1 files changed, 39 insertions, 1 deletions
diff --git a/operations/set_title.go b/operations/set_title.go
index 7aa76268..46addce6 100644
--- a/operations/set_title.go
+++ b/operations/set_title.go
@@ -1,7 +1,11 @@
 package operations
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/MichaelMure/git-bug/bug"
+	"github.com/MichaelMure/git-bug/util/text"
 )
 
 // SetTitleOperation will change the title of a bug
@@ -20,6 +24,34 @@ func (op SetTitleOperation) Apply(snapshot bug.Snapshot) bug.Snapshot {
 	return snapshot
 }
 
+func (op SetTitleOperation) Validate() error {
+	if err := bug.OpBaseValidate(op, bug.SetTitleOp); err != nil {
+		return err
+	}
+
+	if text.Empty(op.Title) {
+		return fmt.Errorf("title is empty")
+	}
+
+	if strings.Contains(op.Title, "\n") {
+		return fmt.Errorf("title should be a single line")
+	}
+
+	if !text.Safe(op.Title) {
+		return fmt.Errorf("title should be fully printable")
+	}
+
+	if strings.Contains(op.Was, "\n") {
+		return fmt.Errorf("previous title should be a single line")
+	}
+
+	if !text.Safe(op.Was) {
+		return fmt.Errorf("previous title should be fully printable")
+	}
+
+	return nil
+}
+
 func NewSetTitleOp(author bug.Person, title string, was string) SetTitleOperation {
 	return SetTitleOperation{
 		OpBase: bug.NewOpBase(bug.SetTitleOp, author),
@@ -29,7 +61,7 @@ func NewSetTitleOp(author bug.Person, title string, was string) SetTitleOperatio
 }
 
 // Convenience function to apply the operation
-func SetTitle(b bug.Interface, author bug.Person, title string) {
+func SetTitle(b bug.Interface, author bug.Person, title string) error {
 	it := bug.NewOperationIterator(b)
 
 	var lastTitleOp bug.Operation
@@ -48,5 +80,11 @@ func SetTitle(b bug.Interface, author bug.Person, title string) {
 	}
 
 	setTitleOp := NewSetTitleOp(author, title, was)
+
+	if err := setTitleOp.Validate(); err != nil {
+		return err
+	}
+
 	b.Append(setTitleOp)
+	return nil
 }