" Vim filetype plugin file.
" Language:		Lua
" Maintainer:		Doug Kearns <dougkearns@gmail.com>
" Previous Maintainer:	Max Ischenko <mfi@ukr.net>
" Contributor:		Dorai Sitaram <ds26@gte.com>
"			C.D. MacEachern <craig.daniel.maceachern@gmail.com>
"			Phạm Bình An <phambinhanctb2004@gmail.com>
" Last Change:		2025 Feb 27

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

" keep in sync with syntax/lua.vim
if !exists("lua_version")
  " Default is lua 5.3
  let lua_version = 5
  let lua_subversion = 3
elseif !exists("lua_subversion")
  " lua_version exists, but lua_subversion doesn't. In this case set it to 0
  let lua_subversion = 0
endif

let s:cpo_save = &cpo
set cpo&vim

setlocal comments=:---,:--
setlocal commentstring=--\ %s
setlocal formatoptions-=t formatoptions+=croql

let &l:define = '\<function\|\<local\%(\s\+function\)\='

let &l:include = '\<\%(\%(do\|load\)file\|require\)\s*('
setlocal includeexpr=s:LuaInclude(v:fname)
setlocal suffixesadd=.lua

let b:undo_ftplugin = "setl cms< com< def< fo< inc< inex< sua<"

if exists("loaded_matchit") && !exists("b:match_words")
  let b:match_ignorecase = 0
  let b:match_words =
	\ '\<\%(do\|function\|if\)\>:' ..
	\ '\<\%(return\|else\|elseif\)\>:' ..
	\ '\<end\>,' ..
	\ '\<repeat\>:\<until\>,' ..
	\ '\%(--\)\=\[\(=*\)\[:]\1]'
  let b:undo_ftplugin ..= " | unlet! b:match_words b:match_ignorecase"
endif

if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
  let b:browsefilter = "Lua Source Files (*.lua)\t*.lua\n"
  if has("win32")
    let b:browsefilter ..= "All Files (*.*)\t*\n"
  else
    let b:browsefilter ..= "All Files (*)\t*\n"
  endif
  let b:undo_ftplugin ..= " | unlet! b:browsefilter"
endif

" The rest of the file needs to be :sourced only once per Vim session
if exists("s:loaded_lua") || &cp
  let &cpo = s:cpo_save
  unlet s:cpo_save
  finish
endif
let s:loaded_lua = 1

function s:LuaInclude(fname) abort
  let lua_ver = str2float(printf("%d.%02d", g:lua_version, g:lua_subversion))
  let fname = tr(a:fname, '.', '/')
  let paths = lua_ver >= 5.03 ? [fname .. ".lua", fname .. "/init.lua"] : [fname .. ".lua"]
  for path in paths
    if filereadable(path)
      return path
    endif
  endfor
  return fname
endfunction

" vim: nowrap sw=2 sts=2 ts=8 noet: