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require "active_support/descendants_tracker"
module ActionMailer
module Previews #:nodoc:
extend ActiveSupport::Concern
included do
# Set the location of mailer previews through app configuration:
#
# config.action_mailer.preview_path = "#{Rails.root}/lib/mailer_previews"
#
mattr_accessor :preview_path, instance_writer: false
# Enable or disable mailer previews through app configuration:
#
# config.action_mailer.show_previews = true
#
# Defaults to true for development environment
#
mattr_accessor :show_previews, instance_writer: false
# :nodoc:
mattr_accessor :preview_interceptors, instance_writer: false, default: [ActionMailer::InlinePreviewInterceptor]
end
module ClassMethods
# Register one or more Interceptors which will be called before mail is previewed.
def register_preview_interceptors(*interceptors)
interceptors.flatten.compact.each { |interceptor| register_preview_interceptor(interceptor) }
end
# Register an Interceptor which will be called before mail is previewed.
# Either a class or a string can be passed in as the Interceptor. If a
# string is passed in it will be <tt>constantize</tt>d.
def register_preview_interceptor(interceptor)
preview_interceptor = \
case interceptor
when String, Symbol
interceptor.to_s.camelize.constantize
else
interceptor
end
unless preview_interceptors.include?(preview_interceptor)
preview_interceptors << preview_interceptor
end
end
end
end
class Preview
extend ActiveSupport::DescendantsTracker
attr_reader :params
def initialize(params = {})
@params = params
end
class << self
# Returns all mailer preview classes.
def all
load_previews if descendants.empty?
descendants
end
# Returns the mail object for the given email name. The registered preview
# interceptors will be informed so that they can transform the message
# as they would if the mail was actually being delivered.
def call(email, params = {})
preview = new(params)
message = preview.public_send(email)
inform_preview_interceptors(message)
message
end
# Returns all of the available email previews.
def emails
public_instance_methods(false).map(&:to_s).sort
end
# Returns true if the email exists.
def email_exists?(email)
emails.include?(email)
end
# Returns true if the preview exists.
def exists?(preview)
all.any? { |p| p.preview_name == preview }
end
# Find a mailer preview by its underscored class name.
def find(preview)
all.find { |p| p.preview_name == preview }
end
# Returns the underscored name of the mailer preview without the suffix.
def preview_name
name.sub(/Preview$/, "").underscore
end
private
def load_previews
if preview_path
Dir["#{preview_path}/**/*_preview.rb"].each { |file| require_dependency file }
end
end
def preview_path
Base.preview_path
end
def show_previews
Base.show_previews
end
def inform_preview_interceptors(message)
Base.preview_interceptors.each do |interceptor|
interceptor.previewing_email(message)
end
end
end
end
end
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