From ee2af42d5f13d72d877c1c4bcb97918f7428f694 Mon Sep 17 00:00:00 2001
From: JINNOUCHI Yasushi <me@delphinus.dev>
Date: Sun, 18 Aug 2024 22:33:26 +0900
Subject: [PATCH] fix: avoid errors occurred by async.util.join (#244)

---
 lua/frecency/database.lua | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lua/frecency/database.lua b/lua/frecency/database.lua
index 569e25d..f5c6ae7 100644
--- a/lua/frecency/database.lua
+++ b/lua/frecency/database.lua
@@ -116,14 +116,17 @@ end
 ---@async
 ---@return string[]
 function Database:unlinked_entries()
-  return vim.tbl_flatten(async.util.join(vim.tbl_map(function(path)
+  -- HACK: async.util.join() does not work with empty table. So when the table
+  -- has no entries, return early.
+  local async_fns = vim.tbl_map(function(path)
     return function()
       local err, realpath = async.uv.fs_realpath(path)
       if err or not realpath or realpath ~= path or fs.is_ignored(realpath) then
         return path
       end
     end
-  end, vim.tbl_keys(self.tbl.records))))
+  end, vim.tbl_keys(self.tbl.records))
+  return #async_fns > 0 and vim.tbl_flatten(async.util.join(async_fns)) or {}
 end
 
 ---@async