How can I interop with nvim-dap launch.json?

[liquiddandruff]

I can set a breakpoint via require'dap'.toggle_breakpoint(), and :RustDebuggables behaves as expected: my breakpoint gets hit and the other dap commands like require'dap'.continue() work.

However once my session is finished, I often hit F5 again to start another debugging session (I have it bound via vim.keymap.set('n', '<F5>', require 'dap'.continue) which I use in other languages).

I tried getting something to work via:

.vscode/launch.json

{
   "version": "0.2.0",
   "configurations": [
       {
           "type": "rt_lldb",
           "request": "launch",
           "name": "Launch"
       }
   ]
}

but dap doesn't recognize this configuration. Pressing F5 results in:

No configuration found for `rust`. You need to add configs to `dap.configurations.rust` (See `:h dap-configuration`)

If instead I change the type from rt_lldb to rust, then of course I get

The selected configuration references adapter `rust`, but dap.adapters.rust is undefined since rt_lldb is the adapter called via :RustDebuggables.

So my question is, is there a way to get dap to use the rt_lldb adapter automatically? Maybe I should define dap.adapters.rust myself and make it call into rt_lldb somehow? But I'm not sure how to do that, or if that's the best way.

Any help on this would be appreciated, thank you!

[liquiddandruff]

Found it! :) From https://github.com/mfussenegger/nvim-dap/issues/20#issuecomment-1212214935

See :help dap.ext.vscode.load_launchjs

For the above configuration, calling load_launchjs adds the first entry to dap.configurations.java and the second entry to dap.configurations.cppdbg. If you wanted to add the second entry to the c or cpp configurations you could call load_launchjs like this instead:

require('dap.ext.vscode').load_launchjs(nil, { cppdbg = {'c', 'cpp'} })

So all we need is to remap the rt_lldb type to rust like so:

require('dap.ext.vscode').load_launchjs(nil, {rt_lldb= {'rust'} })

Ensure your cwd has '.vscode/launch.json' in path (if the path is nil, load_launchjs defaults to this).

Then pressing F5 starts a debugging session and everything works.

My full .vscode/launch.json:

{
   "version": "0.2.0",
   "configurations": [
       {
           "name": "Launch",
           "type": "rt_lldb",
           "request": "launch",
           "cwd": "${workspaceFolder}",
           "program": "${workspaceFolder}/target/debug/${workspaceFolderBasename}",
           "stopAtEntry": true
       }
   ]
}

I created a page to document this at https://github.com/simrat39/rust-tools.nvim/wiki/Use-with-dap.ext.vscode-launch.json