/[emacs]/emacs/man/custom.texi
ViewVC logotype

Diff of /emacs/man/custom.texi

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.85 by lute, Wed May 18 14:22:39 2005 UTC revision 1.86 by rms, Sun Jul 17 19:47:56 2005 UTC
# Line 2313  Enable the use of the command @code{narr Line 2313  Enable the use of the command @code{narr
2313  @end example  @end example
2314    
2315  @item  @item
2316  Adjusting the configuration to various contexts.  Adjusting the configuration to various platforms and Emacs versions.
2317    
2318  In most of the cases, people want their Emacs to behave the same on  Users typically want Emacs to behave the same on all systems, so the
2319  all their machines, so their configuration should be the same, no  same init file is right for all platforms.  However, sometimes it
2320  matter whether it's GNU/Linux or not, under X11 or on a tty, with one  happens that a function you use for customizing Emacs is not available
2321  version of  Emacs or another, ...  on some platforms or in older Emacs versions.  To deal with that
2322    situation, put the customization inside a conditional that tests whether
2323  What can happen, tho, is that depending on the circumstance some  the function or facility is available, like this:
 features may or may not be available.  In that case just prepend each  
 such customization with a little test that ensures that the feature  
 can be used.  The best tests are usually checking that the feature is  
 available, rather than checking what kind of environment is  
 being used.  
2324    
2325  @example  @example
2326  (if (fboundp 'blinking-cursor-mode)  (if (fboundp 'blink-cursor-mode)
2327      (blinking-cursor-mode 0))      (blink-cursor-mode 0))
 @end example  
2328    
 @example  
2329  (if (boundp 'coding-category-utf-8)  (if (boundp 'coding-category-utf-8)
2330    (set-coding-priority '(coding-category-utf-8)))      (set-coding-priority '(coding-category-utf-8)))
2331  @end example  @end example
2332    
2333    @noindent
2334    You can also simply disregard the errors that occur if the
2335    function is not defined.
2336    
2337  @example  @example
2338  (require 'cl)                   ; To define `ignore-errors'.  (condition case ()
2339  (ignore-errors (set-face-background 'region "grey75"))      (set-face-background 'region "grey75")
2340      (error nil))
2341  @end example  @end example
2342    
2343  Note also that a @code{setq} on a variable which does not exist is  A @code{setq} on a variable which does not exist is generally
2344  generally harmless, so those usually do not need to be made  harmless, so those do not need a conditional.
 conditional on any kind of test.  
   
2345  @end itemize  @end itemize
2346    
   
2347  @node Terminal Init  @node Terminal Init
2348  @subsection Terminal-specific Initialization  @subsection Terminal-specific Initialization
2349    

Legend:
Removed from v.1.85  
changed lines
  Added in v.1.86

savannah-hackers-public@gnu.org
ViewVC Help
Powered by ViewVC 1.1.26