implements dagger do

Signed-off-by: Richard Jones <richard@dagger.io>

plan/action.go

@@ -0,0 +1,34 @@
+package plan
+
+import (
+	"cuelang.org/go/cue"
+)
+
+type Action struct {
+	Name     string
+	Hidden   bool
+	Path     cue.Path
+	Comment  string
+	Children []*Action
+	// pkg      string
+}
+
+func (a *Action) AddChild(c *Action) {
+	a.Children = append(a.Children, c)
+}
+
+func (a *Action) FindByPath(path cue.Path) *Action {
+	queue := []*Action{a}
+
+	for len(queue) > 0 {
+		nextUp := queue[0]
+		queue = queue[1:]
+		if nextUp.Path.String() == path.String() {
+			return nextUp
+		}
+		if len(nextUp.Children) > 0 {
+			queue = append(queue, nextUp.Children...)
+		}
+	}
+	return nil
+}