fix(api): vim.filetype.get_option()

- Fix a bug in the cache
- Set some buffer options on the dummy buffer

runtime/lua/vim/filetype/options.lua

@@ -3,14 +3,23 @@ local api = vim.api
 local M = {}
 
 local function get_ftplugin_runtime(filetype)
- return api.nvim__get_runtime({
+ local files = api.nvim__get_runtime({
  string.format('ftplugin/%s.vim', filetype),
  string.format('ftplugin/%s_*.vim', filetype),
  string.format('ftplugin/%s/*.vim', filetype),
  string.format('ftplugin/%s.lua', filetype),
  string.format('ftplugin/%s_*.lua', filetype),
  string.format('ftplugin/%s/*.lua', filetype),
  }, true, {}) --[[@as string[] ]]
+
+ local r = {} ---@type string[]
+ for _, f in ipairs(files) do
+ -- VIMRUNTIME should be static so shouldn't need to worry about it changing
+ if not vim.startswith(f, vim.env.VIMRUNTIME) then
+ r[#r + 1] = f
+ end
+ end
+ return r
 end
 
 -- Keep track of ftplugin files
@@ -52,14 +61,11 @@ local function update_ft_option_cache(filetype)
  end
 
  for _, f in ipairs(files) do
- -- VIMRUNTIME should be static so shouldn't need to worry about it changing
- if not vim.startswith(f, vim.env.VIMRUNTIME) then
- local mtime = hash(f)
- if ftplugin_cache[filetype][f] ~= mtime then
- -- invalidate
- ft_option_cache[filetype] = nil
- ftplugin_cache[filetype][f] = mtime
- end
+ local mtime = hash(f)
+ if ftplugin_cache[filetype][f] ~= mtime then
+ -- invalidate
+ ft_option_cache[filetype] = nil
+ ftplugin_cache[filetype][f] = mtime
  end
  end
 end

src/nvim/api/options.c

@@ -111,6 +111,10 @@ static buf_T *do_ft_buf(char *filetype, aco_save_T *aco, Error *err)
 
  // Set curwin/curbuf to buf and save a few things.
  aucmd_prepbuf(aco, ftbuf);
+ set_option_value("bufhidden", 0L, "hide", OPT_LOCAL);
+ set_option_value("buftype", 0L, "nofile", OPT_LOCAL);
+ set_option_value("swapfile", 0L, NULL, OPT_LOCAL);
+ set_option_value("modeline", 0L, NULL, OPT_LOCAL); // 'nomodeline'
 
  ftbuf->b_p_ft = xstrdup(filetype);