From 9c84c781290a670ca9734788b49f1ea0d45efe12 Mon Sep 17 00:00:00 2001
From: lethosor <lethosor@gmail.com>
Date: Mon, 10 Aug 2015 12:44:27 -0400
Subject: [PATCH] Make lua listdir functions return useful error messages

---
 library/LuaApi.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/library/LuaApi.cpp b/library/LuaApi.cpp
index 0e507dafe..c23cfe22a 100644
--- a/library/LuaApi.cpp
+++ b/library/LuaApi.cpp
@@ -2209,7 +2209,14 @@ static int filesystem_listdir(lua_State *L)
     luaL_checktype(L,1,LUA_TSTRING);
     std::string dir=lua_tostring(L,1);
     std::vector<std::string> files;
-    DFHack::Filesystem::listdir(dir, files);
+    int err = DFHack::Filesystem::listdir(dir, files);
+    if (err)
+    {
+        lua_pushnil(L);
+        lua_pushstring(L, strerror(err));
+        lua_pushinteger(L, err);
+        return 3;
+    }
     lua_newtable(L);
     for(int i=0;i<files.size();i++)
     {
@@ -2232,8 +2239,12 @@ static int filesystem_listdir_recursive(lua_State *L)
     if (err)
     {
         lua_pushnil(L);
+        if (err == -1)
+            lua_pushfstring(L, "max depth exceeded: %d", depth);
+        else
+            lua_pushstring(L, strerror(err));
         lua_pushinteger(L, err);
-        return 2;
+        return 3;
     }
     lua_newtable(L);
     int i = 1;