config/module: NewTreeModule is easier to use

config/module/tree.go

@@ -42,8 +42,20 @@ const (
 )
 
 // NewTree returns a new Tree for the given config structure.
-func NewTree(c *config.Config) *Tree {
-	return &Tree{config: c}
+func NewTree(name string, c *config.Config) *Tree {
+	return &Tree{config: c, name: name}
+}
+
+// NewTreeModule is like NewTree except it parses the configuration in
+// the directory and gives it a specific name. Use a blank name "" to specify
+// the root module.
+func NewTreeModule(name, dir string) (*Tree, error) {
+	c, err := config.LoadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewTree(name, c), nil
 }
 
 // Children returns the children of this tree (the modules that are
@@ -141,14 +153,11 @@ func (t *Tree) Load(s Storage, mode GetMode) error {
 		}
 
 		// Load the configuration
-		c, err := config.LoadDir(dir)
+		children[m.Name], err = NewTreeModule(m.Name, dir)
 		if err != nil {
 			return fmt.Errorf(
 				"module %s: %s", m.Name, err)
 		}
-
-		children[m.Name] = NewTree(c)
-		children[m.Name].name = m.Name
 	}
 
 	// Go through all the children and load them.

config/module/tree_test.go

@@ -8,7 +8,7 @@ import (
 
 func TestTreeLoad(t *testing.T) {
 	storage := testStorage(t)
-	tree := NewTree(testConfig(t, "basic"))
+	tree := NewTree("", testConfig(t, "basic"))
 
 	if tree.Loaded() {
 		t.Fatal("should not be loaded")
@@ -46,7 +46,7 @@ func TestTreeLoad(t *testing.T) {
 
 func TestTreeLoad_duplicate(t *testing.T) {
 	storage := testStorage(t)
-	tree := NewTree(testConfig(t, "dup"))
+	tree := NewTree("", testConfig(t, "dup"))
 
 	if tree.Loaded() {
 		t.Fatal("should not be loaded")
@@ -59,7 +59,7 @@ func TestTreeLoad_duplicate(t *testing.T) {
 }
 
 func TestTreeModules(t *testing.T) {
-	tree := NewTree(testConfig(t, "basic"))
+	tree := NewTree("", testConfig(t, "basic"))
 	actual := tree.Modules()
 
 	expected := []*Module{
@@ -72,7 +72,7 @@ func TestTreeModules(t *testing.T) {
 }
 
 func TestTreeName(t *testing.T) {
-	tree := NewTree(testConfig(t, "basic"))
+	tree := NewTree("", testConfig(t, "basic"))
 	actual := tree.Name()
 
 	if actual != "<root>" {
@@ -81,7 +81,7 @@ func TestTreeName(t *testing.T) {
 }
 
 func TestTreeValidate_badChild(t *testing.T) {
-	tree := NewTree(testConfig(t, "validate-child-bad"))
+	tree := NewTree("", testConfig(t, "validate-child-bad"))
 
 	if err := tree.Load(testStorage(t), GetModeGet); err != nil {
 		t.Fatalf("err: %s", err)
@@ -93,7 +93,7 @@ func TestTreeValidate_badChild(t *testing.T) {
 }
 
 func TestTreeValidate_badChildOutput(t *testing.T) {
-	tree := NewTree(testConfig(t, "validate-bad-output"))
+	tree := NewTree("", testConfig(t, "validate-bad-output"))
 
 	if err := tree.Load(testStorage(t), GetModeGet); err != nil {
 		t.Fatalf("err: %s", err)
@@ -105,7 +105,7 @@ func TestTreeValidate_badChildOutput(t *testing.T) {
 }
 
 func TestTreeValidate_badChildVar(t *testing.T) {
-	tree := NewTree(testConfig(t, "validate-bad-var"))
+	tree := NewTree("", testConfig(t, "validate-bad-var"))
 
 	if err := tree.Load(testStorage(t), GetModeGet); err != nil {
 		t.Fatalf("err: %s", err)
@@ -117,7 +117,7 @@ func TestTreeValidate_badChildVar(t *testing.T) {
 }
 
 func TestTreeValidate_badRoot(t *testing.T) {
-	tree := NewTree(testConfig(t, "validate-root-bad"))
+	tree := NewTree("", testConfig(t, "validate-root-bad"))
 
 	if err := tree.Load(testStorage(t), GetModeGet); err != nil {
 		t.Fatalf("err: %s", err)
@@ -129,7 +129,7 @@ func TestTreeValidate_badRoot(t *testing.T) {
 }
 
 func TestTreeValidate_good(t *testing.T) {
-	tree := NewTree(testConfig(t, "validate-child-good"))
+	tree := NewTree("", testConfig(t, "validate-child-good"))
 
 	if err := tree.Load(testStorage(t), GetModeGet); err != nil {
 		t.Fatalf("err: %s", err)
@@ -141,13 +141,14 @@ func TestTreeValidate_good(t *testing.T) {
 }
 
 func TestTreeValidate_notLoaded(t *testing.T) {
-	tree := NewTree(testConfig(t, "basic"))
+	tree := NewTree("", testConfig(t, "basic"))
 
 	if err := tree.Validate(); err == nil {
 		t.Fatal("should error")
 	}
 }
 
+
 const treeLoadStr = `
 <root>
   foo