Collapse help into expandable command topics

plugins/nginx-vhosts/commands

@@ -4,11 +4,25 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | nginx:help)
-    cat<<EOF
+    help_content_func () {
+      declare desc="return help_content string"
+      cat<<help_content
     nginx:build-config <app>, (Re)builds nginx config for given app
     nginx:access-logs <app> [-t], Show the nginx access logs for an application (-t follows)
     nginx:error-logs <app> [-t], Show the nginx error logs for an application (-t follows)
-EOF
+help_content
+    }
+
+    if [[ $1 = "nginx:help" ]] ; then
+        echo -e 'Usage: dokku nginx[:COMMAND]'
+        echo ''
+        echo 'Interact with Dokkus Nginx proxy.'
+        echo ''
+        echo 'Additional commands:'
+        help_content_func | sort | column -c2 -t -s,
+    else
+        help_content_func
+    fi
   ;;
 
   *)