core/autocommands.vim

@@ -41,6 +41,26 @@ function s:resume_cursor_position() abort
   endif
 endfunction
 
+" Display a message when the current file is not in utf-8 format.
+" Note that we need to use `unsilent` command here because of this issue:
+" https://github.com/vim/vim/issues/4379
+augroup non_utf8_file_warn
+  autocmd!
+  " we can not use `lua vim.notify()`: it will error out E5107 parsing lua.
+  autocmd BufRead * if &fileencoding != 'utf-8' | call v:lua.vim.notify('File not in UTF-8 format!', 'warn', {'title': 'nvim-config'}) | endif
+augroup END
+
+" Automatically reload the file if it is changed outside of Nvim, see
+" https://unix.stackexchange.com/a/383044/221410. It seems that `checktime`
+" command does not work in command line. We need to check if we are in command
+" line before executing this command. See also
+" https://vi.stackexchange.com/a/20397/15292.
+augroup auto_read
+  autocmd!
+  autocmd FileChangedShellPost * call v:lua.vim.notify("File changed on disk. Buffer reloaded!", 'warn', {'title': 'nvim-config'})
+  autocmd FocusGained,CursorHold * if getcmdwintype() == '' | checktime | endif
+augroup END
+
 augroup numbertoggle
   autocmd!
   autocmd BufEnter,FocusGained,InsertLeave,WinEnter * if &nu | set rnu   | endif
@@ -68,6 +88,12 @@ function! s:custom_highlight() abort
   highlight MatchParen cterm=bold,underline gui=bold,underline
 endfunction
 
+" highlight yanked region, see `:h lua-highlight`
+augroup highlight_yank
+  autocmd!
+  au TextYankPost * silent! lua vim.highlight.on_yank{higroup="YankColor", timeout=300, on_visual=false}
+augroup END
+
 augroup auto_close_win
   autocmd!
   autocmd BufEnter * call s:quit_current_win()
@@ -99,6 +125,17 @@ augroup git_repo_check
   autocmd VimEnter,DirChanged * call utils#Inside_git_repo()
 augroup END
 
+" Auto-generate packer_compiled.lua file
+augroup packer_auto_compile
+  autocmd!
+  autocmd BufWritePost */nvim/lua/plugins.lua source <afile> | PackerCompile
+augroup END
+
+augroup auto_create_dir
+  autocmd!
+  autocmd BufWritePre * lua require('utils').may_create_dir()
+augroup END
+
 " ref: https://vi.stackexchange.com/a/169/15292
 function! s:handle_large_file() abort
   let g:large_file = 10485760 " 10MB
@@ -118,6 +155,3 @@ augroup LargeFile
   autocmd!
   autocmd BufReadPre * call s:handle_large_file()
 augroup END
-
-" Load auto-command defined in Lua
-lua require("custom-autocmd")

lua/custom-autocmd.lua

@@ -1,92 +0,0 @@
-local fn = vim.fn
-local api = vim.api
-
-local utils = require("utils")
-
-
--- Display a message when the current file is not in utf-8 format.
--- Note that we need to use `unsilent` command here because of this issue:
--- https://github.com/vim/vim/issues/4379
-api.nvim_create_augroup("non_utf8_file", {
-  clear = true
-})
-
-api.nvim_create_autocmd({ "BufRead" }, {
-  pattern = "*",
-  group = "non_utf8_file",
-  callback = function()
-    if vim.bo.fileencoding ~= 'utf-8' then
-      vim.notify("File not in UTF-8 format!", vim.log.levels.WARN, { title = "nvim-config" })
-    end
-  end
-})
-
--- highlight yanked region, see `:h lua-highlight`
-api.nvim_create_augroup("highlight_yank", {
-  clear = true
-})
-
-api.nvim_create_autocmd({ "TextYankPost" }, {
-  pattern = "*",
-  group = "highlight_yank",
-  callback = function()
-    vim.highlight.on_yank { higroup = "YankColor", timeout = 300, on_visual = false }
-  end
-})
-
--- Auto-generate packer_compiled.lua file
-api.nvim_create_augroup("packer_auto_compile", {
-  clear = true
-})
-
-api.nvim_create_autocmd({ "BufWritePost" }, {
-  pattern = "*/nvim/lua/plugins.lua",
-  group = "packer_auto_compile",
-  callback = function()
-    local fpath = fn.expand("<afile>")
-    local cmd = "source " .. fpath
-    vim.cmd(cmd)
-    vim.cmd("PackerCompile")
-  end
-})
-
--- Auto-create dir when saving a file, in case some intermediate directory does not exist
-api.nvim_create_augroup("auto_create_dir", {
-  clear = true
-})
-
-api.nvim_create_autocmd({ "BufWritePre" }, {
-  pattern = "*",
-  group = "auto_create_dir",
-  callback = function()
-    local fpath = fn.expand('<afile>')
-    local dir = fn.fnamemodify(fpath, ":p:h")
-
-    utils.may_create_dir(dir)
-  end
-})
-
--- Automatically reload the file if it is changed outside of Nvim, see https://unix.stackexchange.com/a/383044/221410.
--- It seems that `checktime` does not work in command line. We need to check if we are in command
--- line before executing this command, see also https://vi.stackexchange.com/a/20397/15292 .
-api.nvim_create_augroup("auto_read", {
-  clear = true
-})
-
-api.nvim_create_autocmd({ "FileChangedShellPost" }, {
-  pattern = "*",
-  group = "auto_read",
-  callback = function()
-    vim.notify("File changed on disk. Buffer reloaded!", vim.log.levels.WARN, { title = "nvim-config" })
-  end
-})
-
-api.nvim_create_autocmd({ "FocusGained", "CursorHold" }, {
-  pattern = "*",
-  group = "auto_read",
-  callback = function()
-    if fn.getcmdwintype() == '' then
-      vim.cmd("checktime")
-    end
-  end
-})

lua/utils.lua

@@ -15,12 +15,13 @@ function M.executable(name)
   return false
 end
 
---- Create a dir if if does not exist
+function M.may_create_dir()
-function M.may_create_dir(dir)
+  local fpath = fn.expand('<afile>')
-  local res = fn.isdirectory(dir)
+  local parent_dir = fn.fnamemodify(fpath, ":p:h")
+  local res = fn.isdirectory(parent_dir)
 
   if res == 0 then
-    fn.mkdir(dir, 'p')
+    fn.mkdir(parent_dir, 'p')
   end
 end