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Re: Context-aware return

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On Friday, September 11, 2015 at 12:53:28 AM UTC+5:30, Grant Edwards wrote:
> On 2015-09-10, Steven D'Aprano  wrote:
> 
> > I have a function which is intended for use at the interactive interpreter,
> > but may sometimes be used non-interactively. I wish to change it's output
> > depending on the context of how it is being called.
> 
> [...]
> 
> Sounds like an excellent way to waste somebody's afternoon when they
> start to troubleshoot code that's using your function.  Over and over
> and over we tell newbies who have questions about what something
> returns or how it works
> 
>     "Start up an interactive session, and try it!".
> 
> If word gets out about functions like yours, we sort of end up looking
> like twits.  
> 
> > If I did this thing, would people follow me down the street booing
> > and jeering and throwing things at me?
> 
> Only the people who use your function. :)


In emacs:
You can make a function a 'command' by putting an (interactive) into it.
And then in the function if you check interactive-p (nowadays more fashionably
'called-interactively-p' ) then it can figure out whether it was called from 
elisp or from emacs (top level)... and then change behavior accordingly.

IOW this behavior is quite routine in emacs-land
The norm being 
- Some functions are meant to be called only from Lisp
- Some functions (commands) only from emacs
- And then there are the 'Steven-functions'

I find it curious that the people getting upset about this are all the
emacs users [as far as I know] ;-)

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Context-aware return Steven D'Aprano <steve@pearwood.info> - 2015-09-11 03:54 +1000
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:03 +0200
  Re: Context-aware return Ben Finney <ben+python@benfinney.id.au> - 2015-09-11 04:12 +1000
  Re: Context-aware return Ben Finney <ben+python@benfinney.id.au> - 2015-09-11 04:14 +1000
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:21 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:24 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:34 +0200
  Re: Context-aware return Chris Angelico <rosuav@gmail.com> - 2015-09-11 04:39 +1000
  Re: Context-aware return Laura Creighton <lac@openend.se> - 2015-09-10 20:40 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:45 +0200
  Re: Context-aware return "Sven R. Kunze" <srkunze@mail.de> - 2015-09-10 20:56 +0200
  Re: Context-aware return Paul Rubin <no.email@nospam.invalid> - 2015-09-10 12:19 -0700
  Re: Context-aware return Grant Edwards <invalid@invalid.invalid> - 2015-09-10 19:23 +0000
    Re: Context-aware return Akira Li <4kir4.1i@gmail.com> - 2015-09-10 23:15 +0300
      Re: Context-aware return Grant Edwards <invalid@invalid.invalid> - 2015-09-10 20:27 +0000
    Re: Context-aware return random832@fastmail.us - 2015-09-10 16:42 -0400
    Re: Context-aware return Rustom Mody <rustompmody@gmail.com> - 2015-09-11 08:55 -0700
    Re: Context-aware return Rustom Mody <rustompmody@gmail.com> - 2015-09-11 08:55 -0700
  Re: Context-aware return Denis McMahon <denismfmcmahon@gmail.com> - 2015-09-11 00:41 +0000
    Re: Context-aware return Ned Batchelder <ned@nedbatchelder.com> - 2015-09-12 16:27 -0700
      Re: Context-aware return Steven D'Aprano <steve@pearwood.info> - 2015-09-17 12:31 +1000
  Re: Context-aware return Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-12 03:11 +0100

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