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Re: how to load code conditional on uid
From: |
Harry Putnam |
Subject: |
Re: how to load code conditional on uid |
Date: |
Sat, 12 Nov 2011 05:19:52 -0600 |
User-agent: |
Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.90 (gnu/linux) |
"Drew Adams" <drew.adams@oracle.com> writes:
> What do you want to test? Whether the current `user-uid' is a
> member of that list? If so, use function `member' - do not use
> function `=' which tests whether two numbers are equal.
C-h f member <RET> shows something that for a lightweight like me is
your basic greek.
,----
| member is a built-in function in `C source code'.
|
| (member ELT LIST)
|
| Return non-nil if ELT is an element of LIST. Comparison done with `equal'.
| The value is actually the tail of LIST whose car is ELT.
`----
Doing an index search in `emacs-lisp-intro' on `member' shows no hits so
apparently it is not used or explained in that document.
Not sure how I would find out what ELT means. A quick index search in
Elisp manaual on ELT shows:
,----
| -- Function: elt sequence index
| This function returns the element of SEQUENCE indexed by INDEX.
| Legitimate values of INDEX are integers ranging from 0 up to one
| less than the length of SEQUENCE. If SEQUENCE is a list,
| out-of-range values behave as for `nth'. *Note Definition of
| nth::. Otherwise, out-of-range values trigger an
| `args-out-of-range' error.
| [...]
`----
Well, that didn't help (me) much. Other than to indicate ELT is short
for element.
But at a glance it sounds as if it could be a uid like 1000 or maybe
(user-uid).
So a couple of clumsy experiments show I've got it all wrong.
(when (member 1000 (1000 1001 1002))
(add-to-list 'load-path ...)
(add-to-list 'load-path ...))
or maybe
(when (member (user-uid) (1000 1001 1002))
(add-to-list 'load-path ...)
(add-to-list 'load-path ...))