Introduce filtered list view model

We're going to start supporting filtering of list views

pkg/gui/controllers/search_prompt_controller.go

@@ -0,0 +1,53 @@
+package controllers
+
+import (
+	"github.com/jesseduffield/gocui"
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+)
+
+type SearchPromptController struct {
+	baseController
+	c *ControllerCommon
+}
+
+var _ types.IController = &SearchPromptController{}
+
+func NewSearchPromptController(
+	common *ControllerCommon,
+) *SearchPromptController {
+	return &SearchPromptController{
+		baseController: baseController{},
+		c:              common,
+	}
+}
+
+func (self *SearchPromptController) GetKeybindings(opts types.KeybindingsOpts) []*types.Binding {
+	return []*types.Binding{
+		{
+			Key:      opts.GetKey(opts.Config.Universal.Confirm),
+			Modifier: gocui.ModNone,
+			Handler:  self.confirm,
+		},
+		{
+			Key:      opts.GetKey(opts.Config.Universal.Return),
+			Modifier: gocui.ModNone,
+			Handler:  self.cancel,
+		},
+	}
+}
+
+func (self *SearchPromptController) Context() types.Context {
+	return self.context()
+}
+
+func (self *SearchPromptController) context() types.Context {
+	return self.c.Contexts().Search
+}
+
+func (self *SearchPromptController) confirm() error {
+	return self.c.Helpers().Search.Confirm()
+}
+
+func (self *SearchPromptController) cancel() error {
+	return self.c.Helpers().Search.CancelPrompt()
+}