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 @@
 
 import (
 	"fmt"
+	"log"
 	"os"
 	"runtime"
 
@@ -21,7 +22,7 @@
 	showUnchanged bool
 	compact       bool
 	useMarkdown   bool
 	useJson       bool
 	metrics       bool
 	prettyJSON    bool
 )
@@ -41,7 +42,7 @@
 	Use:   "summarize",
 	Short: "Get a summary of terraform/terragrunt output",
 	Long:  "Get a summary of terraform/terragrunt output plan (created|updated|destroyed...)",
 	Run: func(cmd *cobra.Command, args []string) {
 		if useMarkdown && useJson {
 			fmt.Println("-m (Markdown output) and -j (JSON output) are mutually exclusive")
 			os.Exit(1)
@@ -54,7 +55,7 @@
 
 		output, err := reader.Reader(os.Stdin)
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 
 		parser.Parser(output, showTags, showUnchanged, compact, useMarkdown, useJson, metrics, prettyJSON)
@@ -66,7 +67,7 @@
 	Use:   "usage",
 	Short: "print usage",
 	Long:  "print usage in a pretty markdown render using terminal. This require internet connection since it fetch usage.md from github url",
 	Run: func(cmd *cobra.Command, args []string) {
 		if len(version) == 0 {
 			version = "main"
 		}
@@ -80,7 +81,7 @@
 	Use:   "version",
 	Short: "tftools current version",
 	Long:  "Get the cli tftools version installed",
 	Run: func(cmd *cobra.Command, args []string) {
 		fmt.Printf("tftools: %s with go version %s %s/%s", version, goversion, goos, goarch)
 	},
 }

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

@@ -23,13 +23,15 @@
 	resourcesList = make(map[string][]string)
 )
 
 func Parser(output []byte, showTags, showUnchanged, compact, useMarkdown bool, useJson bool, metrics bool, prettyJSON bool) {
 	var data tfjson.Plan
 	if err := json.Unmarshal(output, &data); err != nil {
 		fmt.Printf("Error unmarshalling plan: %v\n", err)
 		return
 	}
 
+	// TODO: add also output changes using data.OutputChanges
+
 	for _, resourceChange := range data.ResourceChanges {
 		processResourceChange(resourceChange, showTags)
 	}
@@ -66,7 +68,7 @@
 			addActionToResourceList(resourceChange.Change.Actions, resourceChange.Address)
 		}
 		return
 	} else {
 		// Not an update, add to other categories as necessary
 		addActionToResourceList(resourceChange.Change.Actions, resourceChange.Address)
 	}
@@ -270,7 +272,7 @@
 	}
 }
 
 func PrintPlanSummary(showTags, showUnchanged, compact, useMarkdown bool, useJson bool, metrics bool, prettyJSON bool) {
 	if useJson || prettyJSON {
 		PrintResourcesJson(showTags, showUnchanged, metrics, prettyJSON)
 	} else {
@@ -286,7 +288,7 @@
 	}
 }
 
 func PrintResourcesJson(showTags bool, showUnchanged bool, metrics bool, prettyJSON bool) {
 	if metrics {
 		var metricsData = make(map[string]int)
 

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")
 }