Create page for new editor when missing

file.go

@@ -100,14 +100,14 @@ func saveWithGit(fp *FilePages, p string, summary, author string) error {
 	cmd.Dir = fp.dirname
 	err := cmd.Run()
 	if err != nil {
-		return fmt.Errorf("while adding page %s: %s", p, err)
+		return fmt.Errorf("while adding page %s: %w", p, err)
 	}
 
 	cmd = exec.Command("git", "commit", "-m", "Changes to "+p+" by "+author+"\n\n"+summary)
 	cmd.Dir = fp.dirname
 	err = cmd.Run()
 	if err != nil {
-		return fmt.Errorf("while commiting page %s: %s", p, err)
+		return fmt.Errorf("while commiting page %s: %w", p, err)
 	}
 	return nil
 }

main.go

@@ -18,6 +18,10 @@ import (
 	"p83.nl/go/indieauth"
 )
 
+func init() {
+	log.SetFlags(log.Lshortfile)
+}
+
 var (
 	mp PagesRepository
 )
@@ -348,7 +352,13 @@ func (h *editHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	mpPage := mp.Get(page)
 	pageText := mpPage.Content
 
-	jsonEditor := pageText != "" && (pageText[0] == '{' || pageText[0] == '[')
+	if pageText == "" {
+		pageText = "[]"
+	}
+
+	var rawMsg json.RawMessage
+	err = json.NewDecoder(strings.NewReader(pageText)).Decode(&rawMsg)
+	jsonEditor := pageText != "" && err == nil
 
 	var editor template.HTML
 	if jsonEditor {
@@ -419,10 +429,15 @@ func (h *indexHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	jsonPage := pageText != "" && (pageText[0] == '[' || pageText[0] == '{')
-	if jsonPage {
-		//pageText, err = renderJSON(pageText)
+	if pageText == "" {
+		pageText = "[]"
+	}
 
+	var rawMsg json.RawMessage
+	err = json.NewDecoder(strings.NewReader(pageText)).Decode(&rawMsg)
+
+	jsonPage := pageText != "" && err == nil
+	if jsonPage {
 		var listItems []struct {
 			Id       int
 			Indented int