fix: error message too many open files (#432)

and buffer previewer still "erroring" out for builtin.buffers

lua/telescope/path.lua

@@ -68,7 +68,10 @@ end
 
 path.read_file_async = function(filepath, callback)
   vim.loop.fs_open(filepath, "r", 438, function(err_open, fd)
-    assert(not err_open, err_open)
+    if err_open then
+      print("We tried to open this file but couldn't. We failed with following error message: " .. err_open)
+      return
+    end
     vim.loop.fs_fstat(fd, function(err_fstat, stat)
       assert(not err_fstat, err_fstat)
       if stat.type ~= 'file' then return callback('') end

lua/telescope/previewers/buffer_previewer.lua

@@ -202,7 +202,7 @@ previewers.vimgrep = defaulter(function(_)
       end
 
       -- Workaround for unnamed buffer when using builtin.buffer
-      if p == '[No Name]' and entry.bufnr then
+      if entry.bufnr and (p == '[No Name]' or vim.api.nvim_buf_get_option(entry.bufnr, 'buftype') ~= '') then
         local lines = vim.api.nvim_buf_get_lines(entry.bufnr, 0, -1, false)
         vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, lines)
         jump_to_line(self, self.state.bufnr, entry.lnum)

lua/telescope/previewers/term_previewer.lua

@@ -259,7 +259,11 @@ previewers.vimgrep = defaulter(function(opts)
       local height = vim.api.nvim_win_get_height(win_id)
 
       local p = from_entry.path(entry, true)
-      if p == nil or p == '' or p == '[No Name]' then return end
+      if p == nil or p == '' then return end
+      if entry.bufnr and (p == '[No Name]' or vim.api.nvim_buf_get_option(entry.bufnr, 'buftype') ~= '') then
+        return
+      end
+
       local lnum = entry.lnum or 0
 
       local context = math.floor(height / 2)