add Gitignore (#251)

lua/nvim-tree/git.lua

@@ -30,6 +30,10 @@ local function update_root_status(root)
   end
 end
 
+function M.get_path_gitexclude()
+  return vim.fn.system("git config --get core.excludesFile")
+end
+
 function M.reload_roots()
   for root, status in pairs(roots) do
     if status ~= not_git then

lua/nvim-tree/populate.lua

@@ -100,6 +100,21 @@ end
 
 local function gen_ignore_check()
   local ignore_list = {}
+
+  local function add_toignore(path)
+    local content = utils.read_file(path)
+    for s in content:gmatch("[^\r\n]+") do
+      ignore_list[s] = true
+    end
+  end
+
+  if (vim.g.nvim_tree_gitignore or 0) > 0 then
+    add_toignore('.gitignore')
+  end
+  if (vim.g.nvim_tree_gitignore or 0) == 2 then
+    add_toignore(git.get_path_gitexclude())
+  end
+  
   if vim.g.nvim_tree_ignore and #vim.g.nvim_tree_ignore > 0 then
     for _, entry in pairs(vim.g.nvim_tree_ignore) do
       ignore_list[entry] = true

lua/nvim-tree/utils.lua

@@ -1,4 +1,5 @@
 local M = {}
+local uv = vim.loop -- or require("luv") ? i dont understand
 local api = vim.api
 
 function M.path_to_matching_str(path)
@@ -11,6 +12,16 @@ function M.echo_warning(msg)
   api.nvim_command('echohl None')
 end
 
+function M.read_file(path)
+  local fd = uv.fs_open(path, "r", 438)
+  if not fd then return '' end
+  local stat = uv.fs_fstat(fd)
+  if not stat then return '' end
+  local data = uv.fs_read(fd, stat.size, 0)
+  uv.fs_close(fd)
+  return data or ''
+end
+
 local path_separator = package.config:sub(1,1)
 function M.path_join(paths)
   return table.concat(paths, path_separator)