package env import ( "context" "strings" "github.com/micro/go-micro/v3/config/source" ) type strippedPrefixKey struct{} type prefixKey struct{} // WithStrippedPrefix sets the environment variable prefixes to scope to. // These prefixes will be removed from the actual config entries. func WithStrippedPrefix(p ...string) source.Option { return func(o *source.Options) { if o.Context == nil { o.Context = context.Background() } o.Context = context.WithValue(o.Context, strippedPrefixKey{}, appendUnderscore(p)) } } // WithPrefix sets the environment variable prefixes to scope to. // These prefixes will not be removed. Each prefix will be considered a top level config entry. func WithPrefix(p ...string) source.Option { return func(o *source.Options) { if o.Context == nil { o.Context = context.Background() } o.Context = context.WithValue(o.Context, prefixKey{}, appendUnderscore(p)) } } func appendUnderscore(prefixes []string) []string { //nolint:prealloc var result []string for _, p := range prefixes { if !strings.HasSuffix(p, "_") { result = append(result, p+"_") continue } result = append(result, p) } return result }