module Facades
module Helpers
##
#
# # Convenience helpers generally used in layout files
#
module Layout
##
# Returns a short-hand string identifying the current browser
#
def browser_name
uastr = request.user_agent.to_s
return "webkit" if uastr =~ /(webkit)[ \/]([\w.]+)/i
return "opera" if uastr =~ /(opera)(?:.*version)?[ \/]([\w.]+)/i
if matches = uastr.match(/(msie) ([\w.]+)/i)
version = (matches[2]||0).to_i
return "ie#{version}"
end
return "mozilla" if uastr =~ /(mozilla)(?:.*? rv:([\w.]+))?/i
"unknown"
end
##
#
# Allows easy assigning of meta tags from templates
# @param [Symbol] name Name of the meta tag (ie: keywords / description)
# @param [String] content The content to be used in the meta tag
# @return [String] A html meta tag with the name and content attributes set
#
def meta_tag(name, content = nil)
return _retrieve_variable(:"__#{name}") if content.nil?
content = tag(:meta, :name => name, :content => content)
_create_variable(:"__#{name}", content, false)
content
end
##
# Create a script tag for activating google analytics
# @param [String] site_id The site ID provided by google analytics
# @return [String] script tag
#
def google_analytics(site_id, &block)
return "" if defined?(Rails) && Rails.env != "production"
additional = capture(&block) if block_given?
additional ||= ""
content_tag(:script) do
%Q{
var _gaq = _gaq || [];
_gaq.push(['_setAccount', #{site_id}]);
_gaq.push(['_trackPageview']);
#{additional}
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
}
end.html_safe
end
##
#
# Creates a page id to be used for identifying a page for CSS/design purposes. If a variable
# is defined, it will be used. If not, one will be generated from the current controller/action.
#
# @param [String] content The string to be used as the page id.
# @return [String] The assigned page id
# @example Create a page_id and use it in the body tag
# <%= page_id('home') %>
#
# #=>
#
# @example Defaulting page id to controller/action
# # IndexController#home
# #=>
#
#
def page_id(content = nil)
_create_variable(:__page_id, content, false) and return if content
return _retrieve_variable(:__page_id) if content_for?(:__page_id)
result = if defined?(controller)
cname = controller.class.to_s.gsub(/controller$/i,'').underscore.split("/").join('_')
aname = controller.action_name
"#{cname}_#{aname}"
elsif defined?(request) && request.respond_to?(:path_info)
::File.basename(request.path_info).to_s
end
result
end
##
#
# Convenienve method to create a page title for the tag.
#
# @param [String] content The text for the page title
# @return [String] The provided content
# @example Set the page title from a view template
# <%= page_title('This is my page title') %>
#
# # In the layout:
# <%= page_title %> #=> This is my page title
#
def page_title(content = nil)
_create_variable(:__page_title, content, false) and return if content
return _retrieve_variable(:__page_title) if content_for?(:__page_title)
return ""
end
##
#
# Convenience method for content_for allowing for single-line variable creation. Also defines a method that can be
# re-used within a template.
#
# @param [Symbol] var_name The name of the variable to create
# @param [String] content The content that variable defines
# @return [String] An empty string. Use the newly created method from +var_name+ to return the value
#
# @example Setting a "page_class" variable
# <% set_var(:page_class, 'cool') %>
# <%= page_class %> #=> 'cool'
#
#
def set_var(var_name, content)
_create_variable("#{var_name}", content) and return ''
end
##
#
# Configures a "robots" meta tag based on the rails environment. In environments other than 'production'
# it sets the value to "noindex, nofollow" for each page that uses the layout in which it is called. This
# helps prevent spiders from crawling / indexing content when used on staging sites.
#
# @return [String] A html meta tag for "robots" with the appropriate content attribute set
#
def robot_meta_tag
tag(:meta, :name => 'robots', :content => (Rails.env.eql?('production') ? 'index, follow' : 'noindex, nofollow'))
end
private
def _create_variable(var, content, create_method = true) #:nodoc:
content_for(var.to_sym, content)
return '' unless create_method
class_eval <<-MAKE_VAR, __FILE__, __LINE__ + 1
def #{var}
content_for(:#{var})
end
public :#{var}
MAKE_VAR
end
def _retrieve_variable(var) #:nodoc:
(content_for?(var.to_sym) ? content_for(var.to_sym) : "")
end
end
end
end