nvim-config/lua/plugins/dap.lua

-- Debug Adapter Protocol (DAP) configuration for Go
-- Uses delve for Go debugging

return {
  -- nvim-dap configuration
  {
    "mfussenegger/nvim-dap",
    dependencies = {
      -- Go-specific DAP configuration
      {
        "leoluz/nvim-dap-go",
        opts = {
          -- Delve configurations
          delve = {
            -- Path to delve (uses Mason-installed by default)
            path = "dlv",
            -- Initialize with default args
            initialize_timeout_sec = 20,
            -- Whether to use debug adapter mode
            port = "${port}",
            -- Build flags for delve
            build_flags = "",
          },
          -- DAP configurations for Go
          dap_configurations = {
            {
              type = "go",
              name = "Debug",
              request = "launch",
              program = "${file}",
            },
            {
              type = "go",
              name = "Debug Package",
              request = "launch",
              program = "${fileDirname}",
            },
            {
              type = "go",
              name = "Debug test",
              request = "launch",
              mode = "test",
              program = "${file}",
            },
            {
              type = "go",
              name = "Debug test (go.mod)",
              request = "launch",
              mode = "test",
              program = "./${relativeFileDirname}",
            },
            {
              type = "go",
              name = "Attach",
              request = "attach",
              mode = "local",
              processId = require("dap.utils").pick_process,
            },
          },
        },
      },
    },
    keys = {
      -- Debug keymaps
      { "<leader>dB", function() require("dap").set_breakpoint(vim.fn.input("Breakpoint condition: ")) end, desc = "Breakpoint Condition" },
      { "<leader>db", function() require("dap").toggle_breakpoint() end,                                    desc = "Toggle Breakpoint" },
      { "<leader>dc", function() require("dap").continue() end,                                             desc = "Continue" },
      { "<leader>dC", function() require("dap").run_to_cursor() end,                                        desc = "Run to Cursor" },
      { "<leader>dg", function() require("dap").goto_() end,                                                desc = "Go to Line (No Execute)" },
      { "<leader>di", function() require("dap").step_into() end,                                            desc = "Step Into" },
      { "<leader>dj", function() require("dap").down() end,                                                 desc = "Down" },
      { "<leader>dk", function() require("dap").up() end,                                                   desc = "Up" },
      { "<leader>dl", function() require("dap").run_last() end,                                             desc = "Run Last" },
      { "<leader>do", function() require("dap").step_out() end,                                             desc = "Step Out" },
      { "<leader>dO", function() require("dap").step_over() end,                                            desc = "Step Over" },
      { "<leader>dp", function() require("dap").pause() end,                                                desc = "Pause" },
      { "<leader>dr", function() require("dap").repl.toggle() end,                                          desc = "Toggle REPL" },
      { "<leader>ds", function() require("dap").session() end,                                              desc = "Session" },
      { "<leader>dt", function() require("dap").terminate() end,                                            desc = "Terminate" },
      { "<leader>dw", function() require("dap.ui.widgets").hover() end,                                     desc = "Widgets" },
      -- Go-specific
      { "<leader>dT", function() require("dap-go").debug_test() end,                                        desc = "Debug Go Test" },
      { "<leader>dL", function() require("dap-go").debug_last_test() end,                                   desc = "Debug Last Go Test" },
    },
  },

  -- DAP UI for better debugging experience
  {
    "rcarriga/nvim-dap-ui",
    dependencies = {
      "mfussenegger/nvim-dap",
      "nvim-neotest/nvim-nio",
    },
    keys = {
      { "<leader>du", function() require("dapui").toggle({}) end, desc = "Dap UI" },
      { "<leader>de", function() require("dapui").eval() end,     desc = "Eval",  mode = { "n", "v" } },
    },
    opts = {
      layouts = {
        {
          elements = {
            { id = "scopes",      size = 0.25 },
            { id = "breakpoints", size = 0.25 },
            { id = "stacks",      size = 0.25 },
            { id = "watches",     size = 0.25 },
          },
          position = "left",
          size = 40,
        },
        {
          elements = {
            { id = "repl",    size = 0.5 },
            { id = "console", size = 0.5 },
          },
          position = "bottom",
          size = 10,
        },
      },
    },
    config = function(_, opts)
      local dap = require("dap")
      local dapui = require("dapui")

      dapui.setup(opts)

      -- Auto open/close DAP UI
      dap.listeners.after.event_initialized["dapui_config"] = function()
        dapui.open({})
      end
      dap.listeners.before.event_terminated["dapui_config"] = function()
        dapui.close({})
      end
      dap.listeners.before.event_exited["dapui_config"] = function()
        dapui.close({})
      end
    end,
  },
  {
    "jay-babu/mason-nvim-dap.nvim",
    opts = {
      ensure_installed = {
        "python",
        "delve",
        "js"
      },
    },
  },
  -- Virtual text for debugging
  {
    "theHamsta/nvim-dap-virtual-text",
    opts = {
      enabled = true,
      enabled_commands = true,
      highlight_changed_variables = true,
      highlight_new_as_changed = false,
      show_stop_reason = true,
      commented = false,
      only_first_definition = true,
      all_references = false,
      filter_references_pattern = "<module",
      virt_text_pos = "eol",
      all_frames = false,
      virt_lines = false,
      virt_text_win_col = nil,
    },
  },
}