nixos: gen 45 @ lilac — 2026-09-18 08:18 26.05.20260814.02e0898 (Yarara) ----- refactoring nvim.nix and adding better java integration

home/programs/nvim.nix

@@ -1,5 +1,8 @@
 { config, pkgs, ... }:
 
+let
+  javaDebug = pkgs.vscode-extensions.vscjava.vscode-java-debug;
+in
 {
   programs.neovim = {
     enable = true;
@@ -27,9 +30,8 @@
       vim.opt.updatetime = 50
       vim.opt.foldmethod = "indent"
       vim.opt.foldlevel = 99
-  
+
       vim.g.mapleader = " "
-      vim.keymap.set("n", "<leader>", ":")
       vim.keymap.set("n", "<leader>w", "<cmd>w<CR>", { silent = true })
       vim.keymap.set("n", "<leader>q", "<cmd>q<CR>", { silent = true })
       vim.keymap.set("n", "<leader>wq", "<cmd>wq<CR>", { silent = true })
@@ -67,7 +69,7 @@
       })
 
       require("lualine").setup({
-        ons = { theme = "auto" },
+        options = { theme = "auto" },
       })
 
       require("neocord").setup({
@@ -86,7 +88,14 @@
         },
       })
 
-      -- Java indentation must match Eclipse's formatter, not your 2-space default.
+      -- Indent is left off deliberately: treesitter's Java indent fights the
+      -- Eclipse-matching tab settings applied in the FileType autocmd below.
+      require("nvim-treesitter.configs").setup({
+        highlight = { enable = true },
+        indent = { enable = false },
+      })
+
+      -- Java indentation must match Eclipse's formatter, not the 2-space default.
       vim.api.nvim_create_autocmd("FileType", {
         pattern = "java",
         callback = function()
@@ -117,24 +126,41 @@
 
       local capabilities = require("cmp_nvim_lsp").default_capabilities()
 
-      -- .project and .classpath come first so a repo containing several
-      -- assignments resolves to the assignment, not the repo root.
-      local root_markers = { ".project", ".classpath", "pom.xml", "build.gradle", ".git" }
+      local bundles = vim.fn.glob(
+        "${javaDebug}/share/vscode/extensions/vscjava.vscode-java-debug/server/com.microsoft.java.debug.plugin-*.jar",
+        true, true)
+      if #bundles == 0 then
+        vim.notify("java-debug bundle not found - Java debugging disabled", vim.log.levels.WARN)
+      end
+
+      local java_home = os.getenv("JAVA_HOME")
+      if not java_home then
+        vim.notify("JAVA_HOME unset - jdtls will guess a runtime", vim.log.levels.WARN)
+      end
+
+      -- Eclipse metadata wins over build files, build files over .git, and the
+      -- file's own directory is the last resort so bare folders still attach.
+      local function find_project_root()
+        local setup = require("jdtls.setup")
+        return setup.find_root({ ".project", ".classpath" })
+            or setup.find_root({ "pom.xml", "build.gradle", "build.gradle.kts" })
+            or setup.find_root({ ".git" })
+            or vim.fn.expand("%:p:h")
+      end
+
+      local dap_configured = false
 
       local function start_jdtls()
         local jdtls = require("jdtls")
-        local root_dir = require("jdtls.setup").find_root(root_markers)
-        if not root_dir or root_dir == "" then return end
+        local root_dir = find_project_root()
 
         local project_name = vim.fn.fnamemodify(root_dir, ":p:h:t")
+          .. "-" .. vim.fn.sha256(root_dir):sub(1, 8)
         local workspace = vim.fn.stdpath("cache") .. "/jdtls-workspaces/" .. project_name
 
         local java_settings = {
           configuration = {
-            updateBuildConfiguration = "interactive",
-            runtimes = {
-              { name = "JavaSE-21", path = os.getenv("JAVA_HOME"), default = true },
-            },
+            updateBuildConfiguration = "automatic",
           },
           -- Keep a stray pom.xml from overriding the Eclipse project model.
           -- Flip these on if a course actually requires Maven or Gradle.
@@ -142,10 +168,20 @@
             maven = { enabled = false },
             gradle = { enabled = false },
           },
+          project = {
+            outputPath = "bin",
+            referencedLibraries = { "lib/**/*.jar" },
+          },
           signatureHelp = { enabled = true },
           eclipse = { downloadSources = true },
         }
 
+        if java_home then
+          java_settings.configuration.runtimes = {
+            { name = "JavaSE-21", path = java_home, default = true },
+          }
+        end
+
         -- If the repo carries an exported Eclipse formatter profile, use it verbatim.
         local formatter = root_dir .. "/.settings/eclipse-formatter.xml"
         if vim.uv.fs_stat(formatter) then
@@ -157,8 +193,14 @@
           root_dir = root_dir,
           capabilities = capabilities,
           settings = { java = java_settings },
-          init_options = { bundles = {} },
+          init_options = { bundles = bundles },
           on_attach = function(_, bufnr)
+            require("jdtls").setup_dap({ hotcodereplace = "auto" })
+            if not dap_configured then
+              dap_configured = true
+              require("jdtls.dap").setup_dap_main_class_configs()
+            end
+
             local map = function(k, f) vim.keymap.set("n", k, f, { buffer = bufnr, silent = true }) end
             map("gd", vim.lsp.buf.definition)
             map("gr", vim.lsp.buf.references)
@@ -176,15 +218,25 @@
         callback = start_jdtls,
       })
 
-      require("neotest").setup({
-        adapters = {
-          require("neotest-java")({
-            junit_jar = vim.uv.os_homedir() .. "/dev/jars/junit-*.jar",
-            -- jvm_args = { "-Xmx512m" },
-            incremental_build = true,
-          }),
-        },
-      })
+      local dap, dapui = require("dap"), require("dapui")
+      dapui.setup()
+      require("nvim-dap-virtual-text").setup()
+
+      dap.listeners.after.event_initialized["dapui"] = function() dapui.open() end
+      dap.listeners.before.event_terminated["dapui"] = function() dapui.close() end
+      dap.listeners.before.event_exited["dapui"] = function() dapui.close() end
+
+      vim.keymap.set("n", "<leader>db", dap.toggle_breakpoint)
+      vim.keymap.set("n", "<leader>dB", function()
+        dap.set_breakpoint(vim.fn.input("Condition: "))
+      end)
+      vim.keymap.set("n", "<leader>dc", dap.continue)
+      vim.keymap.set("n", "<leader>dn", dap.step_over)
+      vim.keymap.set("n", "<leader>di", dap.step_into)
+      vim.keymap.set("n", "<leader>du", dap.step_out)
+      vim.keymap.set("n", "<leader>dr", dap.repl.toggle)
+      vim.keymap.set("n", "<leader>dq", dap.terminate)
+      vim.keymap.set({ "n", "v" }, "<leader>de", function() dapui.eval() end)
     '';
 
     plugins = with pkgs.vimPlugins; [
@@ -197,11 +249,9 @@
       { plugin = gitsigns-nvim; }
 
       { plugin = nvim-jdtls; }
-      { plugin = nvim-nio; }
-      { plugin = neotest; }
-      { plugin = neotest-java; }
       { plugin = nvim-dap; }
       { plugin = nvim-dap-ui; }
+      { plugin = nvim-nio; }
       { plugin = nvim-dap-virtual-text; }
       { plugin = nvim-cmp; }
       { plugin = cmp-nvim-lsp; }