feat(cli): implement helm deployment list

Closes #243

cmd/helm/deployment.go

@@ -17,18 +17,24 @@ limitations under the License.
 package main
 
 import (
+	"errors"
+	"regexp"
+
 	"github.com/codegangsta/cli"
+	"github.com/kubernetes/helm/pkg/format"
 )
 
 func init() {
+	//addCommands(listCmd())
 	addCommands(deploymentCommands())
 }
 
 func deploymentCommands() cli.Command {
 	return cli.Command{
 		// Names following form prescribed here: http://is.gd/QUSEOF
-		Name:  "deployment",
-		Usage: "Perform deployment-centered operations.",
+		Name:    "deployment",
+		Aliases: []string{"dep"},
+		Usage:   "Perform deployment-centered operations.",
 		Subcommands: []cli.Command{
 			{
 				Name:      "config",
@@ -50,7 +56,46 @@ func deploymentCommands() cli.Command {
 				Name:      "list",
 				Usage:     "list all deployments, or filter by an optional pattern",
 				ArgsUsage: "PATTERN",
+				Action:    func(c *cli.Context) { run(c, list) },
 			},
 		},
 	}
 }
+
+func listCmd() cli.Command {
+	return cli.Command{
+		Name:   "list",
+		Usage:  "Lists the deployments in the cluster",
+		Action: func(c *cli.Context) { run(c, list) },
+	}
+}
+
+func list(c *cli.Context) error {
+	list, err := NewClient(c).ListDeployments()
+	if err != nil {
+		return err
+	}
+	args := c.Args()
+	if len(args) >= 1 {
+		pattern := args[0]
+		r, err := regexp.Compile(pattern)
+		if err != nil {
+			return err
+		}
+
+		newlist := []string{}
+		for _, i := range list {
+			if r.MatchString(i) {
+				newlist = append(newlist, i)
+			}
+		}
+		list = newlist
+	}
+
+	if len(list) == 0 {
+		return errors.New("no deployments found")
+	}
+
+	format.List(list)
+	return nil
+}

cmd/helm/helm.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/codegangsta/cli"
 	"github.com/kubernetes/helm/pkg/client"
+	"github.com/kubernetes/helm/pkg/format"
 	"github.com/kubernetes/helm/pkg/version"
 )
 
@@ -30,6 +31,12 @@ func init() {
 	addCommands(cmds()...)
 }
 
+// Debug indicates whether the process is in debug mode.
+//
+// This is set at app start-up time, based on the presence of the --debug
+// flag.
+var Debug bool
+
 func main() {
 	app := cli.NewApp()
 	app.Name = "helm"
@@ -55,6 +62,10 @@ func main() {
 			Usage: "Enable verbose debugging output",
 		},
 	}
+	app.Before = func(c *cli.Context) error {
+		Debug = c.GlobalBool("debug")
+		return nil
+	}
 	app.Run(os.Args)
 }
 
@@ -72,7 +83,7 @@ func addCommands(cmds ...cli.Command) {
 
 func run(c *cli.Context, f func(c *cli.Context) error) {
 	if err := f(c); err != nil {
-		os.Stderr.Write([]byte(err.Error()))
+		format.Err(err)
 		os.Exit(1)
 	}
 }
@@ -80,7 +91,6 @@ func run(c *cli.Context, f func(c *cli.Context) error) {
 // NewClient creates a new client instance preconfigured for CLI usage.
 func NewClient(c *cli.Context) *client.Client {
 	host := c.GlobalString("host")
-	debug := c.GlobalBool("debug")
 	timeout := c.GlobalInt("timeout")
-	return client.NewClient(host).SetDebug(debug).SetTimeout(timeout)
+	return client.NewClient(host).SetDebug(Debug).SetTimeout(timeout)
 }

pkg/format/messages.go

@@ -17,41 +17,77 @@ limitations under the License.
 package format
 
 import (
+	"bytes"
 	"fmt"
+	"io"
 	"os"
+	"reflect"
+	"sort"
 
 	"github.com/ghodss/yaml"
 )
 
+// Stdout is the output this library will write to.
+var Stdout io.Writer = os.Stdout
+
+// Stderr is the error output this library will write to.
+var Stderr io.Writer = os.Stderr
+
 // This is all just placeholder.
 
 // Err prints an error message to Stderr.
-func Err(msg string, v ...interface{}) {
+func Err(message interface{}, v ...interface{}) {
+	var msg string
+	val := reflect.Indirect(reflect.ValueOf(message))
+	if val.Kind() == reflect.String {
+		msg = message.(string)
+	} else if z, ok := message.(fmt.Stringer); ok {
+		msg = z.String()
+	} else if z, ok := message.(error); ok {
+		msg = z.Error()
+	}
+
 	msg = "[ERROR] " + msg + "\n"
-	fmt.Fprintf(os.Stderr, msg, v...)
+	fmt.Fprintf(Stderr, msg, v...)
 }
 
 // Info prints an informational message to Stdout.
 func Info(msg string, v ...interface{}) {
 	msg = "[INFO] " + msg + "\n"
-	fmt.Fprintf(os.Stdout, msg, v...)
+	fmt.Fprintf(Stdout, msg, v...)
 }
 
 // Msg prints a raw message to Stdout.
 func Msg(msg string, v ...interface{}) {
-	fmt.Fprintf(os.Stdout, msg, v...)
+	fmt.Fprintf(Stdout, msg, v...)
 }
 
 // Success is an achievement marked by pretty output.
 func Success(msg string, v ...interface{}) {
 	msg = "[Success] " + msg + "\n"
-	fmt.Fprintf(os.Stdout, msg, v...)
+	fmt.Fprintf(Stdout, msg, v...)
 }
 
 // Warning emits a warning message.
 func Warning(msg string, v ...interface{}) {
 	msg = "[Warning] " + msg + "\n"
-	fmt.Fprintf(os.Stdout, msg, v...)
+	fmt.Fprintf(Stdout, msg, v...)
+}
+
+// List prints a list of strings to Stdout.
+//
+// This sorts lexicographically.
+func List(list []string) {
+	sort.Strings(list)
+	// Buffer and then flush all at once to avoid concurrency-based interleaving.
+	var b bytes.Buffer
+	for _, v := range list {
+		if v == "" {
+			v = "[empty]"
+		}
+		fmt.Fprintf(&b, "%s\n", v)
+	}
+	Stdout.Write(b.Bytes())
 }
 
 // YAML prints an object in YAML format.

pkg/format/messages_test.go

@@ -14,29 +14,23 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package main
+package format
 
 import (
-	"github.com/codegangsta/cli"
-	"github.com/kubernetes/helm/pkg/format"
+	"bytes"
+	"os"
+	"testing"
 )
 
-func init() {
-	addCommands(listCmd())
-}
-
-func listCmd() cli.Command {
-	return cli.Command{
-		Name:   "list",
-		Usage:  "Lists the deployments in the cluster",
-		Action: func(c *cli.Context) { run(c, list) },
-	}
-}
+func TestList(t *testing.T) {
+	var b bytes.Buffer
+	in := []string{"ddd", "ccc", "aaa", "bbb"}
+	expect := "aaa\nbbb\nccc\nddd\n"
+	Stdout = &b
+	defer func() { Stdout = os.Stdout }()
 
-func list(c *cli.Context) error {
-	list, err := NewClient(c).ListDeployments()
-	if err != nil {
-		return err
+	List(in)
+	if b.String() != expect {
+		t.Errorf("Expected %q, got %q", expect, b.String())
 	}
-	return format.YAML(list)
 }