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/

From IRC (bridge bot)

@FromIRC

<yxhuvud> passing a union type involving nil looks weird though, as I don't see how a method with &block can ever not get a block passed

<yxhuvud> the sub variants seems to be a jungle though, not going to dig deep into that now.

<postmodern> hmm .as() it isn't working expected a function type, not (Proc(String) | Proc(String, String) | Nil)

<postmodern> you are right about the | Nil, since i'm also using overloading for a method that accepts (pattern : String, replace : String) and (pattern : String, &block : Proc(String,String) | Proc(String))

<yxhuvud> any call without a block probably calls another of the 4711 different sub signatures

From IRC (bridge bot)

@FromIRC

<postmodern> ah it seems i can't do &@block : Proc(...)

<postmodern> hmm no, that's not it

Ali Naqvi

@naqvis

just found an interesting finding that Free Variables take precedence over No Type Restriction
https://carc.in/#/r/ccoc

From IRC (bridge bot)

@FromIRC

<postmodern> what does Error: expected block type to be a function type, not (Proc(String) | Proc(String, String)) exactly mean? I am trying to & pass a literal ->(match) { ... } object to a method's &block

<postmodern> oh wait, do i have to define override methods for each type of &block ?

<postmodern> hmm compiler gets confused by block argument arity if i do that

George Dietrich

@Blacksmoke16

can you make a playground link?

From IRC (bridge bot)

@FromIRC

<postmodern> will have to reduce my code down to a minimal example

Ali Naqvi

@naqvis

postmodern: you can’t type restrict block param with Proc union. You will have to define overload method

From IRC (bridge bot)

@FromIRC

<postmodern> @naqvis, i tried defining overrides, but then the compiler complained about block arity (giving 1, expected 0). do you have any advice for that?

Ali Naqvi

@naqvis

type restrict block param

def test(&block : Proc1)

def test(&block : Proc2)

block without type restriction is treated as arity 0

From IRC (bridge bot)

@FromIRC

<postmodern> i have things like (String -> String) for Proc1 and (-> String) for Proc2. Not sure if that's the proper syntax?

George Dietrich

@Blacksmoke16

the first yields and returns a string, the second doesnt yield anything but returns a string

From IRC (bridge bot)

@FromIRC

<postmodern> i should write up that self-contained example for carcin

Ali Naqvi

@naqvis

postmodern: https://carc.in/#/r/ccss

Mateusz Wieloch

@mateuszwieloch

Hey I'm trying to build a terminal UI that will have ability to choose between multiple options with arrow keys (something like in the image below). I'd appreciate advice where to start - what Crystal library provides needed functionality, whether to go low level like NCurses bindings or is there something providing it out of the box?

Ali Naqvi

@naqvis

take a look at https://github.com/crystal-term/prompt

Mateusz Wieloch

@mateuszwieloch

🙏🏻Thank you! Looks like it has what I need or at least what I can use as a starting point

Ali Naqvi

@naqvis

:thumbsup:

Ali Naqvi

@naqvis

Published wasmer-crystal WebAssembly runtime for Crystal

Vladislav Zarakovsky

@vlazar

:heart: Wow, that's so cool! So I can use any Rust libs compiled to WASM from Crystal now?

Ali Naqvi

@naqvis

thanks and yeah

:pray:

Vladislav Zarakovsky

@vlazar

A complete and mature WebAssembly runtime

Is "mature" part there about it being tested in prod?

Ali Naqvi

@naqvis

that applies to wasmer

Vladislav Zarakovsky

@vlazar

gotcha, thank you!

Ali Naqvi

@naqvis

:pray:

ddd

@Dan-Do

A silly question as I don't know wasm. Does it mean that we can run Crystal code in browser?

Ali Naqvi

@naqvis

no, you can't compile crystal code to wasm. But via this shard now you can run other wasm modules from Crystal

this shard embeds wasm runtime inside crystal

ddd

@Dan-Do

:thumbsup:

Vladislav Zarakovsky

@vlazar

which means if you miss something in Crystal shards you can check https://crates.io/categories/wasm or anything else that works when compiled to WASM

ddd

@Dan-Do

That's really valuable for the community :heart:

From IRC (bridge bot)

@FromIRC

<SamantazFox> Hmm, I have a weird bug. I'm investigation atm, but the general idea is that because of the decompression issues in HTTP::Client from stdlib

<SamantazFox> I did implement a decompression routine (iv-org/invidious#2623), but it raises the following exception "HTTP::Client::Response#body_io cannot be nil (NilAssertionError)" in some edge cases.

<SamantazFox> I've deployed that fix for a few days now, on bare metal Debian, without a problem. But we keep getting issue reports about it.

<SamantazFox> So I'm trying to figure out if the problem is due to docker, or some specific container.

ddd

@Dan-Do

Regarding the body_io, sometimes the client cannot parse the response. I have a monkey patch like this

class HTTP::Client::Response
  def self.from_io?(io, ignore_body = false, decompress = true, &block)
    line = io.gets(4096, chomp: true)
    return yield nil unless line

    pieces = line.split(3)
    if pieces.size < 2
      # return yield new status_code: 200, body_io: ChunkedContent.new(io)
      pieces = "HTTP/1.1 200 OK".split(3)
    end

    http_version = pieces[0]
    raise "Unsupported HTTP version: #{http_version}" unless HTTP::SUPPORTED_VERSIONS.includes?(http_version)
    status_code = pieces[1].to_i?
    unless status_code && 100 <= status_code < 1000
      raise "Invalid HTTP status code: #{pieces[1]}"
    end

    status = HTTP::Status.new(status_code)
    status_message = pieces[2]? ? pieces[2].chomp : ""
    body_type = HTTP::BodyType::OnDemand
    body_type = HTTP::BodyType::Mandatory if mandatory_body?(status)
    body_type = HTTP::BodyType::Prohibited if ignore_body
    HTTP.parse_headers_and_body(io, body_type: body_type, decompress: decompress) do |headers, body|
      return yield new status, nil, headers, status_message, http_version, body
    end
    nil
  end
end

The patch is

    if pieces.size < 2
      # return yield new status_code: 200, body_io: ChunkedContent.new(io)
      pieces = "HTTP/1.1 200 OK".split(3)
    end

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