ChanServ changed the topic of #crystal-lang to: The Crystal programming language | | Crystal 0.21.1 | Fund Crystal's development: | Paste > 3 lines of text to | GH: | Docs: | API: | Logs:
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<FromGitter> <codingphasedotcom> What do you guys think I'm creating a new github project "ROCK" React Over Crystal & Kemal
<FromGitter> <fridgerator> Rock on
<FromGitter> <codingphasedotcom> Thnx
<FromGitter> <codingphasedotcom> Is there any good site or documentation for deploying Crystal app on heroku or digital ocean
<FromGitter> <jwoertink> @codingphasedotcom
<FromGitter> <jwoertink> I used this to get a kemal app up on heroku. Super easy
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<FromGitter> <elorest> @codingphasedotcom I’ve played a bit with Riot.js over Kemal.
<crystal-gh> [crystal] olbat opened pull request #4281: Fix: String#underscore with non-letter char #4278 (master...fix-string-underscore-with-numbers)
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<FromGitter> <sdogruyol> @codingphasedotcom rocky :D
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<FromGitter> <bew> nice name!
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<FromGitter> <CodelessFuture> Other then Heroku, where is possible to deploy web app?
<FromGitter> <CodelessFuture> I think any server like Linode and so on, right?
<FromGitter> <sdogruyol> anything
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<FromGitter> <bew> when redefining another stdlib for crystal, is there a way to easily change the default `require "something"` path ?
<FromGitter> <bew> and/or add more paths (via env variable maybe) ?
<FromGitter> <luislavena> @bew use `CRYSTAL_PATH` environment variable, a colon-separated list of relative/absolute paths is expected. see `crystal env` for default one.
<FromGitter> <bew> oh perfect, ty!
<FromGitter> <bew> I can't find in the doc, and don't remember where to search, what is the CR equivalent to a C NULL pointer?
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<FromGitter> <luislavena> That might be covered under C bindings section of the docs?
<FromGitter> <luislavena> There are mention of null for callbacks, but not null pointers under *callback* section
<FromGitter> <bew> I just went through all pages but can't found
<FromGitter> <luislavena> @bew check the `out` documentation, it describes how to pass a null pointer:
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<FromGitter> <bew> thx, finally I figured it out with: `Pointer(Int32).null`
<FromGitter> <bew> or simply `Pointer(Int32).new 0_u64`
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<FromGitter> <bew> I have another question tough: with `--prelude=empty` I still can't declare `Array` as a `struct`, it complains with: `Array is not a struct, it's a generic class`, any iea?
<FromGitter> <bew> idea*
<FromGitter> <bew> (I didn't found this error in the compiler sources :/)
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<FromGitter> <mjago> @bew array is included in prelude so maybe need your own mini prelude?
<FromGitter> <Sija> @bew see `src/compiler/crystal/semantic/`
<FromGitter> <bew> @mjago I used `--prelude=empty` so no array in this one, @Sija I'll look
<FromGitter> <Sija> IIRC `Array` and some other stdlib classes are defined internally by the compiler but I could be wrong
<FromGitter> <mjago> @bew oh I see - read your question wrong !
<FromGitter> <luislavena> @bew re: NULL pointer, you could have simply used `nil`:
<FromGitter> <mjago> @Sija @bew yes looks like Array is defined as a class but you can’t instantiate it (without prelude)
<FromGitter> <mjago> sorry I’m wrong - you can do a = Array(Int32).new without prelude
<FromGitter> <bew> yeah and I wonder why... where is it defined?
<FromGitter> <luislavena> @bew `src/compiler/crystal/`
<FromGitter> <bew> exactly, just found them myself, but ty
<FromGitter> <bew> 2 questions: 1/ What are `MetaVars` ? 2/ If I subclass `Program` and redefine `Program#initialize` I could redeclare all native types ?
<FromGitter> <bew> (2/ ... and make my own compiler, etc..)
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<FromGitter> <eliasjpr> Is there anyway to turn a string into a constant?"
<FromGitter> <eliasjpr> Something like "SomeClass" to SomeClass where I can call
<FromGitter> <sdogruyol> @eliasjpr you can do that with a macro
<FromGitter> <eliasjpr> okay, I guess I was approaching it the right way, I was wondering if there was a built in macro already
<FromGitter> <eliasjpr> ```code paste, see link``` []
<FromGitter> <bew> you can use `` and ``
<FromGitter> <eliasjpr> Awesome!
<FromGitter> <bew> see the docs for `Crystal::Macros::ASTNode#id` for reference
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<FromGitter> <bew> in macros, how to get the index of a char in a string literal ? `StringLiteral#index` does not exist..
<FromGitter> <bew> nvm I found a workaround with `StringLiteral#split`
<FromGitter> <eliasjpr> @bew thank reading the docs
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<FromGitter> <bew> @eliasjpr just for fun:
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<FromGitter> <bew> Arch package manager's last crystal version is 20.5 when 21.1 is out :(
<FromGitter> <chuckremes> @eliasjpr I’m starting to collect various metaprogramming tips on the wiki here:
<FromGitter> <chuckremes> I’m going to add your use-case and the solution that @bew wrote up.
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<FromGitter> <bew> oh a new wiki page! nice work
<crystal-gh> [crystal] MakeNowJust opened pull request #4283: pp: fixed to return value like 'p' (master...fix/pp/return-value)
<crystal-gh> [crystal] veelenga opened pull request #4284: Refresh zsh completion (master...feature/zsh_completion)
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<crystal-gh> [crystal] MakeNowJust opened pull request #4285: p: not display if no object is given (master...fix/p/empty-display)
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<FromGitter> <chuckremes> @bew I’ll be putting some work into it the next few days as I figure things out on my end. Really liking crystal but so much of what I do relies on lots of meta-magic. :)
<FromGitter> <bew> ahah! did you see the video (on vimeo iirc) on advanced macros ? I think you should add a link to it in you page as this is very important to not abuse macro (I can search for the link if you want)
<FromGitter> <bew> @chuckremes
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<FromGitter> <chuckremes> @bew If you have the link I’d love to see it.
<FromGitter> <bew>
<FromGitter> <bew> here it is ;)
<FromGitter> <chuckremes> Cool. Thank you.
<crystal-gh> [crystal] bcardiff pushed 1 new commit to master:
<crystal-gh> crystal/master b88c28f Vitalii Elenhaupt: Refresh zsh completion (#4284)
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<zipR4ND> hey all
<zipR4ND> a word: how to clone a class with circular dependencies?
<zipR4ND> class Test; @t : Test; end;
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<FromGitter> <elorest> Is there a way to use `crystal play` with codemirrors vim mode?
<FromGitter> <elorest> how blocks in crystal are different from ruby. despite reading the docs on blocks and procs a few times I don’t really understand the difference between {} and do end. I see that {} work in this case but do end don’t. I would I write my method that takes a block so that do end would work?
<FromGitter> <l3kn> seems like the second version is being interpreted as `puts(wrap_in_tags("title", "hello")) do |html| ...`
<FromGitter> <l3kn> I don't think there is anything wrong with your method
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<FromGitter> <g33kidd> Does crystal support something like this: `something, do: "hello"` ? If not, would it be possible to create a method that does allow this?
<FromGitter> <fridgerator> like a block?
<FromGitter> <fridgerator>
<ragmaanir> why does is_a? return an incorrect result here, is it because crystal still has problems with modules/generics?
<FromGitter> <phoffer> @elorest that code will exhibit the same problem in Ruby
<FromGitter> <phoffer> it is being interpreted differently with puts (which can cause funny things in ruby, not sure if crystal shares them)
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<BlaXpirit> zipR4ND, maybe you actually just want to use `dup`
<BlaXpirit> clone here would by definition always go into infinite recursion
<BlaXpirit> ragmaanir, looks like a bug to me, pls report
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<ragmaanir> k
<FromGitter> <elorest> Thanks guys.
<FromGitter> <bew> @elorest see for do/end {/} difference ;)
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