better shell printing support

lib/shell.lua

@@ -10,6 +10,14 @@ local function shindex(self,k)
  return _G[k]
 end
 
+local function formatValue(v)
+ if type(v) == "table" then
+  local w, rs = pcall(serial.serialize,v)
+  if w then return rs end
+ end
+ return tostring(v)
+end
+
 function shell.interactive()
  local shenv = setmetatable({}, {__index=shindex})
  local run = true
@@ -26,16 +34,7 @@ function shell.interactive()
    local rt = {pcall(f)}
    local rs = table.remove(rt,1)
    for k,v in pairs(rt) do
-    if type(v) == "table" then
-     local w, s = pcall(serial.serialize,v)
-     if w then
-      print(s)
-     else
-      print(tostring(v))
-     end
-    else
-     print(tostring(v))
-    end
+    print(formatValue(v))
    end
   end
  end