Merge pull request #316 from HarrisonWAffel/check-for-no-servers

Display message when no servers are available

cmd/server.go

@@ -83,6 +83,10 @@ func serverDelete(ctx *cli.Context) error {
 		return err
 	}
 
+	if err := validateServersConfig(cf); err != nil {
+		return err
+	}
+
 	var serverName string
 	if ctx.NArg() == 1 {
 		serverName = ctx.Args().First()
@@ -114,6 +118,10 @@ func serverLs(ctx *cli.Context) error {
 		return err
 	}
 
+	if err := validateServersConfig(cf); err != nil {
+		return err
+	}
+
 	writer := NewTableWriter([][]string{
 		{"CURRENT", "Current"},
 		{"NAME", "Name"},
@@ -144,6 +152,10 @@ func serverSwitch(ctx *cli.Context) error {
 		return err
 	}
 
+	if err := validateServersConfig(cf); err != nil {
+		return err
+	}
+
 	var serverName string
 	if ctx.NArg() == 1 {
 		serverName = ctx.Args().First()
@@ -238,3 +250,10 @@ func getServerNames(cf config.Config) []string {
 	sort.Strings(serverNames)
 	return serverNames
 }
+
+func validateServersConfig(cnf config.Config) error {
+	if len(cnf.Servers) == 0 {
+		return errors.New("no servers are currently configured")
+	}
+	return nil
+}