Collapse help into expandable command topics

plugins/tar/commands

@@ -4,10 +4,24 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | tar:help)
-    cat<<EOF
+    help_content_func () {
+      declare desc="return help_content string"
+      cat<<help_content
     tar:in <app>, Reads an tarball containing the app from stdin
     tar:from <app> <url>, Loads an app tarball from url.
-EOF
+help_content
+    }
+
+    if [[ $1 = "tar:help" ]] ; then
+        echo -e 'Usage: dokku tar[:COMMAND]'
+        echo ''
+        echo 'An alternative to using git, apps are loaded via tarballs instead.'
+        echo ''
+        echo 'Additional commands:'
+        help_content_func | sort | column -c2 -t -s,
+    else
+        help_content_func
+    fi
     ;;
 
   *)