move commit files context into new structure

pkg/gui/context/commit_files_context.go

@@ -0,0 +1,68 @@
+package context
+
+import (
+	"github.com/jesseduffield/gocui"
+	"github.com/jesseduffield/lazygit/pkg/commands/models"
+	"github.com/jesseduffield/lazygit/pkg/gui/filetree"
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+)
+
+type CommitFilesContext struct {
+	*filetree.CommitFileTreeViewModel
+	*BaseContext
+	*ListContextTrait
+}
+
+var _ types.IListContext = (*CommitFilesContext)(nil)
+
+func NewCommitFilesContext(
+	getModel func() []*models.CommitFile,
+	getView func() *gocui.View,
+	getDisplayStrings func(startIdx int, length int) [][]string,
+
+	onFocus func(...types.OnFocusOpts) error,
+	onRenderToMain func(...types.OnFocusOpts) error,
+	onFocusLost func() error,
+
+	c *types.ControllerCommon,
+) *CommitFilesContext {
+	baseContext := NewBaseContext(NewBaseContextOpts{
+		ViewName:   "commitFiles",
+		WindowName: "commits",
+		Key:        COMMIT_FILES_CONTEXT_KEY,
+		Kind:       types.SIDE_CONTEXT,
+	})
+
+	self := &CommitFilesContext{}
+	takeFocus := func() error { return c.PushContext(self) }
+
+	viewModel := filetree.NewCommitFileTreeViewModel(getModel, c.Log, c.UserConfig.Gui.ShowFileTree)
+	viewTrait := NewViewTrait(getView)
+	listContextTrait := &ListContextTrait{
+		base:      baseContext,
+		list:      viewModel,
+		viewTrait: viewTrait,
+
+		GetDisplayStrings: getDisplayStrings,
+		OnFocus:           onFocus,
+		OnRenderToMain:    onRenderToMain,
+		OnFocusLost:       onFocusLost,
+		takeFocus:         takeFocus,
+
+		// TODO: handle this in a trait
+		RenderSelection: false,
+
+		c: c,
+	}
+
+	self.BaseContext = baseContext
+	self.ListContextTrait = listContextTrait
+	self.CommitFileTreeViewModel = viewModel
+
+	return self
+}
+
+func (self *CommitFilesContext) GetSelectedItem() (types.ListItem, bool) {
+	item := self.CommitFileTreeViewModel.GetSelectedFileNode()
+	return item, item != nil
+}