#racket on 2020-09-16 — irc logs at freenode.irclog.whitequark.org

2020-09-10 10:23 samth changed the topic of #racket to: Racket v7.8 has been released: https://blog.racket-lang.org/2020/08/racket-v7-8.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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03:42 <dustyweb> uh

03:43 <dustyweb> anyone mind try using racket's pict code form

03:43 <dustyweb> and evaluate

03:43 <dustyweb> > (code ($ foo))

03:43 <dustyweb> do you get a $ character or a pipe rendered?

03:43 <dustyweb> because I'm seeing a | here...

03:45 <dustyweb> huh strange, codeblock-pict seems ifne by contrast

03:46 <evdubs> i get a pipe

03:46 <evdubs> drracket 7.7

03:46 <dustyweb> evdubs: thanks

03:46 <dustyweb> me too

03:46 <evdubs> (code ($$ foo)) gives me $$

03:46 <dustyweb> strange stuff... I'll email the list I guess

03:46 * evdubs shrugs

03:47 <samth> dustyweb: https://docs.racket-lang.org/pict/More_Pict_Constructors.html?q=code#%28def._%28%28lib._pict%2Fcode..rkt%29._typeset-code%29%29

03:47 <rudybot> https://teensy.info/oSqyasDMUF

03:47 <samth> dustyweb: to quote: "$ — typesets as a vertical bar (for no particularly good reason)."

03:47 <dustyweb> samth: what

03:47 <dustyweb> so weird!

03:47 <dustyweb> but why though

03:47 <dustyweb> for no good reason I guess

03:48 <samth> it's hard to typeset a vertical bar

03:48 <samth> because it's an escape for symbols

03:48 <dustyweb> hm :( I don't suppose there's a way to force-insert a $ then?

03:48 <samth> that's not a good reason, but i'm pretty sure it's the reason

03:50 <samth> you might be able to escape and ((current-code-tt) "$")

03:50 <samth> i think that will work

03:51 <dustyweb> yeah it looks like I can do that

03:53 <dustyweb> thanks samth

03:53 <dustyweb> weird but nice to have a solution at least

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05:05 <RW21> Hello people, can I ask questions here?

05:06 <RW21> Why doesn't http://pasterack.org/pastes/15367 this evaluate?

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05:31 <dzoe> RW21: Yes.

05:31 <dzoe> RW21: Id does.

05:31 <dzoe> *It

05:31 <dzoe> The result is #<void>, of course.

05:32 <dzoe> See https://docs.racket-lang.org/reference/for.html?q=for#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._for%29%29 and https://docs.racket-lang.org/reference/strings.html?q=string-append#%28def._%28%28quote._~23~25kernel%29._string-append%29%29

05:32 <rudybot> https://teensy.info/uZ4z0CCWNG

05:32 <rudybot> https://teensy.info/PbL6NaroXF

05:34 <RW21> I think I get it now, I was thinking procedurally with the for loops :( I have to be careful of scopes.

05:34 <RW21> Thanks!

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06:08 <dzoe> Wow ... [229636.207753] Out of memory: Killed process 254281 (racket) total-vm:11288872kB, anon-rss:10529848kB, file-rss:0kB, shmem-rss:0kB, UID:1000 pgtables:20944kB oom_score_adj:0

06:08 <dzoe> During raco setup: 2 making: <pkgs>/web-server-lib/web-server

06:08 <dzoe> (building latest master)

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11:31 <dzoe> And another scribbling question - how to _easily_ include default values in proc-doc/names when these defaults might be platform-dependent (that is - the identifiers are provided by module being scribbled).

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18:37 <selimcan> oh, racket conf is in one month

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23:00 <countvajhula> i'm writing `cond` as a macro learning exercise, in terms of `if`, and this is what I've got so far:

23:00 <countvajhula> http://pasterack.org/pastes/95324

23:01 <countvajhula> it appears to work, but I'm not sure if it's right

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23:02 <countvajhula> in particular the `else` clause - i don't really understand why that works

23:05 <countvajhula> it feels like `else` there should be treated as just another named pattern, rather than `else` literally

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23:06 <countvajhula> as an experiment, i tried replacing the else clause pattern with `[(cond [else consequent]) #'(cond [#t consequent])] - this results in an infinite loop

23:12 <selimcan> spoiler alert

23:12 <selimcan> When you click on forms in DrRacket, there is a thing called 'Open defining file' :D

23:12 <countvajhula> if anything jumps out at anyone as to why the original macro (linked) works, and why the second version doesn't, i'm all ears :)

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