crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

Kent 'picat' Gruber

@picatz

I think macros themselves are already pretty powerful ( and confusing if you didn't write the macro ).

I'm personally in the camp of not over-using/abusing macros; and most of the code I've used them for has been for purely syntax sugar-look'n stuff because I like it when my code is pretty.

Matias Garcia Isaia

@mgarciaisaia

Actually the song goes like "- Hey, this language doesn't have #send. - No, but you can use macros should you need them"

Nick Franken

@fridgerator

lol

:musical_note:

Rubi

@codenoid

morning :sparkles:

what macro used for ? https://crystal-lang.org/docs/syntax_and_semantics/macros.html

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@FromIRC

<watzon> @codenoid: you're wondering what macros are for?

Rubi

@codenoid

iyas,

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@FromIRC

<KAsmic> Hi hi, has anyone used the libui bindings? I want to know what "AreaHandler" is, and how to call it?

Dru Jensen

@drujensen

@codenoid have you ever used the JSON.mapping macro? This is probably the best example of usng a macro. It allows you to specify which properties will be mapped in your .to_json method. https://github.com/crystal-lang/crystal/blob/e2a1389e8165fb097c785524337d7bb7b550a086/src/json/mapping.cr#L9

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@FromIRC

<watzon> @codenoid: basically the purpose of a macro is code generation. Macros generate Crystal code at compile time and insert that code into the AST

<watzon> That way you can dynamically create classes, methods, etc

Rubi

@codenoid

way you can dynamically create classes, methods, etc o, ok, thanks @drujensen @watzon

cevarief

@cevarief

@drujensen So this is heavily used in amber scaffolding generator?

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@FromIRC

<Groogy> Morning!

Rubi

@codenoid

hi,,

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@FromIRC

<txdv> good morning

Rubi

@codenoid

context.response.headers = "some value" # HTTP::Server am i wrong ?

Rubi

@codenoid

o, headers need an hash value, but what a simple way to use res.headers (all data inside res.headers) to response.headers

Romain Franceschini

@RomainFranceschini

hey guys, when I'll be able to drink in this magnificent cup? https://twitter.com/CrystalLanguage/status/855080421075406848

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<Groogy> I want to know as well

Bar Hofesh

@bararchy

Cool !

Akzhan Abdulin

@akzhan

Wow, )

Rubi

@codenoid

res.headers.each { |k, v| context.response.headers[k] = v }
context.response.print res.body

why context.response.print res.body doesnt give the output

Rubi

@codenoid

when i added after this line https://github.com/codenoid/lemmehand/blob/57433562fec2c7ee8aef118f5dd9b10a3bda1093/server.cr#L21

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<ShalokShalom> can i use {} instead of do/end

<ShalokShalom> while i saw no do at all until

<Groogy> yeah though they do have different lexical meanings

<Groogy> in what order they are evaluated etc.

<Groogy> https://crystal-lang.org/docs/syntax_and_semantics/blocks_and_procs.html

<Groogy> "The difference between using do ... end and { ... } is that do ... end binds to the left-most call, while { ... } binds to the right-most call:"

<ShalokShalom> thanks a lot

<ShalokShalom> is there something like a Ruby to Crystal converter?

BONNAURE Olivier

@solisoft

Hi there, does anyone is working with JWT ?

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@FromIRC

<oprypin> ShalokShalom, what brings you here?

Rubi

@codenoid

why ?

res.headers.each { |k, v| context.response.headers[k] = v }
context.response.print res.body # doesnt give me output, after first line code

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<ShalokShalom_> @oprypin: Rubys Syntax and Crystals Speed

Ghost

@ghost~55586c4815522ed4b3e08557

I can't remember why we can't use Threads directly in crystal? I know that fibers and channels are the way to go, but what's the issue with threads? IO? Scheduler (probably)? GC?

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<RX14> @bew all of the above

<Papierkorb> Even in the future you won't be using Threads directly.

<RX14> IO is an issue because it depends on the scheduler which isn't thread safe

<RX14> and GC needed tweaks too

Serdar Dogruyol - Sedo セド

@sdogruyol

@RX14 are you gonna distribute a staticaly built crystal with docker?

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@FromIRC

<RX14> what?

Serdar Dogruyol - Sedo セド

@sdogruyol

ugh wrong sentence

Rubi

@codenoid

eh, btw, can i make a portable app with crystal, how about os library and dependencies ?

Serdar Dogruyol - Sedo セド

@sdogruyol

i remember you talking about building a docker image for a statically linked crystal

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@FromIRC

<RX14> better

<RX14> building a statically compiled crystal distribution in docker

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