1 files changed, 112 insertions, 0 deletions
diff --git a/entities/bug/op_set_title.go b/entities/bug/op_set_title.go
new file mode 100644
index 00000000..75efd08e
--- /dev/null
+++ b/entities/bug/op_set_title.go
@@ -0,0 +1,112 @@
+package bug
+
+import (
+	"fmt"
+
+	"github.com/MichaelMure/git-bug/entities/identity"
+	"github.com/MichaelMure/git-bug/entity"
+	"github.com/MichaelMure/git-bug/entity/dag"
+	"github.com/MichaelMure/git-bug/util/timestamp"
+
+	"github.com/MichaelMure/git-bug/util/text"
+)
+
+var _ Operation = &SetTitleOperation{}
+
+// SetTitleOperation will change the title of a bug
+type SetTitleOperation struct {
+	dag.OpBase
+	Title string `json:"title"`
+	Was   string `json:"was"`
+}
+
+func (op *SetTitleOperation) Id() entity.Id {
+	return dag.IdOperation(op, &op.OpBase)
+}
+
+func (op *SetTitleOperation) Apply(snapshot *Snapshot) {
+	snapshot.Title = op.Title
+	snapshot.addActor(op.Author())
+
+	item := &SetTitleTimelineItem{
+		id:       op.Id(),
+		Author:   op.Author(),
+		UnixTime: timestamp.Timestamp(op.UnixTime),
+		Title:    op.Title,
+		Was:      op.Was,
+	}
+
+	snapshot.Timeline = append(snapshot.Timeline, item)
+}
+
+func (op *SetTitleOperation) Validate() error {
+	if err := op.OpBase.Validate(op, SetTitleOp); err != nil {
+		return err
+	}
+
+	if text.Empty(op.Title) {
+		return fmt.Errorf("title is empty")
+	}
+
+	if !text.SafeOneLine(op.Title) {
+		return fmt.Errorf("title has unsafe characters")
+	}
+
+	if !text.SafeOneLine(op.Was) {
+		return fmt.Errorf("previous title has unsafe characters")
+	}
+
+	return nil
+}
+
+func NewSetTitleOp(author identity.Interface, unixTime int64, title string, was string) *SetTitleOperation {
+	return &SetTitleOperation{
+		OpBase: dag.NewOpBase(SetTitleOp, author, unixTime),
+		Title:  title,
+		Was:    was,
+	}
+}
+
+type SetTitleTimelineItem struct {
+	id       entity.Id
+	Author   identity.Interface
+	UnixTime timestamp.Timestamp
+	Title    string
+	Was      string
+}
+
+func (s SetTitleTimelineItem) Id() entity.Id {
+	return s.id
+}
+
+// IsAuthored is a sign post method for gqlgen
+func (s SetTitleTimelineItem) IsAuthored() {}
+
+// SetTitle is a convenience function to change a bugs title
+func SetTitle(b Interface, author identity.Interface, unixTime int64, title string, metadata map[string]string) (*SetTitleOperation, error) {
+	var lastTitleOp *SetTitleOperation
+	for _, op := range b.Operations() {
+		switch op := op.(type) {
+		case *SetTitleOperation:
+			lastTitleOp = op
+		}
+	}
+
+	var was string
+	if lastTitleOp != nil {
+		was = lastTitleOp.Title
+	} else {
+		was = b.FirstOp().(*CreateOperation).Title
+	}
+
+	op := NewSetTitleOp(author, unixTime, title, was)
+	for key, value := range metadata {
+		op.SetMetadata(key, value)
+	}
+	if err := op.Validate(); err != nil {
+		return nil, err
+	}
+
+	b.Append(op)
+	return op, nil
+}