Messages - Avoiding newlines

Messages - Avoiding newlines

[pietru]

I would like to print some values but I am getting a new-line
after (pp bounds).  Haw may I avoid it?

(message "Bounds: %s [%s, %s]" (pp bounds) $ma $mb)

Result:

Bounds: (78 . 84)
 [78, 84]

Re: Messages - Avoiding newlines

[Stefan Möding]

pietru@caramail.com writes:

> I would like to print some values but I am getting a new-line
> after (pp bounds).  Haw may I avoid it?

You could remove the trailing newlines returned by pp:

(message "Bounds: %s [%s, %s]"
         (replace-regexp-in-string "\n+$" "" (pp bounds)) $ma $mb)

pp (Pretty Print) is meant to be used interactively so the newline make
sense when showing the output on a terminal.

-- 
Stefan

Re: Messages - Avoiding newlines

[2QdxY4RzWzUUiLuE]

On 2020-12-08 at 14:29:20 +0100,
Stefan Möding <s.moeding@gmail.com> wrote:

> pietru@caramail.com writes:
> 
> > I would like to print some values but I am getting a new-line
> > after (pp bounds).  Haw may I avoid it?
> 
> You could remove the trailing newlines returned by pp:
> 
> (message "Bounds: %s [%s, %s]"
>          (replace-regexp-in-string "\n+$" "" (pp bounds)) $ma $mb)

A regular expression is a heavyweight solution to this problem.  Try a
substring containing all but the trailing newline:

    (substring (pp bounds t) 0 -1)

> pp (Pretty Print) is meant to be used interactively so the newline
> make sense when showing the output on a terminal.

Note also that by passing a second argument to pp, you can suppress pp's
output and make it just return the string.

HTH,
Dan

Re: Messages - Avoiding newlines

[pietru]

> Sent: Tuesday, December 08, 2020 at 2:29 PM
> From: "Stefan Möding" <s.moeding@gmail.com>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Messages - Avoiding newlines
>
> pietru@caramail.com writes:
> 
> > I would like to print some values but I am getting a new-line
> > after (pp bounds).  Haw may I avoid it?
> 
> You could remove the trailing newlines returned by pp:
> 
> (message "Bounds: %s [%s, %s]"
>          (replace-regexp-in-string "\n+$" "" (pp bounds)) $ma $mb)
> 
> pp (Pretty Print) is meant to be used interactively so the newline make
> sense when showing the output on a terminal.

Thusly I can simply use 

(message "Bounds: %s %s %s" bounds $ma $mb)

 
> -- 
> Stefan
> 
>

Re: Messages - Avoiding newlines

[pietru]

When using 

(message "\nBounds: %s | $ma $mb [%s,%s] |"
   (replace-regexp-in-string "\n+$" "" (pp bounds)) $ma $mb)

I get

-------- result --------
(78 . 84)


Bounds: (78 . 84) | $ma $mb [78,84] |
------ result --------


> Sent: Tuesday, December 08, 2020 at 2:29 PM
> From: "Stefan Möding" <s.moeding@gmail.com>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Messages - Avoiding newlines
>
> pietru@caramail.com writes:
> 
> > I would like to print some values but I am getting a new-line
> > after (pp bounds).  Haw may I avoid it?
> 
> You could remove the trailing newlines returned by pp:
> 
> (message "Bounds: %s [%s, %s]"
>          (replace-regexp-in-string "\n+$" "" (pp bounds)) $ma $mb)
> 
> pp (Pretty Print) is meant to be used interactively so the newline make
> sense when showing the output on a terminal.
> 
> -- 
> Stefan
> 
>

Re: Messages - Avoiding newlines

[Michael Heerdegen]

pietru@caramail.com writes:

> I would like to print some values but I am getting a new-line
> after (pp bounds).  Haw may I avoid it?
>
> (message "Bounds: %s [%s, %s]" (pp bounds) $ma $mb)

`pp' prints the output by itself.  You want `pp-to-string' when you want
to use the result(s) in `message'.  But yes: for simple values using
`pp' doesn't make a difference.  All it does is more or less adding some
newlines to make large structures more readable.

Michael.

Re: Messages - Avoiding newlines

[Tim Landscheidt]

pietru@caramail.com wrote:

> I would like to print some values but I am getting a new-line
> after (pp bounds).  Haw may I avoid it?

> (message "Bounds: %s [%s, %s]" (pp bounds) $ma $mb)

> Result:

> Bounds: (78 . 84)
>  [78, 84]

Not strictly what you ask for, but for "simple" data struc-
tures, the "%S" format might fit your requirements:

| ELISP> (let*
|            ((bounds '(78 . 84))
|             ($ma (car bounds))
|             ($mb (cdr bounds)))
|          (message "Bounds: %S [%s, %s]" bounds $ma $mb))
                             ^^
| "Bounds: (78 . 84) [78, 84]"
| ELISP>

In this specific case, it is equivalent to "%s"; but this is
different when for example you are printing (structures con-
taining) strings.

Tim