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flag.go
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flag.go
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package flag
import (
"encoding/json"
"strings"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"github.com/giantswarm/microerror"
)
func Init(f interface{}) {
b, err := json.Marshal(f)
if err != nil {
panic(err)
}
var m map[string]interface{}
err = json.Unmarshal(b, &m)
if err != nil {
panic(err)
}
for k, v := range m {
m[k] = toValue([]string{strings.ToLower(k)}, k, v)
}
b, err = json.Marshal(m)
if err != nil {
panic(err)
}
err = json.Unmarshal(b, f)
if err != nil {
panic(err)
}
}
func Parse(v *viper.Viper, fs *pflag.FlagSet) {
err := v.BindPFlags(fs)
if err != nil {
panic(err)
}
}
func Merge(v *viper.Viper, fs *pflag.FlagSet, dirs, files []string) error {
// We support multiple config files. Viper cannot do that on its own. So we
// configure a new viper for each config file that we are interested in and
// merge the found configurations into the viper given by the client.
for _, f := range files {
newViper := viper.New()
newViper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
newViper.AutomaticEnv()
for _, configDir := range dirs {
newViper.AddConfigPath(configDir)
}
newViper.SetConfigName(f)
err := newViper.ReadInConfig()
if err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok { //nolint:gosimple
// In case there is no config file given we simply go ahead to check
// the other ones. If we do not find any configuration using config
// files, we go ahead to check the process environment.
} else {
return microerror.Mask(err)
}
}
fs.VisitAll(func(f *pflag.Flag) {
if newViper.IsSet(f.Name) {
v.Set(f.Name, newViper.Get(f.Name))
}
})
}
return nil
}
func toValue(path []string, key string, val interface{}) interface{} {
m, ok := val.(map[string]interface{})
if ok {
for k, v := range m {
m[k] = toValue(append([]string{strings.ToLower(k)}, path...), k, v)
}
return m
}
res := strings.Join(reverse(path), ".")
return res
}
func reverse(s []string) []string {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
return s
}