Custom tag for ColdFusion implementing cache busting

js_script.cfm

<!---
Goal: implement timestamp-based cache busting
For example: instead of loading a javascript file from "http://www.example.com/myscript.js", it'll load it from "http://www.example.com/myscript.js?20191101160030"

Usage examples:
 - add as global tag and: <CF_js_script src="/js/myscript.js">
 - <cfimport prefix="akaita" taglib="customTags"> and then <akaita:js_script src="/js/myscript.js"></akaita:js_script>
--->

<CFSETTING ENABLECFOUTPUTONLY="Yes">
<CFIF thisTag.executionMode IS "start">
    <CFSET scriptFile = expandPath(attributes.src)>
    <CFIF fileExists(scriptFile)>
        <CFSET fileInfo = getFileInfo(scriptFile)>
        <CFSET timeStamp = dateFormat(fileInfo.lastModified, "yyyymmdd")
        & timeFormat(fileInfo.lastModified, "HHmmss")>
    <CFELSE>
        <CFOUTPUT>File #attributes.src# not found</CFOUTPUT>
        <CFABORT>
    </CFIF>
    <CFOUTPUT>
      <SCRIPT type="text/javascript" src="#attributes.src#?ver=#timestamp#"></SCRIPT>
    </CFOUTPUT>
</CFIF>
<CFSETTING ENABLECFOUTPUTONLY="no">