Hi if I have a simple editor-canvas% with text% in it:
(define editor-canvas (new editor-canvas% [parent frame]))
(define text (new text%))
(send editor-canvas set-editor text)
1. How do I make the standard right click menu with copy, paste, etc.?
I've seen this example of a custom popup menu:
In typed Racket I define a hashtable:
(: vector-to-contract (HashTable TType CContract))
(define vector-to-contract
(make-hash
(cast '(
(_bytes . bytes?)
(_s8vector . s8vector?)
(_u16vector . u16vector?)
(_s16vector . s16vector?)
The problem here is with the optional third argument to `hash-ref`.
Typed Racket only allows `#f` or functions as the third argument.
Plain Racket allows any non-function value as a default, or a function
which is called to produce the default. Since "any non-function" is
not expressible in Typed
On Tue, Apr 21, 2020 at 10:50:44AM -0400, Sam Tobin-Hochstadt wrote:
> The problem here is with the optional third argument to `hash-ref`.
> Typed Racket only allows `#f` or functions as the third argument.
> Plain Racket allows any non-function value as a default, or a function
> which is called
On Tue, Apr 21, 2020 at 05:30:40PM -0400, John Clements wrote:
> Are you asking because you’d like your own code using SXML to be typed, or
> because you’d like the sxml implementation to be typed? I think another way
> of asking this is: are you worried about bugs in your code, or about bugs in
On Mon, Apr 20, 2020 at 6:50 PM Jon Zeppieri wrote:
> There's no trick to it:
>
> #lang racket/base
>
> (require racket/generic)
>
> (define-generics foo
> (foo-do foo x))
>
> (struct thing (x)
> #:methods gen:foo
> [(define (foo-do f x)
> (thing x))])
>
>
> On Mon, Apr 20, 2020 at
Well, sure… once you open all the files. Opening all the files is the painful
part. Also, the display of tabs is not totally great when you have sixty or
seventy of them open. Sorry, it might not have been clear that I want a list of
sixty or seventy files.
John
> On Apr 21, 2020, at 1:34 PM,
Are you asking because you’d like your own code using SXML to be typed, or
because you’d like the sxml implementation to be typed? I think another way of
asking this is: are you worried about bugs in your code, or about bugs in
Oleg’s code? I think that rewriting the sxml library into TR would
Here’s a question I have about both DrRacket and Emacs. It often happens in my
workflow (grading files, for instance) that I want to set up a list of files,
and then have an easy way to move forward or back in that list (“next file”,
“previous file”). I see that emacs has a function called
Ah, got it. Well, as to opening all the files, you can select them all in
Finder and Cmd+O. (Presumably the equivalent works on Windows.) Can't help
you with the aesthetics, sorry.
On Tue, Apr 21, 2020 at 4:38 PM John Clements
wrote:
> Well, sure… once you open all the files. Opening all the
Is there a typed version of sxml?
Its data representation would seem to be fairly easy to specify by a few
corecursice define-type's.
I's like to get the result of
(ssax:xml->sxml in '())
as a typed value without having to waste time doing an exhaustive
run-time type-check on its output.
I don't use DrRacket much, but would the normal 'previous / next window'
commands work for you? On Mac it's:
previous window: Shft + Cmd + ~
next window: Cmd + ~
or
previous window: Cmd +
next window: Cmd +
On Tue, Apr 21, 2020 at 4:29 PM 'John Clements' via Racket Users <
I'm finally finishing up a major overhaul of Plisqin, my alternative to
SQL. I don't think I will consider it "stable" just yet, but it is getting
much closer. The biggest new feature is a type system that prevents the
three-valued logic mistakes that are too easy to make in SQL. I also hope
Hi folks,
Here is a new package providing lightweight, general purpose utilities for
working with tree-structured data:
https://docs.racket-lang.org/lazytree/
It allows you to take any data exhibiting tree structure and lazily
construct a stream representation of it using functions that
I would love that, but they’re not all in one directory. Maybe the easiest
solution would be to write a script to temporarily move them all into one
directory. In fact, as I think about this harder, I realize that the biggest
problem may be that Apple’s file dialog doesn’t facilitate moving
A (Racket) script that calls "open" (on a mac) and uses some state to keep
track of what "next" means seems straightforward. Probably this can also be
integrated via quickscript so It becomes a key binding. And maybe you want
some small number of key bindings that assign grades and then move on to
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