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-rw-r--r--bug/operations/label_change.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/bug/operations/label_change.go b/bug/operations/label_change.go
new file mode 100644
index 00000000..ca07f6f5
--- /dev/null
+++ b/bug/operations/label_change.go
@@ -0,0 +1,56 @@
+package operations
+
+import (
+ "github.com/MichaelMure/git-bug/bug"
+ "sort"
+)
+
+// LabelChangeOperation will add or remove a set of labels
+
+var _ bug.Operation = LabelChangeOperation{}
+
+type LabelChangeOperation struct {
+ bug.OpBase
+ Added []bug.Label
+ Removed []bug.Label
+}
+
+func NewLabelChangeOperation(author bug.Person, added, removed []bug.Label) LabelChangeOperation {
+ return LabelChangeOperation{
+ OpBase: bug.NewOpBase(bug.LabelChangeOp, author),
+ Added: added,
+ Removed: removed,
+ }
+}
+
+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
+}