/
cobrautil.go
72 lines (61 loc) · 1.81 KB
/
cobrautil.go
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package cobrautil
import (
"fmt"
"strings"
"github.com/jzelinskie/stringz"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
// IsBuiltinCommand checks against a hard-coded list of the names of commands
// that cobra provides out-of-the-box.
func IsBuiltinCommand(cmd *cobra.Command) bool {
return stringz.SliceContains([]string{
"help [command]",
"completion [command]",
},
cmd.Use,
)
}
// SyncViperPreRunE returns a Cobra run func that synchronizes Viper environment
// flags prefixed with the provided argument.
//
// Thanks to Carolyn Van Slyck: https://github.com/carolynvs/stingoftheviper
func SyncViperPreRunE(prefix string) CobraRunFunc {
prefix = strings.ReplaceAll(strings.ToUpper(prefix), "-", "_")
return func(cmd *cobra.Command, args []string) error {
if IsBuiltinCommand(cmd) {
return nil // No-op for builtins
}
v := viper.New()
v.AllowEmptyEnv(true)
viper.SetEnvPrefix(prefix)
cmd.Flags().VisitAll(func(f *pflag.Flag) {
suffix := strings.ToUpper(strings.ReplaceAll(f.Name, "-", "_"))
_ = v.BindEnv(f.Name, prefix+"_"+suffix)
if !f.Changed && v.IsSet(f.Name) {
val := v.Get(f.Name)
_ = cmd.Flags().Set(f.Name, fmt.Sprintf("%v", val))
}
})
return nil
}
}
// CobraRunFunc is the signature of cobra.Command RunFuncs.
type CobraRunFunc func(cmd *cobra.Command, args []string) error
// RunFuncStack chains together a collection of CobraCommandFuncs into one.
func CommandStack(cmdfns ...CobraRunFunc) CobraRunFunc {
return func(cmd *cobra.Command, args []string) error {
for _, cmdfn := range cmdfns {
if err := cmdfn(cmd, args); err != nil {
return err
}
}
return nil
}
}
func prefixJoiner(prefix string) func(...string) string {
return func(xs ...string) string {
return stringz.Join("-", append([]string{prefix}, xs...)...)
}
}