dry-view ERB capture syntax example

app.rb

# frozen_string_literal: true

require "dry/view"

module Test
  class ControllerScope < Dry::View::Scope
    class Form
      def initialize(resource)
        @resource = resource
        @html = ""
      end

      def label(name)
        @html += %(<label for="#{@resource}-#{name}">#{name.capitalize}</label>\n)
      end

      def text_field(name)
        @html += %(<input type="text" id="#{@resource}-#{name}" name="#{@resource}[#{name}]">\n)
      end

      def submit(text)
        @html += %(<input type="submit" value="#{text}">\n)
      end

      def to_s
        %(<form id="new-#{@resource}" method="POST">\n#{@html}</form>\n)
      end
    end

    def form_for(name)
      Form.new(name).tap do |f|
        yield f
      end
    end
  end
end

Base = Class.new(Dry::View::Controller) do
  configure do |config|
    config.paths = Dir.pwd
  end
end

vc = Class.new(Base) do
  configure do |config|
    config.scope = Test::ControllerScope
    config.template = "new"
  end
end.new

puts vc.call.to_s

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

gem "dry-view", git: "https://github.com/dry-rb/dry-view.git", branch: "erb-support"
gem "erbse"

Gemfile.lock

GIT
  remote: https://github.com/dry-rb/dry-view.git
  revision: 861571f51638d18a362ce1923e11fce1f2ce0de0
  branch: erb-support
  specs:
    dry-view (0.5.4)
      dry-configurable (~> 0.1)
      dry-core (~> 0.2)
      dry-equalizer (~> 0.2)
      dry-inflector (~> 0.1)
      tilt (~> 2.0, >= 2.0.6)

GEM
  remote: https://rubygems.org/
  specs:
    concurrent-ruby (1.1.4)
    dry-configurable (0.7.0)
      concurrent-ruby (~> 1.0)
    dry-core (0.4.7)
      concurrent-ruby (~> 1.0)
    dry-equalizer (0.2.1)
    dry-inflector (0.1.2)
    erbse (0.1.3)
      temple
    temple (0.8.0)
    tilt (2.0.9)

PLATFORMS
  ruby

DEPENDENCIES
  dry-view!
  erbse

BUNDLED WITH
   1.17.3

new.html.erb

<h1>New Book</h1>

<div>
  <%= form_for(:book) do |f| %>
    <div>
      <%= f.label :title %>
      <%= f.text_field :title %>
    </div>

    <div>
      <%= f.submit "Create" %>
    </div>
  <% end %>
</div>

Output

<h1>New Book!</h1>

<div>
  <form id="new-book" method="POST">
<label for="book-title">Title</label>
<input type="text" id="book-title" name="book[title]">
<input type="submit" value="Create">
</form>
</div>