[tarantool-patches] [PATCH 1/6] box/console: Add mapping for direct symbols

[Cyrill Gorcunov <gorcunov@gmail.com>]

Sole symbols (such as box.NULL) are not processed
by serpent "custom" symbols feature, since they
are not in table.

Thus we should process them separately. Without it
we have

 > require('console').set_default_output("lua,block")
 > ;
 > box.NULL
 > "cdata<void %*>: NULL";

instead of

 > box.NULL
 > box.NULL;

as it should be.

Part-of #3834
---
 src/box/lua/console.lua | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/box/lua/console.lua b/src/box/lua/console.lua
index 64086cf5b..22bafab3a 100644
--- a/src/box/lua/console.lua
+++ b/src/box/lua/console.lua
@@ -46,6 +46,17 @@ output_handlers["lua"] = function(status, opts, ...)
     if not ... then
         return ""
     end
+    -- Map internal symbols in case if they are
+    -- not inside tables and serpent won't handle
+    -- them properly.
+    local map_direct_symbols = {
+        [box.NULL]      = 'box.NULL',
+    }
+    for k,v in pairs(map_direct_symbols) do
+        if k == ... then
+            return v
+        end
+    end
     --
     -- Map internal symbols which serpent doesn't know
     -- about to a known representation.
-- 
2.20.1