Merge pull request #454 from brendandburns/template

Add a template printer to kubecfg.

cmd/kubecfg/kubecfg.go

@@ -24,6 +24,7 @@ import (
 	"os"
 	"strconv"
 	"strings"
+	"text/template"
 	"time"
 
 	kube_client "github.com/GoogleCloudPlatform/kubernetes/pkg/client"
@@ -50,6 +51,8 @@ var (
 	verbose      = flag.Bool("verbose", false, "If true, print extra information")
 	proxy        = flag.Bool("proxy", false, "If true, run a proxy to the api server")
 	www          = flag.String("www", "", "If -proxy is true, use this directory to serve static files")
+	templateFile = flag.String("template_file", "", "If present load this file as a golang template and us it for output printing")
+	templateStr  = flag.String("template", "", "If present parse this string as a golang template and us it for output printing")
 )
 
 func usage() {
@@ -184,11 +187,32 @@ func executeAPIRequest(method string, s *kube_client.Client) bool {
 	}
 
 	var printer kubecfg.ResourcePrinter
-	if *json {
+	switch {
+	case *json:
 		printer = &kubecfg.IdentityPrinter{}
-	} else if *yaml {
+	case *yaml:
 		printer = &kubecfg.YAMLPrinter{}
-	} else {
+	case len(*templateFile) > 0 || len(*templateStr) > 0:
+		var data []byte
+		if len(*templateFile) > 0 {
+			var err error
+			data, err = ioutil.ReadFile(*templateFile)
+			if err != nil {
+				glog.Fatalf("Error reading template %s, %v\n", *templateFile, err)
+				return false
+			}
+		} else {
+			data = []byte(*templateStr)
+		}
+		tmpl, err := template.New("output").Parse(string(data))
+		if err != nil {
+			glog.Fatalf("Error parsing template %s, %v\n", string(data), err)
+			return false
+		}
+		printer = &kubecfg.TemplatePrinter{
+			Template: tmpl,
+		}
+	default:
 		printer = &kubecfg.HumanReadablePrinter{}
 	}
 

pkg/kubecfg/resource_printer.go

@@ -22,6 +22,7 @@ import (
 	"io"
 	"strings"
 	"text/tabwriter"
+	"text/template"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
@@ -235,3 +236,19 @@ func (h *HumanReadablePrinter) PrintObj(obj interface{}, output io.Writer) error
 		return err
 	}
 }
+
+type TemplatePrinter struct {
+	Template *template.Template
+}
+
+func (t *TemplatePrinter) Print(data []byte, w io.Writer) error {
+	obj, err := api.Decode(data)
+	if err != nil {
+		return err
+	}
+	return t.PrintObj(obj, w)
+}
+
+func (t *TemplatePrinter) PrintObj(obj interface{}, w io.Writer) error {
+	return t.Template.Execute(w, obj)
+}