Rename shared packages by day instead of vaguely by purpose.

2018/internal/tree/breadthfirst.go

@@ -1,44 +0,0 @@
-// BreadthFirstOrder and its companion functions ended up not giving the
-// right solution, but I'm leaving them here as a useful generic tree
-// algorithm.
-package tree
-
-func BreadthFirstOrder(root *Node) []*Node {
-	seen := make(map[rune]bool)
-	return breadthFirstOrderR(root, seen)
-}
-
-func findTreeRoot(depMap map[rune]*Node) *Node {
-	for _, node := range depMap {
-		if len(node.Parents) == 0 {
-			return node
-		}
-	}
-
-	return nil
-}
-
-func breadthFirstOrderR(node *Node, seen map[rune]bool) []*Node {
-	order := []*Node{}
-
-	// handle root
-	if len(node.Parents) == 0 {
-		order = append(order, node)
-		seen[node.Name] = true
-	}
-
-	// add children we haven't seen before
-	for _, child := range node.Children {
-		if _, ok := seen[child.Name]; !ok {
-			order = append(order, child)
-			seen[child.Name] = true
-		}
-	}
-
-	// recurse
-	for _, child := range node.Children {
-		order = append(order, breadthFirstOrderR(child, seen)...)
-	}
-
-	return order
-}