Define interactive function with arguments

Define interactive function with arguments

[Christopher Dimech]

I want to call a function that takes a numeric argument
to I can shift paragraphs.

( defun Transpose-Paragraphs-Arg (arg)
    "Transfer paragraph backward"
    (interactive)
    (transpose-paragraphs arg)
)

I have been using "M-x Transpose-Paragraphs-Arg"

But then, how does one pass the value of the argument
to the function.

Regards
Christopher

Re: Define interactive function with arguments

[Stefan Monnier]

> (defun Transpose-Paragraphs-Arg (arg)
>     "Transfer paragraph backward"
>     (interactive)
>     (transpose-paragraphs arg))
>
> I have been using "M-x Transpose-Paragraphs-Arg"

I doubt you have with the code above, because it will signal an error.
You need to provide something to `interactive` in order to build the
`arg` argument.


        Stefan

Re: Define interactive function with arguments

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

Christopher Dimech wrote:

> I want to call a function that takes a numeric
> argument to I can shift paragraphs.
>
> ( defun Transpose-Paragraphs-Arg (arg)
>     "Transfer paragraph backward"
>     (interactive)
>     (transpose-paragraphs arg)
> )
>
> I have been using "M-x Transpose-Paragraphs-Arg"
>
> But then, how does one pass the value of the
> argument to the function.

C-u X M-x transpose-paragraphs RET

where X marks the spot!

Use without an explicit number also works,

  just C-u - 4
  then C-u C-u - 16
  and so on

Also negative values are possible, e.g.

  C-u -1 M-x transpose-paragraphs RET

Also works with shortcuts.

See

  C-h f universal-argument RET

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Define interactive function with arguments

[Christopher Dimech]

Is the following code the way to write user defined functions
with arguments?

( defun Transpose-Paragraphs-Arg (arg)
    "Transfer paragraph backward"
    (interactive)
    (transpose-paragraphs arg)
)

Regards
C*


> Sent: Friday, October 09, 2020 at 1:47 AM
> From: "Emanuel Berg via Users list for the GNU Emacs text editor" <help-gnu-emacs@gnu.org>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Define interactive function with arguments
>
> Christopher Dimech wrote:
>
> > I want to call a function that takes a numeric
> > argument to I can shift paragraphs.
> >
> > ( defun Transpose-Paragraphs-Arg (arg)
> >     "Transfer paragraph backward"
> >     (interactive)
> >     (transpose-paragraphs arg)
> > )
> >
> > I have been using "M-x Transpose-Paragraphs-Arg"
> >
> > But then, how does one pass the value of the
> > argument to the function.
>
> C-u X M-x transpose-paragraphs RET
>
> where X marks the spot!
>
> Use without an explicit number also works,
>
>   just C-u - 4
>   then C-u C-u - 16
>   and so on
>
> Also negative values are possible, e.g.
>
>   C-u -1 M-x transpose-paragraphs RET
>
> Also works with shortcuts.
>
> See
>
>   C-h f universal-argument RET
>
> --
> underground experts united
> http://user.it.uu.se/~embe8573
> https://dataswamp.org/~incal
>
>
>

Re: Define interactive function with arguments

[Joost Kremers]

On Fri, Oct 09 2020, Christopher Dimech wrote:
> Is the following code the way to write user defined functions
> with arguments?
>
> ( defun Transpose-Paragraphs-Arg (arg)
>     "Transfer paragraph backward"
>     (interactive)
>     (transpose-paragraphs arg)
> )

With all due respect, you should really read the Emacs Lisp Intro, it answers
this and all (or at least most) other questions you've posted.

In Emacs, press `C-h i m Emacs Lisp Intro RET` and start reading. Or, if you
prefer online:

https://www.gnu.org/software/emacs/manual/html_node/eintr/index.html

Once you've mastered the introduction, you'll find more info in the Elisp
manual:

C-h i m Elisp RET

or

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

HTH

-- 
Joost Kremers
Life has its moments

Re: Define interactive function with arguments

[Christopher Dimech]

Your comment simply means, look at the manual and look at the code
and don't bother me.  Nobody forced you to reply, and if people do
not want to advise, they can simply disregard me.  Have heard such
talk all the time, especially in industry.

Regards
Christopher

--------------------
Christopher Dimech
General Administrator - Naiad Informatics - GNU Project (Geocomputation)
- Geophysical Simulation
- Geological Subsurface Mapping
- Disaster Preparedness and Mitigation
- Natural Resource Exploration and Production
- Free Software Advocacy




> Sent: Friday, October 09, 2020 at 9:18 AM
> From: "Joost Kremers" <joostkremers@fastmail.fm>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: moasenwood@zoho.eu, help-gnu-emacs@gnu.org
> Subject: Re: Define interactive function with arguments
>
>
> On Fri, Oct 09 2020, Christopher Dimech wrote:
> > Is the following code the way to write user defined functions
> > with arguments?
> >
> > ( defun Transpose-Paragraphs-Arg (arg)
> >     "Transfer paragraph backward"
> >     (interactive)
> >     (transpose-paragraphs arg)
> > )
>
> With all due respect, you should really read the Emacs Lisp Intro, it answers
> this and all (or at least most) other questions you've posted.
>
> In Emacs, press `C-h i m Emacs Lisp Intro RET` and start reading. Or, if you
> prefer online:
>
> https://www.gnu.org/software/emacs/manual/html_node/eintr/index.html
>
> Once you've mastered the introduction, you'll find more info in the Elisp
> manual:
>
> C-h i m Elisp RET
>
> or
>
> https://www.gnu.org/software/emacs/manual/html_node/elisp/
>
> HTH
>
> --
> Joost Kremers
> Life has its moments
>

Re: Define interactive function with arguments

[Joost Kremers]

On Fri, Oct 09 2020, Christopher Dimech wrote:
> Your comment simply means, look at the manual and look at the 
> code
> and don't bother me.  Nobody forced you to reply, and if people 
> do
> not want to advise, they can simply disregard me.  Have heard 
> such
> talk all the time, especially in industry.

I'm truly sorry if it came across wrong, but I didn't mean my 
comment that way. It was meant in a "help someone help themself" 
kind of way. The Emacs Lisp Intro is a very helpful resource (I 
think) and I didn't see anyone point it out yet. (Though I may of course have 
missed it, in which case I apologise.)

In the spirit of helpfulness, these two sections of the Elisp 
Intro answer your specific question:

https://www.gnu.org/software/emacs/manual/html_node/eintr/Interactive.html#Interactive

and:

https://www.gnu.org/software/emacs/manual/html_node/eintr/Interactive-Options.html#Interactive-Options


-- 
Joost Kremers
Life has its moments

Re: Define interactive function with arguments

[Christopher Dimech]

Joost, apology accepted. It is at times beneficial to assume others
know something you don't. Reading the manuals was pointed out and have
checked them, but they are one tough cookie unless one already knows a
decent amount and has used it to do real work.  The most useful thing I
found was describe-function.

I plan to write an abbreviated manual for this stuff, as I found it very easy
to get impatient reading so much material before you can start getting things
done.  Naturally the code I am doing is going to be released, so that new users
can easily set up their new Gnu Machine with some handy keybindings that new users
can find useful, quick to understand, and by referring to the code and the abbreviated
manual, quickly learn the basics of Emacs Lisp for their own work.

Regards
Christopher



---------------------
Christopher Dimech
Chief Administrator - Naiad Informatics - GNU Project (Geocomputation)
- Geophysical Simulation
- Geological Subsurface Mapping
- Disaster Preparedness and Mitigation
- Natural Resource Exploration and Production
- Free Software Advocacy


> Sent: Friday, October 09, 2020 at 11:22 AM
> From: "Joost Kremers" <joostkremers@fastmail.fm>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: moasenwood@zoho.eu, help-gnu-emacs@gnu.org
> Subject: Re: Define interactive function with arguments
>
>
> On Fri, Oct 09 2020, Christopher Dimech wrote:
> > Your comment simply means, look at the manual and look at the
> > code
> > and don't bother me.  Nobody forced you to reply, and if people
> > do
> > not want to advise, they can simply disregard me.  Have heard
> > such
> > talk all the time, especially in industry.
>
> I'm truly sorry if it came across wrong, but I didn't mean my
> comment that way. It was meant in a "help someone help themself"
> kind of way. The Emacs Lisp Intro is a very helpful resource (I
> think) and I didn't see anyone point it out yet. (Though I may of course have
> missed it, in which case I apologise.)
>
> In the spirit of helpfulness, these two sections of the Elisp
> Intro answer your specific question:
>
> https://www.gnu.org/software/emacs/manual/html_node/eintr/Interactive.html#Interactive
>
> and:
>
> https://www.gnu.org/software/emacs/manual/html_node/eintr/Interactive-Options.html#Interactive-Options
>
>
> --
> Joost Kremers
> Life has its moments
>

Re: Define interactive function with arguments

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

Christopher Dimech wrote:

> Your comment simply means, look at the manual [...]

If you don't want to look at the manual, how about:

  1. think

  2. byte compile and read the warnings and errors

  3. do C-h f FUN RET and C-h v VAR RET for
     everything in your ... code

  4. OK?

And yes, TBH do us all a favor and drop that style :$
use proper whitespace, case, names that makes sense,
indentation, comments, and all that, before this
turns into an embarrassment to the sport :(

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Define interactive function with arguments

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

Christopher Dimech wrote:

> I plan to write an abbreviated manual for this
> stuff [...]

...

:)

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Define interactive function with arguments

[Christopher Dimech]

Have looked at what I send and have used indentation, whitespace,
etc but during the sending operation it is scrambling the whole code.
Will look into it so it will show right.

> Sent: Friday, October 09, 2020 at 4:01 PM
> From: "Emanuel Berg via Users list for the GNU Emacs text editor" <help-gnu-emacs@gnu.org>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Define interactive function with arguments
>
> Christopher Dimech wrote:
>
> > Your comment simply means, look at the manual [...]
>
> If you don't want to look at the manual, how about:
>
>   1. think
>
>   2. byte compile and read the warnings and errors
>
>   3. do C-h f FUN RET and C-h v VAR RET for
>      everything in your ... code
>
>   4. OK?
>
> And yes, TBH do us all a favor and drop that style :$
> use proper whitespace, case, names that makes sense,
> indentation, comments, and all that, before this
> turns into an embarrassment to the sport :(
>
> --
> underground experts united
> http://user.it.uu.se/~embe8573
> https://dataswamp.org/~incal
>
>
>