Initial open source commit

app/coffee/ResourceWriter.coffee

@@ -0,0 +1,68 @@
+UrlCache = require "./UrlCache"
+Path = require "path"
+fs = require "fs"
+async = require "async"
+mkdirp = require "mkdirp"
+OutputFileFinder = require "./OutputFileFinder"
+Metrics = require "./Metrics"
+
+module.exports = ResourceWriter =
+	syncResourcesToDisk: (project_id, resources, basePath, callback = (error) ->) ->
+		@_removeExtraneousFiles resources, basePath, (error) =>
+			return callback(error) if error?
+			jobs = for resource in resources
+				do (resource) =>
+					(callback) => @_writeResourceToDisk(project_id, resource, basePath, callback)
+			async.series jobs, callback
+
+	_removeExtraneousFiles: (resources, basePath, _callback = (error) ->) ->
+		timer = new Metrics.Timer("unlink-output-files")
+		callback = (error) ->
+			timer.done()
+			_callback(error)
+
+		OutputFileFinder.findOutputFiles resources, basePath, (error, outputFiles) ->
+			return callback(error) if error?
+
+			jobs = []
+			for file in outputFiles or []
+				do (file) ->
+					path = file.path
+					should_delete = true
+					if path.match(/^output\./) or path.match(/\.aux$/)
+						should_delete = false
+					if path == "output.pdf" or path == "output.dvi" or path == "output.log"
+						should_delete = true
+					if should_delete
+						jobs.push (callback) -> ResourceWriter._deleteFileIfNotDirectory Path.join(basePath, path), callback
+
+			async.series jobs, callback
+
+	_deleteFileIfNotDirectory: (path, callback = (error) ->) ->
+		fs.stat path, (error, stat) ->
+			return callback(error) if error?
+			if stat.isFile()
+				fs.unlink path, callback
+			else
+				callback()
+
+	_writeResourceToDisk: (project_id, resource, basePath, callback = (error) ->) ->
+		path = Path.normalize(Path.join(basePath, resource.path))
+		if (path.slice(0, basePath.length) != basePath)
+			return callback new Error("resource path is outside root directory")
+
+		mkdirp Path.dirname(path), (error) ->
+			return callback(error) if error?
+			# TODO: Don't overwrite file if it hasn't been modified
+			if resource.url?
+				UrlCache.downloadUrlToFile(
+					project_id,
+					resource.url,
+					path,
+					resource.modified,
+					callback
+				)
+			else
+				fs.writeFile path, resource.content, callback
+
+