Module:Comma separated entries

local p = {}

local function _main( args )

   local sep = mw.message.new( 'comma-separator' ):plain()
   return table.concat( args, sep )

end

function p.main( frame )

   local origArgs
   if frame == mw.getCurrentFrame() then
       -- We're being called via #invoke. If the invoking template passed any arguments,
       -- use them. Otherwise, use the arguments that were passed into the template.
       origArgs = frame:getParent().args
       for k, v in pairs( frame.args ) do
           origArgs = frame.args
           break
       end
   else        
       -- We're being called from another module or from the debug console, so assume
       -- the arguments are passed in directly.
       origArgs = frame
   end
   
   -- Use integer args only, and allow for explicit positional arguments
   -- that are specified out of order, e.g. entry3.
   -- After processing, the args can be accessed accurately from ipairs.
   local args = {}
   for k, v in pairs( origArgs ) do
       if type( k ) == 'number' 
           and k >= 1 
           and math.floor( k ) == k
           and mw.ustring.match( v, '%S' ) -- Remove blank or whitespace values.
           then
           table.insert( args, k )
       end
   end
   table.sort( args )
   for i,v in ipairs( args ) do
       args[ i ] = origArgs[ v ]
       -- Trim whitespace from all args.
       if type( args[ i ] ) == 'string' then
           args[ i ] = mw.text.trim( args[ i ] )
       end
   end

   return _main( args )

end

return p