store the resource list in a file

app/coffee/ResourceListManager.coffee

@@ -0,0 +1,24 @@
+Path = require "path"
+fs = require "fs"
+mkdirp = require "mkdirp"
+logger = require "logger-sharelatex"
+settings = require("settings-sharelatex")
+
+module.exports = ResourceListManager =
+
+	# This file is a list of the input files for the project, one per
+	# line, used to identify output files (i.e. files not on this list)
+	# when the incoming request is incremental.
+	RESOURCE_LIST_FILE: ".project-resource-list"
+
+	saveResourceList: (resources, basePath, callback = (error) ->) ->
+		resourceListFile = Path.join(basePath, @RESOURCE_LIST_FILE)
+		resourceList = (resource.path for resource in resources)
+		fs.writeFile resourceListFile, resourceList.join("\n"), callback
+
+	loadResourceList: (basePath, callback = (error) ->) ->
+		resourceListFile = Path.join(basePath, @RESOURCE_LIST_FILE)
+		fs.readFile resourceListFile, (err, resourceList) ->
+			return callback(err) if err?
+			resources = ({path: path} for path in resourceList?.toString()?.split("\n") or [])
+			callback(null, resources)