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/

Ghost

@ghost~55586c4815522ed4b3e08557

I don't get the use case of instance routes, but an idea of impl could be:

class MyApp < Kemal::Application
  get "/" do |env|
    "hello"
  end

  # `instance_routes` could be a macro that will define the `initialize_instance_routes` method
  instance_routes do # Here using `with .. yield`, the instance routes can be configured with another DSL (could be methods, .. whatever)
    get "/foo" do |env|
      "bar"
    end
  end
end
app = MyApp.new
app.initialize_instance_routes
app.run

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@FromIRC

<oprypin> removed really

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@FromIRC

<Groogy> mersenne twister random generation isn't that good though :⁠/

Johannes Müller

@straight-shoota

Well the initialize_instance_routes method is not part of the DSL, it could be any method defined in a custom application subclass.

Ghost

@ghost~55586c4815522ed4b3e08557

I like the idea of macro only for class scope though!

Johannes Müller

@straight-shoota

The use case is that you might want to optionally add routes depending on configuration values or some other decision run-time

Ghost

@ghost~55586c4815522ed4b3e08557

but in this case, you should have a Router object, that you configure via methods or sth like that

Johannes Müller

@straight-shoota

The router is configured through the application

get method would actually call route_handler.add_route("GET", path, &block)

Ghost

@ghost~55586c4815522ed4b3e08557

like:

class App < Kemal::Application
  def some_method
    router.setup do
      get "kjhj" ...
    end
  end
end

Johannes Müller

@straight-shoota

I think the idea is to put these abstractions away

Bar Hofesh

@bararchy

Is there a PDF creator in Crystal ?

Cris Ward

@crisward

Int24 in crystal anyone?

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@FromIRC

<oprypin> no

Yuri Vendruscolo da Silveira

@yvern

hello,
how can I get current working dir path (pwd) at run time?
basically I need to access other files that are going to be at the same folder, but if I either use "./file_name" or Dir.current+"/fie_name", crystal gets the path at compile time, and if I place this same folder anywhere else, it tries to look for those files at the dir I compiled it.
thanks!

Ghost

@ghost~55586c4815522ed4b3e08557

Dir.current should give you the runtime current working directory

Cris Ward

@crisward

Didn't think so...

Ghost

@ghost~55586c4815522ed4b3e08557

It calls internally getcwd which does just that

Peter Leitzen

@splattael

As Crystal 0.23.1 is out, is there a timeline to release 0.23.1 as a docker image on https://hub.docker.com/r/crystallang/crystal/?

Yuri Vendruscolo da Silveira

@yvern

I have compiled simply :

puts Dir.current

and I got:

Yuris-MacBook-Pro:~ yuri$ /Users/yuri/Desktop/test ; exit;
/Users/yuri

so even though I opened it from desktop, it gives me another path... ):

Ghost

@ghost~55586c4815522ed4b3e08557

Well, it gives you your current working directory, not the directory where the binary is. I can see in your prompt that you are in ~ which corresponds to your home, which is /Users/yuri.

The binary is in Desktop, but you launched it from your home directory

Yuri Vendruscolo da Silveira

@yvern

in that case, is there a way to get the dir where the binary is?

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@FromIRC

<oprypin> @yvendruscolo, it's File.dirname(PROGRAM_NAME)

<oprypin> or the notorious crystal-lang/crystal#4715

Yuri Vendruscolo da Silveira

@yvern

thanks guys!

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@FromIRC

<Papierkorb> Or simply https://crystal-lang.org/api/0.23.0/Process.html#executable_path-class-method

<Papierkorb> $PROGRAM_NAME can be changed, by the running program, or by the program executing it

<oprypin> sorry what

<oprypin> this is the better alternative, but i dont get your comment about PROGRAM_NAME

<Papierkorb> program name is the name, which doesn't have to be the name of the binary.

<oprypin> demonstrate

@marceloboeira

Hello Guys

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@FromIRC

<Papierkorb> See exec(3).

@marceloboeira

quick question, is it possible to get the real class/type of a object from a macro?

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@FromIRC

<oprypin> @marceloboeira, {{ @type }}

@marceloboeira

hmm, not sure. the type of a given parameter of a macro

macro foo(value)
      MyGenericClass({{value.class_name.id}}).new
end

foo("hello")

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@FromIRC

<oprypin> that's fair. @yvendruscolo, see Papierkorb's suggestion. File.dirname(Process.executable_path)

@marceloboeira

given "hello" I want to create MyGenericClass(String).new("hello")

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@FromIRC

<oprypin> @marceloboeira, macros deal only with literals

@marceloboeira

that's what I thought :/

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@FromIRC

<oprypin> that would hopefully be MyGenericClass.new({{value}})

<Papierkorb> @marceloboeira, that syntax should work fine without for this case: The generic type can be auto-deduced from the arguments given to #initialize

<oprypin> MyGenericClass(typeof({{value}})).new({{value}}) might work but is redundant

@marceloboeira

hmm

the typeof works!!1

thanks :)

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@FromIRC

<oprypin> @marceloboeira, yeah but pls dont ignore the part about not needing it

@marceloboeira

yes, I actually am experimenting the limits of the macros

it is nothing serious

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