Add a "Copy to clipboard" menu to the Commit Files panel

This is very similar to the same menu in the Files panel, except that it works
on whatever diff is currently shown in the main view, including range diffs
either in diffing mode (shift-W), or from a range selection of commits.

pkg/gui/controllers/commits_files_controller.go

@@ -41,6 +41,12 @@ func NewCommitFilesController(
 
 func (self *CommitFilesController) GetKeybindings(opts types.KeybindingsOpts) []*types.Binding {
 	bindings := []*types.Binding{
+		{
+			Key:         opts.GetKey(opts.Config.Files.CopyFileInfoToClipboard),
+			Handler:     self.openCopyMenu,
+			Description: self.c.Tr.CopyToClipboardMenu,
+			OpensMenu:   true,
+		},
 		{
 			Key:               opts.GetKey(opts.Config.CommitFiles.CheckoutCommitFile),
 			Handler:           self.withItem(self.checkout),
@@ -181,6 +187,77 @@ func (self *CommitFilesController) onClickMain(opts gocui.ViewMouseBindingOpts)
 	return self.enterCommitFile(node, types.OnFocusOpts{ClickedWindowName: "main", ClickedViewLineIdx: opts.Y})
 }
 
+func (self *CommitFilesController) copyDiffToClipboard(path string, toastMessage string) error {
+	from, to := self.context().GetFromAndToForDiff()
+	from, reverse := self.c.Modes().Diffing.GetFromAndReverseArgsForDiff(from)
+
+	cmdObj := self.c.Git().WorkingTree.ShowFileDiffCmdObj(from, to, reverse, path, true)
+	diff, err := cmdObj.RunWithOutput()
+	if err != nil {
+		return err
+	}
+	if err := self.c.OS().CopyToClipboard(diff); err != nil {
+		return err
+	}
+	self.c.Toast(toastMessage)
+	return nil
+}
+
+func (self *CommitFilesController) openCopyMenu() error {
+	node := self.context().GetSelected()
+
+	copyNameItem := &types.MenuItem{
+		Label: self.c.Tr.CopyFileName,
+		OnPress: func() error {
+			if err := self.c.OS().CopyToClipboard(node.Name()); err != nil {
+				return err
+			}
+			self.c.Toast(self.c.Tr.FileNameCopiedToast)
+			return nil
+		},
+		DisabledReason: self.require(self.singleItemSelected())(),
+		Key:            'n',
+	}
+	copyPathItem := &types.MenuItem{
+		Label: self.c.Tr.CopyFilePath,
+		OnPress: func() error {
+			if err := self.c.OS().CopyToClipboard(node.Path); err != nil {
+				return err
+			}
+			self.c.Toast(self.c.Tr.FilePathCopiedToast)
+			return nil
+		},
+		DisabledReason: self.require(self.singleItemSelected())(),
+		Key:            'p',
+	}
+	copyFileDiffItem := &types.MenuItem{
+		Label: self.c.Tr.CopySelectedDiff,
+		OnPress: func() error {
+			return self.copyDiffToClipboard(node.GetPath(), self.c.Tr.FileDiffCopiedToast)
+		},
+		DisabledReason: self.require(self.singleItemSelected())(),
+		Key:            's',
+	}
+	copyAllDiff := &types.MenuItem{
+		Label: self.c.Tr.CopyAllFilesDiff,
+		OnPress: func() error {
+			return self.copyDiffToClipboard(".", self.c.Tr.AllFilesDiffCopiedToast)
+		},
+		DisabledReason: self.require(self.itemsSelected())(),
+		Key:            'a',
+	}
+
+	return self.c.Menu(types.CreateMenuOptions{
+		Title: self.c.Tr.CopyToClipboardMenu,
+		Items: []*types.MenuItem{
+			copyNameItem,
+			copyPathItem,
+			copyFileDiffItem,
+			copyAllDiff,
+		},
+	})
+}
+
 func (self *CommitFilesController) checkout(node *filetree.CommitFileNode) error {
 	self.c.LogAction(self.c.Tr.Actions.CheckoutFile)
 	if err := self.c.Git().WorkingTree.CheckoutFile(self.context().GetRef().RefName(), node.GetPath()); err != nil {