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Registry

By default, components can be called directly like Components::Card.call(title: "foo", body: "bar") which will return the desired HTML string.
If desired, you can create alias methods in order to avoid the class call syntax:
app/matestack/components/registry.rb
module Components::Registry
def card(text=nil, options=nil, &block)
Components::Card.call(text, options, &block)
end
#...
end
which then allows you to call the card component like card(title: "foo", body: "bar") if the above shown module is included properly.
As this is just a plain Ruby module, you need to include it in all contexts you want to use the alias method. It might be a good idea to create your own ApplicationPage, ApplicationComponent and ApplicationLayout as base classes for your pages, components ans layouts. In there, you include your component registry module(s) only once and have access to the alias methods in all child classes:
app/matestack/application_page.rb
class ApplicationPage < Matestack::Ui::Page
include Components::Registry
end
app/matestack/application_component.rb
class ApplicationComponent < Matestack::Ui::Component
include Components::Registry
end
app/matestack/application_layout.rb
class ApplicationLayout < Matestack::Ui::Layout
include Components::Registry
end