Re: [racket-users] Anyone successfully filtering Italian spam?

[Aidan Gauland]

I am on Fastmail, which uses SpamAssassin (their methodology is detailed 
here 
), 
and after many many months of training it on this loon's spam messages, 
it is finally /mostly/ filtering correctly.  Very few legitimate 
messages are getting sent to the spam bin now. (This is across multiple 
OSS mailing-lists.)


I hope this information helps somewhat.

On 1/12/21 12:57 am, Stephen De Gabrielle wrote:
I’m using gmail for racket-users, but the normally reliable spam 
filtering fails - despite numerous attempts to train - it still 
classifies real mail as spam and the spam as real.

S.


On Tue, 30 Nov 2021 at 03:38, George Neuner > wrote:



On 11/29/2021 6:45 PM, Nathaniel Griswold wrote:
> It’s getting through my filters, neither rspamd or my local
client can catch on to it.
>
> Is there a good simple filter?
>
> Nate

Something has changed very recently because until this last week I
rarely saw it (even marked AS spam) ... maybe a few times this whole
year.  But in the last week I have gotten one or more copies in my
inbox
every day.

I use Thunderbird for email - which has a built-in learning junk
filter
- but I assumed my provider was filtering it because - sans a
specific
rule - Thunderbird would have just put in the Junk folder. I just
wasn't
seeing it.

???
George



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[racket-users] Retro 3D maze with Pict?

[Aidan Gauland]

Would it be feasible to use Pict to create a very simplistic rendering 
of a first-person perspective of a 2D maze, in the style of Scarab of Ra 
 for the old 
B&W Macs?


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Re: [racket-users] Re: Alternative UI toolkits

[Aidan Gauland]

That would be Electron , for which I think
Racket would be a /really/ awkward fit, but if anyone has a crack at it,
I'd be very interested to see the result.

On 6/08/19 9:06 AM, Stephen De Gabrielle wrote:
> Sorry, I meant whatever is used to make Visual Studio Code, and
> whatever the Mozilla equivalent is.
>
> s.
>
> On Monday, August 5, 2019 at 6:07:34 PM UTC+1, Neil Van Dyke wrote:
>
> XUL itself is deprecated/dead.  There might be an interesting (but
> niche) Racket opportunity with WebExtensions, and you might want
> to wait
> to see how they decide WASM fits into that, and what Racket's WASM
> story
> becomes.
>
> Also, bit of gut-feel speculation... There's some odd
> noises/rumblings
> going on with browser extensions (and PR of same) in recent
> months, and
> a few I noticed in the last week.  Anyone contemplating a new project
> based on browser extensions should consider that the rules might be
> changing soon, more likely than in the past.  (Beyond Chrome
> anti-ad-blocking moves, which also was a gift to Mozilla when they
> needed it.  But possibly other restrictions, such as in what else
> extensions can do, and on who can effectively publish what
> extensions. 
> And maybe an improved or new monetization option.)
>
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Re: [racket-users] Re: SQL DB tooling

[Aidan Gauland]

That looks like exactly what I want.  Thanks!

On 23/03/19 8:04 PM, Alex Harsanyi wrote:
>
> The package is called "north" and you can find it here:
>
> https://pkgs.racket-lang.org/package/north
>
> There is also the announcement on Reddit:
>
> https://www.reddit.com/r/Racket/comments/akob56/ann_north_database_migrations/
>
> Alex.
>
>
> On Saturday, March 23, 2019 at 12:40:48 PM UTC+8, Aidan Gauland wrote:
>
> I see that Racket has a couple of nice libraries for talking to SQL
> databases <https://docs.racket-lang.org/db/
> <https://docs.racket-lang.org/db/>> and
> <https://docs.racket-lang.org/sql/
> <https://docs.racket-lang.org/sql/>>, but I have been unable to
> find any
> equivalent to the so-called "migrations" capability of DB
> libraries from
> other languages (see
> <http://sequel.jeremyevans.net/rdoc/files/doc/migration_rdoc.html
> <http://sequel.jeremyevans.net/rdoc/files/doc/migration_rdoc.html>>
> and
> <https://hexdocs.pm/phoenix/ecto.html
> <https://hexdocs.pm/phoenix/ecto.html>>  for examples).  Is there
> anything like this for Racket, or even some language-agnostic, CLI
> tool
> that does the same thing?
>
> Thanks,
> Aidan Gauland
>
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[racket-users] SQL DB tooling

[Aidan Gauland]

I see that Racket has a couple of nice libraries for talking to SQL
databases <https://docs.racket-lang.org/db/> and
<https://docs.racket-lang.org/sql/>, but I have been unable to find any
equivalent to the so-called "migrations" capability of DB libraries from
other languages (see
<http://sequel.jeremyevans.net/rdoc/files/doc/migration_rdoc.html> and
<https://hexdocs.pm/phoenix/ecto.html>  for examples).  Is there
anything like this for Racket, or even some language-agnostic, CLI tool
that does the same thing?

Thanks,
Aidan Gauland

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Re: [racket-users] lexer-parser approach in Racket [was the list of languages made with racket [Hacker News]]

[Aidan Gauland]

On 2/03/19 3:27 AM, Matthias Felleisen wrote:
>> On Mar 1, 2019, at 2:15 AM, Aidan Gauland  wrote:
>>
>> On 24/02/19 12:08 PM, Matthias Felleisen wrote:
>>> 2. The means of implementation in Racket are radically different from a 
>>> lexer-parser approach.
>> Wait, does this mean that the Beautiful Racket book is leading me down the 
>> wrong path?  I'm in the middle of the bf chapter 
>> <https://beautifulracket.com/bf/>, which (if I am understanding it 
>> correctly, is using a lexer and a parser.
> Please read this comment in context. This line is a response to a particular 
> point raised in the Reddit link of the original post. On this Reddit thread, 
> someone seems to confuse creating DSLs with writing new syntax for 
> more-or-less standard semantic concepts. For such people, it matters to find 
> a conventional Lex-Yacc (replace with modern words) tool chain plus perhaps 
> some support for backend creation.
>
> [snip]

I apologise for missing the context; I did take a look at the thread,
but I still misunderstood your remark initially.  Thanks for the
clarification.

Regards,
Aidan Gauland

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Re: [racket-users] lexer-parser approach in Racket [was the list of languages made with racket [Hacker News]]

[Aidan Gauland]

On 24/02/19 12:08 PM, Matthias Felleisen wrote:
> 2. The means of implementation in Racket are radically different from a 
> lexer-parser approach.

Wait, does this mean that the /Beautiful Racket/ book is leading me down
the wrong path?  I'm in the middle of the bf chapter
, which (if I am understanding it
correctly, is using a lexer and a parser.

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[racket-users] Re: FrTime basics

[Aidan Gauland]

On 13/08/15 22:55, Aidan Gauland wrote:
> Are there any non-graphical FrTime demos?  I'm trying to figure out how
> to define your own behaviors, and just going by the manual
> <http://docs.racket-lang.org/frtime/>, it seems rather imperative in
> nature, which is not what I understood it to be from reading the
> whitepaper.
> <https://cs.brown.edu/people/sk/Publications/Papers/Published/ck-frtime/paper.pdf>
> [snip]

Something seemed to click in my head last night after my original post,
and it occurred to me to try this (in DrRacket).

Welcome to DrRacket, version 6.2 [3m].
Language: FrTime; memory limit: 128 MB.
> (define rx (event-receiver))
> (define foo (+ 3 (hold rx)))
> foo

> (send-event rx 5)
;; The  magically changes to 8.
>

So I think I've got it now.  I suspect I'll have to pick Greg Cooper's
brain about FrTime's innards and undocumented public procedures, once
I've been using it (the documented part of it, anyway) for a while.

--Aidan

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[racket-users] FrTime basics

[Aidan Gauland]

Are there any non-graphical FrTime demos?  I'm trying to figure out how
to define your own behaviors, and just going by the manual
<http://docs.racket-lang.org/frtime/>, it seems rather imperative in
nature, which is not what I understood it to be from reading the
whitepaper.
<https://cs.brown.edu/people/sk/Publications/Papers/Published/ck-frtime/paper.pdf>

I see that the definition of 'seconds' is using set-signal-thunk! and
set-signal-value!, which are not exported by the library (in other
words, not part of the language).

Have I completely misunderstood how FrTime is meant to be used?  Have I
hit its limitations, still being in the early states?  Or have I simply
been tripped up by gaps in the documentation?

Regards,
Aidan Gauland

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[racket-users] Re: Defining contracts sanely

[Aidan Gauland]

On 23/06/15 00:00, Robby Findler wrote:
> On Mon, Jun 22, 2015 at 2:43 AM, Aidan Gauland:
>>> If this does what you want, it’s fine, but the define/contract is probably 
>>> unnecessary, and
>>> (define fish-freshness/c
>>>   (flat-named-contract ‘fish-freshness/c
>>> (lambda (x)
>>>   (not (eq? ….)
>>> Should do what you want.
>>
>> So are contracts on contracts generally unnecessary?
> 
> No, the right generalization to draw here is that contracts aren't
> necessary when it is "obvious" that they can never signal blame. As
> another example, this:
> 
>   (define/contract (f x) (-> integer?) 3)
> 
> isn't really a helpful contract.
> 
> The reason why the other generalization isn't right has to do with the
> fact that contracts are themselves code and, like all code, can be
> buggy.

That makes more sense.  So far the only contracts I've looked at or
written have been trivial.  And thanks for pointing me at some complex
contracts for comparison.

--Aidan

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[racket-users] Re: Defining contracts sanely

[Aidan Gauland]

On 22/06/15 04:26, Alexander D. Knauth wrote:
> 
> On Jun 21, 2015, at 5:41 AM, Aidan Gauland wrote:
> 
>> Say I want to define a flat contract for the "freshness" field of my
>> fish class, so I define a contract for it like so:
>>
>> (define/contract fish-freshness/c
>>  (-> any/c
>>  boolean?)
>>  (flat-named-contract 'fish-freshness/c
>>(lambda (x)
>>  (not (eq? #f (member x '(fresh frozen edible rotten)))
>>
>> Am I barking up the wrong tree here, or is this perfectly sensible?
> 
> If this does what you want, it’s fine, but the define/contract is probably 
> unnecessary, and
> (define fish-freshness/c
>   (flat-named-contract ‘fish-freshness/c
> (lambda (x)
>   (not (eq? ….)
> Should do what you want.

So are contracts on contracts generally unnecessary?

> The flat-named-contract is also probably unnecessary (though it can be useful 
> if the name isn’t just a symbol), so
> (define (fish-freshness/c x)
>   (not (eq? ….)))
> Will also do what you want.

This just defines a procedure, not a `flat-contract' type.  (Although I
admit I am unclear on what is special about a flat-contract.)

> And finally, another way of doing this would be:
> (define fish-freshness/c (or/c ‘fresh ‘frozen ‘edible ‘rotten))
> 
> Or if you prefer giving the contract a better name for error messages:
> (define fish-freshness/c
>   (flat-named-contract ‘fish-freshness/c (or/c ‘fresh ‘frozen ‘edible 
> ‘rotten)))

Ah, I didn't realise that or/c could be used like this.  That's much
simpler when the condition is simply "is one of these symbols".

> Any one of these is “sane” as long as they work, and it depends on which one 
> you think looks more readable, makes you’re intent clear, and gives error 
> messages that make sense.

I suppose "cleanly" would have been a better word for the thread
subject, since I would have to be really clueless to be unsure whether
my code is sane. :P

> I just finished this when I saw Matthias Felleisen’s reply.  I’m sending it 
> anyway.

I appreciate it.  His solution was taking my toy example a little too
seriously, although I may have to steal it for my fish client/server. ;)
 I see he uses one-of/c, which is deprecated in favour of or/c
(according to the Racket 6.1.1 Reference).

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[racket-users] Defining contracts sanely

[Aidan Gauland]

Say I want to define a flat contract for the "freshness" field of my
fish class, so I define a contract for it like so:

(define/contract fish-freshness/c
  (-> any/c
  boolean?)
  (flat-named-contract 'fish-freshness/c
(lambda (x)
  (not (eq? #f (member x '(fresh frozen edible rotten)))

Am I barking up the wrong tree here, or is this perfectly sensible?

Regards,
Aidan Gauland

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Re: [racket-users] Inheritance problem with private methods

[Aidan Gauland]

Ah, yes, I even knew this because I have another private method that I
call like this.  In the same class even, staring me right in the face.
Ah, well.  Thanks for your help!

On 23/04/15 22:40, Alexander D. Knauth wrote:
> If you do this, it works:
> (define/override (a-method)
>   (displayln "Hello from sub class")
>   (another-method))
> Because `another-method` is a private method, send doesn’t know about it (I 
> think; I haven’t used private methods much).  
> 
> On Apr 23, 2015, at 5:41 AM, Aidan Gauland  wrote:
> 
>> I get a method-lookup failure when I try to call, from a method
>> override, a method defined in the overriding class.  (See attached
>> program source.)  What do I need to be doing differently for this to work?
>>
>> Thanks,
>> Aidan


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[racket-users] Inheritance problem with private methods

[Aidan Gauland]

I get a method-lookup failure when I try to call, from a method
override, a method defined in the overriding class.  (See attached
program source.)  What do I need to be doing differently for this to work?

Thanks,
Aidan

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#lang racket

(define top-class%
  (class object%
(super-new)

(define/public (a-method)
  (displayln "Hello from top class"

(define sub-class%
  (class top-class%
(super-new)

(define/private (another-method)
  (displayln "Hello from another method"))

(define/override (a-method)
  (displayln "Hello from sub class")
  (send this another-method

(send (new sub-class%) a-method)

Re: [racket] Hierarchical loggers

[Aidan Gauland]

Matthew Flatt  writes:
> Every once in a while, I find that option 2 works well with the pattern
>
>  foo.rkt:
>#lang racket
>(define-logger foo) ; uses `(current-logger)`
>
>  bar.rkt:
>#lang racket
>(define-logger bar) ; uses `(current-logger)`
>
>  main.rkt:
>#lang racket
>(require "foo.rkt"
> "bar.rkt")
>
>(module configure-runtime racket/base
>  (define-logger main)
>  (current-logger main-logger) ; sets `(current-logger)` early
>  )
>
>(require (submod "." configure-runtime))
>
> The `configure-runtime` submodule name is special: when "main.rkt" is
> run as a program, then `configure-runtime` is loaded and instantiated
> first --- before the result of "main.rkt", and before the imported
> "foo.rkt" and "bar.rkt" modules.
>
> This strategy only makes sense for configuration that is especially
> main-like, though. It doesn't compose for larger things that are built
> on "main.rkt".

Excellent, thanks!  This will work well for part of my program.  I
recently discovered submodules, but did not know about
configure-runtime.  One thing is missing from the pattern above:
(provide main-logger).

Thanks,
Aidan

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[racket] struct constructors

[Aidan Gauland]

Hello fellow racketeers,

What's the nearest equivalent for a struct to constructors for class
instances?  Say I have a struct with a field that should be initialised
to a three-element vector.  Right now, I'm just defining a wrapper
make-blah.

(struct blah (a b c v))

(define (make-blah)
  (blah 0 0 0 #(0 0 0))

This seems fine, but I see that there's a keyword argument to the
`struct' procedure #:constructor-name and I can't quite make sense of
what that does.  Is it a low-level thing, or is it exactly what I want?

Thanks,
Aidan Gauland


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[racket] struct constructors

[Aidan Gauland]

Hello fellow racketeers,

What's the nearest equivalent for a struct to constructors for class
instances?  Say I have a struct with a field that should be initialised
to a three-element vector.  Right now, I'm just defining a wrapper
make-blah.

(struct blah (a b c v))

(define (make-blah)
  (blah 0 0 0 #(0 0 0))

This seems fine, but I see that there's a keyword argument to the
`struct' procedure #:constructor-name and I can't quite make sense of
what that does.  Is it a low-level thing, or is it exactly what I want?

Thanks,
Aidan Gauland



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