refacto: make git module interface to wait for job to finish

allows simplify the explore/reload/find/initialization by making the
whole code synchronous. No more callback needed.

lua/nvim-tree/explorer/init.lua

@@ -1,7 +1,6 @@
 local uv = vim.loop
 
 local git = require"nvim-tree.git"
-local renderer = require"nvim-tree.renderer"
 
 local M = {}
 
@@ -13,33 +12,24 @@ Explorer.__index = Explorer
 
 function Explorer.new(cwd)
   cwd = uv.fs_realpath(cwd or uv.cwd())
-  return setmetatable({
+  local explorer = setmetatable({
     cwd = cwd,
     nodes = {}
   }, Explorer)
+  explorer:_load(explorer)
+  return explorer
 end
 
 function Explorer:_load(node)
   local cwd = node.cwd or node.link_to or node.absolute_path
-  git.load_project_status(cwd, function(git_statuses)
-    M.explore(node, git_statuses)
-    if type(self.init_cb) == "function" then
-      self.init_cb(self)
-      self.init_cb = nil
-    end
-  end)
+  local git_statuses = git.load_project_status(cwd)
+  M.explore(node, git_statuses)
 end
 
 function Explorer:expand(node)
-  self.init_cb = renderer.draw
   self:_load(node)
 end
 
-function Explorer:init(f)
-  self.init_cb = f
-  self:_load(self)
-end
-
 function M.setup(opts)
   require"nvim-tree.explorer.utils".setup(opts)
 end