feat(cmd): implement `helm get --template`

Signed-off-by: Matthew Fisher <matt.fisher@microsoft.com>

cmd/helm/get.go

@@ -39,6 +39,7 @@ chart, the supplied values, and the generated manifest file.
 `
 
 func newGetCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
+	var template string
 	client := action.NewGet(cfg)
 
 	cmd := &cobra.Command{
@@ -51,11 +52,19 @@ func newGetCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 			if err != nil {
 				return err
 			}
+			if template != "" {
+				data := map[string]interface{}{
+					"Release": res,
+				}
+				return tpl(template, data, out)
+			}
 			return printRelease(out, res)
 		},
 	}
 
-	cmd.Flags().IntVar(&client.Version, "revision", 0, "get the named release with revision")
+	f := cmd.Flags()
+	f.IntVar(&client.Version, "revision", 0, "get the named release with revision")
+	f.StringVar(&template, "template", "", "go template for formatting the output, eg: {{.Release.Name}}")
 
 	cmd.AddCommand(newGetValuesCmd(cfg, out))
 	cmd.AddCommand(newGetManifestCmd(cfg, out))

cmd/helm/get_test.go

@@ -28,6 +28,11 @@ func TestGetCmd(t *testing.T) {
 		cmd:    "get thomas-guide",
 		golden: "output/get-release.txt",
 		rels:   []*release.Release{release.Mock(&release.MockReleaseOptions{Name: "thomas-guide"})},
+	}, {
+		name:   "get with a formatted release",
+		cmd:    "get elevated-turkey --template {{.Release.Chart.Metadata.Version}}",
+		golden: "output/get-release-template.txt",
+		rels:   []*release.Release{release.Mock(&release.MockReleaseOptions{Name: "elevated-turkey"})},
 	}, {
 		name:      "get requires release name arg",
 		cmd:       "get",

cmd/helm/testdata/output/get-release-template.txt

@@ -0,0 +1 @@
+0.1.0-beta.1