1 files changed, 88 insertions, 0 deletions
diff --git a/pkg/gui/filetree/file_manager.go b/pkg/gui/filetree/file_manager.go
new file mode 100644
index 000000000..6fd688bc2
--- /dev/null
+++ b/pkg/gui/filetree/file_manager.go
@@ -0,0 +1,88 @@
+package filetree
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/commands/models"
+	"github.com/jesseduffield/lazygit/pkg/gui/presentation"
+	"github.com/sirupsen/logrus"
+)
+
+type FileManager struct {
+	files          []*models.File
+	tree           *FileNode
+	showTree       bool
+	log            *logrus.Entry
+	collapsedPaths CollapsedPaths
+}
+
+func NewFileChangeManager(files []*models.File, log *logrus.Entry, showTree bool) *FileManager {
+	return &FileManager{
+		files:          files,
+		log:            log,
+		showTree:       showTree,
+		collapsedPaths: CollapsedPaths{},
+	}
+}
+
+func (m *FileManager) ExpandToPath(path string) {
+	m.collapsedPaths.ExpandToPath(path)
+}
+
+func (m *FileManager) ToggleShowTree() {
+	m.showTree = !m.showTree
+	m.SetTree()
+}
+
+func (m *FileManager) GetItemAtIndex(index int) *FileNode {
+	// need to traverse the three depth first until we get to the index.
+	return m.tree.GetNodeAtIndex(index+1, m.collapsedPaths) // ignoring root
+}
+
+func (m *FileManager) GetIndexForPath(path string) (int, bool) {
+	index, found := m.tree.GetIndexForPath(path, m.collapsedPaths)
+	return index - 1, found
+}
+
+func (m *FileManager) GetAllItems() []*FileNode {
+	if m.tree == nil {
+		return nil
+	}
+
+	return m.tree.Flatten(m.collapsedPaths)[1:] // ignoring root
+}
+
+func (m *FileManager) GetItemsLength() int {
+	return m.tree.Size(m.collapsedPaths) - 1 // ignoring root
+}
+
+func (m *FileManager) GetAllFiles() []*models.File {
+	return m.files
+}
+
+func (m *FileManager) SetFiles(files []*models.File) {
+	m.files = files
+
+	m.SetTree()
+}
+
+func (m *FileManager) SetTree() {
+	if m.showTree {
+		m.tree = BuildTreeFromFiles(m.files)
+	} else {
+		m.tree = BuildFlatTreeFromFiles(m.files)
+	}
+}
+
+func (m *FileManager) IsCollapsed(path string) bool {
+	return m.collapsedPaths.IsCollapsed(path)
+}
+
+func (m *FileManager) ToggleCollapsed(path string) {
+	m.collapsedPaths.ToggleCollapsed(path)
+}
+
+func (m *FileManager) Render(diffName string, submoduleConfigs []*models.SubmoduleConfig) []string {
+	return renderAux(m.tree, m.collapsedPaths, "", -1, func(n INode, depth int) string {
+		castN := n.(*FileNode)
+		return presentation.GetFileLine(castN.GetHasUnstagedChanges(), castN.GetHasStagedChanges(), castN.NameAtDepth(depth), diffName, submoduleConfigs, castN.File)
+	})
+}