package operations import ( "fmt" "io" "io/ioutil" "sort" "github.com/MichaelMure/git-bug/bug" ) var _ bug.Operation = LabelChangeOperation{} // LabelChangeOperation define a Bug operation to add or remove labels type LabelChangeOperation struct { bug.OpBase Added []bug.Label Removed []bug.Label } // Apply apply the operation func (op LabelChangeOperation) Apply(snapshot bug.Snapshot) bug.Snapshot { // Add in the set AddLoop: for _, added := range op.Added { for _, label := range snapshot.Labels { if label == added { // Already exist continue AddLoop } } snapshot.Labels = append(snapshot.Labels, added) } // Remove in the set for _, removed := range op.Removed { for i, label := range snapshot.Labels { if label == removed { snapshot.Labels[i] = snapshot.Labels[len(snapshot.Labels)-1] snapshot.Labels = snapshot.Labels[:len(snapshot.Labels)-1] } } } // Sort sort.Slice(snapshot.Labels, func(i, j int) bool { return string(snapshot.Labels[i]) < string(snapshot.Labels[j]) }) return snapshot } func NewLabelChangeOperation(author bug.Person, added, removed []bug.Label) LabelChangeOperation { return LabelChangeOperation{ OpBase: bug.NewOpBase(bug.LabelChangeOp, author), Added: added, Removed: removed, } } // ChangeLabels is a convenience function to apply the operation func ChangeLabels(out io.Writer, b *bug.Bug, author bug.Person, add, remove []string) error { var added, removed []bug.Label if out == nil { out = ioutil.Discard } snap := b.Compile() for _, str := range add { label := bug.Label(str) // check for duplicate if labelExist(added, label) { fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str) continue } // check that the label doesn't already exist if labelExist(snap.Labels, label) { fmt.Fprintf(out, "label \"%s\" is already set on this bug\n", str) continue } added = append(added, label) } for _, str := range remove { label := bug.Label(str) // check for duplicate if labelExist(removed, label) { fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str) continue } // check that the label actually exist if !labelExist(snap.Labels, label) { fmt.Fprintf(out, "label \"%s\" doesn't exist on this bug\n", str) continue } removed = append(removed, label) } if len(added) == 0 && len(removed) == 0 { return fmt.Errorf("no label added or removed") } labelOp := NewLabelChangeOperation(author, added, removed) b.Append(labelOp) return nil } func labelExist(labels []bug.Label, label bug.Label) bool { for _, l := range labels { if l == label { return true } } return false }