insert string at point with emacs-version

insert string at point with emacs-version

[goncholden]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Tuesday, February 1st, 2022 at 6:26 PM, Drew Adams <drew.adams@oracle.com> wrote:

> Ask Emacs:
>
> `C-h f if'` C-h f cond'
>
> `C-h i', choose Elisp manual,` g Conditionals'
>
> > My difficulty is about calling
> >
> > (alist-get (frame--current-backround-mode nil) colors)
> >
> > when (> emacs-version 28.0)
> >
> > and do some other thing otherwise.


Would the use of cond in the case below make sense?

  (let* ( (colors annotation-chroma)
          (levels
	   (cond (>= emacs-version 28.0)
		 (alist-get (frame--current-backround-mode nil) colors)) ))

RE: [External] : insert string at point with emacs-version

[Drew Adams]

> > `C-h f if'` C-h f cond'
> > `C-h i', choose Elisp manual,` g Conditionals'
> 
> Would the use of cond in the case below make sense?
> 
>   (let* ( (colors annotation-chroma)
>           (levels
> 	   (cond (>= emacs-version 28.0)
> 		 (alist-get (frame--current-backround-mode nil) colors)) ))

Pay attention to what `C-h f cond' tells you.

(cond ((>= emacs-version 28.0)
       (alist-get (frame--current-backround-mode nil) colors))

Typically you use `cond' with more than one
condition branch, and often with more than two.

The above code is the same as this:

(when (>= emacs-version 28.0)
  (alist-get (frame--current-backround-mode nil) colors))

or this:

(if (>= emacs-version 28.0)
    (alist-get (frame--current-backround-mode nil) colors))

Again, the Elisp manual, node Conditionals, tells
you these things.  Ask Emacs.

https://www.gnu.org/software/emacs/manual/html_node/elisp/Conditionals.html

Many people use `if' only with two branches, or
when the result matters.  Using `when' or `unless'
when the result isn't important makes that clear
to human readers.

When the result matters, you also have `and' and
`or', in addition to `if' and `cond'.

And know about `progn', to group multiple actions.

insert string at point with emacs-version

[goncholden]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Tuesday, February 1st, 2022 at 5:54 PM, Drew Adams <drew.adams@oracle.com> wrote:

> How can I have a condition that checks whether the version
>
> is 28.0 or later

(> emacs-major-version 27)

My difficulty is about calling

(alist-get (frame--current-backround-mode nil) colors)

when (> emacs-version 28.0)

and do some other thing otherwise.

insert string at point with emacs-version

[goncholden via Users list for the GNU Emacs text editor]

I am looking up documentation for emacs-version. But cannot understand the meaning of

If optional argument HERE is non-nil, insert string at point.

--------
Doc:

(emacs-version &optional HERE)

Probably introduced at or before Emacs version 19.20.

Return string describing the version of Emacs that is running.
If optional argument HERE is non-nil, insert string at point.

Re: insert string at point with emacs-version

[Jean-Christophe Helary]

> On Feb 1, 2022, at 23:24, goncholden via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
> 
> I am looking up documentation for emacs-version. But cannot understand the meaning of
> 
> If optional argument HERE is non-nil, insert string at point.
> 
> --------
> Doc:
> 
> (emacs-version &optional HERE)
> 
> Probably introduced at or before Emacs version 19.20.
> 
> Return string describing the version of Emacs that is running.
> If optional argument HERE is non-nil, insert string at point.

try:
(emacs-version 1)

and
(emacs-version)

and

(emacs-version nil)



-- 
Jean-Christophe Helary @brandelune
https://mac4translators.blogspot.com
https://sr.ht/~brandelune/omegat-as-a-book/

Re: insert string at point with emacs-version

[Robert Pluim]

>>>>> On Tue, 01 Feb 2022 14:24:35 +0000, goncholden via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> said:

    goncholden> I am looking up documentation for emacs-version. But cannot understand the meaning of
    goncholden> If optional argument HERE is non-nil, insert string at point.

`emacs-version' is a function that can be called with 0 or 1
argument. When calling it with 1 argument, that argument is referred
to as "HERE" in the docstring, so in

    (emacs-version t)

"HERE" equals t (and this will insert the emacs version string).

Robert
-- 

Re: insert string at point with emacs-version

[H. Dieter Wilhelm]

goncholden via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> I am looking up documentation for emacs-version. But cannot understand the meaning of
>
> If optional argument HERE is non-nil, insert string at point.
>
> --------
> Doc:
>
> (emacs-version &optional HERE)
>
> Probably introduced at or before Emacs version 19.20.
>
> Return string describing the version of Emacs that is running.
> If optional argument HERE is non-nil, insert string at point.

HERE in this context means that if the argument HERE is not nil then at
the current position of the cursor (thus "here") in the current document
(buffer) the version string will be inserted.

Please contrast

  (emacs-version)  <- "Here" ;-), behind the parenthesis please do: C-x e
  (emacs-version t) <- and here as well 

or check the interactive "version" version:

  M-x version
  C-u M-x version

HTH

    Dieter

-- 
Best wishes
H. Dieter Wilhelm
Zwingenberg, Germany

Re: insert string at point with emacs-version

[inasprecali]

goncholden via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> I am looking up documentation for emacs-version. But cannot understand the meaning of
>
> If optional argument HERE is non-nil, insert string at point.
>
> --------
> Doc:
>
> (emacs-version &optional HERE)
>
> Probably introduced at or before Emacs version 19.20.
>
> Return string describing the version of Emacs that is running.
> If optional argument HERE is non-nil, insert string at point.

In Emacs jargon, "point" means something like "the current cursor
position".  Try executing (emacs-version nil) and (emacs-version t)
in a scratch buffer and see for yourself (C-x C-e runs the
command eval-last-sexp, which you may find useful for this).

When ARG is not provided or nil, emacs-version returns a string
describing your current Emacs version as a value, if ARG is not
NIL, emacs-version returns NIL and inserts said string wherever
the cursor is currently located (that is, it inserts it at point).

insert string at point with emacs-version

[goncholden]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Tuesday, February 1st, 2022 at 4:33 PM, inasprecali <inasprecali@disroot.org> wrote:

> goncholden via Users list for the GNU Emacs text editor
>
> help-gnu-emacs@gnu.org writes:
>
> > I am looking up documentation for emacs-version. But cannot understand the meaning of
> >
> > If optional argument HERE is non-nil, insert string at point.
> >
> > Doc:
> >
> > (emacs-version &optional HERE)
> >
> > Probably introduced at or before Emacs version 19.20.
> >
> > Return string describing the version of Emacs that is running.
> >
> > If optional argument HERE is non-nil, insert string at point.
>
> In Emacs jargon, "point" means something like "the current cursor
>
> position". Try executing (emacs-version nil) and (emacs-version t)
>
> in a scratch buffer and see for yourself (C-x C-e runs the
>
> command eval-last-sexp, which you may find useful for this).
>
> When ARG is not provided or nil, emacs-version returns a string
>
> describing your current Emacs version as a value, if ARG is not
>
> NIL, emacs-version returns NIL and inserts said string wherever
>
> the cursor is currently located (that is, it inserts it at point).

I got it, it is to print a message in buffer.

Re: insert string at point with emacs-version

[tomas]

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On Tue, Feb 01, 2022 at 02:24:35PM +0000, goncholden via Users list for the GNU Emacs text editor wrote:
> I am looking up documentation for emacs-version. But cannot understand the meaning of
> 
> If optional argument HERE is non-nil, insert string at point.
> 
> --------
> Doc:
> 
> (emacs-version &optional HERE)
> 
> Probably introduced at or before Emacs version 19.20.
> 
> Return string describing the version of Emacs that is running.
> If optional argument HERE is non-nil, insert string at point.

When in a buffer (whose content is not very important to you) try:

  M-x eval-expression

Then enter

  (emacs-version 'bluntschli)

and see what happens :)

Of course, any value besides 'bluntschli will do, as long as it is not
nil.

Of course, since it doesn't make a difference, you'll use t to not
coufuse your readers.

Cheers
-- 
tomás

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Re: insert string at point with emacs-version

[Emanuel Berg via Users list for the GNU Emacs text editor]

tomas wrote:

> When in a buffer (whose content is not very important to
> you) try:
>
>   M-x eval-expression
>
> Then enter
>
>   (emacs-version 'bluntschli)
>
> Of course, any value besides 'bluntschli will do, as long as it is not
> nil.
>
> Of course, since it doesn't make a difference, you'll use
> t to not coufuse your readers.

It is used like this, C-u M-x emacs-version RET

So type for example "I like this Emacs version the most" then
hit the above combo for, in my case

  GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, cairo
  version 1.16.0) of 2021-12-31

There is the same for Gnus, `gnus-version'

  Gnus v5.13

and I did the same for w3m and Emacs-w3m

;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;;   https://dataswamp.org/~incal/emacs-init/w3m/w3m-version.el

(require 'w3m)

(defun emacs-w3m-version (&optional here)
  "Version number of this version of Emacs-w3m, `emacs-w3m-version'.
If optional argument HERE is non-nil, insert string at point.
\nThis is not the version of the shell tool w3m; see `w3m-version'."
  (interactive "P")
  (if here
      (insert (message emacs-w3m-version))
    (message emacs-w3m-version) ))

(defun w3m-version (&optional here)
  "Version number of this version of w3m, `w3m-version'.
If optional argument HERE is non-nil, insert string at point.
\nThis is not the version of the Emacs browser; see `emacs-w3m-version'."
  (interactive "P")
  (if here
      (insert (message w3m-version))
    (message w3m-version) ))

-- 
underground experts united
https://dataswamp.org/~incal