Create dap response inside a dap.listener

[frere-jacques]

Problem Statement

I want to set up probe-rs for nvim dap. Probe-rs uses dap events to configure and provide RTT prints over dap in a debug session. See the discussion 1259.

The debugger sends an event "probe-rs-rtt-channel-config". If this event is not responded with a dap response, the following prints in the code will not be sent as dap events.

So setting up a listener on "probe-rs-rtt-channel-config" that extracts the content is not sufficient.

Possible Solutions

If there is a function to create dap repsonses inside the listener function. One could establish this communication channel within nvim-dap.

Maybe it's already there, but I couldn't find it in the dap.txt.

Considered Alternatives

No response

[frere-jacques]

Okay, after I read through the source code, I eventually found the response and request function in the session module.

And the description about the session object. With a bit of try and error I found that I can do something like this:

    dap.listeners.before["event_probe-rs-rtt-channel-config"]["plugins.nvim-dap-probe-rs"] = function(session, body)
      session:request("rttWindowOpened", { body.channelNumber, true })
end

With this I managed to get the debugger to send the data printed to the RTT channel. If I find out how to print to the log or repl in nvim-dap-ui, I think I have all parts at hand to complete this.

[frere-jacques]

For anybody searching how you can print to the dap-repl of nvim-dap instead of nvim repl.

local repl = require "dap.repl"
repl.append(vim.inspect(body.data))

I would prefer to print to the dapui_console instead, but, I couldn't find anything.