Re: How to delay loading of packages (when eval-after-load does notapply)?

[Raffaele Ricciardi <rfflrccrd@gmail.com>]

On 08/17/2012 11:07 AM, Sebastien Vauban wrote:
 > Hi Drew,
 >
 > "Drew Adams" wrote:
 >>> How could I say: load fuzzy when I will make a search for the
 >>> first time?
 >>
 >> Try `isearch-mode-hook' with `require'.
 >
 > Did you mean this?
 >
 > --8<---------------cut here---------------start------------->8---
 >    ;; fuzzy matching utilities (a must-have)
 >    (add-hook 'isearch-mode-hook
 >              #'(lambda ()
 >                  (require 'fuzzy)))
 >
 >    (eval-after-load "fuzzy"
 >      (turn-on-fuzzy-isearch))
 > --8<---------------cut here---------------end--------------->8---
 >
 > I did the above, restarted Emacs and got:
 >
 >    Symbol's function definition is void: turn-on-fuzzy-isearch
 >
 > I don't understand why my `eval-after-load' is executed directly...
 >
 > Am I missing something?

You have to quote the form you are passing to `eval-after-load', like this:

(eval-after-load "fuzzy"
   '(turn-on-fuzzy-isearch))

Otherwise, yes, the form is evaluated on the spot.  This one bit me a 
couple of
times as well ;-)

Also, "fuzzy" means eval the following form after the library "fuzzy" 
has been
loaded, whilst 'fuzzy means eval the following code after the feature 
'fuzzy has
been provided.  I always go for the latter first, because then I'm able to
rename a library according to its version.  I would only backpedal if the
library provided its feature on top of the file as some third-party 
libraries do
- AFAIK this was a workaround for older Emacsen - and I couldn't fix 
that, but
the latter has never happened.

 >
 > Best regards,
 >    Seb
 >
 > PS- BTW, is there a better choice to be made between
 >
 > --8<---------------cut here---------------start------------->8---
 >    (add-hook 'isearch-mode-hook
 >              #'(lambda () ...
 > --8<---------------cut here---------------end--------------->8---
 >
 > and
 >
 > --8<---------------cut here---------------start------------->8---
 >    (add-hook 'isearch-mode-hook
 >              (lambda () ...
 > --8<---------------cut here---------------end--------------->8---
 >
 > ?
 >

AFAIK, they mean the same thing.  I always use the latter, for I think 
`lambda'
is verbose enough already ;-)