Added possibility to create VPC conditionally (#74)

* Added possibility to create VPC conditionally

* Added editorconfig and pre-commit hooks

.circleci/config.yml

@@ -10,9 +10,9 @@ jobs:
     <<: *terraform
     steps:
       - checkout
-      - run:
-          name: Add github.com to ~/.ssh/known_hosts
-          command: mkdir ~/.ssh && ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
+#      - run:
+#          name: Add github.com to ~/.ssh/known_hosts
+#          command: mkdir ~/.ssh && ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
       - run:
           name: terraform init
           command: terraform init -input=false

.editorconfig

+# EditorConfig is awesome: http://EditorConfig.org
+# Uses editorconfig to maintain consistent coding styles
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+max_line_length = 80
+trim_trailing_whitespace = true
+
+[*.{tf,tfvars}]
+indent_size = 2
+indent_style = space
+
+[*.md]
+max_line_length = 0
+trim_trailing_whitespace = false
+
+[Makefile]
+tab_width = 2
+indent_style = tab
+
+[COMMIT_EDITMSG]
+max_line_length = 0
\ No newline at end of file

.pre-commit-config.yaml

+repos:
+- repo: git://github.com/antonbabenko/pre-commit-terraform
+  sha: v1.4.0
+  hooks:
+    - id: terraform_fmt
+- repo: git://github.com/pre-commit/pre-commit-hooks
+  sha: v1.2.0
+  hooks:
+    - id: check-merge-conflict

README.md

@@ -19,16 +19,13 @@ These types of resources are supported:
 * [ElastiCache Subnet Group](https://www.terraform.io/docs/providers/aws/r/elasticache_subnet_group.html)
 * [Redshift Subnet Group](https://www.terraform.io/docs/providers/aws/r/redshift_subnet_group.html)
 * [DHCP Options Set](https://www.terraform.io/docs/providers/aws/r/vpc_dhcp_options.html)
+* [Main VPC Routing Table](https://www.terraform.io/docs/providers/aws/r/main_route_table_assoc.html)
+* [Default VPC Routing Table](https://www.terraform.io/docs/providers/aws/r/default_route_table.html)
 
 Usage
 -----
 
 ```hcl
-provider "aws" {
-  version = "~> 1.0.0"
-  region  = "eu-west-1"
-}
-
 module "vpc" {
   source = "terraform-aws-modules/vpc/aws"
 
@@ -85,6 +82,21 @@ Note that in the example we allocate 3 IPs because we will be provisioning 3 NAT
 If, on the other hand, `single_nat_gateway = true`, then `aws_eip.nat` would only need to allocate 1 IP.
 Passing the IPs into the module is done by setting two variables `reuse_nat_ips = true` and `external_nat_ip_ids = ["${aws_eip.nat.*.id}"]`.
 
+Conditional creation
+--------------------
+
+Sometimes you need to have a way to create VPC resources conditionally but Terraform does not allow to use `count` inside `module` block, so the solution is to specify argument `create_vpc`.
+
+```hcl
+# This VPC will not be created
+module "vpc" {
+  source = "terraform-aws-modules/vpc/aws"
+
+  create_vpc = false
+  # ... omitted
+}
+```
+
 Terraform version
 -----------------
 

outputs.tf

 # VPC
 output "vpc_id" {
   description = "The ID of the VPC"
-  value       = "${aws_vpc.this.id}"
+  value       = "${element(concat(aws_vpc.this.*.id, list("")), 0)}"
 }
 
 output "vpc_cidr_block" {
   description = "The CIDR block of the VPC"
-  value       = "${aws_vpc.this.cidr_block}"
+  value       = "${element(concat(aws_vpc.this.*.cidr_block, list("")), 0)}"
 }
 
 output "default_security_group_id" {
   description = "The ID of the security group created by default on VPC creation"
-  value       = "${aws_vpc.this.default_security_group_id}"
+  value       = "${element(concat(aws_vpc.this.*.default_security_group_id, list("")), 0)}"
 }
 
 output "default_network_acl_id" {
   description = "The ID of the default network ACL"
-  value       = "${aws_vpc.this.default_network_acl_id}"
+  value       = "${element(concat(aws_vpc.this.*.default_network_acl_id, list("")), 0)}"
 }
 
 output "default_route_table_id" {
   description = "The ID of the default route table"
-  value       = "${aws_vpc.this.default_route_table_id}"
+  value       = "${element(concat(aws_vpc.this.*.default_route_table_id, list("")), 0)}"
 }
 
 # Subnets

variables.tf

+variable "create_vpc" {
+  description = "Controls if VPC should be created (it affects almost all resources)"
+  default     = true
+}
+
 variable "name" {
   description = "Name to be used on all the resources as identifier"
   default     = ""