feat(cmd): add 'namespace' command for easy namespace switching (#26)

.conform.yaml

@@ -18,7 +18,6 @@ policies:
           - style
           - test
         scopes:
-          - "*"
           - cmd
           - pkg
           - build

cmd/namespace.go

@@ -0,0 +1,50 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/cobra"
+
+	"github.com/particledecay/kconf/pkg/kubeconfig"
+)
+
+var namespaceCmd = &cobra.Command{
+	Use:     "namespace",
+	Short:   "Set preferred namespace",
+	Long:    `Set the preferred namespace within the current context`,
+	Aliases: []string{"ns"},
+	Args: func(cmd *cobra.Command, args []string) error {
+		if len(args) < 1 {
+			return errors.New("You must provide the name of a namespace within the current context")
+		}
+		return nil
+	},
+	Run: func(cmd *cobra.Command, args []string) {
+		namespace := args[0]
+
+		config, err := kubeconfig.GetConfig()
+		if err != nil {
+			log.Fatal().Msgf("Could not read main config")
+		}
+
+		// fail if we have no current context
+		if config.CurrentContext == "" {
+			log.Fatal().Msgf("No current context detected. You must set one first with the `use` command.")
+		}
+
+		err = config.SetNamespace(config.CurrentContext, namespace)
+		if err != nil {
+			log.Fatal().Msgf("%v", err)
+		}
+		if namespace != "" {
+			fmt.Printf("Setting preferred namespace '%s'\n", namespace)
+		}
+
+		err = config.Save()
+		if err != nil {
+			log.Fatal().Msgf("%v", err)
+		}
+	},
+}

cmd/root.go

@@ -42,6 +42,7 @@ func Execute() {
 	rootCmd.AddCommand(viewCmd)
 	rootCmd.AddCommand(useCmd)
 	rootCmd.AddCommand(versionCmd)
+	rootCmd.AddCommand(namespaceCmd)
 	rootCmd.AddCommand(completionCmd)
 
 	completionCmd.AddCommand(completionBashCmd)