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# frozen_string_literal: true
module ViewComponent
module PreviewActions
extend ActiveSupport::Concern
included do
prepend_view_path File.expand_path("../../../views", __dir__)
around_action :set_locale, only: :previews
before_action :require_local!, unless: :show_previews?
content_security_policy(false) if respond_to?(:content_security_policy)
end
def index
@previews = ViewComponent::Preview.all
@page_title = "Component Previews"
render "view_components/index", **determine_layout
end
def previews
find_preview
if params[:path] == @preview.preview_name
@page_title = "Component Previews for #{@preview.preview_name}"
render "view_components/previews", **determine_layout
else
prepend_application_view_paths
prepend_preview_examples_view_path
@example_name = File.basename(params[:path])
@render_args = @preview.render_args(@example_name, params: params.permit!)
layout = determine_layout(@render_args[:layout], prepend_views: false)[:layout]
locals = @render_args[:locals]
opts = {}
opts[:layout] = layout if layout.present? || layout == false
opts[:locals] = locals if locals.present?
render "view_components/preview", opts
end
end
private
# :doc:
def default_preview_layout
ViewComponent::Base.config.default_preview_layout
end
# :doc:
def show_previews?
ViewComponent::Base.config.show_previews
end
# :doc:
def find_preview
candidates = []
params[:path].to_s.scan(%r{/|$}) { candidates << Regexp.last_match.pre_match }
preview = candidates.detect { |candidate| ViewComponent::Preview.exists?(candidate) }
if preview
@preview = ViewComponent::Preview.find(preview)
else
raise AbstractController::ActionNotFound, "Component preview '#{params[:path]}' not found."
end
end
def set_locale(&block)
I18n.with_locale(params[:locale] || I18n.default_locale, &block)
end
# Returns either {} or {layout: value} depending on configuration
def determine_layout(layout_override = nil, prepend_views: true)
return {} unless defined?(Rails.root)
layout_declaration = {}
if !layout_override.nil?
# Allow component-level override, even if false (thus no layout rendered)
layout_declaration[:layout] = layout_override
elsif default_preview_layout.present?
layout_declaration[:layout] = default_preview_layout
end
prepend_application_view_paths if layout_declaration[:layout].present? && prepend_views
layout_declaration
end
def prepend_application_view_paths
prepend_view_path Rails.root.join("app/views") if defined?(Rails.root)
end
def prepend_preview_examples_view_path
prepend_view_path(ViewComponent::Base.preview_paths)
end
end
end
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