Add context

examples/complete/main.tf

@@ -1,8 +1,17 @@
-module "label" {
+module "label1" {
   source     = "../../"
   namespace  = "Namespace"
   stage      = "Stage"
-  name       = "Name"
+  name       = "Name1"
   attributes = ["1", "2", "3", ""]
-  tags       = "${map("Key", "Value")}"
+
+  tags = {
+    "SomeKey" = "SomeValue"
+  }
+}
+
+module "label2" {
+  source  = "../../"
+  context = "${module.label1.context}"
+  name    = "Name2"
 }

examples/complete/outputs.tf

@@ -1,23 +1,55 @@
-output "id" {
-  value = "${module.label.id}"
+output "label1_id" {
+  value = "${module.label1.id}"
 }
 
-output "name" {
-  value = "${module.label.name}"
+output "label1_name" {
+  value = "${module.label1.name}"
 }
 
-output "namespace" {
-  value = "${module.label.namespace}"
+output "label1_namespace" {
+  value = "${module.label1.namespace}"
 }
 
-output "stage" {
-  value = "${module.label.stage}"
+output "label1_stage" {
+  value = "${module.label1.stage}"
 }
 
-output "attributes" {
-  value = "${module.label.attributes}"
+output "label1_attributes" {
+  value = "${module.label1.attributes}"
 }
 
-output "tags" {
-  value = "${module.label.tags}"
+output "label1_tags" {
+  value = "${module.label1.tags}"
+}
+
+output "label1_context" {
+  value = "${module.label1.context}"
+}
+
+output "label2_id" {
+  value = "${module.label2.id}"
+}
+
+output "label2_name" {
+  value = "${module.label2.name}"
+}
+
+output "label2_namespace" {
+  value = "${module.label2.namespace}"
+}
+
+output "label2_stage" {
+  value = "${module.label2.stage}"
+}
+
+output "label2_attributes" {
+  value = "${module.label2.attributes}"
+}
+
+output "label2_tags" {
+  value = "${module.label2.tags}"
+}
+
+output "label2_context" {
+  value = "${module.label2.context}"
 }

main.tf

@@ -1,22 +1,36 @@
 locals {
-  enabled    = "${var.enabled == "true" ? true : false }"
-  id         = "${local.enabled ? lower(join(var.delimiter, compact(concat(list(var.namespace, var.stage, var.name), var.attributes)))) : ""}"
-  name       = "${local.enabled ? lower(format("%v", var.name)) : ""}"
-  namespace  = "${local.enabled ? lower(format("%v", var.namespace)) : ""}"
-  stage      = "${local.enabled ? lower(format("%v", var.stage)) : ""}"
-  attributes = "${local.enabled ? lower(format("%v", join(var.delimiter, compact(var.attributes)))) : ""}"
-
-  tags = "${
-      merge( 
-        map(
-          "Name", "${local.id}",
-          "Namespace", "${local.namespace}",
-          "Stage", "${local.stage}"
-        ), var.tags
-      )
-    }"
+  enabled = "${var.enabled == "true" ? true : false }"
+
+  id         = "${lower(join(var.delimiter, compact(concat(list(local.namespace, local.stage, local.name, local.attributes)))))}"
+  name       = "${var.name == "" ? lookup(var.context, "name", "") : lower(format("%v", var.name))}"
+  namespace  = "${var.namespace == "" ? lookup(var.context, "namespace", "") : lower(format("%v", var.namespace))}"
+  stage      = "${var.stage == "" ? lookup(var.context, "stage", "") : lower(format("%v", var.stage))}"
+  attributes = "${length(var.attributes) == 0 ? lookup(var.context, "attributes", "") : lower(format("%v", join(var.delimiter, compact(var.attributes))))}"
+
+  generated_tags = {
+    "Name"      = "${local.enabled ? local.id : ""}"
+    "Namespace" = "${local.enabled ? local.namespace : ""}"
+    "Stage"     = "${local.enabled ? local.stage : ""}"
+  }
+
+  tags = "${merge(local.generated_tags, var.tags)}"
 
   tags_as_list_of_maps = ["${null_resource.tags_as_list_of_maps.*.triggers}"]
+
+  null_tags = {
+    Name      = ""
+    Namespace = ""
+    Stage     = ""
+  }
+
+  context = {
+    name       = "${local.name}"
+    namespace  = "${local.namespace}"
+    stage      = "${local.stage}"
+    attributes = "${local.attributes}"
+    tags       = "${local.tags}"
+    delimiter  = "${var.delimiter}"
+  }
 }
 
 resource "null_resource" "tags_as_list_of_maps" {

outputs.tf

@@ -1,25 +1,25 @@
 output "id" {
-  value       = "${local.id}"
+  value       = "${local.enabled ? local.id : ""}"
   description = "Disambiguated ID"
 }
 
 output "name" {
-  value       = "${local.name}"
+  value       = "${local.enabled ? local.name : ""}"
   description = "Normalized name"
 }
 
 output "namespace" {
-  value       = "${local.namespace}"
+  value       = "${local.enabled ? local.namespace : ""}"
   description = "Normalized namespace"
 }
 
 output "stage" {
-  value       = "${local.stage}"
+  value       = "${local.enabled ? local.stage : ""}"
   description = "Normalized stage"
 }
 
 output "attributes" {
-  value       = "${local.attributes}"
+  value       = "${local.enabled ? local.attributes : ""}"
   description = "Normalized attributes"
 }
 
@@ -32,3 +32,8 @@ output "tags_as_list_of_maps" {
   value       = ["${local.tags_as_list_of_maps}"]
   description = "Additional tags as a list of maps, which can be used in several AWS resources"
 }
+
+output "context" {
+  value       = "${local.context}"
+  description = "Context of this module to pass between other modules"
+}

variables.tf

@@ -1,13 +1,16 @@
 variable "namespace" {
   description = "Namespace, which could be your organization name, e.g. 'cp' or 'cloudposse'"
+  default     = ""
 }
 
 variable "stage" {
   description = "Stage, e.g. 'prod', 'staging', 'dev', or 'test'"
+  default     = ""
 }
 
 variable "name" {
   description = "Solution name, e.g. 'app' or 'jenkins'"
+  default     = ""
 }
 
 variable "enabled" {
@@ -38,3 +41,9 @@ variable "additional_tag_map" {
   default     = {}
   description = "Additional tags for appending to each tag map."
 }
+
+variable "context" {
+  type        = "map"
+  default     = {}
+  description = "Default context to use for passing state between label invocations"
+}