add conversion

tags/tags.finops.tf

@@ -2,11 +2,12 @@ locals {
   _finops = { for k in ["number", "name", "role"] : k => try(local.tags_in.finops[k], try(var.finops[k], null)) }
   _finops_tags = {
     prefix         = "finops"
-    project_number = try(format("fs%010d", local._finops.number),null)
-    project_name   = try(replace(local._finops.name, "/[^a-z0-9_]/", ""),null)
+    project_number = try(format("fs%010d", local._finops.number), null)
+    project_name   = try(replace(local._finops.name, "/[^a-z0-9_]/", ""), null)
     project_role   = local._finops.role != null ? replace(replace(local._finops.role, "+", format("%v_", local._finops.name)), "/[^a-z0-9_]/", "") : null
   }
-  finops_tags = { for k, v in local._finops_tags : k => v if v != null && k != "prefix" }
+  _finops_tags2 = { for k, v in local._finops_tags : k => v if v != null && k != "prefix" }
+  finops_tags   = merge(local.legacy_finops_converted, local._finops_tags2)
 }
 
 resource "terraform_data" "finops" {

tags/tags.legacy.tf

@@ -0,0 +1,11 @@
+locals {
+  legacy_finops_tags = {
+    project_number = ["Project Number", "ProjectNumber"]
+    project_name   = ["Project Name", "ProjectName"]
+    project_role   = ["Project Role", "ProjectRole"]
+  }
+  legacy_finops_tags_map = { for k, v in transpose(local.legacy_finops_tags) : k => v[0] }
+
+  _legacy_finops1         = [for k, v in var.legacy_tags : { legacy_key = k, value = v, key = lookup(local.legacy_finops_tags_map, k, null) }]
+  legacy_finops_converted = merge([for t in local._legacy_finops1 : { (t.key) = lower(t.value) } if t.key != null]...)
+}

tags/variables.tf

@@ -33,3 +33,9 @@ variable "finops" {
 
 # variable "ops" {}
 # variable "mon" {}
+
+variable "legacy_tags" {
+  description = "Legacy tags (primarily the older finops tags) for which we will output a conversion"
+  type        = map(string)
+  default     = {}
+}