[racket-users] Racket News - Issue 35

Hey all, Issue 35 is here: https://racket-news.com/2020/07/racket-news-issue-35.html Apologies for the slight delay but I started feeling quite poorly yesterday evening as I was about to finish the editing of the issue. Have a great day and Enjoy! Paulo Matos -- You received this message bec

Re: [racket-users] Font bearing - lining up texts and outlines

Den man. 20. jul. 2020 kl. 19.14 skrev Jens Axel Søgaard < jensa...@soegaard.net>: > Thanks for the response. > > I have attempted to go in your foot steps and have made a single file > example, so it is easy to try out. > Just to recap, the goal is to get the vertical bearing. > > The first step

[racket-users] Re: Removing duplicates from a list while still maintaining order in Dr. Racket.

Could you point us to the original homework question so we can be sure of the requirements? Thanks. On Monday, July 20, 2020 at 12:04:45 PM UTC-4, JJ C wrote: > > In Beginning Student with List Abbreviations > > I am struggling to come up with functions to remove duplicates from a list > while m

Re: [racket-users] Font bearing - lining up texts and outlines

The `fontland` library does not have an official public API but it will give you the answer, which is 1446. #lang racket (require fontland fontland/ttf-glyph) (define f (open-font "/System/Library/Fonts/Supplemental/Arial Unicode.ttf")) ;; `layout` uses OpenType positioning & substitution tables

[racket-users] combining require, build-path, and namespaces

How I can combine these three? I want to do something like this: (define n (make-base-namespace)) (define p (build-path f)) (eval `(require ,p) n) Racket doesn't like that: bad syntax for require sub-form because p is a path-typed value. Essentially, I want to inject the module at f

Re: [racket-users] combining require, build-path, and namespaces

Den tir. 21. jul. 2020 kl. 17.45 skrev Shriram Krishnamurthi < shri...@gmail.com>: > How I can combine these three? I want to do something like this: > > (define n (make-base-namespace)) > (define p (build-path f)) > (eval `(require ,p) n) > > Racket doesn't like that: bad syntax for r

Re: [racket-users] Creating links to Racket docs for functions in user-scope packages

It looks like the problem might be in this function where it always constructs a path that is relative to (find-doc-dir). Would it make sense instead to have it check the dest against all the paths

Re: [racket-users] combining require, build-path, and namespaces

Thank you! Would you know why I might get this error: ; require: unknown module ; module name: ; #> (This is from inside a module.) Trying the same at the REPL, I see the same thing: > (define n (make-base-namespace)) > (namespace-require `(file ,(path->string (build-path "wheats" "w1.

[racket-users] Sending a file descriptor along a socket?

It looks like ffi/unsafe/port provides ways to read a file desciptor from a port that is capable of receiving them, and there are tools to transform that file descriptor into a port or the reverse, but is there a way for me to *write* a file descriptor to a port (ie, the equivalent to the sendmsg p

Re: [racket-users] combining require, build-path, and namespaces

This is weird. I usually parameterize current-namespace when using namespace-* functions, and in this particular case it works fine. On Tue, Jul 21, 2020 at 11:05 AM Shriram Krishnamurthi wrote: > Thank you! Would you know why I might get this error: > > ; require: unknown module > > ; module

Re: [racket-users] combining require, build-path, and namespaces

Den tir. 21. jul. 2020 kl. 20.25 skrev Sorawee Porncharoenwase < sorawee.pw...@gmail.com>: > This is weird. I usually parameterize current-namespace when using > namespace-* functions, and in this particular case it works fine. > > On Tue, Jul 21, 2020 at 11:05 AM Shriram Krishnamurthi > wrote: >

[racket-users] Re: combining require, build-path, and namespaces

Do you definitely want *only* definitions explicitly provide-ed by the module, or is it acceptable (or even desirable) to see *all* module definitions? If the latter, you could use module->namespace. On Tuesday, July 21, 2020 at 11:45:38 AM UTC-4, Shriram Krishnamurthi wrote: > > How I can comb

[racket-users] Combining generators and typed racket

Do generators and typed racket work together well? It seems (yield) doesn't have a type and i couldn't get my module to work. Is there a way to make some procedure untyped in the middle of a typed file? Is it just best to break these things into separate files? Thank you Nate -- You received t

Re: [racket-users] combining require, build-path, and namespaces

Ooh, thank you Oak and Jens Axel! I would never have figured that out. As Matthew's email from Jan 2020 says, having the documentation say something (and, in particular, suggesting the use of `parameterize` to get what many users might expect) would be quite lovely. (Thanks also, Greg.) Shriram

[racket-users] Re: Combining generators and typed racket

Actually, is there any way at all to use lazy lists of things (streams or generators) in typed racket? Nate On Tue, Jul 21, 2020 at 8:45 PM Nate Griswold wrote: > Do generators and typed racket work together well? It seems (yield) > doesn't have a type and i couldn't get my module to work. > >