Add ability to load labels from single document

services/web/app/coffee/Features/Labels/LabelsController.coffee

@@ -12,3 +12,12 @@ module.exports = LabelsController =
 				logger.err {project_id, err}, "[LabelsController] error getting all labels from project"
 				return next(err)
 			res.json {projectId: project_id, labels: projectLabels}
+
+	getLabelsForDoc: (req, res, next) ->
+		project_id = req.params.Project_id
+		doc_id = req.params.doc_id
+		LabelsHandler.getLabelsForDoc project_id, doc_id, (err, docLabels) ->
+			if err?
+				logger.err {project_id, doc_id, err}, "[LabelsController] error getting labels from doc"
+				return next(err)
+			res.json {projectId: project_id, docId: doc_id, labels: docLabels}

services/web/app/coffee/Features/Labels/LabelsHandler.coffee

@@ -10,14 +10,32 @@ module.exports = LabelsHandler =
 		ProjectEntityHandler.getAllDocs projectId, (err, docs) ->
 			if err?
 				return callback(err)
-			LabelsHandler.extractLabelsFromDocs docs, (err, projectLabels) ->
+			LabelsHandler.extractLabelsFromProjectDocs docs, (err, projectLabels) ->
 				if err?
 					return callback(err)
 				callback(null, projectLabels)
 
-	extractLabelsFromDocs: (docs, callback=(err, projectLabels)->) ->
+	getLabelsForDoc: (projectId, docId, callback=(err, docLabels)->) ->
+		ProjectEntityHandler.getDoc projectId, docId, (err, lines, rev) ->
+			if err?
+				return callback(err)
+			LabelsHandler.extractLabelsFromDoc lines, (err, docLabels) ->
+				if err?
+					return callback(err)
+				callback(null, docLabels)
+
+	extractLabelsFromDoc: (lines, callback=(err, docLabels)->) ->
+		docLabels = []
+		for line in lines
+			re = LabelsHandler.labelCaptureRegex()
+			while (labelMatch = re.exec(line))
+				if labelMatch[1]
+					docLabels.push(labelMatch[1])
+		callback(null, docLabels)
+
+	extractLabelsFromProjectDocs: (docs, callback=(err, projectLabels)->) ->
 		projectLabels = {}  # docId => List[Label]
-		for docPath, doc of docs
+		for _docPath, doc of docs
 			docLabels = []
 			for line in doc.lines
 				re = LabelsHandler.labelCaptureRegex()

services/web/app/coffee/router.coffee

@@ -195,6 +195,7 @@ module.exports = class Router
 		webRouter.get  '/project/download/zip', AuthorizationMiddlewear.ensureUserCanReadMultipleProjects, ProjectDownloadsController.downloadMultipleProjects
 
 		webRouter.get '/project/:Project_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getAllLabels
+		webRouter.get '/project/:Project_id/:doc_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getLabelsForDoc
 
 		webRouter.get    '/tag', AuthenticationController.requireLogin(), TagsController.getAllTags
 		webRouter.post   '/tag', AuthenticationController.requireLogin(), TagsController.createTag