Re: Torturedly threaded .emacs portability. [Was: jump between if-fi]

From: Mike Mattie <codermattie@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Torturedly threaded .emacs portability.  [Was: jump between if-fi]
Date: Tue, 1 Jan 2008 21:00:00 -0800	[thread overview]
Message-ID: <20080101210000.729c2737@reforged> (raw)
In-Reply-To: <20080101155304.GB3830@muc.de>

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On Tue, 1 Jan 2008 15:53:04 +0000
Alan Mackenzie <acm@muc.de> wrote:

> Hi, Reader!
> 
> On Mon, Dec 31, 2007 at 08:29:28PM -0600, reader@newsguy.com wrote:
> 
> [ .... ]
> 
> > On a slightly different subject... if I may torture the threading
> > rules a little:
> >   Speaking of portability... I'd like to get my emacs init files to
> > be more portable from one machine to the next but one I'm dealing
> > with now has different keyboard responses than most of the others
> > and requires differnt keybindings for delete-backward-char and a few
> >   other things.
> 
> Have a look at the "Key Bindings" in the Emacs FAQ.
> 
> There are several variables you can test to find out what system
> you're running under: system-type, system-name, ....   Have a look at
> page "System Interface" in the Elisp manual.
> 
> >   I'd like to include those in .emacs but don't know how to separate
> >   them off by making them depend on which host emacs is running on.
> 
> >   Can you give me a push in that direction?
> 
> (if (eq system-type 'gnu/linux)
>     (progn
>       ....)
>   (...)
>   ....)

(cond
  ;; linux
  ((string-equal "gnu/linux" system-type)
    (load-file "/usr/share/emacs/site-lisp/site-gentoo.el"))

  ;; darwin
  ((string-equal "darwin" system-type)
    (load-file (concat my-emacs-dir "darwin.el")))
  )

the cond form is a bit easier to extend as the platform list grows.

> (if (eq window-system 'x) .....) ; See elisp manual page "Window
> Systems"
> 
> >   How to access the env variable HOSTNAME or slurp the results of
> > the hostname shell command and make the keybindings dependant on the
> >   results. 
> 
> (getenv "HOSTNAME") ; See elisp manual page "System Environment"
> 
> >   I've seen examples of something similar where the code tests if
> > its fsf emacs or Xemacs as a condition.
> 
> I think you mean "GNU Emacs".  ;-)  ["fsf emacs" is regarded as rude
> by the Emacs project, for reasons I don't fully understand.]
> 
> (if (featurep 'xemacs) ....)
> 

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