[racket] Alt/Option key as meta on Mac

On Fri, Nov 29, 2013 at 3:10 PM, <jab at math.brown.edu> wrote:

> On Thu, Nov 28, 2013 at 10:33 PM, Robby Findler <
> robby at eecs.northwestern.edu> wrote:
>
>> Oh, I should have done that long ago. I've pushed something that lets you
>> use alt as meta.
>>
>
> Just found it at https://github.com/plt/racket/commit/d95a6b02. Thank you
> for adding this! And so quickly, to boot!
>
> Can't wait to be able to use it. Extrapolating based on the release dates
> of the last few versions, the next release should be out soon, I take it?
> Is there a way to get Alt as Meta working in the meantime?
>
>
You can build racket (it isn't too hard once you have the dev stuff
installed), or you can get the latest snapshot which, I believe, has that
commit: http://plt.eecs.northwestern.edu/snapshots/


> I've already figured out how to add a user-defined keybindings file to map
> Ctrl+w to "backward-kill-word", as in the shell. In case it helps anyone
> else:
>
>  #lang s-exp framework/keybinding-lang
>
>
> (define (rebind key command)
>
>   (keybinding
>
>    key
>
>    (λ (ed evt)
>
>      (send (send ed get-keymap) call-function command ed evt #t))))
>
>
> (rebind "control:w" "backward-kill-word")
>
>
>
> Similarly I'd like to map Ctrl-u to "delete-to-beginning-of-line", but it
> looks like that function doesn't come out of the box, and I haven't yet
> tried to figure out how to add it.
>
>
You want look at the methods of text% (of which ed is one), specifically
for the position-paragraph and related methods.


> One last behavior I miss from the shell (as well as other GUI IDEs with
> REPLs, such as Python's IDLE) is the default mapping of Ctrl-p/Ctrl-n to
> "previous/next command from history" rather than "move the cursor up/down",
> which I need much less often. Tried to figure out how to change this, but
> didn't see where the Meta-p/Meta-n mappings were defined
> in collects/framework/private/keymap.rkt in the first place.
>
>
The names of various existing key bindings are listed in the
Edit|Keybindings|Show Active Keybindings... menu item.


>  Any advice on these would be much appreciated. And I'll start a new
> thread if this is getting too off-topic for this one.
>
>
>> The docs are wrong, tho, because even with the release version you should
>> be able to use command as meta (not that you really want to...)
>>
>
> (I didn't see a Command as Meta option in preferences, but you're right
> that I don't want that anyway.)
>
>
Which OS are you using?


> Thanks again for your help, Robby, and happy Thanksgiving weekend to
> everyone celebrating.
>
>
Happy Thanksgiving to you too.

Robby


> Robby
>>
>>
>> On Wed, Nov 27, 2013 at 9:43 PM, <jab at math.brown.edu> wrote:
>>
>>> Hey Racket Users,
>>>
>>> Just trying Racket for the first time, and very excited to finally be
>>> learning it! I've been wanting to for years.
>>>
>>> Just had my first encounter with DrRacket, and am trying to get
>>> comfortable with keyboard input. According to
>>> http://docs.racket-lang.org/drracket/Keyboard_Shortcuts.html,
>>>
>>> On Windows and Mac OS X, Meta is only available through the Escape key.
>>>>
>>>
>>> Sorry to see it's not possible to bind the Alt/Option key to Meta, as it
>>> is with e.g. Terminal.app, as it would be a huge usability win; the Escape
>>> key on most keyboards is one of the hardest to reach, aggravating RSI the
>>> world over. In
>>> http://lists.racket-lang.org/users/archive/2010-August/041085.html, a
>>> post from 2010, Matthew Flatt alludes to adding support for Option as Meta
>>> after a soon-coming GUI rewrite, but I found no further mention of it here,
>>> on GitHub (https://github.com/plt/racket/search?q=meta&type=issues), or
>>> elsewhere.
>>>
>>> Just thought I'd inquire again about the possibility. On the off chance
>>> it's a matter of submitting a newcomer-friendly patch, I'd be delighted to
>>> give it a shot.
>>>
>>> Thanks for reading, and thanks for the great work on Racket.
>>>
>>> ____________________
>>>   Racket Users list:
>>>   http://lists.racket-lang.org/users
>>>
>>>
>>
>
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