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Create a second function, APPidList(), to extract the ClientList prefixes from the custom fields and update MatchFile () to call APPidList().

You can replace the contents of the MatchRules.lua file with this new code:

function APPidList()
   local IdList = component.fields()["ClientList"]
   return IdList
end

function MatchFile(FileName)
   local IdList = APPidList()
   trace(IdList)
   local JustFileName = FILfilename(FileName)
   trace(JustFileName)
   return true
end

Concepts used:

• /wiki/spaces/IXB/pages/3181903910

• Writing a function

• Using trace() function

• Using APP as a prefix, see Using prefixes for naming code

• Custom Fields

We can quickly do this by adding one line to AppidList( ) after line 2:

IdList = IdList:split(",")

You should see something like:

Concepts used:

• String:split()

Create a third function, APPmatchPrefix(), to determine if the filename matches the prefix. You can copy the code below:

function APPmatchPrefix(Prefix, FileName)
   local Part = FileName:sub(1, #Prefix)
   trace(Part, Prefix)
   return (Part == Prefix)
end

See the screenshot below and add a line to MatchFile() to call and invoke the AppmatchPrefix() function.

Concepts used:

• A function

• https://interfaceware.atlassian.net/wiki/spaces/IXB/pages/2684813341/Operator+on+Strings to get the length of the prefix

• String:sub()

• Equality and inequality operators

Let’s modify the code to go through the entire list of prefixes:

for i = 1, #IdList do
   if APPmatchPrefix(IdList[i], JustFileName) then 
      return true
   end
end
return false -- we didn't match anything

And this is what you should see:

Concepts used:

• For loop with Lua table as list

• using # Operator on Lua Tables

• if statements

This means refining the APPidList function.

That would involve looping through the list and removing white space from each ID:

Concepts:

• Lua table as list and

• Trimming white space

• table:remove()

Add intuitive Custom Logging for your component to increase visibility into processing and adding meaningful messages to help with troubleshooting.

You can see an example of this in main.lua on line 25:

iguana.log("Polling every "..Polltime.." seconds");

Try it for yourself!