create util

lua/zenbones/util.lua

@@ -0,0 +1,10 @@
+local M = {}
+
+-- got from http://lua-users.org/wiki/StringInterpolation
+function M.interp(s, tab)
+	return (s:gsub("($%b{})", function(w)
+		return tab[w:sub(3, -2)] or w
+	end))
+end
+
+return M