feat: add a hex field to Id types

Helps address issues brought up in nix-community/nixos-facter-modules#58 by introducing an additional hex field in the Id type.

Eventually, we can make this a breaking change by removing the value field and incrementing the report version.

This is a chance to test out how we can introduce breaking changes, whilst allowing module authors time to update.

Closes #141

Signed-off-by: Brian McGee <[email protected]>

Author: brianmcgee

pkg/hwinfo/id.go

@@ -73,11 +73,18 @@ func (i Id) MarshalJSON() ([]byte, error) {
 	case IdTagSpecial:
 		return json.Marshal(i.Name)
 	default:
+		var hex string
+		if i.Type > 0 {
+			hex = fmt.Sprintf("%04x", i.Value)
+		}
+
 		return json.Marshal(struct {
 			Name  string `json:"name,omitempty"`
+			Hex   string `json:"hex,omitempty"`
 			Value uint16 `json:"value"`
 		}{
 			Name:  i.Name,
+			Hex:   hex,
 			Value: i.Value,
 		})
 	}