* luci/libs: add keys() to luci.util

diff --git a/libs/core/luasrc/util.lua b/libs/core/luasrc/util.lua
index ef1b8fe..c6d9ec6 100644 (file)
--- a/libs/core/luasrc/util.lua
+++ b/libs/core/luasrc/util.lua
@@ -358,6 +358,19 @@ function update(t, updates)
        end
 end
 
+--- Retrieve all keys of given associative table.
+-- @param t    Table to extract keys from
+-- @return     Sorted table containing the keys
+function keys(t)
+       local keys = { }
+       if t then
+               for k, _ in kspairs(t) do
+                       table.insert( keys, k )
+               end
+       end
+       return keys
+end
+
 --- Clones the given object and return it's copy.
 -- @param object       Table value to clone
 -- @param deep         Boolean indicating whether to do recursive cloning