solve some back end bugs

Former-commit-id: de26609879e875b21de329588ecd1dcb44d152f3 [formerly 78b120bf0d33345808a422980db55d33c52304b7] [formerly d77c47bb41c1a7bf6ee2b2522bf7c86638d087bc [formerly 2819ab24b85a578dc1f572f1e64eccc98cabd6c3]]
Former-commit-id: 3ddee564ddd5ed4fde01ed95f30386115a07df78 [formerly a3a1da0357874b7d99a88bd785c8f60f8170f663]
Former-commit-id: 0e15a59e28993f8178fa9409a466ce93a9936906

frontmatter/frontmatter.go

@@ -136,7 +136,7 @@ type Block struct {
 	Type     string
 	HTMLType string
 	Content  *Content
-	Parent   *Block
+	Parent   *Block `json:"-"`
 }
 
 func rawToPretty(config interface{}, parent *Block) *Content {

frontmatter/runes.go

@@ -1,29 +1,28 @@
 package frontmatter
 
 import (
-	"bytes"
 	"errors"
 	"strings"
 )
 
 // HasRune checks if the file has the frontmatter rune
-func HasRune(file []byte) bool {
-	return strings.HasPrefix(string(file), "---") ||
-		strings.HasPrefix(string(file), "+++") ||
-		strings.HasPrefix(string(file), "{")
+func HasRune(file string) bool {
+	return strings.HasPrefix(file, "---") ||
+		strings.HasPrefix(file, "+++") ||
+		strings.HasPrefix(file, "{")
 }
 
 // AppendRune appends the frontmatter rune to a file
-func AppendRune(frontmatter []byte, mark rune) []byte {
-	frontmatter = bytes.TrimSpace(frontmatter)
+func AppendRune(frontmatter string, mark rune) string {
+	frontmatter = strings.TrimSpace(frontmatter)
 
 	switch mark {
 	case '-':
-		return []byte("---\n" + string(frontmatter) + "\n---")
+		return "---\n" + frontmatter + "\n---"
 	case '+':
-		return []byte("+++\n" + string(frontmatter) + "\n+++")
+		return "+++\n" + frontmatter + "\n+++"
 	case '{':
-		return []byte("{\n" + string(frontmatter) + "\n}")
+		return "{\n" + frontmatter + "\n}"
 	}
 
 	return frontmatter