add -A flag

cluster.go

@@ -14,8 +14,9 @@ type Cluster struct {
 }
 
 // Clusters gets cluster configurations from kubeconfigs and from within a
-// cluster if running inside one.
-func Clusters(kubeconfigs []string) ([]Cluster, error) {
+// cluster if running inside one. It sets cluster.namespace to empty string
+// (which means all namespaces) if allNamespaces is true.
+func Clusters(kubeconfigs []string, allNamespaces bool) ([]Cluster, error) {
 	var clusters []Cluster
 
 	for _, kc := range kubeconfigs {
@@ -34,6 +35,12 @@ func Clusters(kubeconfigs []string) ([]Cluster, error) {
 		clusters = append(clusters, c)
 	}
 
+	if allNamespaces {
+		for i := range clusters {
+			clusters[i].namespace = ""
+		}
+	}
+
 	return clusters, nil
 }
 

flags.go

@@ -6,6 +6,7 @@ import (
 )
 
 type Flags struct {
+	allNamespaces bool
 	age           bool
 	daemon        bool
 	kind          kinds
@@ -30,6 +31,7 @@ func (k *kinds) Set(value string) error {
 func parseFlags() Flags {
 	var f Flags
 
+	flag.BoolVar(&f.allNamespaces, "A", false, "count objects across all namespaces")
 	flag.BoolVar(&f.age, "a", false, "show also age of newest and oldest object")
 	flag.BoolVar(&f.daemon, "d", false, "run as daemon exposing prometheus metrics")
 	flag.Var(&f.kind, "k", "object kind or kinds (default pod)")

main.go

@@ -15,7 +15,7 @@ func main() {
 		log.SetPrefix(os.Args[0] + ": ")
 	}
 
-	clusters, err := Clusters(flag.Args())
+	clusters, err := Clusters(flag.Args(), flags.allNamespaces)
 	if err != nil {
 		log.Fatalf("getting cluster configs: %v", err)
 	}