app/views/devise/confirmations/new.html.haml
%h2 Resend confirmation instructions
= form_for(resource, as: resource_name, url: confirmation_path(resource_name), html: { method: :post }) do |f|
= devise_error_messages!
%div
= f.label :email
%br/
= f.email_field :email, autofocus: true,
value: (resource.pending_reconfirmation? ? resource.unconfirmed_email : resource.email)
%div= f.submit 'Resend confirmation instructions'
= render 'devise/shared/links'