[racket-users] 7 GUIs

2019-06-01 Thread Matthias Felleisen 

Someone recently mentioned the “7 GUIs” task. I spent a couple of days to write 
up minimal solutions: 

 https://github.com/mfelleisen/7GUI/blob/master/task-7.rkt 
 

In my spare time, I will develop this repo in more depth (types, units, etc) 
because it looks like a reasonably educational task. 


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Re: [racket-users] New Package: Dynamic FFI - Write C Code Inline

2019-06-01 Thread Alexis King 
This looks extremely cool. Thanks for your hard work—I will probably give this 
a try next time I use the FFI.

Alexis

> On Jun 1, 2019, at 14:06, David Benoit  
> wrote:
> 
> Hi All,
> 
> I've recently released a new library 
>  for dynamically generating 
> FFI bindings to C by parsing header files.
> It also allows users to create FFI libraries by writing C functions directly 
> inline in Racket programs.  
> 
> The library works as a native extension to Racket by linking with Clang's 
> parser libraries and converting AST declarations into FFI objects.
> As a result, the package depends on Clang and LLVM headers and libraries.  
> See the documentation  
> for info on installing dependencies.
> 
> I've only built the package on GNU/Linux so far.  If anyone is interested in 
> building the library on other OSes, it should be a fairly trivial port.
> 
> I'd like to give a special thanks to Jay McCarthy, who came up with the idea 
> for this project and was my adviser during its implementation.
> I hope its something the Racket community might find useful!
> 
> More usage examples are available in the docs and the test directory 
>  in the source 
> code.
> 
> Thanks!
> David B
> 
> I'll sign off with a quick preview:
> 
> #lang at-exp racket/base
> 
> (require dynamic-ffi/unsafe)
> 
> @define-inline-ffi[struct-test]{
>   #include 
>   #include 
>   #include 
> 
>   typedef struct {
> char *name;
> uint64_t value;
>   } number;
> 
>   char* names[] = {"zero", "one", "two", "three", "four", "five", "six"
>  "seven", "eight", "nine", "ten", "eleven", "twelve"};
> 
>   number add(number a, number b) {
> number c;
> c.value = a.value + b.value;
> if (c.value >12)  {
>   fprintf(stderr, "error: this example can only count to twelve...\n");
>   exit(1);
> }
> c.name = names[c.value];
> return c;
>  }
> }
> 
> ;; _list-structs are created by default.  I hope to optimize this in the 
> future.
> 
> (define n2 (list "two" 2))
> 
> (define n7 (list "seven" 7))
> 
> (printf "add(n2, n2): ~a\n" (struct-test 'add n2 n2))  ;; output: add(n2, 
> n2): (four 4)
> (printf "add(n7, n7): ~a\n" (struct-test 'add n7 n7))  ;; output: error: this 
> example can only count to twelve...
> 
> 
> 
> 
> 
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>  
> .
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[racket-users] New Package: Dynamic FFI - Write C Code Inline

2019-06-01 Thread David Benoit 
Hi All,

I've recently released a new library 
 for dynamically 
generating FFI bindings to C by parsing header files.
It also allows users to create FFI libraries by writing C functions 
directly inline in Racket programs.  

The library works as a native extension to Racket by linking with Clang's 
parser libraries and converting AST declarations into FFI objects.
As a result, the package depends on Clang and LLVM headers and libraries.  
See the documentation  
for info on installing dependencies.

I've only built the package on GNU/Linux so far.  If anyone is interested 
in building the library on other OSes, it should be a fairly trivial port.

I'd like to give a special thanks to Jay McCarthy, who came up with the 
idea for this project and was my adviser during its implementation.
I hope its something the Racket community might find useful!

More usage examples are available in the docs and the test directory 
 in the source 
code.

Thanks!
David B

I'll sign off with a quick preview:

#lang at-exp racket/base

(require dynamic-ffi/unsafe)

@define-inline-ffi[struct-test]{
  #include 
  #include 
  #include 

  typedef struct {
char *name;
uint64_t value;
  } number;

  char* names[] = {"zero", "one", "two", "three", "four", "five", "six"
 "seven", "eight", "nine", "ten", "eleven", "twelve"};

  number add(number a, number b) {
number c;
c.value = a.value + b.value;
if (c.value >12)  {
  fprintf(stderr, "error: this example can only count to twelve...\n");
  exit(1);
}
c.name = names[c.value];
return c;
 }
}

;; _list-structs are created by default.  I hope to optimize this in the future.

(define n2 (list "two" 2))

(define n7 (list "seven" 7))

(printf "add(n2, n2): ~a\n" (struct-test 'add n2 n2))  ;; output: add(n2, n2): 
(four 4)
(printf "add(n7, n7): ~a\n" (struct-test 'add n7 n7))  ;; output: error: this 
example can only count to twelve...





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Re: [racket-users] outreach reddit /r/learnprogramming

2019-06-01 Thread Stephen De Gabrielle 
Thanks,
I have set up an ifttt applet to email me if someone posts to
r/learnprogramming and includes the word racket so I can try answer if I
see the question and have the required time and knowledge to respond:
>If New post from search 'subreddit:learnprogramming Racket', then Send
yourself an email

I have similar set up for r/racket.

NB If I don't know the answer I try to direct them to the racket-users or
some site with other racketeers:
https://github.com/racket/racket/wiki/How-to-get-help

Stephen


On Sun, May 26, 2019 at 9:10 PM Neil Van Dyke  wrote:

> If you want an interesting place to do outreach for Racket,
> `/r/learnprogramming` has almost a million subscribers, and a search
> suggests that questions about Racket (and criticisms) tend to go
> unanswered:
>
> https://old.reddit.com/r/learnprogramming/
>
> https://old.reddit.com/r/learnprogramming/search?q=racket_sr=on
>
> https://old.reddit.com/r/learnprogramming/search?q=htdp_sr=on
>
> You can answer things, and point documentation, packages, etc., and also
> suggest that all the action is on `racket-users`.
>
> I was reminded of `/r/learnprogramming` when it was mentioned as as a
> venue for sneaky influencing, in this:
>
> https://www.nemil.com/musings/hack-an-engineer.html
>
> You can also promote Racket there in non-reactive ways, with posts and
> such, but don't take the sneaky bits in the article above as
> prescriptive, and repeat the mantra: Don't Be Evil (Really).
>
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