Add experimental support for bash autocomplete

cmd/basecli/commands/auto.go

@@ -0,0 +1,31 @@
+package commands
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var AutoCompleteCmd = &cobra.Command{
+	Use:   "complete",
+	Short: "generate bash autocompletions",
+	RunE:  doAutoComplete,
+}
+
+const (
+	FlagOutput = "file"
+)
+
+func init() {
+	AutoCompleteCmd.Flags().String(FlagOutput, "", "file to output bash autocompletion")
+	AutoCompleteCmd.MarkFlagFilename(FlagOutput)
+}
+
+func doAutoComplete(cmd *cobra.Command, args []string) error {
+	output := viper.GetString(FlagOutput)
+	if output == "" {
+		return cmd.Root().GenBashCompletion(os.Stdout)
+	}
+	return cmd.Root().GenBashCompletionFile(output)
+}