add helm compatibility option

README.md

@@ -14,6 +14,8 @@ Usage of ./spry:
         Output delimiter between template files rendered (default "---")
   -f value
         Specify a values file (JSON or YAML)
+  -helm
+        Whether to nest provided values under .Values
   -set value
         Set a specific value (foo.bar=spam)
 ```

main.go

@@ -77,6 +77,7 @@ var flags struct {
 	valuesFiles     valFileSlice
 	values          valSlice
 	outputDelimiter string
+	helmCompat      bool
 }
 
 func init() {
@@ -87,6 +88,7 @@ func init() {
 		"d", "---",
 		"Output delimiter between template files rendered",
 	)
+	flag.BoolVar(&flags.helmCompat, "helm", false, "Whether to nest provided values under .Values")
 	flag.Parse()
 }
 
@@ -164,8 +166,13 @@ func expandFiles(files []string) (expFiles []string) {
 	return
 }
 
-func mergeValues() (result map[string]interface{}) {
-	result = map[string]interface{}{}
+func mergeValues() (res map[string]interface{}) {
+	res = map[string]interface{}{}
+	result := res
+	if flags.helmCompat {
+		res["Values"] = map[string]interface{}{}
+		result = res["Values"].(map[string]interface{})
+	}
 	for _, vf := range flags.valuesFiles {
 		vfContent, err := os.ReadFile(vf)
 		checkErr(err)