* Some feature requests.
@ 2007-03-31 14:04 Dmitry Galinsky
0 siblings, 0 replies; only message in thread
From: Dmitry Galinsky @ 2007-03-31 14:04 UTC (permalink / raw)
To: emacs-devel
Hello,
I am developer of the emacs-rails, had arose some feature requests at
time of work.
== New event based management of key binding and hooks (like a
modern web-browser).
Will have replaced functions `define-key', `add-hook' to new equivalent:
---- code ---
(bind-event type value &optional basket position position-value
"Create a new event with
TYPE must be :key or :hook
VALUE
BASKET must be :pre, :default, :post
POSITION must be :bottom, :top, :after, :before")
(stop-event event
"Stop the EVENT processing")
---- code ---
and will have made the `event-struct'
---- code ---
(defstruct event-struct
type ; :key or :hook
value ; key code or hook
pre-basket ;
default-basket ;
post-basket ;)
---- code ---
Example, I had this ugly code:
---- code ---
(defun indent-or-complete ()
"Complete if point is at end of left a leave word, otherwise indent
line."
(interactive)
(cond
;; if inside snippet, do stuff
....
;; if available completion-ui, do stuff
....
;; if before point a word do hippie-expand
....
;; otherwise run default indent command
(t (indent-for-tab-command))))
(define-key "\t" 'indent-or-complete)
--- code ---
I could write it on another:
--- code ---
;; in any major mode
(bind-event :key "\t" 'indent)
;; in my setup file
(defun complete-snippet (event)
(when inside-a-snippet
...
(stop-event event))) ; stop the event processing
...
(bind-event :key "\t" 'complete-snippet :pre :bottom)
(bind-event :key "\t" 'complete-ui :pre :after 'complete-snippet)
(bind-event :key "\t" 'complete-abbrev :pre :after 'complete-ui)
--- code ---
Example of new event processing:
1. Run all functions in a 'pre-basket' list.
2. Run all functions in a 'default-basket' list.
3. Run all functions in a 'post-basket' list.
If called `stop-event' inside any event function, stop the processing of
this event, and can't run remaining functions.
The all special modes and user hacks put keys and hooks in :pre and
:post basket, all other put in :default basket.
== The new way solved some problems:
* Key redefinition and conflicts between major and minor modes.
* Stevey Yegge wrote "Some modes insist on re-binding Alt-r and Alt-s,
which is annoying, and I have a bunch of per-mode hacks to re-bind them,
but I don't have all modes covered."
To fix it (bind-event "M-r" :pre :bottom)
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