--- a/prosodyctl	Fri Jun 07 13:09:01 2019 +0100
+++ b/prosodyctl	Thu Jun 20 19:17:47 2019 +0100
@@ -85,6 +85,19 @@
 local commands = {};
 local command = table.remove(arg, 1);
 
+function commands.list(arg)
+  -- Need to think about the case with many flags
+  local flag="--tree="
+  -- I'm considering the flag is the first, but there can be many flags
+  if arg[1] and arg[1]:sub(1, #flag) == flag then
+    local dir = arg[1]:match("=(.+)$")
+    -- These extra double brackets allow us to correctly process names with spaces
+    os.execute("luarocks list --tree=".."'"..dir.."'")
+  else
+    os.execute("luarocks list --tree="..prosody.paths.data.."/rocks")
+  end
+end
+
 function commands.enabled_plugins()
 	for module in modulemanager.get_modules_for_host() do
 		show_warning("%s", module)