Add terraform output changes along resource changes

Makefile

@@ -4,6 +4,9 @@ SHELL:=/bin/sh
 help: ## this help
 	@awk 'BEGIN {FS = ":.*?## ";  printf "Usage:\n  make \033[36m<target> \033[0m\n\nTargets:\n"} /^[a-zA-Z0-9_-]+:.*?## / {gsub("\\\\n",sprintf("\n%22c",""), $$2);printf "  \033[36m%-20s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)
 
+local-run: ## Run tftools locally
+	go run main.go summarize <demo.json
+
 doctoc: ## Create table of contents with doctoc
 	doctoc .
 
@@ -25,6 +28,7 @@ gosec: ## Run gosec
 update-dependencies: ## Update dependencies
 	go get -u ./...
 
+
 ##https://github.com/moovweb/gvm
 ##go get golang.org/x/tools/cmd/goimports
 ##go install golang.org/x/tools/cmd/goimports

cmd/commands.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"fmt"
+	"log"
 	"os"
 	"runtime"
 
@@ -54,7 +55,7 @@ var summarizeCmd = &cobra.Command{
 
 		output, err := reader.Reader(os.Stdin)
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 
 		parser.Parser(output, showTags, showUnchanged, compact, useMarkdown, useJson, metrics, prettyJSON)

demo.json

@@ -1,7 +1,14 @@
 {
   "format_version": "1.1",
-  "terraform_version": "1.2.9",
+  "terraform_version": "1.8.1",
   "planned_values": {
+    "outputs": {
+      "test": {
+        "sensitive": false,
+        "type": "string",
+        "value": "test2"
+      }
+    },
     "root_module": {
       "resources": [
         {
@@ -567,6 +574,18 @@
       }
     }
   ],
+  "output_changes": {
+    "test": {
+      "actions": [
+        "update"
+      ],
+      "before": "test1",
+      "after": "test2",
+      "after_unknown": false,
+      "before_sensitive": false,
+      "after_sensitive": false
+    }
+  },
   "prior_state": {
     "format_version": "1.0",
     "terraform_version": "1.2.9",

internal/parser/parser.go

@@ -30,6 +30,8 @@ func Parser(output []byte, showTags, showUnchanged, compact, useMarkdown bool, u
 		return
 	}
 
+	// TODO: add also output changes using data.OutputChanges
+
 	for _, resourceChange := range data.ResourceChanges {
 		processResourceChange(resourceChange, showTags)
 	}

internal/reader/reader.go

@@ -31,5 +31,5 @@ func Reader(stdin *os.File) ([]byte, error) {
 		}
 		return data, nil
 	}
-	return nil, fmt.Errorf("no data to be processed")
+	return nil, fmt.Errorf("no data to be processed. Please proide a valid tf plan json file")
 }