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package util
import (
"encoding/json"
"fmt"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
)
// MarshalAndDeleteEmpty marshals a JSON object, then uses gjson to delete empty objects at the given gjson paths.
//
// This can be used as a convenient way to create a marshaler that omits empty non-pointer structs.
// See mautrix.RespSync for example.
func MarshalAndDeleteEmpty(marshalable interface{}, paths []string) ([]byte, error) {
data, err := json.Marshal(marshalable)
if err != nil {
return nil, err
}
for _, path := range paths {
res := gjson.GetBytes(data, path)
if res.IsObject() && len(res.Raw) == 2 {
data, err = sjson.DeleteBytes(data, path)
if err != nil {
return nil, fmt.Errorf("failed to delete empty %s: %w", path, err)
}
}
}
return data, nil
}
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