introduce matestack:core:component generator

This generator generates a matestack core component in app/concepts/matestack, a test file and a doc file.

Author: marcoroth

lib/generators/matestack/core/component/USAGE

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+Description:
+  This generates a matestack core component in app/concepts/matestack, a spec file and a docs file.
+
+  Pass the name of the component under_scored.
+
+Example 1:
+  `rails generate matestack:core:component NAME`
+
+  This will create:
+    app/concepts/matestack/ui/core/NAME/NAME.haml
+    app/concepts/matestack/ui/core/NAME/NAME.rb
+    spec/usage/components/NAME_spec.rb
+    docs/components/NAME.md
+
+  This will insert a link to the docs in:
+    docs/components/README.md

lib/generators/matestack/core/component/component_generator.rb

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+# frozen_string_literal: true
+
+module Matestack
+  module Core
+    module Generators
+      class ComponentGenerator < Rails::Generators::NamedBase
+        source_root File.expand_path('templates', __dir__)
+
+        def create_core_component
+          template 'app/concepts/matestack/ui/core/%file_name%/%file_name%.haml'
+          template 'app/concepts/matestack/ui/core/%file_name%/%file_name%.rb'
+          template 'spec/usage/components/%file_name%_spec.rb'
+          template 'docs/components/%file_name%.md'
+
+          inject_into_file 'docs/components/README.md', before: "\n## Dynamic Core Components\n" do <<~RUBY
+            - [#{file_name.underscore}](/docs/components/#{file_name.underscore}.md)
+          RUBY
+          end
+        end
+      end
+    end
+  end
+end

lib/generators/matestack/core/component/templates/app/concepts/matestack/ui/core/%file_name%/%file_name%.haml.tt

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+%<%= file_name.underscore %>{@tag_attributes}
+  - if options[:text].blank? && block_given?
+    = yield
+  - else
+    = options[:text]

lib/generators/matestack/core/component/templates/app/concepts/matestack/ui/core/%file_name%/%file_name%.rb.tt

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+module Matestack::Ui::Core::<%= file_name.camelcase %>
+  class <%= file_name.camelcase %> < Matestack::Ui::Core::Component::Static
+  end
+end

lib/generators/matestack/core/component/templates/docs/components/%file_name%.md.tt

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+# matestack core component: <%= file_name.camelcase %>
+
+Show [specs](/spec/usage/components/<%= file_name.underscore %>_spec.rb)
+
+The HTML `<<%= file_name.underscore %>>` tag implemented in ruby.
+
+## Parameters
+
+This component can take 2 optional configuration params and either yield content or display what gets passed to the `text` configuration param.
+
+#### # id (optional)
+Expects a string with all ids the `<<%= file_name.underscore %>>` should have.
+
+#### # class (optional)
+Expects a string with all classes the `<<%= file_name.underscore %>>` should have.
+
+## Example 1: Yield a given block
+
+```ruby
+<%= file_name.underscore %> id: 'foo', class: 'bar' do
+  plain '<%= file_name.camelcase %> example 1' # optional content
+end
+```
+
+returns
+
+```html
+<<%= file_name.underscore %> id="foo" class="bar">
+  <%= file_name.camelcase %> example 1
+</<%= file_name.underscore %>>
+```
+
+## Example 2: Render `options[:text]` param
+
+```ruby
+<%= file_name.underscore %> id: 'foo', class: 'bar', text: '<%= file_name.camelcase %> example 2'
+```
+
+returns
+
+```html
+<<%= file_name.underscore %> id="foo" class="bar">
+  <%= file_name.camelcase %> example 2
+</<%= file_name.underscore %>>

lib/generators/matestack/core/component/templates/spec/usage/components/%file_name%_spec.rb

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+require_relative '../../support/utils'
+include Utils
+
+describe '<%= file_name.camelcase %> component', type: :feature, js: true do
+  it 'Renders a simple and enhanced <%= file_name.underscore %> tag on a page' do
+    class ExamplePage < Matestack::Ui::Page
+      def response
+        components {
+          # Simple <%= file_name.underscore %>
+          <%= file_name.underscore %> text: 'Simple <%= file_name.underscore %> tag'
+
+          # Enhanced <%= file_name.underscore %>
+          <%= file_name.underscore %> id: 'my-id', class: 'my-class' do
+            plain 'Enhanced <%= file_name.underscore %> tag'
+          end
+        }
+      end
+    end
+
+    visit '/example'
+
+    static_output = page.html
+
+    expected_static_output = <<~HTML
+      <<%= file_name.underscore %>>Simple <%= file_name.underscore %> tag</<%= file_name.underscore %>>
+      <<%= file_name.underscore %> id="my-id" class="my-class">Enhanced <%= file_name.underscore %> tag</<%= file_name.underscore %>>
+    HTML
+
+    expect(stripped(static_output)).to include(stripped(expected_static_output))
+  end
+end

spec/dummy/docs/components/README.md

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+# Core Components
+
+matestack provides a wide set of core components, which enables you to easily build your UI.
+You can build your [own components](/docs/extend/custom_components.md) as well, either static or dynamic.
+
+## Static Core Components
+
+- [br](/docs/components/br.md)
+- [img](/docs/components/img.md)
+
+## Dynamic Core Components
+
+- [transition](/docs/components/transition.md)
+- [onclick](/docs/components/onclick.md)

spec/lib/generators/matestack/core/component/component_generator_spec.rb

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+# frozen_string_literal: true
+
+require 'generator_spec'
+require 'generators/matestack/core/component/component_generator'
+
+describe Matestack::Core::Generators::ComponentGenerator, type: :generator do
+  let(:dummy) { File.expand_path(File.join(__FILE__, '..', '..', '..', '..', '..', '..', 'dummy')) }
+  let(:dummy_copy) { File.expand_path(File.join(__FILE__, '..', '..', '..', '..', '..', '..', 'dummy_copy')) }
+
+  before :each do
+    FileUtils.cp_r dummy, dummy_copy
+  end
+
+  after :each do
+    FileUtils.rm_rf dummy
+    FileUtils.cp_r dummy_copy, dummy
+    FileUtils.rm_rf dummy_copy
+  end
+
+  destination Rails.root
+
+  it 'creates a core component' do
+    run_generator %w(div)
+
+    assert_file 'app/concepts/matestack/ui/core/div/div.rb', /module Matestack::Ui::Core::Div/
+    assert_file 'app/concepts/matestack/ui/core/div/div.rb', /class Div < Matestack::Ui::Core::Component::Static/
+
+    assert_file 'app/concepts/matestack/ui/core/div/div.haml', /%div{@tag_attributes}/
+
+    assert_file 'spec/usage/components/div_spec.rb', /describe 'Div component', type: :feature, js: true do/
+    assert_file 'spec/usage/components/div_spec.rb', /div text: 'Simple div tag'/
+    assert_file 'spec/usage/components/div_spec.rb', %r{<div>Simple div tag</div>}
+    assert_file 'spec/usage/components/div_spec.rb', /div id: 'my-id', class: 'my-class' do/
+    assert_file 'spec/usage/components/div_spec.rb', %r{<div id="my-id" class="my-class">Enhanced div tag</div>}
+
+    assert_file 'docs/components/div.md', /# matestack core component: Div/
+    assert_file 'docs/components/div.md', %r{Show \[specs\]\(/spec/usage/components/div_spec.rb\)}
+    assert_file 'docs/components/div.md', /The HTML `<div>` tag implemented in ruby./
+    assert_file 'docs/components/div.md', /Expects a string with all ids the `<div>` should have./
+    assert_file 'docs/components/div.md', /Expects a string with all classes the `<div>` should have./
+    assert_file 'docs/components/div.md', /div id: 'foo', class: 'bar' do/
+    assert_file 'docs/components/div.md', /div id: 'foo', class: 'bar', text: 'Div example 2'/
+    assert_file 'docs/components/div.md', /<div id="foo" class="bar">/
+
+    assert_file 'docs/components/README.md', %r{- \[div\]\(/docs/components/div.md\)}
+  end
+end