patch_intercom_rails.rb

# When intercom javascript is excluded from HTML, any attempt to invoke `window.Intercom(...)` would
# result in runtime error. This patch introduces a callback into the controller, so that a shim can
# be inserted, when intercom javascript is excluded.
#
# Remove this patch and update your code if alternative at https://github.com/intercom/intercom-rails/pull/344
# is accepted.

spec = Bundler.definition.specs.find{|s| s.name == 'intercom-rails'}
if Gem::Dependency.new(spec.name, '> 0.4.2').match?(spec.name, spec.version)
  raise Gem::DependencyError, "Check that patch is still applicable for intercom-rails gem version #{spec.version}"
else
  module IntercomRails
    module AutoInclude
      module MethodPatch
        def intercom_rails_auto_include
          super

          # Callback to controller#after_intercom_rails_auto_include. Within callback,
          # instance variable @intercom_rails_include_javascript can be queried to know
          # if intercom javascript has been included or not.
          callback = :after_intercom_rails_auto_include
          send(callback) if respond_to?(callback, true)
        end
      end

      module Method
        prepend MethodPatch
      end

      module FilterPatch
        def include_javascript?
          controller.instance_variable_set(:@intercom_rails_include_javascript, super)
        end
      end

      class Filter
        prepend FilterPatch
      end
    end
  end
end