Refacto: rewrite everything

- The tree is created with libuv functions, which makes it blazingly fast.
- The tree may now be faster than any other vim trees, it can handle directories with thousands of files without any latency at all (tested on 40K files, works flawlessly).
- More solid logic for opening and closing the tree.
- tree state is remembered (closing / opening a folder keeps opened subdirectories open)
- detection of multiple git projects in the tree
- more icon support
- smart rendering
- smart updates
- ms windows support
- gx replacement function running xdg-open on linux, open on macos

lua/lib/git.lua

@@ -1,79 +0,0 @@
-local api = vim.api
-local config = require 'lib/config'
-local utils = require'lib.utils'
-
-local M = {}
-
-local function system(v) return api.nvim_call_function('system', { v }) end
-local function systemlist(v) return api.nvim_call_function('systemlist', { v }) end
-
-local function is_git_repo()
-  local is_git = system('git rev-parse')
-  return is_git:match('fatal') == nil
-end
-
-local IS_GIT_REPO = is_git_repo()
-
-local function set_git_status()
-  if IS_GIT_REPO == false then return '' end
-  return systemlist('git status --porcelain=v1')
-end
-
-local GIT_STATUS = set_git_status()
-
-function M.refresh_git()
-  if IS_GIT_REPO == false then return false end
-  GIT_STATUS = set_git_status()
-  return true
-end
-
-function M.force_refresh_git()
-  IS_GIT_REPO = is_git_repo()
-  M.refresh_git()
-end
-
-local function is_folder_dirty(relpath)
-  for _, status in pairs(GIT_STATUS) do
-    if status:match(utils.path_to_matching_str(relpath)) ~= nil then
-      return true
-    end
-  end
-end
-
-local function create_git_checker(pattern)
-  return function(relpath)
-    for _, status in pairs(GIT_STATUS) do
-      local ret = status:match('^.. .*' .. utils.path_to_matching_str(relpath))
-      if ret ~= nil and ret:match(pattern) ~= nil then return true end
-    end
-    return false
-  end
-end
-
-local unstaged = create_git_checker('^ ')
-local staged = create_git_checker('^M ')
-local staged_new = create_git_checker('^A ')
-local staged_mod = create_git_checker('^MM')
-local unmerged = create_git_checker('^[U ][U ]')
-local renamed = create_git_checker('^R')
-local untracked = create_git_checker('^%?%?')
-
-function M.get_git_attr(path, is_dir)
-  if IS_GIT_REPO == false or not config.SHOW_GIT_ICON then return '' end
-  if is_dir then
-    if is_folder_dirty(path) == true then return '✗ ' end
-  else
-    if unstaged(path) then return '✗ '
-    elseif staged(path) then return '✓ '
-    elseif staged_new(path) then return '✓★ '
-    elseif staged_mod(path) then return '✓✗ '
-    elseif unmerged(path) then return '═ '
-    elseif renamed(path) then return '➜ '
-    elseif untracked(path) then return '★ '
-    end
-  end
-
-  return ''
-end
-
-return M