Re: code listp to determine wich os I'm running on

[Renato <renato.pontefice@gmail.com>]

Sorry Emanuel...
what's wrong?

(if (string= system-type "gnu/linux")
     (setq percorso-variable "\home\renato\Dropbox\emacs_prof\")
   (message "fatto"))
   (if (string= system-type "windows-nt")
       (setq percorso "c:/doc/Dropbox") ))

It does,t works... :-(

Renato


On 29/01/2014 21:28, Emanuel Berg wrote:
> Renato <renato.pontefice@gmail.com> writes:
>
>> Hi, I'm looking for some code to insert in my .emacs
>> to determine wich s.o I'm running. ...
> Instead of `string-equal', there is string= which is an
> alias for `string-equal'. Might be faster to type and
> takes less place.
>
> You don't need to use progn for a single form. Use
> progn when you want to execute a bunch of forms, and
> then have the *last* form's value to be the evaluation
> of the whole progn form. This is what the "n" is -
> execute n programs, and return the value of the last
> (the "nth"). Compare: prog1
>
> (progn 1 2 3) ; 3
> (prog1 1 2 3) ; 1
>
> The if in Lisp looks like this:
>
> (if condition then else)
>
> E.g., (if (> x y) x y) => x, if x is bigger than y,
> else y. (You may omit the "else" part if it is `nil',
> since then the whole if form will evaluate to nil
> anyway, if not the condition is true.)
>
> But you already used `cond'. `cond' and if are the
> same: cond is nested ifs, if you like. To you, as a
> programmer, it doesn't matter if cond is syntactic
> sugar for `if', or if it is the other way around. This
> only matters to the guy not programming Lisp programs,
> but the Lisp system itself.
>
> (if (string= system-type "gnu/linux")
>      (setq some-variable "...")
>    (if (string= system-type "...")
>        (setq some-variable "...") ))
>
> Or with `cond':
>
> (setq some-variable
>        (cond ((string= system-type "gnu/linux") 'value-1)
>              ((string= system-type "...")       'value-2) ))
>
> And so on. (You can do this in any way you like.)
>
> You don't need to do the F1 maneuver to check
> results. Just place point (the cursor) to the right of
> the right-most paren, then hit `C-x C-e' (for
> `eval-last-sexp'). This also works for symbols
> (variables).
>
> With the load-path though - do you really need to set
> it?
>