Racket code that could perform this list manipulation?
(every-n-lists-into-list '())
(every-n-lists-into-list 1 '((1) (2))) ;=> '(((1) (2)))
(every-n-lists-into-list 2 '((1) (2) (3) (4))) ;=> '(((1) (2)) ((3) (4)))
(every-n-lists-into-list 3 '((1) (2) (3) (4)) (5) (6))) ;=> '(((1) (2) (3))
((4)
I could use some help narrowing down this problem using plt-web-server:
Context:
I can successfully run all code described in: Continue: Web Applications in
Racket, Chapters 1 through 17.
However, 'Chapter 18: Using HTTPS' where I run plt-web-server is giving me
a problem.
(I am using
Any ideas what I can do to stop getting this message anytime I have
DrRacket running in 2 terminals in different workspaces on linux/Ubuntu.
"Error saving preferences" is the title in the popup window.
Text in the window is:
"The preferences file is locked (because ...) so your preference change
Should I be posting questions about Racket in us...@racket-lang.org?
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6, 2021 at 7:23:15 PM UTC-6 Philip McGrath wrote:
> On Sun, Jun 6, 2021 at 7:59 PM Ben Greenman wrote:
>
>> On 6/6/21, Don Green wrote:
>> >
>> > Can a new user defined pkg encompass nothing more than references to
>> > previously defined pkgs so tha
Where is the documentation that describes how to interpret the racket
syntax?
For example:
(get-file (message parent directory ...)) ;where the arg list of options
are optional but if included are positional meaning that to specify an
argument such as 'directory' means that the previous 2 args
I want the file manipulation popup in racket/gui to display a specified
dir, not the current directory.
Is that possible?
(get-file #f f) ;displays the popup showing the current directory in frame
f.
I expected the following to display the popup showing the specified
directory but it does not:
Can I break my racket/gui program be broken down into multiple modules?
I am able to require modules through the callback function but not the GUI
definitions themselves.
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Is it possible to effectively display a window with a bitmap background?
In racket/gui, I can see how to apply a bitmap to a button.
If the only way to display a bitmap is in a button, is it practical to size
the button to the entire frame or pane in the frame?
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Racket documentation claims that copy-file preserves attributes but I find
that this is not the case. The destination file date is the current date,
not the source file date.
Comments?
Don
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To
>From Racket doc: "File permissions are transferred from src to dest; on
Windows, the modification time of src is also transferred to dest."
Is the above line meant to imply that a unix/linux version of Racket will
NOT preserve file attributes using copy-file?
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After upgrading to racket v.8.0, the DrRacket 'run' button does not work
consistently with one click.
Previously, a single click of the 'run' button performed it's function.
Now, I must cycle between clicking on the 'run' button, then click anywhere
in the body of the window and repeat until the
(current-library-collection-paths)
'(#
# #)
I suspect the above is incorrect because I think the 8.1 path should be to
dir: /pkgs rather than /collects. Like this:
#
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4, 2021 at 7:21:17 AM UTC-6 Matthew Flatt wrote:
> At Thu, 3 Jun 2021 20:26:59 -0700 (PDT), Don Green wrote:
> > Using DrRacket in linux:
> > When I run DrRacket from a terminal,
> >
> > (current-library-collection-paths) returns the expected paths, 3 of them.
> &g
Now that I have learned of: config.rktd,
I think I'd rather use it, if it can be used to set
current-library-collection paths.
Should I just add to the config.rktd hash list:
(current-library-collection paths .
'(#
# #))
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When I run drracket v 8.1 the additional collection is in effect as
evidenced by:
(current-library-collection-paths) returns:
'(#
# #)
however when I open drracket by clicking on a .rkt file
(current-library-collection-paths) returns:
'( #
#)
How to fix this?
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rch-paths
> <https://docs.racket-lang.org/reference/collects.html?q=PLTCOLLECTS#%28def._%28%28quote._~23~25kernel%29._use-user-specific-search-paths%29%29>
> ) in each case?
> On 6/5/21 6:39 PM, Don Green wrote:
>
> When I run drracket v 8.1 the additional collection is i
Can a new user defined pkg encompass nothing more than references to
previously defined pkgs so that every user created module references a
single user defined pkg?
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Using DrRacket in linux:
When I run DrRacket from a terminal,
(current-library-collection-paths) returns the expected paths, 3 of them.
However, when I open one of my .ss files which is associated with drracket,
the file opens in drracket but (current-library-collection-paths) returns
only 2
Is it possible to specify a hierarchy of menu-item options in racket/gui
more than 2 deep?
In other words, I am able to define menu-item options such that I do get a
menu-bar with options that present sub options and I can call functions
using 'callback' from those suboptions, but I have thus
How do I create a scrollable popup window?
I can create a dialog that is a popup but it is not scrollable.
The dialog class does not appear to have a scroll option.
Is this where I use a 'panel' class instead of the 'dialog' class?
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When I specify as follows:
(define dialog2 (new dialog%
(label "Get-Prototype-dialog")
(style resize-border)
))
Returned error:
resize-border: unbound identifier in: resize-border
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Using Racket on Ubuntu. Was Racket version 7 now version 8.
New default racket-prefs file is in effect.
Still have access to older versions of racket-prefs.
Thought the new Racket install would continue to reference my previous
racket-prefs file.
a) Any thoughts about why any time I install new
> What if he has directories that aren’t part of an installed package? That
>> was my concern, and why I suggested manually deleting compiled subdirs.
>>
>
> That's right, but given:
>
> On Tue, Apr 13, 2021 at 8:16 PM Don Green wrote:
>
>> Welcome to Racket v
"You do not have permission to respond to author in this group."
upon clicking button [Respond To Author]
in Google Groups/ Racket
Is there a setting I can change or is just the way this group is configured
for all?
Thanks
Don
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apt get upgrade
Since Racket was installed on my system, apt get upgrade goes out and finds
the latest version of Racket and installs it. version 8.
I was having no problems with Racket.
In the future I'll use PPA to install new Racket versions when I want them
- and all to a single directory.
How to make a previously installed version of Racket current?
My O.S. is linux Ubuntu.
Is it a matter of running:
raco pkg install ...
again.
Thanks
Don.
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I have several versions of racket installed on Ubuntu linux at default
linux locations.
I think I should uninstall them all.
Then after downloading a PPA from the racket web site
install the version I want to a single directory. (I would be downloading
version: 7.8)
Does this sound like a plan
I have several versions of Racket installed.
Is there a way to switch between using one version and another? Example:
use Racket 8
then switch back to using Racket 7.
If there is no point in going back to a previous version, is there merit in
removing older versions.
Thanks. Don.
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Creating a frame width that is half of the width given by
(get-display-size), then moving the resulting window to the right and left
of the screen you can see that if you had 2 windows of the same size they
would not touch each other as you would expect.
For some reason, dividing the total
In the case where there exists a vertical Operating System toolbar:
Creating a frame width that is half of the width given by
(get-display-size), then moving the resulting window to the right and left
of the screen you can see that if you had 2 windows of the same size they
would not touch
Is it true that 2 side-by-side frames must not be placed within a
horizontal-pane because the a frame's parent can only be another frame?
Thanks
Don
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Is there a racket/gui fn that returns width of an Operating System vertical
toolbar?
In linux and I imagine on Windows and macOS, when there exists a vertical
OS toolbar the values returned by get-display-size and get-client-size are
the same and are insufficient.
So,
Is there a racket/gui fn
When I specify 2 frames to be side-by-side using racket/gui, I believe I
would have no problem if all my prospective client platform did not have a
vertical Operating System taskbars.
Since I do have such a taskbar I must use code that takes the width of the
taskbar into account.
Since I
Looking to trigger the end of a loop by the creation of a file.
Is this possible? Is this advisable?
Currently using:
a 'for' loop with
a 'for' loop guard expression to test for the existence of a file.
Tried file-exists? but that does not seem appropriate.
Tried using Racket function:
Does Racket have a function that returns the Package Source set in DrRacket?
The value can be set in:
DrRacket/Package Manager/Package Source:
I am looking for a way to obtain that value.
Thanks
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The Racket Web Server makes use of a default index.html file that contains
the following 2 lines:
Welcome to the Racket Web server!
:
Please replace this page with your favorite index page.
Since relplacing the file is not sufficient to effect the change, I think
it must be necessary force
$ raco setup ?
collection-path: collection not found
collection: "t"
How do I go about finding and removing: collection: "t" ?
Thanks.
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$ raco setup ?
collection-path: collection not found
collection: "t"
in collection directories:
/home/don/.plt-scheme/4.2.1/collects
/home/don/.racket/8.1/collects
/home/don/racket/collects/
... [175 additional linked and package directories]
Thanks
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For some reason, the collection directories below does not include the only
collection directory that I use:
/home/don/.plt-scheme/4.2.1/collects
which I do have showing up in DrRacket's options: /Language/Choose
Language/ Collection Paths:
<>
/home/don/.plt-scheme/4.2.1/collects
I don't see why the collection resolver has a problem because the desired
collection path: #, is shown to
be in the current-library-collection-paths:
(current-library-collection-paths)
'(# #
#)
Thanks
Don.
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I can successfully serve one stateless webserver from one racket webserver
file.
I'd like to serve multiple stateless webservers from one racket webserver
file.
(define (my-app req)
(response/full
200 #"Okay"
(current-seconds) TEXT/HTML-MIME-TYPE
empty
(list (string->bytes/utf-8
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