Add document cache

  - Must be explicitly activated

coffee/lib/set-express.coffee

@@ -37,6 +37,7 @@ set = (fs.readFileSync __dirname + '/set.js', 'utf8').toString()
 
 partialCache = {}
 templateCache = {}
+documentCache = {}
 
 includeRegEx = /\<!--\s*include\s+(\S+)\s*--\>/g
 
@@ -105,6 +106,25 @@ render = (template, data) ->
 
 	a = new Date()
 
+	#
+	# To use document cache, explicitly set it on by passing
+	#
+	# { …, __set: {cache: true} }
+	#
+	# as part of your data object.
+
+	useCache = (data['__set'] != undefined) && (data['__set']['cache'] == true)
+	
+	if useCache 
+		# Check if the document rendered with this data exists in the cache.
+		documentHash = crypto.createHash('md5').update("#{template}#{JSON.stringify(data)}").digest('hex')
+		cachedDocument = documentCache[documentHash]
+
+		if cachedDocument != undefined
+			console.log "Returning document from cache."
+			console.log "Took: #{(new Date() - a)}"
+			return cachedDocument
+
 	# Add partials to template
 	template = addPartials template
 
@@ -204,6 +224,10 @@ render = (template, data) ->
 		# Add the doctype to the top of the rest of the HTML
 		html = "#{doctypeHTML}#{html}"
 
+	if useCache
+		# Save the rendered document (for this data) in the cache.
+		documentCache[documentHash] = html
+
 	console.log "Took: #{(new Date() - a)} ms."
 
 	return html

coffee/routes/main.coffee

@@ -15,4 +15,4 @@ exports.route = (request, response) ->
 	meta = require('../../package.json')
 	version = meta.version
 
-	response.render 'main', {version: version}
+	response.render 'main', {version: version, __set:{cache: true}}

coffee/routes/partials.coffee

@@ -11,4 +11,9 @@
 ################################################################################
 
 exports.route = (request, response) ->
-    response.render 'partials', {title: 'Ind.ie Labs: Set: Partials'}
+	data = 
+		title: 'Ind.ie Labs: Set: Partials'
+		__set:
+			cache: true 	# Use the document cache
+
+	response.render 'partials', data

coffee/routes/readme.coffee

@@ -25,4 +25,6 @@ exports.route = (request, response) ->
 			data.title = 'Read me!'
 			data.readme = readme
 
+		data.__set.cache = true
+
 		response.render 'readme', data

coffee/routes/simple.coffee

@@ -37,6 +37,7 @@ exports.route = (request, response) ->
                 return 'https://' + value + '.ie'
             isSelected: (value) ->
                 return 'tab selected'
+        cache: true
     }
 
     response.render 'simple', data