On Thu, 2006-11-30 at 20:50 +0100, Marco Gerards wrote:
> Actually, what I would prefer is something hooks. It would be nice if
> the C code in GRUB and perhaps also scripts can be hooked anywhere.
> We have to be very careful about this, so perhaps limit the sets of
> commands that can be used this way. But I think it will make GRUB
> more flexible while it is not too much effort.
I like this idea.
> I am thinking of the following functions:
>
> One to install a hook:
> grub_err_t grub_hook_register (const char *name, (*hook) (...));
>
> To trigger the hook (for example, when the user types something,
> selects another menu entry, etc.
> void grub_hook_call (const char *name, ...);
>
> How to pass arguments to functions and to scripts is something that we
> have to think about. For example, scripting functions have to get
> strings, while in other cases we just want to deal with regular
> function calls. Perhaps a printf-like mechanism can help us with
> this.
I do not think it's important that we be able to hook C functions
directly. In other words, the argument passed to --function (below)
should be a script command (or script function), and not a C function
name.
> In that case your problem can be solved by using:
>
> function handlemenu {
> beep depending on menuentry selected, the index is passed to this function
> }
>
> hook --install --hook=select-menu-entry --function=handlemenu
Defining the set of useful hooks, the arguments passed to each, and
documenting them will be critical. Also, just like with commands, once
we implement a hook we can't remove or change it without breaking config
files.
-Hollis
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