Kemal controllers pattern

app.cr

# src/{{app_name}}.cr

require "kemal"
require "./controllers/*"
alias Env = HTTP::Server::Context # this could be provided by Kemal

module Main
  get "/", &->index(Env)
  get "/:name", &->greet(Env)
end

module Posts
  get "/posts/", &->index(Env)
  get "/posts/:id", &->show(Env)
end

Kemal.run

main_controller.cr

# src/controllers/main_controller.cr

module Main
  extend self

  def index(env)
    "main#index"
  end

  def greet(env)
    "Hello #{env.params.url["name"]}"
  end
end

posts_controller.cr

# src/controllers/posts_controller.cr

module Posts
  extend self

  def index(env)
    "posts#index"
  end

  def show(env)
    "posts#show:#{env.params.url["id"]}"
  end
end