--- a/macros.xml	Thu Jul 11 09:41:13 2019 -0400
+++ b/macros.xml	Fri Sep 13 05:45:21 2019 -0400
@@ -10,7 +10,53 @@
         <version_command><![CDATA[snippy --version]]></version_command>
     </xml>
 
-    <token name="@VERSION@">4.3.6</token>
+    <token name="@REFERENCE_SOURCE_FILE@">
+        <![CDATA[
+        #if $reference_source.reference_source_selector == 'history'
+            #if $reference_source.ref_file.is_of_type("fasta")
+                ln -sf '$reference_source.ref_file' 'ref.fna' &&
+            #elif $reference_source.ref_file.is_of_type("genbank")
+                ln -sf '$reference_source.ref_file' 'ref.gbk' &&
+            #end if
+        #elif $reference_source.reference_source_selector == 'cached'
+            ln -sf '$reference_source.ref_file.fields.path' 'ref.fna' &&
+        #end if]]>
+    </token>
+
+    <token name="@REFERENCE_COMMAND@">
+        <![CDATA[
+        #if $reference_source.reference_source_selector == 'history'
+            #if $reference_source.ref_file.is_of_type("fasta")
+                --ref 'ref.fna'
+            #elif $reference_source.ref_file.is_of_type("genbank")
+                --ref 'ref.gbk'
+            #end if
+        #elif $reference_source.reference_source_selector == 'cached'
+            --ref 'ref.fna'
+        #end if
+        ]]>
+    </token>
+
+    <xml name="reference_selector">
+        <conditional name="reference_source">
+            <param name="reference_source_selector" type="select" label="Will you select a reference genome from your history or use a built-in index?" help="Built-ins were indexed using default options. See `Indexes` section of help below. If you would like to perform self-mapping select `history` here, then choose your input file as reference.">
+                <option value="cached">Use a built-in genome index</option>
+                <option value="history">Use a genome from history and build index</option>
+            </param>
+            <when value="cached">
+                <param name="ref_file" type="select" label="Using reference genome" help="Select genome from the list">
+                    <options from_data_table="all_fasta">
+                        <validator type="no_options" message="No reference genomes are available" />
+                    </options>
+                </param>
+            </when>
+            <when value="history">
+                <param name="ref_file" type="data" format="fasta,genbank" label="Use the following dataset as the reference sequence" help="You can upload a FASTA or FASTQ sequence to the history and use it as reference" />
+            </when>
+        </conditional>
+    </xml>
+
+    <token name="@VERSION@">4.4.3</token>
 
     <xml name="citations">
       <citations>