Add nvim-dap & nvim-dap-view

Also don't enter insert mode when launching a debug session.

lua/plugins/debugger.lua

@@ -0,0 +1,57 @@
+return {
+  'mfussenegger/nvim-dap',
+  dependencies = {
+    'igorlfs/nvim-dap-view',
+    'kbenzie/mason.nvim',
+    'jay-babu/mason-nvim-dap.nvim',
+    'theHamsta/nvim-dap-virtual-text',
+  },
+  config = function()
+    local dap = require('dap')
+
+    local debug_adapters = {
+      'codelldb', -- C/C++/Rust/Zig
+    }
+
+    if vim.fn.executable('pip') == 1 then
+      for _, package in ipairs({
+        'python', -- Python
+      }) do table.insert(debug_adapters, package) end
+    end
+
+    if vim.fn.executable('go') == 1 then
+      for _, package in ipairs({
+        'delve', -- Go
+      }) do table.insert(debug_adapters, package) end
+    end
+
+    require("mason-nvim-dap").setup({
+      ensure_installed = debug_adapters,
+      handlers = {},
+    })
+
+    -- UI plugins
+    require('dap-view').setup({})
+    require('nvim-dap-virtual-text').setup({})
+
+    vim.api.nvim_create_autocmd({ "FileType" }, {
+      pattern = {
+        'dap-float',
+      },
+      callback = function(args)
+        vim.keymap.set("n", "q", "<C-w>q", { buffer = args.buf })
+      end,
+    })
+
+    local widgets = require('dap.ui.widgets')
+
+    vim.keymap.set('n', '<F5>', dap.continue)
+    vim.keymap.set('n', '<F17>', dap.terminate)        -- Shift-F5
+    vim.keymap.set('n', '<F9>', dap.toggle_breakpoint)
+    vim.keymap.set('n', '<F21>', vim.cmd.DapViewWatch) -- Shift-F9
+    vim.keymap.set('n', '<F11>', dap.step_into)
+    vim.keymap.set('n', '<F23>', dap.step_out)         -- Shift-F11
+    vim.keymap.set('n', '<F10>', dap.step_over)
+    vim.keymap.set('n', '<leader>K', widgets.hover)
+  end,
+}

plugin/autocmds.lua

@@ -25,10 +25,17 @@ vim.api.nvim_create_autocmd('BufRead', {
 
 -- Start terminals in insert mode
 vim.api.nvim_create_autocmd('TermOpen', {
-  group = group, pattern = 'term://*',
-  callback = function()
-    vim.cmd.startinsert()
+  group = group,
+  pattern = 'term://*',
+  callback = function(args)
+    -- nvim-dap/nvim-dap-view uses terminal buffers in the background which are
+    -- not visible, don't start insert mode if the dap-type variable exists.
+    local success, dap_type = pcall(vim.api.nvim_buf_get_var, args.buf, 'dap-type')
+    if success and dap_type then
+      return
     end
+    vim.cmd.startinsert()
+  end,
 })
 
 -- Automatically press enter when the terminal process exit successfully