added CLI flags and params

Makefile

@@ -1,2 +1,4 @@
 build:
 	./build.sh
+install:
+	./install.sh

README.md

@@ -1,7 +1,7 @@
 getpod
 ======
 
-Address pods quickly without using the clipboard or listing all pods first. Here's a typical use case:
+Access pods quickly without using the clipboard or listing all pods first. Here's a typical use case:
 
 ```
 $ kubectl logs `getpod kube-proxy` -f
@@ -27,10 +27,20 @@ Why not just a shell script? Because it may not work on Windows. It is hard to o
 
 ## Usage
 ```
-getpod [-kubeconfig PATH] POD
+$ getpod -h
+Usage: getpod [-kubeconfig=PATH] [-a] [-n NAMESPACE] REGEX
+  -a	return all matching pods
+  -kubeconfig string
+    	(optional) absolute path to the kubeconfig file (default "/Users/gerald/.kube/config")
+  -n string
+    	namespace
 ```
 
+The search expression is interpreted in line with the Golang `regexp` package (sadly not PCRE).
+
 ## Build
 ```
-make
+$ make
+$ sudo make install
 ```
+

build.sh

@@ -5,4 +5,5 @@ GO111MODULE="on"
 go mod download
 go get
 go vet
+go test -v -cover
 go build -o getpod .

install.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cp getpod /usr/local/bin/

kube_api.go

@@ -8,8 +8,8 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 )
 
-func getPods(kubeconfig *string) []string {
-	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
+func getPods(kubeconfig string, namespace string) []string {
+	config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
 	if err != nil {
 		panic(err.Error())
 	}
@@ -21,12 +21,14 @@ func getPods(kubeconfig *string) []string {
 	}
 
 	// fetch current namespace
-	currentNamespace, err := extractCurrentNamespaceFromFile(*kubeconfig)
-	if err != nil {
-		panic(err.Error())
+	if len(namespace) == 0 {
+		namespace, err = extractCurrentNamespaceFromFile(kubeconfig)
+		if err != nil {
+			panic(err.Error())
+		}
 	}
 
-	pods, err := clientset.CoreV1().Pods(currentNamespace).List(metav1.ListOptions{})
+	pods, err := clientset.CoreV1().Pods(namespace).List(metav1.ListOptions{})
 	if err != nil {
 		panic(err.Error())
 	}

main.go

@@ -5,39 +5,56 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"strings"
+	"regexp"
 )
 
 func main() {
+	// usage
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr,
-			`Usage: %s [-kubeconfig=PATH] PODNAME`,
+			"Usage: %s [-kubeconfig=PATH] [-a] [-n NAMESPACE] REGEX\n",
 			filepath.Base(os.Args[0]))
 		flag.PrintDefaults()
 		os.Exit(0)
 	}
+
+	// flags
 	var kubeconfig *string
 	if home := homeDir(); home != "" {
-		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
+		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "absolute path to the kubeconfig file")
 	} else {
 		kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
 	}
-
+	all := flag.Bool("a", false, "return all matching pods")
+	namespace := flag.String("n", "", "namespace")
 	flag.Parse()
 
+	// params
 	args := flag.Args()
 	if len(args) == 0 {
 		fmt.Fprintf(os.Stderr, "No search expression given\n")
-		os.Exit(0)
+		flag.Usage()
+		os.Exit(1)
 	}
 
 	search := args[0]
+	re, err := regexp.Compile(search)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Invalid regular expression '%s'\n", search)
+		os.Exit(2)
+	}
 
-	names := getPods(kubeconfig)
+	names := getPods(*kubeconfig, *namespace)
 
-	for _, name := range names {
-		if strings.Contains(name, search) {
+	for i, name := range names {
+		if re.MatchString(name) {
+			if i > 0 {
+				fmt.Printf(" ")
+			}
 			fmt.Printf(name)
+			if *all == false {
+				break
+			}
 		}
 	}
 }

namespace_test.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestExtractCurrentNamespace(t *testing.T) {
+	kubeconfig := []byte(`apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority: /Users/gerald/.minikube/ca.crt
+    server: https://192.168.99.100:8443
+  name: 192-168-99-100:8443
+- cluster:
+    certificate-authority: /Users/gerald/.minikube/ca.crt
+    server: https://192.168.99.100:8443
+  name: minikube
+contexts:
+- context:
+    cluster: 192-168-99-100:8443
+    namespace: default
+    user: /192-168-99-100:8443
+  name: default/192-168-99-100:8443/
+- context:
+    cluster: minikube
+    namespace: kube-system
+    user: minikube
+  name: minikube
+current-context: minikube
+kind: Config
+preferences: {}
+users:
+- name: /192-168-99-100:8443
+  user:
+    client-certificate: /Users/gerald/.minikube/client.crt
+    client-key: /Users/gerald/.minikube/client.key
+- name: minikube
+  user:
+    client-certificate: /Users/gerald/.minikube/client.crt
+    client-key: /Users/gerald/.minikube/client.key
+`)
+	namespace, err := extractCurrentNamespace(kubeconfig)
+
+	if err != nil {
+		t.Errorf("Must accept valid kubeconfig: %v", err)
+		return
+	}
+
+	expected := "kube-system"
+	if namespace != "kube-system" {
+		t.Errorf("Expected namespace %s, got %s", expected, namespace)
+	}
+}