Resolve issues using empty notebooks

.gitignore

@@ -3,3 +3,4 @@ dist/
 *.sh
 rice-box.go
 stick
+vendor/

goreleaser.yml

@@ -9,20 +9,20 @@ builds:
       pre: rice embed-go
       post: rm rice-box.go
     goos:
-      - darwin
-      - freebsd
+#      - darwin
+#      - freebsd
       - linux
       - windows
     goarch:
       - 386
       - amd64
-      - arm
-      - arm64
-      - ppc64
-      - ppc64le
-    goarm:
-      - 6
-      - 7
+#      - arm
+#      - arm64
+#      - ppc64
+#      - ppc64le
+#    goarm:
+#      - 6
+#      - 7
 archive:
   replacements:
     386: i386

main.go

@@ -5,8 +5,6 @@ import (
 	"log"
 	"math/rand"
 	"os"
-	"os/signal"
-	"syscall"
 	"time"
 
 	"github.com/pkg/errors"
@@ -105,24 +103,7 @@ func main() {
 					stick.Config.Serve = address
 				}
 
-				sigc := make(chan os.Signal, 1)
-				signal.Notify(sigc, syscall.SIGUSR1, syscall.SIGUSR2)
-				go func() {
-					for sig := range sigc {
-						switch sig {
-						case syscall.SIGUSR1:
-							// TODO: Reload config
-						case syscall.SIGUSR2:
-							log.Println("Compacting notebooks...")
-							stick.NotebooksLock.Lock()
-							for _, notebook := range stick.Notebooks {
-								notebook.Compact()
-							}
-							stick.NotebooksLock.Unlock()
-							log.Println("Compacted notebooks")
-						}
-					}
-				}()
+				registerSignalHandlers()
 
 				log.Printf("serving shared notebooks on %s", stick.Config.Serve)
 				serveWeb()

notebook.go

@@ -55,7 +55,9 @@ func (n *Notebook) getNote(id string) *Note {
 	r := n.Repository
 
 	ref, err := r.Head()
-	CheckError(err)
+	if err != nil {
+		return nil // Empty repository
+	}
 
 	cIter, err := r.Log(&git.LogOptions{From: ref.Hash(), Order: git.LogOrderCommitterTime, FileName: &file.Name})
 	CheckError(err)
@@ -181,7 +183,9 @@ func (n *Notebook) File(id string) *object.File {
 	var file *object.File
 
 	ref, err := n.Repository.Head()
-	CheckError(err)
+	if err != nil {
+		return nil // Empty repository
+	}
 
 	commit, err := n.Repository.CommitObject(ref.Hash())
 	CheckError(err)

platformall.go

@@ -0,0 +1,31 @@
+// +build !windows
+
+package main
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func registerSignalHandlers() {
+	sigc := make(chan os.Signal, 1)
+	signal.Notify(sigc, syscall.SIGUSR1, syscall.SIGUSR2)
+	go func() {
+		for sig := range sigc {
+			switch sig {
+			case syscall.SIGUSR1:
+				// TODO: Reload config
+			case syscall.SIGUSR2:
+				log.Println("Compacting notebooks...")
+				stick.NotebooksLock.Lock()
+				for _, notebook := range stick.Notebooks {
+					notebook.Compact()
+				}
+				stick.NotebooksLock.Unlock()
+				log.Println("Compacted notebooks")
+			}
+		}
+	}()
+}

platformwin.go

@@ -0,0 +1,5 @@
+// +build windows
+
+package main
+
+func registerSignalHandlers() {} // Unsupported

stick.go

@@ -1,7 +1,10 @@
 package main
 
 import (
+	"log"
 	"sync"
+
+	"github.com/pkg/errors"
 )
 
 type Stick struct {
@@ -43,7 +46,9 @@ func (s *Stick) loadNotebooks() {
 	stick.Notebooks = make(map[string]*Notebook)
 	for _, nbconfig := range stick.Config.Notebooks {
 		notebook, err := LoadNotebook(nbconfig.Repo)
-		CheckError(err)
+		if err != nil {
+			log.Fatal(errors.Wrapf(err, "failed to load %s", nbconfig.Repo))
+		}
 
 		notebook.ID = hash(nbconfig.Label)
 		notebook.Label = nbconfig.Label

web.go

@@ -372,34 +372,31 @@ func sendNotesSince(ss *StickSocket, modified int64) {
 	response["author"] = author.Name
 	response["notebooks"] = map[string]*ServedNotebook{}
 	for _, notebook := range author.Notebooks {
-		r := notebook.Repository
-		config, _ := notebook.Repository.Worktree()
-		_ = config
-
-		ref, err := r.Head()
-		CheckError(err)
-
-		commit, err := r.CommitObject(ref.Hash())
-		CheckError(err)
-
-		tree, err := commit.Tree()
-		CheckError(err)
-
 		snb := &ServedNotebook{Notebook: notebook, Notes: make(map[string]*Note)}
-		err = tree.Files().ForEach(func(f *object.File) error {
-			noteID := hash(f.Name)
-			note := notebook.getNote(noteID)
-			if note == nil || note.ModifiedAt < modified {
-				return nil
-			}
-			if note.ModifiedAt > newModified {
-				newModified = note.ModifiedAt
-			}
 
-			snb.Notes[noteID] = note
-			return nil
-		})
-		CheckError(err)
+		ref, err := notebook.Repository.Head()
+		if err == nil { // Non-empty repository
+			commit, err := notebook.Repository.CommitObject(ref.Hash())
+			CheckError(err)
+
+			tree, err := commit.Tree()
+			CheckError(err)
+
+			err = tree.Files().ForEach(func(f *object.File) error {
+				noteID := hash(f.Name)
+				note := notebook.getNote(noteID)
+				if note == nil || note.ModifiedAt < modified {
+					return nil
+				}
+				if note.ModifiedAt > newModified {
+					newModified = note.ModifiedAt
+				}
+
+				snb.Notes[noteID] = note
+				return nil
+			})
+			CheckError(err)
+		}
 
 		response["notebooks"].(map[string]*ServedNotebook)[snb.ID] = snb
 	}