[nvim] add java LSP suppport

nvim/ftplugin/java.lua

@@ -0,0 +1,33 @@
+local markers = { '.git', 'mvnw', 'gradlew', 'pom.xml', 'build.gradle', 'build.gradle.kts', 'settings.gradle', 'settings.gradle.kts' }
+local file_path = vim.api.nvim_buf_get_name(0)
+local root_dir = vim.fs.root(0, markers) or vim.fs.dirname(file_path)
+
+if not root_dir then
+  vim.notify('JDTLS was not started: the current buffer has no file path.', vim.log.levels.WARN)
+  return
+end
+
+local jdtls_cmd = vim.fn.exepath('jdtls')
+if jdtls_cmd == '' then
+  vim.notify('JDTLS was not started: install jdtls and make it available on PATH.', vim.log.levels.WARN)
+  return
+end
+
+local workspace_dir = vim.fn.stdpath('data') .. '/jdtls-workspaces/' .. vim.fn.sha256(root_dir)
+vim.fn.mkdir(workspace_dir, 'p')
+
+local handlers = require('user.lsp.handlers')
+local config = {
+  cmd = { jdtls_cmd, '-data', workspace_dir },
+  root_dir = root_dir,
+  capabilities = handlers.capabilities,
+  on_attach = function(client, bufnr)
+    handlers.on_attach(client, bufnr)
+    local opts = { buffer = bufnr, silent = true }
+    vim.keymap.set('n', '<leader>oi', require('jdtls').organize_imports, opts)
+  end,
+  init_options = { bundles = {} },
+  settings = { java = {} },
+}
+
+require('jdtls').start_or_attach(config)

nvim/lua/user/cmp.lua

@@ -66,13 +66,19 @@ cmp.setup {
     end,
   },
   window = {
-    documentation = cmp.config.window.bordered()
+    completion = cmp.config.window.bordered(),
+    documentation = cmp.config.window.bordered({
+      max_height = 10,
+      max_width = 80,
+    }),
   },
   mapping = {
     ['<C-k>'] = cmp.mapping.select_prev_item(),
     ['<C-j>'] = cmp.mapping.select_next_item(),
     ['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-1), { 'i', 'c' }),
     ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(1), { 'i', 'c' }),
+    ['<C-u>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
+    ['<C-d>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
     ['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
     ['<C-y>'] = cmp.config.disable, -- Specify `cmp.config.disable` if you want to remove the default `<C-y>` mapping.
     ['<C-e>'] = cmp.mapping {

nvim/lua/user/lsp/handlers.lua

@@ -77,7 +77,7 @@ local function lsp_keymaps(bufnr)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
   -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
-  -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
   -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>f', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '[d', '<cmd>lua vim.diagnostic.goto_prev({ border = "rounded" })<CR>', opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', ']d', '<cmd>lua vim.diagnostic.goto_next({ border = "rounded" })<CR>', opts)

nvim/lua/user/lsp/lsp_installer.lua

@@ -20,6 +20,8 @@ local opts = {
 
 -- lua_ls config
 lspconfig.lua_ls.setup {
+  on_attach = opts.on_attach,
+  capabilities = opts.capabilities,
   settings = {
     Lua = {
       runtime = {
@@ -41,53 +43,54 @@ lspconfig.lua_ls.setup {
 -- python
 local pyright_settings = require('user.lsp.settings.pyright').settings
 lspconfig.pyright.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
   settings = pyright_settings
 }
 
 local pylsp_settings = require('user.lsp.settings.pylsp').settings
 lspconfig.pylsp.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
   settings = pylsp_settings
 }
 
 -- json
 local jsonls_settings = require('user.lsp.settings.jsonls').settings
 lspconfig.jsonls.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
   settings = jsonls_settings
 }
 
 -- ruby
 lspconfig.solargraph.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 
 -- md
 lspconfig.marksman.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 
 -- astro
 lspconfig.astro.setup({
+  on_attach = opts.on_attach,
   capabilities = require("cmp_nvim_lsp").default_capabilities(),
   filetypes = { "astro" },
 })
 
 -- ts
 lspconfig.ts_ls.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 
 -- eslint
 lspconfig.eslint.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 
@@ -101,13 +104,13 @@ lspconfig.gopls.setup {
 
 -- css
 lspconfig.cssls.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 
 -- bash
 lspconfig.bashls.setup {
-  attach = opts.on_attach,
+  on_attach = opts.on_attach,
   capabilities = opts.capabilities,
 }
 

nvim/lua/user/plugins.lua

@@ -69,6 +69,7 @@ return packer.startup(function(use)
   -- lsp
   use 'neovim/nvim-lspconfig'
   use 'williamboman/nvim-lsp-installer'
+  use 'mfussenegger/nvim-jdtls'
   use ({
     'nvimdev/lspsaga.nvim',
     after = 'nvim-lspconfig',
@@ -240,6 +241,7 @@ return packer.startup(function(use)
   use 'ThePrimeagen/vim-be-good'
   use { 'echasnovski/mini.map', branch = 'stable' }
   use "sbdchd/neoformat"
+  use 'stevearc/conform.nvim'
 
   if PACKER_BOOTSTRAP then
     require('packer').sync()

nvim/lua/user/plugins_configs/conform.lua

@@ -0,0 +1,24 @@
+local ok, conform = pcall(require, 'conform')
+if not ok then
+  return
+end
+
+conform.setup {
+  formatters = {
+    project_google_java_format = {
+      command = 'google-java-format',
+      condition = function()
+        return vim.fn.executable('google-java-format') == 1
+      end,
+      stdin = true,
+    },
+  },
+  formatters_by_ft = {
+    java = { 'project_google_java_format' },
+  },
+  format_on_save = function(bufnr)
+    if vim.bo[bufnr].filetype == 'java' then
+      return { timeout_ms = 3000, lsp_format = 'never' }
+    end
+  end,
+}

nvim/lua/user/plugins_configs/init.lua

@@ -1,4 +1,5 @@
 require('user.plugins_configs.bufferline')
+require('user.plugins_configs.conform')
 require('user.plugins_configs.floaterm')
 require('user.plugins_configs.gitsigns')
 require('user.plugins_configs.blame')
@@ -24,4 +25,3 @@ require('user.plugins_configs.ts_autotag')
 -- require('user.plugins_configs.solar_client')
 -- winbar requires NeoVim nightly, aka 0.9.x
 -- require('user.plugins.winbar')
-

nvim/lua/user/plugins_configs/treesitter.lua

@@ -14,6 +14,7 @@ configs.setup {
     'ruby',
     'python',
     'go',
+    'java',
     'sql',
     'markdown',
     'astro',