Templates can access modules in top order

Use `.OrderedModules` property to access modules
in their topological order.

lib/apply.go

@@ -31,11 +31,12 @@ import (
 
 // TemplateData is the data passed into template.
 type TemplateData struct {
-	Args        map[string]interface{}
-	Sha         string
-	Env         map[string]string
-	Modules     map[string]*Module
-	ModulesList []*Module
+	Args           map[string]interface{}
+	Sha            string
+	Env            map[string]string
+	Modules        map[string]*Module
+	ModulesList    []*Module
+	OrderedModules []*Module
 }
 
 // KVP is a key value pair.
@@ -288,10 +289,11 @@ func processTemplate(buffer []byte, m *Manifest, output io.Writer) error {
 	}
 
 	data := &TemplateData{
-		Sha:         m.Sha,
-		Env:         getEnvMap(),
-		Modules:     m.Modules.indexByName(),
-		ModulesList: sortedModules,
+		Sha:            m.Sha,
+		Env:            getEnvMap(),
+		Modules:        m.Modules.indexByName(),
+		ModulesList:    sortedModules,
+		OrderedModules: m.Modules,
 	}
 
 	return temp.Execute(output, data)

lib/apply_test.go

@@ -388,3 +388,25 @@ func TestTheOrderOfModulesList(t *testing.T) {
 
 	assert.Equal(t, "app-a,app-b,app-c,\n", output.String())
 }
+
+func TestTheOrderOfOrderedModulesList(t *testing.T) {
+	clean()
+	repo := NewTestRepo(t, ".tmp/repo")
+
+	check(t, repo.InitModuleWithOptions("app-a", &Spec{Name: "app-a", Dependencies: []string{"app-b"}}))
+	check(t, repo.InitModuleWithOptions("app-b", &Spec{Name: "app-b", Dependencies: []string{"app-c"}}))
+	check(t, repo.InitModule("app-c"))
+
+	check(t, repo.WriteContent("template.tmpl", `
+{{- range $i, $mod := .OrderedModules}}
+{{- $mod.Name }},
+{{- end}}
+`))
+
+	check(t, repo.Commit("first"))
+
+	output := new(bytes.Buffer)
+	check(t, NewWorld(t, ".tmp/repo").System.ApplyHead("template.tmpl", output))
+
+	assert.Equal(t, "app-c,app-b,app-a,\n", output.String())
+}