diff --git a/job_submit_fx/functions.lua b/job_submit_fx/functions.lua
index 05f90b0..4102e92 100644
--- a/job_submit_fx/functions.lua
+++ b/job_submit_fx/functions.lua
@@ -1,132 +1,143 @@
 local f = {}
 
 -- local curl = require("cURL")
 local json = require("json")
 local http_h = require("http.headers")
 local http_r = require("http.request")
 
 -- convert list to set
 -- it facilitates checking if a value exist in the list
-function f.utils_Set(list)
+function f.list2set(list)
   local set = {}
   for _, l in ipairs(list) do set[l] = true end
   return set
 end
 
+-- convert list to a string : {'a', 'b'} => ["a", "b"]
+function f.list2str(list)
+  _list = {}
+  for _, l in ipairs(list) do
+    if type(l) == "string" then _i = '"'..l..'"' else _i = l end
+    table.insert(_list,_i)
+  end
+  str = '['..table.concat(_list,',')..']'
+  return str
+end
+
 -- printf equivalent
 function f.printf(s,...)
   return io.write(s:format(...))
 end
 
 -- sprintf equivalent
 function f.sprintf(s,...)
   return s:format(...)
 end
 
 -- format date with %Y-%m-%dT00:00:00 format
 function f.format_date(year,month,day)
   return os.date('%Y-%m-%dT%H:%M:%S',os.time({year=year,month=month,day=day,hour=0,min=0,sec=0}))
 end
 
 -- print table
 function f.dump_table(t,size)
   if not t then return print(nil) end
   if not size then size = 0 end
   for key, value in pairs(t) do
     if size ~= 0 then
       for i=1,size do io.write('=') end
       io.write(' ')
     end
     if type(value) == 'table' then
       print(key)
       dump_table(value,size+2)
     else
       print(key, value)
     end
   end
 end
 
 -- http get
 function f.http_get(url, headers, data)
   local ret = nil
   local req = http_r.new_from_uri(url)
   for name, value in pairs(headers) do
     req.headers:append(name,value)
   end
   req.headers:upsert("content-type", "application/json")
   if data ~= nil then
     req.headers:upsert(":method", "GET")
     req:set_body(data)
   end
   -- slurm.log_user("url : "..url)
   local headers_r, stream = assert(req:go())
   local body = assert(stream:get_body_as_string())
   if headers_r:get ":status" == "200" then
     ret = json.decode(body)
   end
   return ret
 end
 
 function f.log_user_and_debug(fmt, ...)
 --[[Implicit definition of arg was removed in Lua 5.2]]--
 	local arg = {...}
 	slurm.log_user(fmt, unpack(arg))
 	slurm.log_debug(fmt, unpack(arg))
 end
 
 
 
 -- -- collect function for curl
 -- function collect(chunk)
 --   if chunk ~= nil then
 --     res = res .. chunk
 --     end
 --   return true
 -- end
 
 -- -- curl get
 -- function f.curl_get(url, headers)
 --   res = ''
 --   ret = nil
 --   curl.easy{
 --       url = url,
 --       httpheader = headers,
 --       writefunction = collect
 --       --writefunction = io.stderr -- use io.stderr:write()
 --   }
 --   :perform()
 --   :close()
 --   if res ~= nil then
 --     decode = json.decode(res)
 --   end
 --   if decode ~= nil then
 --     if decode.found then
 --       ret = decode
 --     end
 --   end
 --   return ret
 -- end
 
 -- -- curl post
 -- function f.curl_post(url, headers, data)
 --   res = ""
 --   ret = nil
 --   curl.easy{
 --       url = url,
 --       post = true,
 --       httpheader = headers,
 --       postfields = data,
 --       writefunction = collect
 --   }
 --   :perform()
 --   :close()
 --   if res ~= nil then
 --     decode = json.decode(res)
 --   end
 --   if not decode.time_out and decode ~= nil or decode.status == 200 then
 --     ret = decode
 --   end
 --   return ret
 -- end
 
 return f