Merge pull request #70 from jdhao/lua-autuocmd

refactor: move part of autocmd to lua script

core/autocommands.vim

@@ -41,26 +41,6 @@ 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
@@ -88,12 +68,6 @@ 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()
@@ -125,17 +99,6 @@ 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(vim.fn.fnamemodify(vim.fn.expand('<afile>'), ":p:h"))
-augroup END
-
 " ref: https://vi.stackexchange.com/a/169/15292
 function! s:handle_large_file() abort
   let g:large_file = 10485760 " 10MB
@@ -155,3 +118,6 @@ 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

@@ -0,0 +1,92 @@
+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
+})