feat: Initial jdtls support

configuration.nix

@@ -64,6 +64,7 @@ inputs: let
           enable = isMaximal;
           crates.enable = true;
         };
+        java.enable = isMaximal;
         ts.enable = isMaximal;
         svelte.enable = isMaximal;
         go.enable = isMaximal;

modules/languages/default.nix

@@ -23,6 +23,7 @@ in {
     ./zig.nix
     ./html.nix
     ./svelte.nix
+    ./java.nix
   ];
 
   options.vim.languages = {

modules/languages/java.nix

@@ -0,0 +1,45 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.languages.java;
+in {
+  options.vim.languages.java = {
+    enable = mkEnableOption "Java language support";
+
+    treesitter = {
+      enable = mkEnableOption "Enable Java treesitter" // {default = config.vim.languages.enableTreesitter;};
+      package = nvim.types.mkGrammarOption pkgs "java";
+    };
+
+    lsp = {
+      enable = mkEnableOption "Java LSP support (java-language-server)" // {default = config.vim.languages.enableLSP;};
+
+      package = mkOption {
+        description = "java language server";
+        type = types.package;
+        default = pkgs.jdt-language-server;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.jdtls = ''
+        lspconfig.jdtls.setup {
+          cmd = {"${cfg.lsp.package}/bin/jdt-language-server", "-data", vim.fn.stdpath("cache").."/jdtls/workspace"},
+        }
+      '';
+    })
+
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+  ]);
+}