Adding new errors and centralising handling

internal/repository/errors.go

@@ -0,0 +1,35 @@
+package repository
+
+import (
+	"fmt"
+
+	"git.hrafn.xyz/aether/notes/internal/models"
+)
+
+type EmptyContent struct {}
+type EmptyTitle struct {}
+type NoOP struct {}
+type EmptyUpdate struct{}
+type TitleOverflow struct {
+	length int
+}
+
+func (e *EmptyContent) Error() string {
+	return "content cannot be empty"
+}
+
+func (e *EmptyTitle) Error() string {
+	return "title cannot be empty"
+}
+
+func (e *NoOP) Error() string {
+	return "no operation required"
+}
+
+func (e *EmptyUpdate) Error() string {
+	return "update cannot be empty"
+}
+
+func (e *TitleOverflow) Error() string {
+	return fmt.Sprintf("title max length %d, %d provided", models.NoteTitleMaxLength, e.length)
+}