#####
#// This is an example of how to use Iowa to intelligently deliver specific
#// stylesheets based on some criteria.  Differences in how browsers implement
#// certain items sometimes mean that it is just easier to have two slightly
#// different stylesheets than to try to get everything to work identically
#// across all browsers with a single stylesheet.  This implementation is
#// simplistic, but even so, does seem to work alright in practice.
#//
#// This code will accomodate X different CSS files.  It auto reloads them
#// if they are changed, and caches them in memory for speedy delivery.
#####

class Styles < Iowa::Component
	begin
		MSIErxp
	rescue NameError
		MSIErxp = Regexp.new('MSIE')
	end

	def styles
		@styles_mtimes = {'styles.css' => 0, 'styles_mozilla.css' => 0} unless @styles_mtimes
		begin
			@style_data = ''
			if MSIErxp.match session.context.request.headers_in['User-Agent']
				style_file = 'styles.css'
			else
				style_file = 'styles_mozilla.css'
			end

			if File.stat(style_file).mtime.to_i > @styles_mtimes[style_file]
				File.open(style_file) {|fh| fh.each {|line| @style_data << line}}
				@styles_mtimes[style_file] = File.stat(style_file).mtime.to_i
			end
		rescue Exception => e
			# Maybe some sort of rudimentary hardcoded style?
		end
		@style_data
	end
end