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root.go
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root.go
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package cmd
import (
"io"
"os"
"strings"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
var v string
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "azp",
Short: "Utility for purging data from Azure Storage Tables",
Long: ``,
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
logrus.Println(err)
os.Exit(1)
}
}
func setUpLogs(out io.Writer, level string) error {
logrus.SetOutput(out)
lvl, err := logrus.ParseLevel(level)
if err != nil {
return err
}
logrus.SetLevel(lvl)
return nil
}
func init() {
cobra.OnInitialize(func() {
viper.SetEnvPrefix("azp") // Set the environment prefix to AZP_*
viper.AutomaticEnv() // Automatically search for environment variables
replacer := strings.NewReplacer("-", "_")
viper.SetEnvKeyReplacer(replacer)
postInitCommands(rootCmd.Commands())
})
rootCmd.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
if err := setUpLogs(os.Stdout, v); err != nil {
return err
}
return nil
}
rootCmd.PersistentFlags().StringVarP(&v, "verbosity", "v", logrus.InfoLevel.String(), "Log level (debug, info, warn, error, fatal, panic")
}
func postInitCommands(commands []*cobra.Command) {
for _, cmd := range commands {
presetRequiredFlags(cmd)
if cmd.HasSubCommands() {
postInitCommands(cmd.Commands())
}
}
}
func presetRequiredFlags(cmd *cobra.Command) {
viper.BindPFlags(cmd.Flags())
cmd.Flags().VisitAll(func(f *pflag.Flag) {
if viper.IsSet(f.Name) && viper.GetString(f.Name) != "" {
cmd.Flags().Set(f.Name, viper.GetString(f.Name))
}
})
}