refactor to make code clearer

pkg/gui/controllers/switch_to_diff_files_controller.go

@@ -0,0 +1,74 @@
+package controllers
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+)
+
+// This controller is for all contexts that contain commit files.
+
+var _ types.IController = &SwitchToDiffFilesController{}
+
+type CanSwitchToDiffFiles interface {
+	types.Context
+	CanRebase() bool
+	GetSelectedRefName() string
+}
+
+type SwitchToDiffFilesController struct {
+	baseController
+	*controllerCommon
+	context   CanSwitchToDiffFiles
+	viewFiles func(SwitchToCommitFilesContextOpts) error
+}
+
+func NewSwitchToDiffFilesController(
+	controllerCommon *controllerCommon,
+	viewFiles func(SwitchToCommitFilesContextOpts) error,
+	context CanSwitchToDiffFiles,
+) *SwitchToDiffFilesController {
+	return &SwitchToDiffFilesController{
+		baseController:   baseController{},
+		controllerCommon: controllerCommon,
+		context:          context,
+		viewFiles:        viewFiles,
+	}
+}
+
+func (self *SwitchToDiffFilesController) GetKeybindings(opts types.KeybindingsOpts) []*types.Binding {
+	bindings := []*types.Binding{
+		{
+			Key:         opts.GetKey(opts.Config.Universal.GoInto),
+			Handler:     self.checkSelected(self.enter),
+			Description: self.c.Tr.LcViewItemFiles,
+		},
+	}
+
+	return bindings
+}
+
+func (self *SwitchToDiffFilesController) GetOnClick() func() error {
+	return self.checkSelected(self.enter)
+}
+
+func (self *SwitchToDiffFilesController) checkSelected(callback func(string) error) func() error {
+	return func() error {
+		refName := self.context.GetSelectedRefName()
+		if refName == "" {
+			return nil
+		}
+
+		return callback(refName)
+	}
+}
+
+func (self *SwitchToDiffFilesController) enter(refName string) error {
+	return self.viewFiles(SwitchToCommitFilesContextOpts{
+		RefName:   refName,
+		CanRebase: self.context.CanRebase(),
+		Context:   self.context,
+	})
+}
+
+func (self *SwitchToDiffFilesController) Context() types.Context {
+	return self.context
+}