I'd like to typeset some Javascript code in a way similar to what pict/code
allows, but the naive approach of (code someFunc(someArg, someOtherArg))
doesn't quite work because of the reader adding whitespace in various places.
pict/code seems to be purely oriented towards working with racket
Fantastic, thank you. Sidenote - I had to (require java-lexer) instead of
(require java/code) like the readme says.
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I find that 99% of the time when I'm using syntax parameters, I'm just using
them with make-rename-transformer to implement macro-dependent keyword-like
things, such as `aif` and `it`. So I made a small helper macro
syntax-parameterize-rename:
(syntax-parameterize-rename ([param #'foo]) ...)
Additionally if it were it's own lang extension, the tool using this
information wouldn't need to do the parsing. The reader could extract all the
;;; definitions into a submodule that the tool requires.
On Thursday, May 7, 2015 at 11:44:59 AM UTC-7, Matthew Flatt wrote:
I have no problem with
On Thursday, May 14, 2015 at 5:36:23 PM UTC-7, Matthew Flatt wrote:
Here are the results of a package build using the v6.2 release
candidate:
http://release-pkg-build.racket-lang.org.s3-website-us-west-2.amazonaws.com/
Compare to v6.1.1:
http://pkg-build.racket-lang.org/
For the
The DrRacket Check Syntax button colors syntax in a helpful way, particularly
the distinction it makes between required/language bindings and bindings
defined in the module. However, as soon as I type anything the coloring
disappears. This wouldn't be so bad if it reappeared the next time
On Sunday, July 5, 2015 at 4:51:22 PM UTC-7, Matthew Butterick wrote:
`raco test` will automatically test every .rkt and .scrbl file in a
directory. Suppose I make `#lang foo` and thus many of my test files end with
.foo. I would want all .foo files to be automatically tested as well. Is
This idea in general is very cool, so do let us (or at least me) know when
you've got a prototype working. I'm quite curious to see the inner workings.
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I've made some libraries to assist testing. One is for integration testing and
also making REST request simpler in general, and the other is for making mocks
of procedures and checking they're called with certain arguments. The packages
are named request
On Monday, August 17, 2015 at 9:07:15 AM UTC-7, Matthew Flatt wrote:
That's an especially basic mistake, and it slipped by because low-level
locks are rarely allocated in the run-time system. Place channels are
probably the simplest way to trigger new locks, but the test that
checks for leaks
On Monday, July 27, 2015 at 1:15:31 AM UTC-7, mazert wrote:
Le 27/07/2015 04:13, Jason Yeo a écrit :
Hi Everyone!
For anyone out there who finds IRC too daunting and difficult to use,
there's a slack team created just for racketlang at
http://racket.slack.com. Get invites to the team
I find it irritating when I have to repeatedly add various macros exported by
libraries to their proper group in the Indenting section of DrRacket's settings
so that they're properly formatted. Is there a way for a package's info.rkt to
specify default indentation preferences for it's macros
So the documentation says that (circle 100) produces a circle with radius 100.
However, (pict-width (circle 100)) produces 100 instead of 200, so apparently
it's a circle with diameter 100 and radius 50? Is this a misdocumented
function, or am I missing something embarrassingly obvious?
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On Monday, July 20, 2015 at 5:03:55 PM UTC-7, Jack Firth wrote:
I'm trying to create a way to automatically turn test cases into examples.
I'd like a macro that turns this:
(extract-expressions
(module+ test
(check-equal? (extract-expression (square 5)) 25)
(check-equal? (extract
Indeed it turns out I was missing something embarrassingly obvious. I was
looking at the docs for the 2htdp/image functions, but using the pict functions.
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On Saturday, July 18, 2015 at 7:30:42 PM UTC-7, Mianlai Zhou wrote:
Hi all,
I am wondering how to change the following code of a 2D circle into a 3D ball:
(require slideshow)
(colorize (filled-ellipse (* size 15) (* size 15)) red)
My intention is to make the picture look like a
I'm trying to create a way to automatically turn test cases into examples. I'd
like a macro that turns this:
(extract-expressions
(module+ test
(check-equal? (extract-expression (square 5)) 25)
(check-equal? (extract-expression (square -5)) 25))
(module+ doc
@defproc[(square [x
Perhaps it would have been better phrased as "Which do you prefer, #:keyword or
:keyword?" with options like "strongly prefer x", "prefer x", "indifferent",
"prefer y", "strongly prefer y", rather than two different 1-10 scales.
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On Tuesday, October 20, 2015 at 11:56:33 AM UTC-7, Tim Brown wrote:
> I'm not sure if I'd want to be able to arbitrarily change
> current-proxy-servers on the fly (something that has proven difficult,
> highlighted by the hoops I have to jump through in the tests). On the other
> hand it's
On Wednesday, November 4, 2015 at 8:14:42 AM UTC-8, erich wrote:
> Hi,
>
> I have a number of functions for computing raw distance measures and
> functions to compute their maxima for a given number of items, so to
> normalize them to [0,1] I provide this:
>
> (define (normalize/distance measure
I definitely like standard packages, but how will we avoid the problem of this
becoming just another threading macro package instead of an actual standard? I
also feel like something similar would be useful for anonymous functions, what
with curly-fn, rackjure, fancy-app, the cut and cute
On Wednesday, October 14, 2015 at 3:45:46 PM UTC-7, Neil Van Dyke wrote:
> Alex Knauth wrote on 10/14/2015 05:57 PM:
>
> >
> > It's not worth changing the default for all of racket just to avoid
> > putting #lang colon-kw racket at the top of a program.
> >
>
> I currently have the opposite
I agree about using the function form for flexibility. (Alliteration!) The
macro form should be optimized for simple cases, because macros by nature
are less flexible. If you have a complex case, write actual functions.
You'll spend less time wrangling the syntax system that way.
On Thu, Oct 8,
The more I think about it, the more I realize I really dislike specifying
the position of arguments in these anonymous function syntaxes. For
instance I would prefer this:
(λ (x y) (/ y x))
To this:
λ.(/ $.1 $.0)
In the common case, you won't need to flip any argument orders around. In
that
command-line-ext is indeed failing because of mischief, and I removed that
dependency the other day. jack-mock is failing due to attempting to require
`unstable/sequence`, I don't remember offhand which package that's in now.
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On Friday, September 4, 2015 at 4:51:43 AM UTC-7, Juan Francisco Cantero
Hurtado wrote:
> On 09/03/2015 08:07 AM, Jack Firth wrote:
> > I've attempted to compile from source in an alpine image, but with no
> > success. There's a bit too much arcane magic there for me to figure out
On Friday, September 4, 2015 at 8:23:14 AM UTC-7, Juan Francisco Cantero
Hurtado wrote:
> On 09/04/2015 04:59 PM, Jack Firth wrote:
> > On Friday, September 4, 2015 at 4:51:43 AM UTC-7, Juan Francisco Cantero
> > Hurtado wrote:
> >> On 09/03/2015 08:07 AM, Jack Firth wro
On Sunday, September 6, 2015 at 10:56:16 AM UTC-7, Juan Francisco Cantero
Hurtado wrote:
> On 09/06/2015 01:05 PM, Jack Firth wrote:
> > Alpine provides a glibc package, could I just swap out for that instead?
>
> No, they don't provide glibc:
> https://pkgs.alpinelinux.org/p
On Monday, September 7, 2015 at 12:49:11 AM UTC-7, daniel wrote:
> Yes, thanks for providing the images. I tested a bit and it worked very
> well. I like the idea of the "ONBUILD" images.
>
> Daniel.
Those are experimental at the moment, I may change the interface they use
sometime in the near
I've attempted to compile from source in an alpine image, but with no success.
There's a bit too much arcane magic there for me to figure out how to do that.
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I do a lot of Racket development in Docker, and it's a pretty big pain. There's
a handful of images on Docker Hub but they're pretty unmaintained, usually lag
behind a version or two, tend to be built off an unnecessarily large base image
like ubuntu, don't offer a snapshot build, and don't
On Saturday, September 5, 2015 at 2:54:42 PM UTC-7, Juan Francisco Cantero
Hurtado wrote:
> On 09/04/2015 10:32 PM, Jack Firth wrote:
> >>
> >> Virtualbox -> Linux -> Docker -> Alpine
> >> ^
> >>
> >> Which Linux dis
> Perhaps you could provide your Dockerfile etc. on Github so others could
> look into it and maybe give some hints.
I've got them up at https://github.com/jackfirth/racket-docker, and they're on
Docker Hub as https://hub.docker.com/r/jackfirth/racket/. Currently the images
are built off Debian
Has anyone implemented a RabbitMQ client in racket? Is anyone working on it and
partway there? I'm trying to set up a distributed task system like Celery in
Python which needs the workers to be in Racket.
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Absolutely fantastic! I wonder how often language designers implement features
useful to game developers because of their children.
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There's also the fancy-app, curly-fn, and afl packages for different ways of
writing anonymous functions (cut and cute from srfi/26 always seemed awkward to
me).
cut:
(cut map sqr <>)
fancy-app:
(map sqr _)
curly-fn
#{map sqr %}
afl:
#λ(map sqr %)
point-free doesn't give you special syntax
> This is an area in which there are probably too many options, but opinions
> are strong, and we have not standardized (yet). Feedback is welcome!
Speaking of which, there's also the `threading` package, which I really should
add the point-free version of ~> to.
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On Thursday, June 2, 2016 at 10:06:25 AM UTC-7, Matthew Butterick wrote:
> I have a solution to this problem — is it legit, or is there some slick
> Rackety technique I'm missing?
>
> I'm making a toy #lang interpreter for Basic, which allows variables to be
> created with an assignment
#%top provides fallback behavior at compile time, but only in expression
positions. I think what you want can be done by doing this:
- Under the hood, make variables immutable and have their values be boxes.
- Have (set! x:id expr) and (define x:id expr) both expand to (box-set! x
expr). This
Erm, set-box! not box-set! My bad.
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I'd probably prefer using a fold over explicit recursion. This gets easier if
you split your code into two steps - one that does just one level of lookup,
and one that does nested lookups. Additionally, I'd prefer list indexes rather
than pair lookup functions:
(define (data/ref s key)
(cond
I'd probably prefer using a fold over explicit recursion. This gets easier if
you split your code into two steps - one that does just one level of lookup,
and one that does nested lookups. Additionally, I'd prefer list indexes rather
than pair lookup functions:
(define (data/ref s key)
(cond
fetch-blueboxes-strs claims in its documentation it can get the text of a
Scribble bluebox, but I have no idea how to actually use it. Attempting to get
the bluebox content of "list-ref", the following all either fail or return #f:
(fetch-blueboxes-strs 'list-ref)
(fetch-blueboxes-strs
Ah hah! Thanks for that link Robby. The appropriate definition tag for list-ref
is '(def ('#%kernel list-ref)). Extracted this function for figuring out the
definition tag of an identifier in an installed module:
(define (find-definition-tag identifier)
(xref-binding->definition-tag
Samth's example doesn't work for me, even after raco setup -xl. I'm on version
6.3
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The Slack channel that mirrors the messages in the IRC hasn't seen any messages
in the last few days. I checked the archives and there are a few messages in
the Slack channel that didn't make it across the bridge into irc-land either.
Would whoever set up the bridge between the two be willing
That library is the old Planet one, Racket has a new package management system
and the mongodb package has been moved to it. Try running `raco pkg install
mongodb` at a terminal (or installing through DrRacket's GUI) and then
`(require mongodb)`. The package server
Slack's business model would be negatively affected by user data mining. They
operate on a "free for small hobbyist use, expensive for large corporate use".
Corporations do not like when you mine their data and are generally able to do
far more about it than average citizens. By default Slack's
I'd like to note that the bridge has been restored, and the wormhole is
functioning properly now.
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Out of idle curiosity: why `(define (topological-sort ...) (local ((define
(topological-sort ... done)) (topological-sort ... '())` rather than using a
local define and a different name like `topological-sort/accumulator`?
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Hey all, I've made some pretty significant changes to the racket Docker images:
1) 6.4 and 6.3 support (took long enough...)
2) Onbuild images for running and testing apps for every 6.x version,
additionally the onbuild images were changed to run "racket main.rkt" as their
command after doing a
I think compile-omit-paths only works in an info file for a collection, not a
package. So you'd have to put it in an info file in the samples/ directory and
tell it to exclude everything in that collection.
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Slack room shows no new messages since Tuesday, yet IRC archives state the room
is as active as ever. Messages from the slack side aren't crossing over to IRC
either.
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I'm writing some Typed Racket code that works with syntax objects, which
currently can't be converted to contracts since syntax chaperones aren't a
thing. As a result, if I want untyped racket users to use my library, I have to
`unsafe-provide` functions in my module.
However, all of my
On Friday, April 22, 2016 at 10:40:01 AM UTC-7, Ronie Uliana wrote:
> I like a lot this advice from Haskell:
>
> "... in Haskell it is not possible to alter objects, but there are many
> functions which return a somehow altered input object. This object should be
> the last parameter because
How are you running Scribble? The command line `scribble` program, DrRacket's
scribble plugin, or through `raco setup`?
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The documentation for syntax properties states that if a macro sets a syntax
property during expansion then instead of the expanded syntax having only the
set value, it has a cons tree containing that value and any previous values set
for that same property. As I understand it, this means it's
> In the same way that properties can now be attached as preserved or
> not, we could and an option for specifying whether properties are are
> propagated/merged or not. If it's useful, we could even allow a
> combining function to be associated with with either a property value
> or a property
I'm writing a series of macros that attach metadata using syntax properties
during expansion, and I'm attempting to write a #lang whose module-begin form
expands the module and then inspects the metadata attached. The problem I'm
getting is that local-expand seems to not "expand enough" - it
William's remark is spot on about my use-case. There exists a language that
wasn't initially designed with racket in mind, but could easily be a racket
#lang. To interop with code already written in this language, I wanted an easy
way to run files that don't have the #lang line. If I were
Suppose I have a file in some custom language, like #lang foo, but it omits the
#lang foo line. Is there a way I can run the racket command line program in a
way where it says "treat this file as if it starts with the line #lang foo"?
I'm having trouble parsing the "Running Racket or Gracket"
On Thursday, May 5, 2016 at 5:39:44 PM UTC-7, Matthew Flatt wrote:
> At Thu, 5 May 2016 17:32:20 -0700 (PDT), Jack Firth wrote:
> > Does that evaluate the file as if it were entered in a REPL?
>
> Yes.
What if I don't want REPL semantics, but I want behavior identical to if
On Thursday, May 5, 2016 at 5:28:06 PM UTC-7, Matthew Flatt wrote:
> At Thu, 5 May 2016 17:14:57 -0700 (PDT), Jack Firth wrote:
> > Suppose I have a file in some custom language, like #lang foo, but it omits
> > the #lang foo line. Is there a way I can run the racket command li
On Saturday, July 16, 2016 at 7:06:10 PM UTC-4, David K. Storrs wrote:
> So, if one should prefer functions, what is a good place to use
> macros? When people talk about why LISP/Scheme/Racket are the most
> powerful languages, they inevitably mention macros and continuations.
> What is a good
On Tuesday, July 12, 2016 at 8:20:55 PM UTC-7, m4burns wrote:
> Hi all,
>
> I remember this topic came up on the list a while back. I've made a
> Docker image of the latest Racket from alpine 3.3 with just musl libc. I
> had to monkey patch some Racket internals to get this working, so it
>
On Tuesday, July 12, 2016 at 2:36:24 PM UTC-7, Sam Tobin-Hochstadt wrote:
> Could this be an API like the one for tooltips? IOW, some sort of general
> warning with a message and a syntax location?
I'd just like to interject quickly and say that's what I'm working on for
RacketCon :)
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I've got a macro that extends function definition by letting the user rebind
some identifiers with different values, which are then only available in a
certain context. For the sake of simplicity suppose it looks like this:
(define/foo (func v ...)
#:bind [helper1 expr]
#:bind [helper2
On Thursday, July 14, 2016 at 10:28:07 PM UTC-7, mattap...@gmail.com wrote:
> On Friday, July 15, 2016 at 2:22:50 PM UTC+10, Jack Firth wrote:
> > I've got a macro that extends function definition by letting the user
> > rebind some identifiers with different values, whic
I've written a library for making test mocks, so that tests can verify they're
correctly calling dependencies without really calling them (for example, to
avoid IO in unit tests). It's available in the package catalog under the name
"mock", and a separate package with RackUnit checks for mocks
On Tuesday, January 31, 2017 at 11:25:31 AM UTC-8, Neil Van Dyke wrote:
> For the benefit of the tightwad people, packages could optionally
> include metadata about any docs and tests that can be stripped --
> anything nonessential to "run-only" the package. This metadata could be
> used by
Rather than splitting "core packages" from "community packages", what if we
used the package ring system? [1] We could establish a way for the Racket
community to bless packages with "ring zero" status, then provide a --catalog
argument to Scribble to lookup ring information in when deciding
Usually when this situation arises, the collection is divided as you suggest
into a `foo/base` module that has minimal dependencies and a small "kernel"
API, while various `foo/X` modules provide things that either are logically not
necessary in the base API or may trigger large dependencies.
I don't have enough stats experience to help with the details of your problem,
but I'd like to suggest adding a separate package that extends math/statistics.
You'll likely have an easier time developing and testing it, and you won't have
to worry about adding extra dependencies to the built in
Somewhat reductionally, anyone can write a Racket library that implements a
`#lang` with the semantics of any language on that list, so Racket therefore
supports all paradigms. This doesn't really say anything useful.
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That's not possible in Typed Racket, no. Type checking is after macro expansion
so type information doesn't even exist when your macro would expand.
However, hope is not lost. There is a new approach to typechecking with macros
outlined in the Types as Macros paper by Stephen Chang and Alex
I have a module that during its expansion calls a function defined by a
parameter.
I have a command line tool that would like to read a module path and
dynamic-require it with that parameter changed to implement tool-specific
behavior.
However, (parameterize ([param tool-func])
I'm not sure about how to do this with the DrRacket debugger, but you can use
`debug-repl`[1] from the `debug` package to basically set a breakpoint that
opens a REPL you can use to inspect variables in. This works in both DrRacket
and regular command line racket.
[1]
Right, but shell completion varies by shell implementaiton so I was hoping that
raco
would have some built-in completion script that racket installs, and that
script would
dispatch to some racket code that implements custom completion for a particular
command
I'd like to stick something like
If I have a `raco` command that I want to add command completion too, how can I
do that?
Ideally I'm looking for some way to tell raco to dispatch to a particular
function whenever
shell completion is requested for any uses of my raco command. If there is no
way to do this
right now, what would
On Thursday, September 22, 2016 at 10:55:11 AM UTC-7, Geoffrey Knauth wrote:
> I was using Racket's date. Then I found it was creating a local time when I
> needed UTC. So I started using moments from (require gregor). Now I'm trying
> to figure out how to get either a regular date from a
Your `syntax-rules` macro-defined macro uses the name "b", but that name is
already bound by the `syntax-case` step of `define-primitive`. So your
expansion looks like this:
(define-primitive (add a b c d) (print (+ a b c d)))
=>
(begin
(define add-property-table (make-hash))
(hash-set!
You could base64 encode the file bytes and stick that into a field in the JSON
you send. Why not just send the file directly though? For instance, instead of
sending this:
POST /somewhere
Content-Type: application/json
{
filename: "foo"
content:
So I'm reading a file in as code and expanding it, then looking for values in a
certain
syntax property that macros in the expanded code attach. This works fine for
prefab
structs, but I can't seem to get it to work with transparent structs. The issue
is that
the struct values can be extracted
I've thought about this as well, and I think a `-build` or a `-develop` package
makes the most sense. As an aside, if you wanted to you could even add some
Scribble docs to that package describing the implementation of your library and
where important bits of it are. That kind of documentation
/; \
> system error: No such file or directory; errno=2
> context...:
> standard-module-name-resolver
> [1]32658 exit 1 ./test.rkt
>
> What did I wrong here?
>
> Cheers
> Meino
>
> Jack Firth <jackhfi...@gmail.com> [16-10-30 06:08]:
> &
I would recommend adding `info.rkt` files to your projects so that your
projects are *themselves* packages. In these info files you can declare what
packages you depend on, so rather than manually installing dependencies one at
a time globally (and reinstalling when upgrading racket), you
On Monday, November 7, 2016 at 11:19:22 AM UTC-8, David K. Storrs wrote:
> Out of curiosity, why do you want this?
Some context: https://github.com/jackfirth/lens/issues/290
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HTTP headers are ASCII characters only (more accurately, ISO-8859-1 - slight
differences from ASCII). So your protobuf message stored in the header may get
bytes above the 127-character range of ASCII mangled. There's a few other
issues here:
1. You're including the protobuf serialization in a
This thread truly terrifies me when I think of any code I ever wrote that
worked with dates and times.
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If you'd still like to use yaml, I would like to quietly point out that each of
the following is a valid boolean value in yaml:
- true
- false
- yes
- no
- y
- n
- True
- False
- TRUE
- FALSE
- on
- off
- YES
- NO
... but it's not strictly case-insensitive, as yES is parsed as a string
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There's also the Gregor package
(https://docs.racket-lang.org/gregor/index.html?q=gregor), which gives a much
more comprehensive interface to dates and times. In particular, Gregor allows
you to specify an "offset resolver" for these sorts of time-holes.
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I'm assuming you intend to *use* the argument, in which case this is a trickier
macro to write than `thunk` because you have to make sure the macro respects
scope properly. If you wanted a function that accepts one argument and ignores
it, you can use `const`. Otherwise, you can implement a
You may need to call `(flush-output)` after printing to ensure the buffer is
flushed. The library racket/place/distributed provides some convenience
wrappers like printf/f and displayln/f which print and immediately flush the
output port.
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As an aside, I've written (define (rest-> arg result) (->* () #:rest (listof
arg) result)) enough times that it'd be nice if it was either in the
racket/contract library or a sugar/contract lib on the package server.
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I've added two new packages to the package catalog. The first, `compose-app`,
provides a
simple #%app macro for composing single-argument functions together:
> (require compose-app)
> (map (add1 .. string->number) (list "1" "2" "3"))
(list 2 3 4)
Optionally, you can use the package with
On Thursday, March 16, 2017 at 3:25:34 PM UTC-7, Dan Liebgold wrote:
> Is there a way to do minimal installs of packages? I imagine skipping any
> gui elements would cut down the dependencies quite a bit.
You can install a package in binary form with `raco pkg install --binary foo`,
which
On Thursday, July 6, 2017 at 2:53:43 AM UTC-7, Neil Van Dyke wrote:
> * Pretty similar alternative: user has a Racket file "my-foo", which is
> the immediate program the user runs. This file does a `(require foo)`,
> as well as a `(start-foo #:pref1 x #:pref2 y ...)`.
You may be interested in
I recently published `disposable`, an experimental package for safely handling
external resources.
Features:
- representation of a "disposable", a producer of values with external
resources that must be disposed
- safe handling of disposables for multiple usage patterns, including:
- for a
> Just to make sure I understood correctly: ‘msgpack’ is the umbrella module
> that users import, ‘msgpack/test/pack’ (and ‘unpack’) are the test modules
> that will be run for testing only. How about the directory structure? I like
> to keep all source files in a source directory (my original
A `define/delay` macro for this might be a good addition to `racket/promise`:
(define-simple-macro (define/delay id:id expr:expr)
(begin (define p (delay expr)) (define (id) (force p
(define/delay conf
(with-input-from-file "db.conf" read-json))
(conf) ;; forces promise
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