Refactor mapping rules.

internal/mappingrules/mapping_rule_latched.go

@@ -0,0 +1,32 @@
+package mappingrules
+
+import "github.com/holoplot/go-evdev"
+
+type MappingRuleLatched struct {
+	MappingRuleBase
+	Input RuleTarget
+	State bool
+}
+
+func (rule *MappingRuleLatched) MatchEvent(device *evdev.InputDevice, event *evdev.InputEvent, mode *string) *evdev.InputEvent {
+	if !rule.MappingRuleBase.modeCheck(mode) {
+		return nil
+	}
+
+	if device != rule.Input.GetDevice() ||
+		event.Code != rule.Input.GetCode() ||
+		rule.Input.NormalizeValue(event.Value) == 0 {
+		return nil
+	}
+
+	// Input is pressed, so toggle state and emit event
+	var value int32
+	rule.State = !rule.State
+	if rule.State {
+		value = 1
+	} else {
+		value = 0
+	}
+
+	return rule.Output.CreateEvent(value, mode)
+}