Re: System operating detection

[pjb@informatimago.com (Pascal J. Bourguignon)]

Andrea Crotti <andrea.crotti.0@gmail.com> writes:

> Thierry Volpiatto <thierry.volpiatto@gmail.com> writes:
>
>> Andrea Crotti <andrea.crotti.0@gmail.com> writes:
>>
>> Use case:
>>
>> ,----
>> | (case system-type
>> |   (gnu/linux "Linux")
>> |   (window-nt "windows")
>> |   (darwin    "mac")
>> |   (t         "other")
>> `----
>>
>>
>>
>>>
>>>
>
> Ah great I didn't know this, so now is
> --8<---------------cut here---------------start------------->8---
>   (defconst linux nil)
>   (defconst mac nil)
>   (defconst win nil)
>   (defconst other nil)
>   
>   (case system-type
>     (gnu/linux (setq linux t))
>     (window-nt (setq mac t))
>     (darwin    (setq win t))
>     (t         (setq other t)))
> --8<---------------cut here---------------end--------------->8---
>
> But maybe could be even better, what if I create the symbol only if
> really needed?
>
> Then I could do
> --8<---------------cut here---------------start------------->8---
> (if (boundp linux)...
> --8<---------------cut here---------------end--------------->8---
> which probably becomes even longer.
> Isn't there a way to automatically define functions or variables?

What if you write simply:

    (when (eq system-type 'gnu/linux) 
       ...)
?

or, if you have several cases:

   (case system-type
     ((gnu/linux)  (do-something-on-linux))
     ((mac)        (do-something-on-mac))
     (otherwise    (do-something-standard)))

?

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/