From: Renato <renato.pontefice@gmail.com>
To: Emanuel Berg <embe8573@student.uu.se>
Cc: help-gnu-emacs@gnu.org
Subject: Re: code listp to determine wich os I'm running on
Date: Wed, 29 Jan 2014 23:12:58 +0100 [thread overview]
Message-ID: <52E97CEA.4060901@gmail.com> (raw)
In-Reply-To: <87mwiettum.fsf@nl106-137-194.student.uu.se>
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?
>
next prev parent reply other threads:[~2014-01-29 22:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.13113.1391020728.10748.help-gnu-emacs@gnu.org>
2014-01-29 20:28 ` code listp to determine wich os I'm running on Emanuel Berg
2014-01-29 22:12 ` Renato [this message]
2014-01-29 23:26 ` Peter Dyballa
2014-01-30 0:11 ` Stefan Monnier
[not found] ` <mailman.13124.1391033590.10748.help-gnu-emacs@gnu.org>
2014-01-29 22:27 ` Emanuel Berg
2014-01-30 2:27 ` Rusi
2014-01-30 2:47 ` Rusi
2014-01-29 21:14 ` Pascal J. Bourguignon
2014-01-29 23:52 ` Emanuel Berg
2014-01-30 2:43 ` Rusi
2014-01-30 3:47 ` Stefan Monnier
[not found] ` <mailman.13151.1391053674.10748.help-gnu-emacs@gnu.org>
2014-01-30 4:01 ` Rusi
2014-01-30 12:59 ` Rusi
[not found] <mailman.13331.1391158986.10748.help-gnu-emacs@gnu.org>
2014-01-31 11:57 ` Rusi
2014-01-31 9:03 Renato Pontefice
2014-01-31 13:28 ` Stefan Monnier
2014-01-31 23:01 ` Tassilo Horn
[not found] ` <mailman.13357.1391175021.10748.help-gnu-emacs@gnu.org>
2014-01-31 14:05 ` Rusi
2014-01-31 17:02 ` Renato
[not found] ` <mailman.13385.1391187779.10748.help-gnu-emacs@gnu.org>
2014-01-31 17:15 ` Rusi
2014-01-31 17:32 ` Rusi
-- strict thread matches above, loose matches on Subject: below --
2014-01-31 8:39 Renato Pontefice
2014-01-30 1:55 Louis-Guillaume Gagnon
2014-01-30 1:57 ` Louis-Guillaume Gagnon
2014-01-29 18:41 Renato
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