First (unsuccessful) attempt at day 7.1.

2018/internal/tree/debug.go

@@ -0,0 +1,33 @@
+package tree
+
+import (
+	"fmt"
+)
+
+func DebugPrintTree(root *Node) {
+	debugPrintTreeR(root, 0)
+}
+
+func debugPrintTreeR(node *Node, level int) {
+	for i := 0; i < level; i++ {
+		fmt.Printf(" ")
+	}
+
+	DebugPrintNode(node)
+
+	for _, child := range node.Children {
+		debugPrintTreeR(child, level+1)
+	}
+}
+
+func DebugPrintNode(node *Node) {
+	fmt.Printf("%c @ %p. Children: ", node.Name, node)
+	for _, child := range node.Children {
+		fmt.Printf("%c ", child.Name)
+	}
+	fmt.Printf("Parents: ")
+	for _, parent := range node.Parents {
+		fmt.Printf("%c ", parent.Name)
+	}
+	fmt.Printf("\n")
+}