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This is good example of how we can Eliminate bottlenecks with IguanaX usePrefix Namespaces for Separating Concerns by building a custom file reader component which has a simple interface for a unique purpose rather than using a general purpose no code solution - see The problem with no-code solutions.

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title	Use +FROM URL to import a custom version of the file reader component for this tutorial

This component generates some test files to make it easier to learn how to make a custom file reader.

You can useCreate component +FROM URL to import the component.

Copy paste the URL from here:

Code Block
git@bitbucket.org:interfaceware/file_tutorial.git

Refer to Customizing components

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title	Click Edit on the Customize then the Copy and Edit button so you can access the Translator and alter the code

component card, then MAKE A COPY AND EDIT to open the Translator editor

Refer to Edit a Component to see how it's done if you have not done this before.

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title	Click on MatchRules.lua in the Project Tree to see where we need to alter the code

Navigate to MatchRules.lua in the Project Tree. This is the function we need to alter:

Code Block

language	lua

function MatchFile(FileName)
   return true
end

The file reader component is deliberately simple and uses /wiki/spaces/IXB/pages/3181903910 separation of concerns to make it more obvious how to modify the code to meet new needs. We need this function to return true when the matching criteria are met.

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title	Let's extract the filename using FILfilename() from the FIL Library, so we can look at it:

Change the matching to add in two lines so we can see the filenames we need to filter on.

Code Block

language	lua

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

These are the concepts we have used:

A function
FIL Library used to get the file name
Using trace() function

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title	Edit MatchRules.lua to extract the prefixes from the custom fields

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:

Code Block

language	lua

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 to maintain a common naming convention
Custom Fields

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title	Break the comma delimited string into a list to get each prefix Id

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

Code Block

language	lua

IdList = IdList:split(",")

You should see something like:

Concepts used:

String:split()

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title	Make a matching function which takes the prefix and sees if the filename starts with it

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

Code Block

language	lua

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 AppmatchPrefix.

Concepts used:

A function
https://interfaceware.atlassian.net/wiki/spaces/IXB/pages/2684813341/Operator+on+# Operator on Strings to get the length of the prefix
String:sub()
Equality and inequality operators

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There is no limit to how you can streamline the usage of a custom component - if that helps address a bottleneck, then it is well worth it.

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