* require a package only if present
@ 2009-07-11 17:44 Andrei Alexandrescu
2009-07-11 18:46 ` Edward O'Connor
[not found] ` <mailman.2314.1247338027.2239.help-gnu-emacs@gnu.org>
0 siblings, 2 replies; 5+ messages in thread
From: Andrei Alexandrescu @ 2009-07-11 17:44 UTC (permalink / raw)
To: help-gnu-emacs
I am trying to use the same copy of .emacs across various machines.
Some, however, don't have certain packages. So I need to replace lines like:
(require 'tex-site)
with code that checks whether tex-site is present and only loads it if
there. How can I do that? Any pointers welcome.
Thanks,
Andrei
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: require a package only if present
2009-07-11 17:44 require a package only if present Andrei Alexandrescu
@ 2009-07-11 18:46 ` Edward O'Connor
[not found] ` <mailman.2314.1247338027.2239.help-gnu-emacs@gnu.org>
1 sibling, 0 replies; 5+ messages in thread
From: Edward O'Connor @ 2009-07-11 18:46 UTC (permalink / raw)
To: Andrei Alexandrescu; +Cc: help-gnu-emacs@gnu.org
> I am trying to use the same copy of .emacs across various machines.
> Some, however, don't have certain packages. So I need to replace
> lines like:
>
> (require 'tex-site)
>
> with code that checks whether tex-site is present and only loads it
> if there. How can I do that? Any pointers welcome.
(require 'tex-site nil t)
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: require a package only if present
[not found] ` <mailman.2314.1247338027.2239.help-gnu-emacs@gnu.org>
@ 2009-07-11 21:14 ` Andrei Alexandrescu
2009-07-11 21:42 ` Will Parsons
1 sibling, 0 replies; 5+ messages in thread
From: Andrei Alexandrescu @ 2009-07-11 21:14 UTC (permalink / raw)
To: help-gnu-emacs
Edward O'Connor wrote:
>
>> I am trying to use the same copy of .emacs across various machines.
>> Some, however, don't have certain packages. So I need to replace lines
>> like:
>>
>> (require 'tex-site)
>>
>> with code that checks whether tex-site is present and only loads it if
>> there. How can I do that? Any pointers welcome.
>
> (require 'tex-site nil t)
Many thanks!
Andrei
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: require a package only if present
[not found] ` <mailman.2314.1247338027.2239.help-gnu-emacs@gnu.org>
2009-07-11 21:14 ` Andrei Alexandrescu
@ 2009-07-11 21:42 ` Will Parsons
2009-07-13 9:12 ` Fabrice Niessen
1 sibling, 1 reply; 5+ messages in thread
From: Will Parsons @ 2009-07-11 21:42 UTC (permalink / raw)
To: help-gnu-emacs
Edward O'Connor wrote:
>
>> I am trying to use the same copy of .emacs across various machines.
>> Some, however, don't have certain packages. So I need to replace
>> lines like:
>>
>> (require 'tex-site)
>>
>> with code that checks whether tex-site is present and only loads it
>> if there. How can I do that? Any pointers welcome.
>
> (require 'tex-site nil t)
I don't believe that works for XEmacs (which may be irrelevant for the OP),
so I use instead:
(when (locate-library "lib-name")
(require 'lib-name))
--
Will
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: require a package only if present
2009-07-11 21:42 ` Will Parsons
@ 2009-07-13 9:12 ` Fabrice Niessen
0 siblings, 0 replies; 5+ messages in thread
From: Fabrice Niessen @ 2009-07-13 9:12 UTC (permalink / raw)
To: help-gnu-emacs-mXXj517/zsQ
Hello,
Will Parsons wrote:
> Edward O'Connor wrote:
>>> I am trying to use the same copy of .emacs across various machines. Some,
>>> however, don't have certain packages. So I need to replace lines like:
>>>
>>> (require 'tex-site)
>>>
>>> with code that checks whether tex-site is present and only loads it if
>>> there. How can I do that? Any pointers welcome.
>>
>> (require 'tex-site nil t)
>
> I don't believe that works for XEmacs (which may be irrelevant for the OP),
> so I use instead:
>
> (when (locate-library "lib-name")
> (require 'lib-name))
I'm using the following code, both compatible with GNU Emacs and XEmacs:
--8<---------------cut here---------------start------------->8---
(defvar missing-packages-list nil
"List of packages that `try-require' can't find.")
;; attempt to load a feature/library, failing silently
(defun try-require (feature)
"Attempt to load a library or module. Return true if the
library given as argument is successfully loaded. If not, instead
of an error, just add the package to a list of missing packages."
(condition-case err
;; protected form
(progn
(message "Checking for library `%s'..." feature)
(if (stringp feature)
(load-library feature)
(require feature))
(message "Checking for library `%s'... Found" feature))
;; error handler
(file-error ; condition
(progn
(message "Checking for library `%s'... Missing" feature)
(add-to-list 'missing-packages-list feature))
nil)))
--8<---------------cut here---------------end--------------->8---
and, for every package I wanna load if present:
--8<---------------cut here---------------start------------->8---
(try-require 'tex-site)
--8<---------------cut here---------------end--------------->8---
(for example).
See http://www.mygooglest.com/fni/dot-emacs.html for more examples.
Fabrice
_________________________________________________________________________
Fabrice Niessen
Search the Web with "My Google Search Tools" on http://www.MyGooglest.com
^ permalink raw reply [flat|nested] 5+ messages in thread
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2009-07-11 17:44 require a package only if present Andrei Alexandrescu
2009-07-11 18:46 ` Edward O'Connor
[not found] ` <mailman.2314.1247338027.2239.help-gnu-emacs@gnu.org>
2009-07-11 21:14 ` Andrei Alexandrescu
2009-07-11 21:42 ` Will Parsons
2009-07-13 9:12 ` Fabrice Niessen
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