python.lua

local dap = require("dap")

--- @return string|nil
local function get_python_path()
  -- always prioritize python from venv
  local cwd = vim.fn.getcwd()
  if vim.fn.executable(cwd .. "/venv/bin/python") == 1 then
    return cwd .. "/venv/bin/python"
  elseif vim.fn.executable(cwd .. "/.venv/bin/python") == 1 then
    return cwd .. "/.venv/bin/python"
  end

  -- if not in venv, then use (if available) globally installed python3(.exe)
  if vim.fn.has("win64") == 1 then
    -- on Windows, vim.fn.executable("python3") returns 0 even if it is in PATH
    if vim.fn.executable("python") == 1 then
      return "python"
    end
  else -- linux, macos
    if vim.fn.executable("python3") == 1 then
      return "python3"
    elseif vim.fn.executable("/usr/bin/python3") == 1 then
      return "/usr/bin/python3"
    end
  end

  -- otherwise prompt the user for python3 executable path
  --- @type string
  local chosen_path
  vim.ui.input(
    { prompt = "provide absolute path to Python (to run debugpy): " },
    function(result)
      chosen_path = result
    end
  )
  if vim.fn.executable(chosen_path) == 1 then
    return chosen_path
  else
    vim.notify("you have provided an invalid Python path", vim.log.levels.ERROR)
    return nil
  end
end

dap.adapters.python = function(cb, _)
  local python_path = get_python_path()
  cb({
    type = "executable",
    -- to directly provide a python path, replace the python_path with "your-path-to-python",
    command = python_path,
    args = { "-m", "debugpy.adapter" },
    options = {
      source_filetype = "python",
    },
  })
end
dap.adapters.debugpy = dap.adapters.python

-- make sure not to override other C# DAP configs
if dap.configurations.python == nil then
  dap.configurations.python = {}
end

table.insert(dap.configurations.python, {
  type = "python",
  request = "launch",
  name = "Launch file",

  -- options below are for debugpy, see https://github.com/microsoft/debugpy/wiki/Debug-configuration-settings

  program = "${file}", -- This configuration will launch the current file if used.
  pythonPath = get_python_path(),
})