[racket-users] Automated method for making racket package installs consistent?

[primer]

If I have an an install with packages X and Y installed, and a second 
install with packages Y and Z installed, is there a way to use raco.exe or 
some such to get X, Y, and Z installed on both machines without having to 
figure out "by hand" which packages are missing from each install?

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Re: [racket-users] Clearer code in DrRacket?

[Sorawee Porncharoenwase]

>
> Looks interesting. Do you know any package of this type for DrRacket (or
> another program) that works semantically while you program? (not just as a
> checking tool like View Syntax)
>

I think it would be difficult.

Racket has macros, and it allows shadowing on anything. The attached image
shows how `(if 1 2 3)` is colored differently by Check Syntax due to the
interaction with macros and shadowing.

[image: Screen Shot 2020-10-10 at 10.07.00.png]

To identify which context `(if 1 2 3)` is in, you need to macro-expand the
program and then analyze the expanded program (this is exactly what the
Check Syntax button does). However, macro expansion could be very
expensive. Syntax highlighting on the other hand is supposed to be very
cheap and done immediately as you edit the program. I believe this is why
DrRacket doesn't support syntax highlighting that you described.

If you are OK with a delay (you type something and it's colored, say, 10
seconds later), I think it's possible to use the result from the online
Check Syntax, which macro-expands your program continuously in the
background, to color the program.

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Re: [racket-users] Clearer code in DrRacket?

[Adam El Mazouari]

Looks interesting. Do you know any package of this type for DrRacket (or
another program) that works semantically while you program? (not just as a
checking tool like View Syntax)

--Adam.

On Fri, Oct 9, 2020 at 7:48 PM Shu-Hung You 
wrote:

> Here is an example that provides different colors for some particular
> forms such as define, require, lambda etc. However, these forms
> ('keywords') are recognized literally by the lexer instead of
> semantically as in Check Syntax. Therefore it will classify
> non-keywords as keywords from time to time.
> https://github.com/shhyou/drracket-scheme-dark-green
>
> More color schemes can be found here:
> https://pkgd.racket-lang.org/pkgn/search?tags=colorscheme
>
> On Fri, Oct 9, 2020 at 9:12 AM Adam El Mazouari
>  wrote:
> >
> > An example is this:
> >
> > (define (square-all lst) (if (null? lst)
> >
> > '()
> > (cons (square (car lst))
> >
> > (square-all (cdr lst)
> >
> >
> > As you can see, you've got:
> >
> > methods included by default (define, cons)
> > booleans (null?)
> > user-introduced vars (lst)
> >
> > shown in the same color. It's really not clear. I'd like for them to be
> in different colors.
> >
> > --Adam.
> >
> > On Fri, Oct 9, 2020 at 3:35 PM Sam Tobin-Hochstadt 
> wrote:
> >>
> >> Can you give an example of which things you'd like to be different? We
> >> usually use "variable" and "identifier" for very similar meanings when
> >> discussing Racket, for example.
> >>
> >> Sam
> >>
> >> On Fri, Oct 9, 2020 at 8:16 AM Adam El Mazouari
> >>  wrote:
> >> >
> >> > Hello everyone.
> >> >
> >> > I've started using DrRacket a couple of weeks ago and I can't get
> used to the color theme. Variables, identifiers, methods, all of them are
> in blue. It's really unintuitive. Does anybody know a good plugin that
> differentiates these in a clear way for the human eye?
> >> >
> >> > Or, if you know something better than DrRacket in that regard, feel
> free to write down.
> >> >
> >> > Thanks in advance!
> >> >
> >> > Adam
> >> >
> >> > --
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>

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