Add git difftool support (keybinding <c-t>)

docs/keybindings/Keybindings_en.md

@@ -17,6 +17,7 @@ _This file is auto-generated. To update, make the changes in the pkg/i18n direct
   <kbd>ctrl+s</kbd>: view filter-by-path options
   <kbd>W</kbd>: open diff menu
   <kbd>ctrl+e</kbd>: open diff menu
+  <kbd>ctrl+t</kbd>: Launch git difftool
   <kbd>@</kbd>: open command log menu
   <kbd>}</kbd>: Increase the size of the context shown around changes in the diff view
   <kbd>{</kbd>: Decrease the size of the context shown around changes in the diff view

docs/keybindings/Keybindings_nl.md

@@ -17,6 +17,7 @@ _This file is auto-generated. To update, make the changes in the pkg/i18n direct
   <kbd>ctrl+s</kbd>: bekijk scoping opties
   <kbd>W</kbd>: open diff menu
   <kbd>ctrl+e</kbd>: open diff menu
+  <kbd>ctrl+t</kbd>: Launch git difftool
   <kbd>@</kbd>: open command log menu
   <kbd>}</kbd>: Increase the size of the context shown around changes in the diff view
   <kbd>{</kbd>: Decrease the size of the context shown around changes in the diff view

docs/keybindings/Keybindings_pl.md

@@ -17,6 +17,7 @@ _This file is auto-generated. To update, make the changes in the pkg/i18n direct
   <kbd>ctrl+s</kbd>: view filter-by-path options
   <kbd>W</kbd>: open diff menu
   <kbd>ctrl+e</kbd>: open diff menu
+  <kbd>ctrl+t</kbd>: Launch git difftool
   <kbd>@</kbd>: open command log menu
   <kbd>}</kbd>: Increase the size of the context shown around changes in the diff view
   <kbd>{</kbd>: Decrease the size of the context shown around changes in the diff view

docs/keybindings/Keybindings_zh.md

@@ -17,6 +17,7 @@ _This file is auto-generated. To update, make the changes in the pkg/i18n direct
   <kbd>ctrl+s</kbd>: 查看按路径过滤选项
   <kbd>W</kbd>: 打开 diff 菜单
   <kbd>ctrl+e</kbd>: 打开 diff 菜单
+  <kbd>ctrl+t</kbd>: Launch git difftool
   <kbd>@</kbd>: 打开命令日志菜单
   <kbd>}</kbd>: 扩大差异视图中显示的上下文范围
   <kbd>{</kbd>: 缩小差异视图中显示的上下文范围

pkg/config/user_config.go

@@ -189,6 +189,7 @@ type KeybindingUniversalConfig struct {
 	FilteringMenu                string   `yaml:"filteringMenu"`
 	DiffingMenu                  string   `yaml:"diffingMenu"`
 	DiffingMenuAlt               string   `yaml:"diffingMenu-alt"`
+	DiffTool                     string   `yaml:"difftool"`
 	CopyToClipboard              string   `yaml:"copyToClipboard"`
 	OpenRecentRepos              string   `yaml:"openRecentRepos"`
 	SubmitEditorText             string   `yaml:"submitEditorText"`
@@ -473,6 +474,7 @@ func GetDefaultConfig() *UserConfig {
 				FilteringMenu:                "<c-s>",
 				DiffingMenu:                  "W",
 				DiffingMenuAlt:               "<c-e>",
+				DiffTool:                     "<c-t>",
 				CopyToClipboard:              "<c-o>",
 				SubmitEditorText:             "<enter>",
 				AppendNewline:                "<a-enter>",

pkg/gui/diffing.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
 	"github.com/jesseduffield/lazygit/pkg/gui/context"
 	"github.com/jesseduffield/lazygit/pkg/gui/modes/diffing"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
@@ -159,3 +160,35 @@ func (gui *Gui) handleCreateDiffingMenuPanel() error {
 
 	return gui.c.Menu(types.CreateMenuOptions{Title: gui.c.Tr.DiffingMenuTitle, Items: menuItems})
 }
+
+func (gui *Gui) handleLaunchDiffTool() error {
+	gui.c.LogAction("Launch DiffTool")
+
+	cmdStr := "git difftool --submodule "
+
+	file := gui.currentlySelectedFilename()
+	if file == "" || oscommands.FileType(file) == "directory" {
+		cmdStr += "-d "
+	} else {
+		cmdStr += "-y "
+	}
+
+	if gui.State.Modes.Diffing.Active() {
+		cmdStr += gui.diffStr()
+	} else {
+		diffTerm := gui.currentDiffTerminal()
+		if diffTerm != "" {
+			cmdStr += fmt.Sprintf(" %s^ %s", diffTerm, diffTerm)
+		}
+	}
+
+	if file != "" {
+		cmdStr += " -- " + file
+	}
+
+	gui.c.LogCommand(cmdStr, true)
+
+	osCmd := gui.os.Cmd.New(cmdStr)
+
+	return osCmd.GetCmd().Start()
+}

pkg/gui/keybindings.go

@@ -294,6 +294,12 @@ func (self *Gui) GetInitialKeybindings() ([]*types.Binding, []*gocui.ViewMouseBi
 			Description: self.c.Tr.LcOpenDiffingMenu,
 			OpensMenu:   true,
 		},
+		{
+			ViewName:    "",
+			Key:         opts.GetKey(opts.Config.Universal.DiffTool),
+			Handler:     self.handleLaunchDiffTool,
+			Description: self.c.Tr.LcLaunchDiffTool,
+		},
 		{
 			ViewName:    "",
 			Key:         opts.GetKey(opts.Config.Universal.ExtrasMenu),

pkg/i18n/english.go

@@ -390,6 +390,7 @@ type TranslationSet struct {
 	DiffingMenuTitle                    string
 	LcSwapDiff                          string
 	LcOpenDiffingMenu                   string
+	LcLaunchDiffTool                    string
 	LcOpenExtrasMenu                    string
 	LcShowingGitDiff                    string
 	LcCommitDiff                        string
@@ -1027,6 +1028,7 @@ func EnglishTranslationSet() TranslationSet {
 		DiffingMenuTitle:                    "Diffing",
 		LcSwapDiff:                          "reverse diff direction",
 		LcOpenDiffingMenu:                   "open diff menu",
+		LcLaunchDiffTool:                    "Launch git difftool",
 		// the actual view is the extras view which I intend to give more tabs in future but for now we'll only mention the command log part
 		LcOpenExtrasMenu:                    "open command log menu",
 		LcShowingGitDiff:                    "showing output for:",