Big Refactor (#2)

Refactor Everything.

Co-authored-by: Anna Rose Wiggins <annabunches@gmail.com>
Co-committed-by: Anna Rose Wiggins <annabunches@gmail.com>

internal/mappingrules/mapping_rule_mode_select.go

@@ -0,0 +1,40 @@
+package mappingrules
+
+import "github.com/holoplot/go-evdev"
+
+type MappingRuleModeSelect struct {
+	MappingRuleBase
+	Input  *RuleTargetButton
+	Output *RuleTargetModeSelect
+}
+
+func NewMappingRuleModeSelect(
+	base MappingRuleBase,
+	input *RuleTargetButton,
+	output *RuleTargetModeSelect,
+) *MappingRuleModeSelect {
+
+	return &MappingRuleModeSelect{
+		MappingRuleBase: base,
+		Input:           input,
+		Output:          output,
+	}
+}
+
+func (rule *MappingRuleModeSelect) MatchEvent(
+	device *evdev.InputDevice,
+	event *evdev.InputEvent,
+	mode *string) (*evdev.InputDevice, *evdev.InputEvent) {
+
+	if !rule.MappingRuleBase.modeCheck(mode) {
+		return nil, nil
+	}
+
+	if device != rule.Input.Device ||
+		event.Code != rule.Input.Button ||
+		rule.Input.NormalizeValue(event.Value) == 0 {
+		return nil, nil
+	}
+
+	return nil, rule.Output.CreateEvent(event.Value, mode)
+}