Re: [racket-users] A language for command line interfaces

2021-07-24 Thread Siddhartha Kasivajhula 
That's great to hear, Sage. My initial thrust here was to just get the
syntax in place so that it worked the way it should, and I didn't give a
lot of attention to the supporting implementation beyond that it should
work correctly. I definitely see a possibility for big changes there and
maybe even an intermediary layer between cli and racket/cmdline which could
be natural-cli or something resembling it. I made some notes regarding the
existing implementation and possible next steps in this issue
. Happy to discuss further
and I appreciate your offer to collaborate.

On Sat, Jul 24, 2021 at 10:47 AM Sage Gerard  wrote:

> Thank you for doing this. CLIs are an interesting beast, and I should be
> available to contribute and/or comment next week.
>
>
> *~slg*
>
>
>
>
>
>
>  Original Message 
> On Jul 24, 2021, 1:14 PM, Siddhartha Kasivajhula < skasi...@gmail.com>
> wrote:
>
>
> Hello folks,
> If you ever have a need to write a command line script in Racket, you may
> be interested in the package I've just put up. Normally you'd write such
> scripts using Racket's built-in command-line
> 
>  or
> parse-command-line
> 
>  form.
> These offer a lot of functionality, but it takes time to learn how they
> work and the syntax is somewhat idiosyncratic. So, I've written a #lang
> that allows you to achieve the same functionality but with more familiar
> and extensible syntax, #lang cli
> .
>
> The language is composed of 5 forms - help, flag, constraint, program,
> and run. With these 5 forms, you get all of the functionality of the
> built-in parse-command-line form, and with syntax that's much simpler. In
> fact, the nontrivial forms of the language simply use Racket's normal
> function definition syntax, so there's very little to learn -- you
> basically write normal functions and they are implicitly wired to accept
> their inputs via the command line.
>
> At the moment, the functionality offered is at parity with the built-in
> forms, but there are some planned additions that would make it more
> powerful, including composable commands
> , generalized constraints
> , and argument schemas
> .
>
> So if you write command line scripts, I encourage you to give it a try.
>
> I also coincidentally came across the package natural-cli
>  by Sage Gerard.
> Looks like it provides some interesting features and in particular
> subcommands, which are absent in #lang cli. It very well may be that this
> package should be leveraged for semantics in #lang cli in the future (Sage
> if you'd like to add anything about what this package offers, please do).
>
> Enjoy,
> -Sid
>
> --
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> 
> .
>
>

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Re: [racket-users] A language for command line interfaces

2021-07-24 Thread Sage Gerard 
Thank you for doing this. CLIs are an interesting beast, and I should be 
available to contribute and/or comment next week.

~slg

 Original Message 
On Jul 24, 2021, 1:14 PM, Siddhartha Kasivajhula wrote:

> Hello folks,
> If you ever have a need to write a command line script in Racket, you may be 
> interested in the package I've just put up. Normally you'd write such scripts 
> using Racket's built-in 
> [command-line](https://docs.racket-lang.org/reference/Command-Line_Parsing.html#%28form._%28%28lib._racket%2Fcmdline..rkt%29._command-line%29%29)
>  or 
> [parse-command-line](https://docs.racket-lang.org/reference/Command-Line_Parsing.html#%28def._%28%28lib._racket%2Fcmdline..rkt%29._parse-command-line%29%29)
>  form. These offer a lot of functionality, but it takes time to learn how 
> they work and the syntax is somewhat idiosyncratic. So, I've written a #lang 
> that allows you to achieve the same functionality but with more familiar and 
> extensible syntax, [#lang cli](https://docs.racket-lang.org/cli/index.html).
>
> The language is composed of 5 forms - help, flag, constraint, program, and 
> run. With these 5 forms, you get all of the functionality of the built-in 
> parse-command-line form, and with syntax that's much simpler. In fact, the 
> nontrivial forms of the language simply use Racket's normal function 
> definition syntax, so there's very little to learn -- you basically write 
> normal functions and they are implicitly wired to accept their inputs via the 
> command line.
>
> At the moment, the functionality offered is at parity with the built-in 
> forms, but there are some planned additions that would make it more powerful, 
> including [composable 
> commands](https://github.com/countvajhula/cli/issues/3), [generalized 
> constraints](https://github.com/countvajhula/cli/issues/6), and [argument 
> schemas](https://github.com/countvajhula/cli/issues/7).
>
> So if you write command line scripts, I encourage you to give it a try.
>
> I also coincidentally came across the package 
> [natural-cli](https://docs.racket-lang.org/natural-cli/index.html) by Sage 
> Gerard. Looks like it provides some interesting features and in particular 
> subcommands, which are absent in #lang cli. It very well may be that this 
> package should be leveraged for semantics in #lang cli in the future (Sage if 
> you'd like to add anything about what this package offers, please do).
> Enjoy,
> -Sid
>
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> [https://groups.google.com/d/msgid/racket-users/CACQBWFnevJaRg61xLv6ayps-ihGpuUFUFEVbLTH7m929tpex3Q%40mail.gmail.com](https://groups.google.com/d/msgid/racket-users/CACQBWFnevJaRg61xLv6ayps-ihGpuUFUFEVbLTH7m929tpex3Q%40mail.gmail.com?utm_medium=email_source=footer).

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[racket-users] A language for command line interfaces

2021-07-24 Thread Siddhartha Kasivajhula 
Hello folks,
If you ever have a need to write a command line script in Racket, you may
be interested in the package I've just put up. Normally you'd write such
scripts using Racket's built-in command-line

or
parse-command-line

form.
These offer a lot of functionality, but it takes time to learn how they
work and the syntax is somewhat idiosyncratic. So, I've written a #lang
that allows you to achieve the same functionality but with more familiar
and extensible syntax, #lang cli
.

The language is composed of 5 forms - help, flag, constraint, program, and
run. With these 5 forms, you get all of the functionality of the built-in
parse-command-line form, and with syntax that's much simpler. In fact, the
nontrivial forms of the language simply use Racket's normal function
definition syntax, so there's very little to learn -- you basically write
normal functions and they are implicitly wired to accept their inputs via
the command line.

At the moment, the functionality offered is at parity with the built-in
forms, but there are some planned additions that would make it more
powerful, including composable commands
, generalized constraints
, and argument schemas
.

So if you write command line scripts, I encourage you to give it a try.

I also coincidentally came across the package natural-cli
 by Sage Gerard. Looks
like it provides some interesting features and in particular subcommands,
which are absent in #lang cli. It very well may be that this package should
be leveraged for semantics in #lang cli in the future (Sage if you'd like
to add anything about what this package offers, please do).

Enjoy,
-Sid

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[racket-users] Re: get-scaled-client-size and high-DPI on Windows

2021-07-24 Thread Ryan Kramer 
Wow, how did I write that much and not notice `get-client-size`, which is 
exactly what I want? The documentation is fine, apparently I just can't 
read today!

On Saturday, July 24, 2021 at 10:55:58 AM UTC-5 Ryan Kramer wrote:

> The following program looks "correct" when my Windows display scaling is 
> set to 100%, and looks "wrong" when set to anything higher than 100%. By 
> "correct" I mean that the 4 squares meet in the center of the canvas, 
> stretched to the maximum size possible that the canvas width and height 
> will allow.
>
> What is interesting is that I can make the program look correct by 
> immediately scaling the values returned from `get-scaled-client-size`. For 
> example, if my display is set to 150%, I can make the program look correct 
> by immediately multiplying the returned width and height by 2/3, because 
> 100% is 2/3 of 150%. But right now I have to hard-code the 2/3 factor. Is 
> there a way to get that 2/3 factor programmatically in Racket? Or (even 
> better), is there something else I should be calling instead of 
> `get-scaled-client-size` that would return the dimensions I want?
>
> This is Racket CS 8.0.0.11 on Windows. Let me know if you want 
> screenshots. Thanks in advance.
>
>
> #lang racket/gui
>
> (require pict)
>
> (define frame
>   (new frame%
>[label "Scale Test"]))
>
> (define (paint canvas dc)
>   (define-values (w h) (send canvas get-scaled-client-size))
>   (define-values (size x-offset y-offset)
> (if (> w h)
> (values h (/ (- w h) 2) 0)
> (values w 0 (/ (- h w) 2
>   (println (list w h size x-offset y-offset))
>   (for ([x (list x-offset (+ x-offset (/ size 2)))]
> #:when #t
> [y (list y-offset (+ y-offset (/ size 2)))])
> (send dc draw-rectangle x y (/ size 2) (/ size 2
>
> (define canvas
>   (new canvas%
>[parent frame]
>[paint-callback paint]))
>
> (send frame show #t)
>
>

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[racket-users] get-scaled-client-size and high-DPI on Windows

2021-07-24 Thread Ryan Kramer 
The following program looks "correct" when my Windows display scaling is 
set to 100%, and looks "wrong" when set to anything higher than 100%. By 
"correct" I mean that the 4 squares meet in the center of the canvas, 
stretched to the maximum size possible that the canvas width and height 
will allow.

What is interesting is that I can make the program look correct by 
immediately scaling the values returned from `get-scaled-client-size`. For 
example, if my display is set to 150%, I can make the program look correct 
by immediately multiplying the returned width and height by 2/3, because 
100% is 2/3 of 150%. But right now I have to hard-code the 2/3 factor. Is 
there a way to get that 2/3 factor programmatically in Racket? Or (even 
better), is there something else I should be calling instead of 
`get-scaled-client-size` that would return the dimensions I want?

This is Racket CS 8.0.0.11 on Windows. Let me know if you want screenshots. 
Thanks in advance.


#lang racket/gui

(require pict)

(define frame
  (new frame%
   [label "Scale Test"]))

(define (paint canvas dc)
  (define-values (w h) (send canvas get-scaled-client-size))
  (define-values (size x-offset y-offset)
(if (> w h)
(values h (/ (- w h) 2) 0)
(values w 0 (/ (- h w) 2
  (println (list w h size x-offset y-offset))
  (for ([x (list x-offset (+ x-offset (/ size 2)))]
#:when #t
[y (list y-offset (+ y-offset (/ size 2)))])
(send dc draw-rectangle x y (/ size 2) (/ size 2

(define canvas
  (new canvas%
   [parent frame]
   [paint-callback paint]))

(send frame show #t)

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