package bug import "github.com/MichaelMure/git-bug/repository" var _ Interface = &WithSnapshot{} // WithSnapshot encapsulate a Bug and maintain the corresponding Snapshot efficiently type WithSnapshot struct { *Bug snap *Snapshot } // Snapshot return the current snapshot func (b *WithSnapshot) Snapshot() *Snapshot { if b.snap == nil { snap := b.Bug.Compile() b.snap = &snap } return b.snap } // Append intercept Bug.Append() to update the snapshot efficiently func (b *WithSnapshot) Append(op Operation) { b.Bug.Append(op) if b.snap == nil { return } op.Apply(b.snap) b.snap.Operations = append(b.snap.Operations, op) } // Commit intercept Bug.Commit() to update the snapshot efficiently func (b *WithSnapshot) Commit(repo repository.ClockedRepo) error { err := b.Bug.Commit(repo) if err != nil { b.snap = nil return err } // Commit() shouldn't change anything of the bug state apart from the // initial ID set if b.snap == nil { return nil } b.snap.id = b.Bug.Id() return nil }