Re: [racket-users] Equivalent of exec

[Kieron Hardy]

> started as a quick experiment with scsh a number of years ago,

I’m surprised no one has mentioned Rash so I will ... perhaps Rash will be a 
useful tool for you ...

https://docs.racket-lang.org/rash/

“2 Rash Guide ... Rash is a shell language embedded in Racket. “

https://rash-lang.org/

Cheers,

Kieron

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Re: [racket-users] Historical note.

[Kieron Hardy]

> On Nov 8, 2020, at 2:58 PM, Hendrik Boom  wrote:
> 
>> On Sun, Nov 08, 2020 at 12:47:11PM -0800, unlimitedscolobb wrote:
>> The idea of having structs whose fields contain functions has never occurred 
>> to me ...
> 
> Historical note:
> 
> I first encountered structures containing function in the source code for
> OS/360 way back in the late 60's.  In assembler.
> 
> -- hendrik
> 
Structures with fields containing functions has never occurred to me before, 
either, at least not in those terms.

However isn’t that exactly one of the key design principles behind how 
device-drivers are implemented and installed into an OS? And also how classes 
and objects were initially added to C as some pretty hairy #define macros and 
function pointers?

This design pattern insight would have been beneficial to me sooner - doh!

— Kieron

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Re: [racket-users] scribble: how to put a bar above text?

[Kieron Hardy]

FYI: As of Windows 10, you can install a full Linux distro in/on Windows. Here 
are the instructions:

https://docs.microsoft.com/en-us/windows/wsl/install-win10

> On Jun 16, 2020, at 11:39 AM, Jos Koot  wrote:
> 
> Hi,
> Thanks for your prompt reply.
> I’ll first look into Mathjax. It’s on github, so I suppose I can download it 
> without charges.
> Using head-extra seems straight forward, but I never used it before. I’ll see 
> what happens.
> I hope it works with the scribble HTML button in DrRacket, for it seems I do 
> not have the required software to use the scribble PDF button. (I tried to 
> download the required software, but it did not work. May be windows 10 poses 
> a problem (well, it always does). It would be nice to have Unix as a 
> subsystem within windows, but I don’t know whether or not that is possible.)
> Thanks again, Jos
>  
>  
> From: Stephen De Gabrielle
> Sent: 16 June 2020 19:02
> To: Jos Koot
> Cc: us...@racket-lang.org
> Subject: Re: [racket-users] scribble: how to put a bar above text?
>  
> Hi Jos
>  
> MathML support via the  tag is not good. 
>  
> I suspect the best option is to use Mathjax 
> https://www.mathjax.org/#gettingstarted
>  
> I think you use `head-extra`[1] to add the required script tags[2] to your 
> file. (not done this myself though so I'm not sure how)
>  
> [1] 
> https://docs.racket-lang.org/scribble/core.html#%28def._%28%28lib._scribble%2Fhtml-properties..rkt%29._head-extra%29%29
>  
> [2]
> https://polyfill.io/v3/polyfill.min.js?features=es6";>
>  src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js";>
>  
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Re: [racket-users] Re: Gracket format

[Kieron Hardy]

> 
>> What version of Windows?
>> 
> 
> MacOS 10.14.6 :)

Mac, huh? I didn’t know Gracket was needed there. Sorry, I’m no help.

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Re: [racket-users] Gracket format

[Kieron Hardy]

Hi Mark,

How are you starting your program? 

Are you launching Racket from a command line or launching by e.g. 
double-clicking an icon in the Windows window manager? 

What version of Windows?

Cheers,

Kieron

> On Aug 28, 2019, at 5:44 AM, Mark Bestley  wrote:
> 
> I am just learning racket using the real of Racket book.
> 
> However I am have problems wil file formats.
> My .rkt file has become gracket format but I have no images or any non 
> ascii/unicode text in it. This messes up version control and use of other 
> editors.
> 
> How can I force DrRacket not to corrupt the text file? and only change if I 
> add images?
> 
> The only odd thing I think I have done that might matter is Collapse 
> S-expression.
> 
> 
> --
> Mark
> 
> 
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Re: [racket-users] snake game

[Kieron Hardy]

The language you should be using is "Beginning Student with List Abbreviations".

> On Jan 24, 2019, at 4:33 AM, orenpa11  wrote:
> 
> Hi,
> when I removed the line
> #reader(lib "htdp-beginner-abbr-reader.ss" "lang")((modname snake-full) 
> (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor 
> repeating-decimal #f #t none #f (
> 
> And changed the  language to pretty big.
> I recived this error:
> Welcome to DrRacket, version 7.1 [3m].
> Language: Pretty Big; memory limit: 128 MB.
> . . check-expect: undefined;
>  cannot reference an identifier before its definition
> 
> Any idea ?
> 
> Thanks,
> Or
> 
> 
> 
> 
> 
>> On Wednesday, January 23, 2019 at 10:49:01 PM UTC+2, Kieron Hardy wrote:
>> It seems the metadata lines added by DrRacket (mentioned by John) are 
>> processed when the a source file is loaded into DrRacket (via the menu 
>> option File/Open), but are not processed if the source code is directly 
>> copied (e.g. from a browser window) into a DrRacket window and then executed 
>> with the 'Run' button.
>> 
>> The metadata includes a #reader directive, e.g.:
>> (#reader(lib "htdp-beginner-abbr-reader.ss" "lang")((modname snake-full) 
>> ...) 
>> 
>> This reader directive appears to be silently ignored by DrRacket when the 
>> source is 'Run', even though DrRacket shows "#reader" in red (as when an 
>> error is detected). The actions taken by DrRacket when 'Run' is pressed seem 
>> to depend on the settings in effect when the code is executed, which could 
>> be nothing, or throwing a confusing error. 
>> 
>> The solution for the original poster's issue is as John directs; remove the 
>> metadata (i.e. #reader directive) and manually set the language.
>> 
>> However, I feel that DrRacket should recognize and act on (and perhaps also 
>> remove/hide from view) the metadata if the metadata occurs as from a 
>> copy/paste directly into a DrRacket window (e.g. as from a URL). The current 
>> behaviour is, I think, a bug and a trap (perhaps showstopping) for a new 
>> user experimenting with Racket. 
>> 
>> Note that the Racket executable seems to process the metadata properly, 
>> understanding the language to use, etc.. so that the code behaves as 
>> intended.
>> 
>>> On Wed, Jan 23, 2019 at 12:32 PM K H  wrote:
>>> Hello Or,
>>> 
>>> The language is not "Pretty Big".
>>> 
>>> You should be using "Beginning Student with List Abbreviations".
>>> 
>>> The DrRacket metadata lines referred to by John set the correct language. 
>>> In your case you must have changed the language somehow. Or perhaps the 
>>> file needs to be saved before the metadata is acted upon.
>>> 
>>> HTH,
>>> 
>>> Kieron.
>>> 
>>> 
>>>> On Wed, Jan 23, 2019 at 12:17 PM 'John Clements' via Racket Users 
>>>>  wrote:
>>>> Interesting problem; your screenshot shows header text that should not 
>>>> appear in the window, which suggests to me that you copied and pasted the 
>>>> text from somewhere else into a buffer where the language level was 
>>>> already set. It looks to me like you should do the following:
>>>> 
>>>> 1) Delete the first three lines of the file.
>>>> 2) Set the language level to “beginner with list abbreviations”.
>>>> 3) Click “run”
>>>> 
>>>> John Clements
>>>> 
>>>> > On Jan 23, 2019, at 10:44 AM, orenpa11  wrote:
>>>> > 
>>>> > Hi David,
>>>> > Thanks for your swift response ,I simply do not know how to run this 
>>>> > program.
>>>> > I thought that when I press the run button I should see the snake GUI .
>>>> > 
>>>> > Maybe the language is not pretty big ?
>>>> > Thanks,
>>>> > Or
>>>> > 
>>>> > 
>>>> > On Wednesday, January 23, 2019 at 8:25:32 PM UTC+2, David K. Storrs 
>>>> > wrote:
>>>> > What happens when you run it?  Are you getting any error messages? 
>>>> > 
>>>> > On Wed, Jan 23, 2019 at 1:01 PM orenpa11  wrote: 
>>>> > > 
>>>> > > Hi 
>>>> > > I am trying to implemet this code of "snake game " 
>>>> > > https://course.ccs.neu.edu/csu211/code/snake-full.ss 
>>>> > > 
>>>> > > in DrR

[racket-users] Resubmitting PRs after build problems

[Kieron Hardy]

Hi all,

I have noticed that some recent PRs have failed the Travis CI build step
seemingly due to unrelated, perhaps infrastructure-y, problems. e.g. The PR
I submitted, via a Github edit that fixes a typo in a comment, failed the
tests on one target with a tcp-connect timeout error (errno=60).

Of course, only PRs that pass the build will be reviewed by others and then
possibly merged into the Racket source proper. And so, using the Github web
interface, I looked in vain for some option to "re-build" my stalled PR,
ending up accidentally closing the PR. When I reopened and resubmitted the
PR, the build proceeded and completed successfully (and the PR was then
merged, thanks Vincent).

Is there a better procedure (other than close/open/resubmit PR) to redo a
build that failed?

Is there some way to get a "build failed" message automatically sent to the
PR submitter? I only noticed that my PR's build had failed by looking on
Github manually, a step that others may not think to perform; I did a quick
look at some of the other PRs with build failures and see several with
similar issues to mine.

Cheers,

Kieron.

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[racket-users] error during prompt calculation: path->string: contract violation

[Kieron Hardy]

Hello all,

On Windows, I noticed that Racket's initialization file is incorrectly set
to %HOMEDIRVE%\%HOMEPATH%\.racketrc.rktl

$ grep 'WINDOWS_INIT_FILENAME' -r .
./racket-master/racket/src/gracket/grmain.c:#define WINDOWS_INIT_FILENAME
"%%HOMEDIRVE%%\\%%HOMEPATH%%\\gracketrc.rktl"
./racket-master/racket/src/racket/main.c:# define WINDOWS_INIT_FILENAME
"%%HOMEDIRVE%%\\%%HOMEPATH%%\\racketrc.rktl"
./racket-master/racket/src/racket/main.c:# define INIT_FILENAME
WINDOWS_INIT_FILENAME

(The correct location should of course be on %HOMEDRIVE%).

Having never used a Racket initialization file, I set about developing a
test case to demonstrate the error in code using for inspiration Greg
Hendershott's answer regarding interactive use of Racket on SO (see
https://stackoverflow.com/a/19876947/1689714).

I set %HOMEDRIVE%\%HOMEPATH%\.racketrc.rktl to (require xrepl), and was
surprised to see no issue with actually using definitions from xrepl after
starting the racket executable. I soon realized that as the "current drive"
was the same as %HOMEDRIVE% (i.e. 'C:') the failure to evaluate %HOMEDIRVE%
would not be noticed since %HOMEPATH% alone would be enough to locate the
file .racketrc.rktl.

So ... I copied the 'foo.rkt' test file, and changed the shell's current
directory, to 'D:\', launched the racket executable and got:

D:\>racket
Welcome to Racket v6.12.
> (enter! "foo.rkt")
; error during prompt calculation: path->string: contract violation
  expected: path?
  given: "d:\\foo.rkt"
[internal-error]>

This seems to be the result of another issue entirely unconnected to the
problem of locating the initialization file, and one I am not able to chase
any further at the moment. Should I submit an error report?

Cheers,

Kieron.

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Re: [racket-users] The Little Schemer, misprint?

[Kieron Hardy]

Thanks, Ben.

Of course you are right. I was somehow fixated and had lost the context.

Sorry for the noise.

> On Feb 25, 2017, at 9:34 AM, Ben Greenman <benjaminlgreen...@gmail.com> wrote:
> 
> The printed explanation is giving the meaning of the whole line (in the 
> context of the call to member) --- not just the meaning of the application 
> (null? lat)
> 
> Hope this helps
> 
> 
>> On Sat, Feb 25, 2017 at 11:17 AM, Kieron Hardy <kieron.ha...@gmail.com> 
>> wrote:
>> I'm going through The Little Schemer (Fourth Edition). On page 23 the first 
>> question posed asks:
>> What is the meaning of the line
>> 
>> ((null? lat) #f)
>> 
>> where
>> lat is (mashed potatoes and meat gravy) 
>> 
>> The printed explanation seems to be a misprint as it appears to be the 
>> answer to a different question:
>> (null? lat) asks if lat is the null list. If it is, the value is #f, since 
>> the atom meat was not found in lat. If not, we ask the next question. In 
>> this case, it is not null, so we ask the next question . 
>> 
>> Is the printed answer wrong, or am I missing something?
>> 
>> Cheers,
>> 
>> Kieron
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[racket-users] The Little Schemer, misprint?

[Kieron Hardy]

I'm going through The Little Schemer (Fourth Edition). On page 23 the first 
question posed asks:
What is the meaning of the line

((null? lat) #f)

where
lat is (mashed potatoes and meat gravy) 

The printed explanation seems to be a misprint as it appears to be the answer 
to a different question:
(null? lat) asks if lat is the null list. If it is, the value is #f, since the 
atom meat was not found in lat. If not, we ask the next question. In this case, 
it is not null, so we ask the next question . 

Is the printed answer wrong, or am I missing something?

Cheers,

Kieron

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[racket-users] Exception handling on cygwin/windows

[Kieron Hardy]

The code for 'signal handling' with racket at Rosetta Code:

#lang racket

(define now current-milliseconds)

(define start (now))

(with-handlers ([exn:break?
 (λ(x)
  (define elapsed (/ (- (now) start) 1000.))
   (displayln (~a "Total time: " elapsed)))])
  (for ([i (in-naturals)])
(displayln i)
(flush-output)
(sleep 0.5)))


(see https://rosettacode.org/wiki/Handle_a_signal#Racket)

works as expected on windows in a DOS command window at the command line:
i.e.The exception handler catches the 'interrupt' and 'terminate' (or is it
'quit'?) signals generated from pressing on the keyboard; 'ctrl-c' for
interrupt and 'break' for terminate/quit.

However: in a cygwin bash terminal window the program responds to 'ctrl-c'
by quitting racket silently, and responds to 'break' by quitting racket
after outputting the text 'Quit'

Note: I needed to add a (flush-output) to flush the output buffer which
seems to be necessary under cygwin, which without the flush only wrote to
the window when the output buffer filled.

Is the failure to call the correct exception handler caused by running
'Racket for Windows' under cygwin?

Do I need to install into cygwin a version of racket that was built by
cygwin?

Do I need to re-configure something in cygwin? (e.g. with tset?)

I did a little bit of a google and haven't found anything relevant.

Thanks for any insight.

Cheers,

Kieron.

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Re: [racket-users] Racket Shell

[Kieron Hardy]

I've been experimenting with 'shell/pipeline' on windows and post some
tests and example results here in case they are of use to others:
- basic examples demonstrating windows external commands,
- basic examples demonstrating windows internal commands with standard
cmd.shell,
- basic examples demonstrating windows internal commands with 'new'
powershell.cmd shell,
- a more complex example showing a command pipeline using powershell
commands to do sed-like and grep-like operations.

Cheers,

Kieron.



Examples using Windows external commands:

#lang racket/base

; windows-pipeline-1.rkt - basic windows commands with output to stdout and
stderr

(require shell/pipeline)

; run racket, do arithmetic
(run-pipeline '(racket -e "(+ 41 1)") )

; run java, get java version
(run-pipeline '(java -version) )

; run where, find location of windows where.exe on path
(run-pipeline '(where where) )

; run where, find location of windows cmd.exe on path
(run-pipeline '(where cmd) )

Example execution from Windows command prompt:

C:\home\racket\shell>racket windows-pipeline-1.rkt >
windows-pipeline-1.rkt.out 2>&1

C:\home\racket\shell>type windows-pipeline-1.rkt.out
42
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)
C:\Windows\System32\where.exe
C:\Windows\System32\cmd.exe
0
0
0
0


Examples using Windows internal commands, i.e. commands built-in to the
cmd.exe shell:


#lang racket/base

; windows-pipeline-2.rkt - basic windows internal (cmd.exe) commands with
output to stdout and stderr

(require shell/pipeline)

; note: run cmd.exe with /c switch to terminate cmd.exe after executing the
given command, i.e. terminate without needing to execute the 'exit' command

; run windows cmd.exe shell, run internal 'dir' command to get directory
listing of the root of C: drive
(run-pipeline '(cmd /c dir C:\\) )

; run windows cmd.exe shell, run internal 'set' command to the get a
complete listing of the environment variables and their values
(run-pipeline '(cmd /c set) )

; run windows cmd.exe shell, run internal 'echo' command to send arguments
to standard out
(run-pipeline '(cmd /c echo hello world) )

; run windows cmd.exe shell, run internal 'path' command to get the value
of the PATH environment variable
(run-pipeline '(cmd /c path) )

; run windows cmd.exe shell, run internal 'echo' command to get the value
of the PATH environment variable
(run-pipeline '(cmd /c echo %PATH%) )


Example execution from Windows command prompt:

C:\home\racket\shell>racket windows-pipeline-2.rkt >
windows-pipeline-2.rkt.out 2>&1

C:\home\racket\shell>type windows-pipeline-2.rkt.out

 Volume in drive C is Windows
 Volume Serial Number is 4A0E-59A3

 Directory of C:\

05/06/2016  10:53 PM  Analytics
07/06/2015  09:57 AM  Brother
09/14/2015  07:49 AM  cygwin64
01/08/2016  05:00 PM  data
11/04/2015  02:18 PM   321,531 DUMP38fa.tmp
09/20/2016  02:51 PM  home
12/22/2014  07:04 PM  Intel
07/02/2015  01:19 PM  OSGeo4W64
07/13/2009  09:20 PM  PerfLogs
08/28/2016  08:48 PM  Program Files
09/20/2016  09:21 AM  Program Files (x86)
09/09/2015  05:50 PM  Python27
11/12/2015  01:16 PM  Python27_64
08/29/2016  02:47 PM  SWSETUP
09/20/2016  09:02 AM  tools
06/19/2015  02:41 PM  Users
08/02/2015  02:12 PM  wamp
09/14/2016  11:48 AM  Windows
09/07/2016  07:35 PM42 windows-version.txt
   2 File(s)321,573 bytes
  17 Dir(s)  366,015,729,664 bytes free
ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\Kieron\AppData\Roaming
asl.log=Destination=file
CLASSPATH=.;C:\tools\apple\QuickTime\QTSystem\QTJava.zip
CommonProgramFiles=C:\Program Files (x86)\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
COMPUTERNAME=NIETZSCHE

...

hello world
PATH=C:\ProgramData\Oracle\Java\javapath;C:\tools\racket\racket32_6.5\Racket;C:\Program
Files (x86)\...

C:\ProgramData\Oracle\Java\javapath;C:\tools\racket\racket32_6.5\Racket;C:\Program
Files (x86)\...

0
0
0
0
0


Examples using Windows powershell shell:

#lang racket/base

; windows-pipeline-3.rkt - basic windows internal (powershell.exe) commands
with output to stdout and stderr

(require shell/pipeline)

; note: run powershell.exe with /Command switch to terminate powershell.exe
after executing the given command, i.e. terminate without needing to
execute the 'exit' command

; run windows external command 'where.exe', find location of windows
powershell.exe on path
(run-pipeline '(where powershell) )

; run windows powershell.exe shell, run internal 'echo' command to get the
value of the arguments to standard out
(run-pipeline '(powershell /Command "& {echo Hello World}") )

; run windows powershell.exe 

Re: [racket-users] Re: Running racket on a #lang-less module-less file?

[Kieron Hardy]

+1

Yes, specifying the language to use when interpreting some source, is best in 
the input source itself than in the reference to that source.

But why must it be one or the other, and not some sensible combination of both. 
e.g. If the #lang is absent from the source, look for and/or override the 
language to use with command line switches to the interpreter, with #lang 
racket (or racket/base or something else) as the default.

The only way Racket-created solutions can supplant the products created with 
medieval tools (and I'm thinking here of lex, yacc, and their ilk) is by 
ingesting the exact same input source files/streams that those other products 
ingest. Forcing a change to input source is an unnecessary, difficult, and 
often insurmountable hurdle. Evolving replacement Racket-built solutions in 
(one of the many) domains where Racket is ideal should be easy.

> On May 7, 2016, at 6:48 AM, Jay McCarthy  wrote:
> 
> +1
> 
>> On Fri, May 6, 2016 at 6:13 PM, Jack Firth  wrote:
>> 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 designing 
>> the language Racket-first, I wouldn't need this feature.
>> 
>> --
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> 
> 
> 
> -- 
> Jay McCarthy
> Associate Professor
> PLT @ CS @ UMass Lowell
> http://jeapostrophe.github.io
> 
>   "Wherefore, be not weary in well-doing,
>  for ye are laying the foundation of a great work.
> And out of small things proceedeth that which is great."
>  - D 64:33
> 
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