From 95ae4c03c4df0adff9491f010287a6bca6fd6c2f Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Wed, 11 Oct 2023 12:08:47 +0200
Subject: [PATCH] neovim: Use nvim-jdtls

---
 users/simon/modules/neovim/default.nix |  1 +
 users/simon/modules/neovim/init.lua    | 63 ++++++++++++++++++++++++--
 2 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/users/simon/modules/neovim/default.nix b/users/simon/modules/neovim/default.nix
index 8d7f79b..7c068f8 100644
--- a/users/simon/modules/neovim/default.nix
+++ b/users/simon/modules/neovim/default.nix
@@ -84,6 +84,7 @@ in
       luasnip
       neogit
       nvim-cmp
+      nvim-jdtls
       nvim-lspconfig
       nvim-solarized-lua
       nvim-treesitter
diff --git a/users/simon/modules/neovim/init.lua b/users/simon/modules/neovim/init.lua
index cd6a599..009f7c7 100644
--- a/users/simon/modules/neovim/init.lua
+++ b/users/simon/modules/neovim/init.lua
@@ -299,10 +299,6 @@ lsp.hls.setup {
     on_attach = on_attach,
     root_dir = lsp.util.root_pattern('*.cabal', 'stack.yaml', 'cabal.project', 'package.yaml', 'hie.yaml', '.git'),
 }
-lsp.jdtls.setup {
-    on_attach = on_attach,
-    cmd = {'jdt-language-server', '-configuration', '/home/simon/.cache/jdtls/config', '-data', '/home/simon/.cache/jdtls/workspace'}, -- copied from upstream, but changed executable name
-}
 lsp.ltex.setup {
     on_attach = on_attach,
     settings = {
@@ -361,6 +357,65 @@ lsp.rust_analyzer.setup {
     },
 }
 
+vim.api.nvim_create_autocmd({"FileType"}, {
+    pattern = "java",
+    callback = function()
+        local jdtls = require('jdtls')
+
+        local config = {
+            cmd = {
+                'jdt-language-server',
+                '-configuration', vim.fn.expand('~') .. '/.cache/jdtls/config',
+                '-data', vim.fn.expand('~') .. '/.local/share/jdtls/workspace/' .. vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t'),
+            },
+
+            -- https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request
+            settings = {
+                java = {
+                    signatureHelp = { enabled = true };
+                    completion = {
+                        favoriteStaticMembers = {
+                        },
+                        filteredTypes = {
+                            "com.sun.*",
+                            "java.awt.*",
+                            "jdk.*",
+                            "sun.*",
+                        },
+                    };
+                    maven = {
+                        downloadSources = true,
+                    },
+
+                    implementationsCodeLens = {
+                        enabled = true,
+                    },
+                    referencesCodeLens = {
+                        enabled = true,
+                    },
+                },
+            },
+
+            on_attach = function(client, bufnr)
+                on_attach(client, bufnr) -- global lsp configuration
+
+                jdtls.setup.add_commands()
+
+                local opts = { noremap = true, silent = true }
+
+                vim.keymap.set('n', '<Leader>jo', jdtls.organize_imports, opts)
+                vim.keymap.set('n', '<Leader>jtc', jdtls.test_class, opts)
+                vim.keymap.set('n', '<Leader>jtm', jdtls.test_nearest_method, opts)
+                vim.keymap.set('n', '<Leader>jev', jdtls.extract_variable, opts)
+                vim.keymap.set('v', '<Leader>jem', [[<ESC><CMD>lua require('jdtls').extract_method(true)<CR>]], opts)
+                vim.keymap.set('n', '<Leader>jec', jdtls.extract_constanconstant, opts)
+            end,
+        }
+
+        jdtls.start_or_attach(config)
+    end
+})
+
 require('trouble').setup {}
 
 -- Tree Sitter