add LuaTreeFindFile, doc and option

lua/lib/state.lua

@@ -119,6 +119,38 @@ local function refresh_tree()
     end
 end
 
+local function clone(obj)
+  if type(obj) ~= 'table' then return obj end
+  local res = {}
+  for k, v in pairs(obj) do res[clone(k)] = clone(v) end
+  return res
+end
+
+local function find_file(path)
+    local relpath = string.sub(path, #ROOT_PATH + 1, -1)
+
+    local tree_copy = clone(Tree)
+
+    for i, node in pairs(tree_copy) do
+        if node.relpath and string.match(relpath, node.relpath) then
+            if node.relpath == relpath then
+                Tree = clone(tree_copy)
+                return i
+            end
+            if node.dir and not node.open then
+                local path = node.path .. node.name
+                node.open = true
+                local dirs = list_dirs(path)
+                for j, n in pairs(create_nodes(path, node.relpath, node.depth + 1, dirs)) do
+                    table.insert(tree_copy, i + j, n)
+                end
+            end
+        end
+    end
+
+    return nil
+end
+
 local function open_dir(tree_index)
     local node = Tree[tree_index];
     node.open = not node.open
@@ -152,4 +184,5 @@ return {
     open_dir = open_dir;
     set_root_path = set_root_path;
     get_cwd = get_cwd;
+    find_file = find_file;
 }

lua/tree.lua

@@ -16,6 +16,7 @@ local init_tree = state.init_tree
 local open_dir = state.open_dir
 local refresh_tree = state.refresh_tree
 local set_root_path = state.set_root_path
+local find_file = state.find_file
 
 local winutils = require 'lib/winutils'
 local update_view = winutils.update_view
@@ -24,6 +25,7 @@ local close = winutils.close
 local open = winutils.open
 local set_mappings = winutils.set_mappings
 local replace_tree = winutils.replace_tree
+local get_win = winutils.get_win
 
 local git = require 'lib/git'
 local refresh_git = git.refresh_git
@@ -147,6 +149,19 @@ local function check_buffer_and_open()
     end
 end
 
+local function find()
+    local line = find_file(api.nvim_buf_get_name(0))
+    if not line then return end
+
+    update_view()
+
+    local win = get_win()
+    if win then 
+        api.nvim_win_set_cursor(win, { line, 0 })
+    end
+
+end
+
 return {
     toggle = toggle;
     open_file = open_file;
@@ -155,5 +170,6 @@ return {
     check_windows_and_close = check_windows_and_close;
     check_buffer_and_open = check_buffer_and_open;
     replace_tree = replace_tree;
+    find = find;
 }