feat(*): add doctor cmd

cmd/doctor.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/deis/helm-dm/dm"
+	"github.com/deis/helm-dm/kubectl"
+)
+
+func doctor() error {
+	var runner kubectl.Runner
+	runner = &kubectl.RealRunner{}
+	if dm.IsInstalled(runner) {
+		format.Success("You have everything you need. Go forth my friend!")
+	} else {
+		format.Warning("Looks like you don't have DM installed.\nRun: `helm install`")
+	}
+
+	return nil
+}

cmd/helm/helm.go

@@ -67,7 +67,15 @@ func commands() []cli.Command {
 			},
 		},
 		{
-			Name: "doctor",
+			Name:      "doctor",
+			Usage:     "Run a series of checks for necessary prerequisites.",
+			ArgsUsage: "",
+			Action: func(c *cli.Context) {
+				if err := doctor(); err != nil {
+					format.Error("%s", err)
+					os.Exit(1)
+				}
+			},
 		},
 		{
 			Name:    "deploy",

format/messages.go

@@ -20,3 +20,13 @@ func Info(msg string, v ...interface{}) {
 func Msg(msg string, v ...interface{}) {
 	fmt.Fprintf(os.Stdout, msg, v...)
 }
+
+func Success(msg string, v ...interface{}) {
+	msg = "[Success] " + msg + "\n"
+	fmt.Fprintf(os.Stdout, msg, v...)
+}
+
+func Warning(msg string, v ...interface{}) {
+	msg = "[Warning] " + msg + "\n"
+	fmt.Fprintf(os.Stdout, msg, v...)
+}