Tags the same if overlapping resources (#35)

main.tf

@@ -12,6 +12,10 @@ provider "aws" {
 locals {
  this_region = data.aws_region.this.name
  peer_region = data.aws_region.peer.name
+
+ same_region = data.aws_region.this.name == data.aws_region.peer.name
+ same_account = data.aws_caller_identity.this.account_id == data.aws_caller_identity.peer.account_id
+ same_acount_and_region = local.same_region && local.same_account
 }
 
 ##########################
@@ -23,7 +27,7 @@ resource "aws_vpc_peering_connection" "this" {
  peer_vpc_id = var.peer_vpc_id
  vpc_id = var.this_vpc_id
  peer_region = data.aws_region.peer.name
- tags = var.tags
+ tags = merge(var.tags, map("Side", local.same_acount_and_region ? "Both" : "Requester"))
 }
 
 ######################################
@@ -33,7 +37,7 @@ resource "aws_vpc_peering_connection_accepter" "peer_accepter" {
  provider = "aws.peer"
  vpc_peering_connection_id = aws_vpc_peering_connection.this.id
  auto_accept = var.auto_accept_peering
- tags = merge(var.tags, map("Side", "Accepter"))
+ tags = merge(var.tags, map("Side", local.same_acount_and_region ? "Both" : "Accepter"))
 }
 
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