regards, Michael.

X-Loop: help-debbugs@HIDDEN
Subject: bug#79253: Add timestamps to *Messages*
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"R. Diez" via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

Hi,

>> What is wrong with Tramp's debug buffers? They provide timestamps.
>
> I suspect that some Tramp connection timeout messages only appear in
> the *Messages* buffer, and not in Tramp's debugger buffer, or they
> appear with a long delay. That is why I wanted to correlate.

FTR: any message from Tramp sent to *Messages* is also sent to the
respective Tramp debug buffer, if such buffer is in place. It is
created, when tramp-verbose is greater than 3. All of this is explained
in (info "(tramp) Traces and Profiles") .

Best regards, Michael.

X-Loop: help-debbugs@HIDDEN
Subject: bug#79253: Add timestamps to *Messages*
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Date: Sun, 17 Aug 2025 09:53:26 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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severity 79253 wishlist
thanks

> Date: Sat, 16 Aug 2025 23:01:50 +0200
> Cc: 79253 <at> debbugs.gnu.org
> From: "R. Diez" <rdiez-2006@HIDDEN>
> 
> 
> >> Could you implement an easy way to add timestamps to the *Messages* buffer?
> > 
> > Did you try using set-message-function to install your function as the
> > one that adds a time stamp to the text of the message to be shown?  If
> > you tried, and it didn't work, please tell what didn't work.  If you
> > didn't try, please do.
> 
> First of all, thanks for the hint. The 'message' function does not mention 'set-message-function' or the like, so I missed it.
> 
> I could find very little information about 'set-message-function', and no examples whatsoever, so I came up with this:
> 
> (defun my-message-function (msg)
>    "" ; No docstring yet.
>    (concat "Test: " msg))
> 
> (setq set-message-function #'my-message-function)
> 
> The effect is that messages in the minibuffer do get the "Test:" prefix, but messages in the *Messages* buffer do not.
> 
> But that is exactly the opposite of what I am trying to achieve!

OK, thanks for testing.

One problem with your request is that Emacs many times generates
messages by multiple calls to the 'message' function.  Prepending the
current time to each message passed to 'message' will thus produce
somewhat sub-optimal, maybe even ugly, results.  For example, if you
type C-p at the first line of a buffer, Emacs signals an error that
logs in the *Messages* buffer as

  previous-line: Beginning of buffer

But if we prepend each logged message with current time, it will
instead look like this:

  17/08/2025 00:09:44 previous-line
  17/08/2025 00:09:44 :
  17/08/2025 00:09:44 Beginning of buffer

This happens because in this case we call 'message' 3 times, with the
following 3 strings:

  "previous-line"
  ": "
  "Beginning of buffer"

If this is acceptable, we can implement the feature you are asking
for.  Otherwise, I don't see how this could be implemented, except by
having each Lisp program that calls 'message' inject the time string
where appropriate.

What do people think about the acceptability of the above?
Do people have other ideas for implementing this?

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Date: Sun, 17 Aug 2025 09:53:26 +0300
Message-Id: <86tt26igm1.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: "R. Diez" <rdiez-2006@HIDDEN>
In-Reply-To: <fc2a1405-71c7-4ef2-8c66-ffac7d00bc96@HIDDEN>
 (rdiez-2006@HIDDEN)
Subject: Re: bug#79253: Add timestamps to *Messages*
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severity 79253 wishlist
thanks

> Date: Sat, 16 Aug 2025 23:01:50 +0200
> Cc: 79253 <at> debbugs.gnu.org
> From: "R. Diez" <rdiez-2006@HIDDEN>
> 
> 
> >> Could you implement an easy way to add timestamps to the *Messages* buffer?
> > 
> > Did you try using set-message-function to install your function as the
> > one that adds a time stamp to the text of the message to be shown?  If
> > you tried, and it didn't work, please tell what didn't work.  If you
> > didn't try, please do.
> 
> First of all, thanks for the hint. The 'message' function does not mention 'set-message-function' or the like, so I missed it.
> 
> I could find very little information about 'set-message-function', and no examples whatsoever, so I came up with this:
> 
> (defun my-message-function (msg)
>    "" ; No docstring yet.
>    (concat "Test: " msg))
> 
> (setq set-message-function #'my-message-function)
> 
> The effect is that messages in the minibuffer do get the "Test:" prefix, but messages in the *Messages* buffer do not.
> 
> But that is exactly the opposite of what I am trying to achieve!

OK, thanks for testing.

One problem with your request is that Emacs many times generates
messages by multiple calls to the 'message' function.  Prepending the
current time to each message passed to 'message' will thus produce
somewhat sub-optimal, maybe even ugly, results.  For example, if you
type C-p at the first line of a buffer, Emacs signals an error that
logs in the *Messages* buffer as

  previous-line: Beginning of buffer

But if we prepend each logged message with current time, it will
instead look like this:

  17/08/2025 00:09:44 previous-line
  17/08/2025 00:09:44 :
  17/08/2025 00:09:44 Beginning of buffer

This happens because in this case we call 'message' 3 times, with the
following 3 strings:

  "previous-line"
  ": "
  "Beginning of buffer"

If this is acceptable, we can implement the feature you are asking
for.  Otherwise, I don't see how this could be implemented, except by
having each Lisp program that calls 'message' inject the time string
where appropriate.

What do people think about the acceptability of the above?
Do people have other ideas for implementing this?

X-Loop: help-debbugs@HIDDEN
Subject: bug#79253: Add timestamps to *Messages*
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Date: Sun, 17 Aug 2025 10:11:57 +0300
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severity 79253 wishlist
thanks

> Date: Sat, 16 Aug 2025 23:01:50 +0200
> Cc: 79253 <at> debbugs.gnu.org
> From: "R. Diez" <rdiez-2006@HIDDEN>
> 
> 
> >> Could you implement an easy way to add timestamps to the *Messages* buffer?
> > 
> > Did you try using set-message-function to install your function as the
> > one that adds a time stamp to the text of the message to be shown?  If
> > you tried, and it didn't work, please tell what didn't work.  If you
> > didn't try, please do.
> 
> First of all, thanks for the hint. The 'message' function does not mention 'set-message-function' or the like, so I missed it.
> 
> I could find very little information about 'set-message-function', and no examples whatsoever, so I came up with this:
> 
> (defun my-message-function (msg)
>    "" ; No docstring yet.
>    (concat "Test: " msg))
> 
> (setq set-message-function #'my-message-function)
> 
> The effect is that messages in the minibuffer do get the "Test:" prefix, but messages in the *Messages* buffer do not.
> 
> But that is exactly the opposite of what I am trying to achieve!

OK, thanks for testing.

One problem with your request is that Emacs many times generates
messages by multiple calls to the 'message' function.  Prepending the
current time to each message passed to 'message' will thus produce
somewhat sub-optimal, maybe even ugly, results.  For example, if you
type C-p at the first line of a buffer, Emacs signals an error that
logs in the *Messages* buffer as

  previous-line: Beginning of buffer

But if we prepend each logged message with current time, it will
instead look like this:

  17/08/2025 00:09:44 previous-line
  17/08/2025 00:09:44 :
  17/08/2025 00:09:44 Beginning of buffer

This happens because in this case we call 'message' 3 times, with the
following 3 strings:

  "previous-line"
  ": "
  "Beginning of buffer"

It also means that the usual Emacs feature of compacting *Messages* by
combining duplicate messages will not work, because each of those
duplicate lines will now have different time stamps prepended to it,
and also potentially broken into several lines.

If this is acceptable, we can implement the feature you are asking
for.  Otherwise, I don't see how this could be implemented, except by
having each Lisp program that calls 'message' inject the time string
where appropriate.

What do people think about the acceptability of the above?
Do people have other ideas for implementing this?