advice on a variable

advice on a variable

[Ittay Freiman]

hi,

i'm writing a minor mode which binds some keys in a minor mode map. i
would like it to be turned on/off globally, but i also want it to be
disabled for some buffer types / major modes.

the best 'trick' would be, i think, to be able to advice the mode
variable (a.k.a ittay-mode) so that when its value is gotten it will
actually run a function that, based on the current buffer and the
global value will return t/nil. then i put the mode variable and the
map in minor-mode-map-alist.

how can this be done? (i've tried using defcustom with :get, but
simply evaluating the variable's value doesn't go through it). I don't
want to make it local and set its values based in hooks.

thanx,
ittay

Re: advice on a variable

[Kai Großjohann]

ittay@qlusters.com (Ittay Freiman) writes:

> how can this be done? (i've tried using defcustom with :get, but
> simply evaluating the variable's value doesn't go through it). I don't
> want to make it local and set its values based in hooks.

But doing it via hooks seems the cleanest way to do it.  If your minor
mode can be turned off as well as on, then you can just add
turn-off-ittay-mode to the mode hooks where you want it off...

-- 
~/.signature is: umop ap!sdn    (Frank Nobis)

Re: advice on a variable

[Kevin Rodgers]

Ittay Freiman wrote:

> i'm writing a minor mode which binds some keys in a minor mode map. i
> would like it to be turned on/off globally, but i also want it to be
> disabled for some buffer types / major modes.


Then it is by defnition buffer local.


> the best 'trick' would be, i think, to be able to advice the mode
> variable (a.k.a ittay-mode) so that when its value is gotten it will
> actually run a function that, based on the current buffer and the
> global value will return t/nil. then i put the mode variable and the
> map in minor-mode-map-alist.


That would be a trick.  But only functions can be advised, and there is no
universal function through which all Lisp variable values are accessed.


> how can this be done? (i've tried using defcustom with :get, but
> simply evaluating the variable's value doesn't go through it). I don't
> want to make it local and set its values based in hooks.


You don't have a choice.

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>