Add --jsonpath to helm show chart

Signed-off-by: Gabriel Féron <gabriel.feron@hellofresh.com>

cmd/helm/show.go

@@ -174,9 +174,10 @@ func addShowFlags(subCmd *cobra.Command, client *action.Show) {
 	f := subCmd.Flags()
 
 	f.BoolVar(&client.Devel, "devel", false, "use development versions, too. Equivalent to version '>0.0.0-0'. If --version is set, this is ignored")
-	if subCmd.Name() == "values" {
+	if subCmd.Name() == "chart" || subCmd.Name() == "values" {
 		f.StringVar(&client.JSONPathTemplate, "jsonpath", "", "supply a JSONPath expression to filter the output")
 	}
+
 	addChartPathOptionsFlags(f, &client.ChartPathOptions)
 
 	err := subCmd.RegisterFlagCompletionFunc("version", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {

pkg/action/show.go

@@ -86,7 +86,15 @@ func (s *Show) Run(chartpath string) (string, error) {
 
 	var out strings.Builder
 	if s.OutputFormat == ShowChart || s.OutputFormat == ShowAll {
-		fmt.Fprintf(&out, "%s\n", cf)
+		if s.JSONPathTemplate != "" {
+			printer, err := printers.NewJSONPathPrinter(s.JSONPathTemplate)
+			if err != nil {
+				return "", errors.Wrapf(err, "error parsing jsonpath %s", s.JSONPathTemplate)
+			}
+			printer.Execute(&out, s.chart.Metadata)
+		} else {
+			fmt.Fprintf(&out, "%s\n", cf)
+		}
 	}
 
 	if (s.OutputFormat == ShowValues || s.OutputFormat == ShowAll) && s.chart.Values != nil {