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

<Guest64> https://www.bookstack.cn/read/crystal-lang/syntax_and_semantics-macros.md i found this and things are starting to click together now. thanks again

Kirk Haines

@wyhaines

@guest64 -- I can give you a little example of the kinds of thing that I am talking about in a bit.

Kirk Haines

@wyhaines

@guest64 --

module MyProcs
   Proc1 = ->(arg0 : Int32, arg1 : Int32) { arg0 + arg1 }
end

module MyProcs
  Proc2 = ->(arg0 : String, arg1 : String) { arg0.to_i64 + arg1.to_i64 }
end

macro build_a_hash
  {%
    foo = {} of Nil => Nil
    MyProcs.constants.each do |const|
      foo[const.stringify] = "MyProcs::#{const.id}".id
    end
  %}

MyHash = {{ foo.stringify.id }}
end

build_a_hash

pp MyHash
pp typeof(MyHash)

You are still going to have problems with types, though, if you have a single hash that holds everything.

Try it and you will see what I mean.

George Dietrich

@Blacksmoke16

can you build a binary from input via stdin or something?

i.e. w/o needing a file

didactic-drunk

@didactic-drunk

This is an idea I'm playing with. Is it possible to translate "#{class}.{method}" to a fixed offset at compile time? Example:

@[Measure]
def foo
end

macro finished
  {% for meth in ... %}
    def {{meth...}}
      slot = {{ slot_for @type, meth.name }}
      Fiber.current.measurements[slot].measure do
        previous_def
      end
    end
  {% end %}
end

George Dietrich

@Blacksmoke16

so that the methods are created in a specific order?

Quinton Miller

@HertzDevil

something like https://play.crystal-lang.org/#/r/bj2m

however this index is the overload order not the declaration order

it's still unique though

Kirk Haines

@wyhaines

@Blacksmoke16

{{ system("cat") }}

STDIN is defined for macro code, but off the top of my head right now I don't know if there is a way to read from it with macro code currently.

j8r

@jrei:matrix.org

[m]

{{ read_file }}

I didn't read before on what you want to do, here is only a better snippet

didactic-drunk

@didactic-drunk

Is it possible to monkey patch IO::FileDescriptor#read? https://carc.in/#/r/bj7v

oprypin

@oprypin:matrix.org

[m]

why tho

didactic-drunk

@didactic-drunk

Measure wait time

From IRC (bridge bot)

@FromIRC

<xyhuvud> it should work to monkeypatch as long as you make certain the original is already loaded. file_descriptor should be loaded though

<xyhuvud> it works for me, but then I don't depend on previous_def.

didactic-drunk

@didactic-drunk

previous_def is the important part. require "socket" doesn't seem to help. Is this a load order problem or issue with modules? https://carc.in/#/r/bj8y

George Dietrich

@Blacksmoke16

IO doesn't implement unbuffered_read

FileDescriptor should because it includes the module, so it should deff have that method

wonder if it's because the method is coming from another module

in this case you'd prob want to use super

From IRC (bridge bot)

@FromIRC

<xyhuvud> FileDescriptor implements it by itself though

George Dietrich

@Blacksmoke16

it's implemented via the include Crystal::System::FileDescriptor

so ends up not being a redefinition

From IRC (bridge bot)

@FromIRC

<mikko> well this is a fun bug crystal-lang/crystal#2485

<mikko> my almost trivial code has been compiling for many minutes due to this line: StaticArray(Bool, 10_000).new(true)

George Dietrich

@Blacksmoke16

nice

is there a reason to have a 10k member static array tho?

From IRC (bridge bot)

@FromIRC

<mikko> i was just wanting to experiment with bitarray vs staticarray vs array

<mikko> trying to see what kind of performance i get with each

George Dietrich

@Blacksmoke16

fair enough

Kirk Haines

@wyhaines

I think that if you search the archives in here, you will find some other discussion of StaticArray and that compilation performance cost. I remember seeing it....a yearish-ish ago.

didactic-drunk

@didactic-drunk

@Blacksmoke16 super doesn't work. https://carc.in/#/r/bj9h

George Dietrich

@Blacksmoke16

welp

Quinton Miller

@HertzDevil

speaking of large arrays of constant data: https://github.com/crystal-lang/crystal/issues/4516#issuecomment-878762317

Lewis E. Bogan

@lebogan

@Blacksmoke16 and all who responded to my raspberry pi madness: I finally got 1.0 to compile on a model 4b with 4gb ram. Why? Why not. After setting al the environment stuff, it works like a charm. I did have to compile llvm-10 for the rpi which was 'painfull' - almost 10 hours! I kept notes if anyone is interested - I consolidated a lot of stuff from online plus community help. A big thanks to everyone

Crystal 1.0.0 ()

LLVM: 10.0.0
Default target: arm-unknown-linux-gnueabihf

Still missing the compile date, but it works along with shards 0.15.0.

Benjamin Wade

@RespiteSage

@lebogan Very cool! I'm glad you got it working.

Taupiqueur

@alexherbo2

I think I found a bug in File.match?

https://github.com/crystal-lang/crystal/blob/master/src/file.cr#:~:text=self.match?

File.match? accepts a String or Path as path, but match_single_pattern only accepts String

George Dietrich

@Blacksmoke16

im assuming you get compile time error if you try and use a Path

Taupiqueur

@alexherbo2

yep

it's how I discovered the bug

George Dietrich

@Blacksmoke16

prob just need to do path.to_s

didactic-drunk

@didactic-drunk

Def#args.splat is broken for def a(*, b = false)? https://carc.in/#/r/bjhj

8 replies

oprypin

@oprypin:matrix.org

[m]

even if you have *args it just comes up as args, so not sure if you'd be able to tell that arg is a splat. so think this could deff be improved a bit

that just points to it not being meant for this use case

George Dietrich

@Blacksmoke16

shouldnt you be able to construct the same def with the ASTNode representation of it? Which atm that's not possible

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