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-- Python launch configs (nvim-dap-python), wired to the debugpy adapter
-- that mason-nvim-dap.nvim installs (dap.lua). Kept in its own file since
-- this is the "per-language" half of debugging, parallel to how
-- ftplugin/python.lua holds Python-only settings.
return {
"mfussenegger/nvim-dap-python",
-- Not left to lazy-load off `ft = "python"`: dap.lua's <leader>dc picker
-- works from any window (not just a Python buffer) and needs
-- dap.adapters.python already registered by the time a config is picked,
-- even if no .py buffer has been opened yet this session.
lazy = false,
-- mason.nvim is listed directly (not just transitively via dap.lua)
-- because config() below needs require("mason-registry") to be loadable
-- from startup, same reasoning as lazy = false above.
dependencies = { "mfussenegger/nvim-dap", "mason-org/mason.nvim" },
config = function()
local registry = require("mason-registry")
local pkg = registry.get_package("debugpy")
-- debugpy_path is the interpreter that runs the debug *adapter* itself
-- (Mason's isolated venv) - it does not control which Python runs your
-- script. dap-python defaults that to the active venv/system python3;
-- project-specific venvs may need a manual `pythonPath` override in a
-- generated launch config later.
local debugpy_path = pkg:get_install_path() .. "/venv/bin/python"
local function setup()
require("dap-python").setup(debugpy_path)
-- nvim-dap-python doesn't expose adapter.options for tuning, and
-- nvim-dap's default terminate-request timeout (3s) is tight enough
-- that debugpy's real response can arrive just after nvim-dap already
-- gave up and moved on ("No callback found" in dap.log) - <leader>dt
-- still works, but dap.session() doesn't clear for a few extra
-- seconds, so <leader>dc right after can catch it still "active".
-- Wrap the adapter dap-python just registered to give it more room.
local dap = require("dap")
local base_adapter = dap.adapters.python
dap.adapters.python = function(cb, config)
base_adapter(function(adapter)
adapter.options = adapter.options or {}
adapter.options.disconnect_timeout_sec = 8
cb(adapter)
end, config)
end
end
if pkg:is_installed() then
setup()
else
-- dap.lua's mason-nvim-dap ensure_installed triggers debugpy's
-- install, but that's async - on a fresh machine (or before it
-- finishes) debugpy_path doesn't exist on disk yet, and <leader>dc
-- would fail with a raw ENOENT from debugpy itself instead of a clear
-- message. Wire up the adapter once the install actually completes
-- instead of pointing it at a path that isn't there yet.
vim.notify(
"debugpy not installed yet - dap.lua's ensure_installed should be"
.. " installing it now (check :Mason); run :MasonInstall debugpy"
.. " if it doesn't show up there. Debugging will work once it's"
.. " done.",
vim.log.levels.WARN
)
registry:on("package:install:success", function(installed_pkg)
if installed_pkg.name == "debugpy" then
setup()
end
end)
end
end,
}
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