move diffing menu action to controller

pkg/gui/controllers/diffing_menu_action.go

@@ -0,0 +1,69 @@
+package controllers
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/jesseduffield/lazygit/pkg/gui/modes/diffing"
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+)
+
+type DiffingMenuAction struct {
+	c *ControllerCommon
+}
+
+func (self *DiffingMenuAction) Call() error {
+	names := self.c.Helpers().Diff.CurrentDiffTerminals()
+
+	menuItems := []*types.MenuItem{}
+	for _, name := range names {
+		name := name
+		menuItems = append(menuItems, []*types.MenuItem{
+			{
+				Label: fmt.Sprintf("%s %s", self.c.Tr.LcDiff, name),
+				OnPress: func() error {
+					self.c.Modes().Diffing.Ref = name
+					// can scope this down based on current view but too lazy right now
+					return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
+				},
+			},
+		}...)
+	}
+
+	menuItems = append(menuItems, []*types.MenuItem{
+		{
+			Label: self.c.Tr.LcEnterRefToDiff,
+			OnPress: func() error {
+				return self.c.Prompt(types.PromptOpts{
+					Title:               self.c.Tr.LcEnteRefName,
+					FindSuggestionsFunc: self.c.Helpers().Suggestions.GetRefsSuggestionsFunc(),
+					HandleConfirm: func(response string) error {
+						self.c.Modes().Diffing.Ref = strings.TrimSpace(response)
+						return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
+					},
+				})
+			},
+		},
+	}...)
+
+	if self.c.Modes().Diffing.Active() {
+		menuItems = append(menuItems, []*types.MenuItem{
+			{
+				Label: self.c.Tr.LcSwapDiff,
+				OnPress: func() error {
+					self.c.Modes().Diffing.Reverse = !self.c.Modes().Diffing.Reverse
+					return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
+				},
+			},
+			{
+				Label: self.c.Tr.LcExitDiffMode,
+				OnPress: func() error {
+					self.c.Modes().Diffing = diffing.New()
+					return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
+				},
+			},
+		}...)
+	}
+
+	return self.c.Menu(types.CreateMenuOptions{Title: self.c.Tr.DiffingMenuTitle, Items: menuItems})
+}