avoid adding draft mode more than once

services/clsi/app/coffee/CompileManager.coffee

@@ -42,14 +42,12 @@ module.exports = CompileManager =
 			logger.log project_id: request.project_id, user_id: request.user_id, time_taken: Date.now() - timer.start, "written files to disk"
 			timer.done()
 
-			# FIXME - for incremental compiles we don't want to inject this multiple times
 			injectDraftModeIfRequired = (callback) ->
 				if request.draft
 					DraftModeManager.injectDraftMode Path.join(compileDir, request.rootResourcePath), callback
 				else
 					callback()
 
-			# FIXME - for incremental compiles we may need to update output.tex every time
 			createTikzFileIfRequired = (callback) ->
 				if TikzManager.needsOutputFile(request.rootResourcePath, resourceList)
 					TikzManager.injectOutputFile compileDir, request.rootResourcePath, callback

services/clsi/app/coffee/DraftModeManager.coffee

@@ -5,6 +5,9 @@ module.exports = DraftModeManager =
 	injectDraftMode: (filename, callback = (error) ->) ->
 		fs.readFile filename, "utf8", (error, content) ->
 			return callback(error) if error?
+			# avoid adding draft mode more than once
+			if content?.indexOf("\\documentclass\[draft") >= 0
+				return callback()
 			modified_content = DraftModeManager._injectDraftOption content
 			logger.log {
 				content: content.slice(0,1024), # \documentclass is normally v near the top
@@ -18,4 +21,4 @@ module.exports = DraftModeManager =
 			# With existing options (must be first, otherwise both are applied)
 			.replace(/\\documentclass\[/g, "\\documentclass[draft,")
 			# Without existing options
-			.replace(/\\documentclass\{/g, "\\documentclass[draft]{")
+			.replace(/\\documentclass\{/g, "\\documentclass[draft]{")