Index: openacs-4/packages/acs-templating/tcl/head-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/head-procs.tcl,v
diff -u -r1.45.2.5 -r1.45.2.6
--- openacs-4/packages/acs-templating/tcl/head-procs.tcl	16 Apr 2019 09:28:04 -0000	1.45.2.5
+++ openacs-4/packages/acs-templating/tcl/head-procs.tcl	16 Apr 2019 11:28:35 -0000	1.45.2.6
@@ -119,6 +119,7 @@
     {-script ""}
     {-src ""}
     {-type "text/javascript"}
+    {-version ""}
 } {
     Add a script to the head section of the document to be returned to the
     users client.  A script library in an external file may only be included
@@ -142,6 +143,10 @@
     @param src     the src attribute of the script tag, i.e. the source url of the
                    script
     @param type    the type attribute of the script tag, e.g. 'text/javascript'
+    @param version the version of the resource, which will be appended as a query
+                   string to the end of the href (.../filename?ver=...).
+                   Useful to perform 'cache busting' in browser cached resources,
+                   to force retrieval
 
 } {
     if {$defer_p} {
@@ -184,6 +189,9 @@
 
         lappend ::template::head::scripts(anonymous) $type "" $charset $defer $async $script $order $crossorigin $integrity
     } else {
+        if {$version ne ""} {
+            set src "$src?ver=$version"
+        }
         set ::template::head::scripts($src) [list $type $src $charset $defer $async "" $order $crossorigin $integrity]
     }
 }
@@ -430,6 +438,7 @@
     {-order "0"}
     {-script ""}
     {-src ""}
+    {-version ""}
 } {
     Add a script of type 'text/javascript' to the head section of the document
     to be returned to the users client.  This function is a wrapper around
@@ -450,6 +459,10 @@
                    src
     @param src     the src attribute of the script tag, i.e. the source url of the
                    script
+    @param version the version of the resource, which will be appended as a query
+                   string to the end of the href (.../filename?ver=...).
+                   Useful to perform 'cache busting' in browser cached resources,
+                   to force retrieval
 
     @see template::head::add_script
 } {
@@ -460,7 +473,9 @@
         -charset $charset \
         -script $script \
         -order $order \
-        -crossorigin $crossorigin -integrity $integrity
+        -crossorigin $crossorigin \
+        -integrity $integrity \
+        -version $version
 }
 
 ad_proc -public template::head::add_css {