Fix for yunabe#58 - Adding support for loading startup files

jupyter/gojupyterscaffold/gojupyterscaffold.go

@@ -15,12 +15,18 @@ import (
 	"io/ioutil"
 	"os"
 	"os/signal"
+	"os/user"
+	"path"
+	"path/filepath"
+	"sort"
 	"syscall"
 
 	"github.com/golang/glog"
 	zmq "github.com/pebbe/zmq4"
 )
 
+const jupyterStartupDirectoryPath = ".jupyter/startup/"
+
 // ConnectionInfo stores the contents of the kernel connection file created by Jupyter.
 type connectionInfo struct {
 	StdinPort       int    `json:"stdin_port"`
@@ -123,6 +129,9 @@ func NewServer(connectionFile string, handlers RequestHandlers) (server *Server,
 	if err := hb.Bind(cinfo.getAddr(cinfo.HBPort)); err != nil {
 		return nil, fmt.Errorf("Failed to bind heartbeat socket: %v", err)
 	}
+
+	loadStartupScripts(execQueue, shell)
+
 	return &Server{
 		handlers:  handlers,
 		ctx:       serverCtx,
@@ -137,6 +146,46 @@ func NewServer(connectionFile string, handlers RequestHandlers) (server *Server,
 	}, nil
 }
 
+func loadStartupScripts(execQueue *executeQueue, shell *shellSocket) {
+	u, err := user.Current()
+	if err != nil {
+		glog.Errorf("Error while fetching current user directory: %v\n", err)
+		return
+	}
+
+	profileDirPath := path.Join(u.HomeDir, jupyterStartupDirectoryPath)
+	fileNames, err := ioutil.ReadDir(profileDirPath)
+	if err != nil {
+		glog.Errorf("Error while reading startup files from the profile directory: %v\n", err)
+		return
+	}
+
+	var files []string
+	for _, file := range fileNames {
+		if !file.IsDir() && filepath.Ext(file.Name()) == ".go" {
+			files = append(files, file.Name())
+		}
+	}
+
+	if files == nil || len(files) == 0 {
+		glog.Info("No startup files found, returning")
+		return
+	}
+
+	sort.Strings(files)
+	for _, file := range files {
+		code, err := ioutil.ReadFile(path.Join(profileDirPath, file))
+		if err != nil {
+			glog.Errorf("Error while loading startup file %s: %+v", file, err)
+			return
+		}
+
+		req := &message{Content: &ExecuteRequest{Code: string(code)}}
+		execQueue.queue <- &executeQueueItem{req, shell}
+		glog.Infof("Loaded %s\n", file)
+	}
+}
+
 // Context returns the context of the server
 func (s *Server) Context() context.Context {
 	return s.ctx