feat(terraform): add nx executors for terraform format command (#150)

This adds a new [NX
executor](https://nx.dev/core-features/plugin-features/use-task-executors)
for running the [terraform format
command](https://developer.hashicorp.com/terraform/cli/commands/fmt).

packages/terraform/executors.json

@@ -1,5 +1,10 @@
 {
   "executors": {
+    "fmt": {
+      "implementation": "./src/executors/fmt/fmt.impl",
+      "schema": "./src/executors/fmt/schema.json",
+      "description": "fmt executor"
+    },
     "plan": {
       "implementation": "./src/executors/plan/plan.impl",
       "schema": "./src/executors/plan/schema.json",
@@ -17,6 +22,11 @@
     }
   },
   "builders": {
+    "fmt": {
+      "implementation": "./src/executors/fmt/fmt.impl",
+      "schema": "./src/executors/fmt/schema.json",
+      "description": "fmt executor"
+    },
     "plan": {
       "implementation": "./src/executors/plan/plan.impl",
       "schema": "./src/executors/plan/schema.json",

packages/terraform/src/executors/fmt/compat.ts

@@ -0,0 +1,5 @@
+import { convertNxExecutor } from '@nx/devkit'
+
+import fmtExecutor from './fmt.impl'
+
+export default convertNxExecutor(fmtExecutor)

packages/terraform/src/executors/fmt/fmt.impl.ts

@@ -0,0 +1,3 @@
+import { createExecutor } from '../../utils/create-executor'
+
+export default createExecutor('fmt')

packages/terraform/src/executors/fmt/schema.json

@@ -0,0 +1,16 @@
+{
+  "version": 2,
+  "outputCapture": "direct-nodejs",
+  "$schema": "http://json-schema.org/schema",
+  "type": "object",
+  "title": "Format executor",
+  "description": "Format",
+  "properties": {
+    "write": {
+      "type": "boolean",
+      "title": "Write to file",
+      "description": "Write to file",
+      "default": false
+    }
+  }
+}

packages/terraform/src/utils/create-executor.ts

@@ -22,7 +22,7 @@ export function createExecutor(command: string) {
     }
 
     const { sourceRoot } = context.workspace.projects[context.projectName]
-    const { backendConfig = [], planFile, ciMode, autoApproval } = options
+    const { backendConfig = [], planFile, ciMode, autoApproval, formatWrite } = options
 
     let env = {}
     if (ciMode) {
@@ -41,7 +41,10 @@ export function createExecutor(command: string) {
         ),
         command === 'plan' && planFile && `-out ${planFile}`,
         command === 'apply' && autoApproval && '-auto-approve',
-        command === 'apply' && planFile
+        command === 'apply' && planFile,
+        command === 'fmt' && '--recursive',
+        command === 'fmt' && !formatWrite && '--check --list',
+        command === 'fmt' && formatWrite && '--write --diff'
       ]),
       {
         cwd: sourceRoot,