refactor(lang#lua)!: remove vim-support and add layer options

1. add `lua_file_head`
2. add `format_on_save`
3. disable lua-support

BREAKING CHANGE: remove lua-support plugin

autoload/SpaceVim/layers/lang/lua.vim

@@ -15,6 +15,30 @@
 "     name = 'lang#lua'
 " <
 "
+" @subsection Layer options
+"
+" 1. lua_file_head: the default file head for lua source code.
+" >
+"   [layers]
+"     name = "lang#lua"
+"     ruby_file_head = [      
+"       '--!/usr/bin/lua',
+"       ''
+"     ]
+" <
+" 2. repl_command: the REPL command for lua
+" >
+"   [[layers]]
+"     name = 'lang#lua'
+"     repl_command = '~/download/bin/lua'
+" <
+" 3. format_on_save: enable/disable code formation when save lua file. This
+" options is disabled by default, to enable it:
+" >
+"   [[layers]]
+"     name = 'lang#lua'
+"     format_on_save = true
+" <
 " @subsection Key bindings
 " >
 "   Mode            Key             Function
@@ -34,17 +58,25 @@
 " <
 "
 
+
+if exists('s:lua_repl_command')
+  finish
+endif
+
+let s:lua_repl_command = ''
+let s:lua_foldmethod = 'manual'
+let s:lua_file_head = [
+      \ '--!/usr/bin/lua',
+      \ ''
+      \ ]
+
 function! SpaceVim#layers#lang#lua#plugins() abort
   let plugins = []
   " Improved Lua 5.3 syntax and indentation support for Vim
   call add(plugins, [g:_spacevim_root_dir . 'bundle/vim-lua', {'on_ft' : 'lua'}])
-  call add(plugins, ['WolfgangMehner/lua-support', {'on_ft' : 'lua'}])
   return plugins
 endfunction
 
-let s:lua_repl_command = ''
-let s:lua_foldmethod = 'manual'
-
 function! SpaceVim#layers#lang#lua#config() abort
 
   augroup spacevim_lang_lua
@@ -78,11 +110,20 @@ function! SpaceVim#layers#lang#lua#config() abort
     let lua_repl = ['lua', '-i']
   endif
   call SpaceVim#plugins#repl#reg('lua', lua_repl)
+  call SpaceVim#layers#edit#add_ft_head_tamplate('lua', s:lua_file_head)
+  " Format on save
+  if s:format_on_save
+    call SpaceVim#layers#format#add_filetype({
+          \ 'filetype' : 'lua',
+          \ 'enable' : 1,
+          \ })
+  endif
 endfunction
 
 function! SpaceVim#layers#lang#lua#set_variable(opt) abort
   let s:lua_repl_command = get(a:opt, 'repl_command', '') 
   let s:lua_foldmethod = get(a:opt, 'foldmethod', 'manual')
+  let s:format_on_save = get(a:var, 'format_on_save', s:format_on_save)
 endfunction
 
 " Add language specific mappings

doc/SpaceVim.txt

@@ -3151,6 +3151,32 @@ development.
     name = 'lang#lua'
 <
 
+LAYER OPTIONS
+
+  1. lua_file_head: the default file head for lua source code.
+
+>
+  [layers]
+    name = "lang#lua"
+    ruby_file_head = [
+      '--!/usr/bin/lua',
+      ''
+    ]
+<
+  2. repl_command: the REPL command for lua
+
+>
+  [[layers]]
+    name = 'lang#lua'
+    repl_command = '~/download/bin/lua'
+<
+  3. format_on_save: enable/disable code formation when save lua file. This
+options is disabled by default, to enable it:
+>
+  [[layers]]
+    name = 'lang#lua'
+    format_on_save = true
+<
 KEY BINDINGS
 
 >