languages/java: add extension maven.nvim

modules/plugins/languages/java.nix

@@ -7,8 +7,9 @@
   inherit (lib.options) literalExpression mkEnableOption mkOption;
   inherit (lib.modules) mkIf mkMerge;
   inherit (lib) genAttrs;
-  inherit (lib.types) listOf;
-  inherit (lib.nvim.types) mkGrammarOption enumWithRename;
+  inherit (lib.types) listOf str;
+  inherit (lib.meta) getExe;
+  inherit (lib.nvim.types) mkGrammarOption mkPluginSetupOption enumWithRename;
 
   cfg = config.vim.languages.java;
 
@@ -46,6 +47,26 @@ in {
         description = "Java LSP server to use";
       };
     };
+    extensions = {
+      maven-nvim = {
+        enable = mkEnableOption "maven integration";
+        setupOpts = mkPluginSetupOption "maven-nvim" {
+          mvn_executable = mkOption {
+            type = str;
+            default = getExe pkgs.maven;
+            defaultText = literalExpression "getExe pkgs.maven";
+            description = ''
+              The maven executable to use.
+            '';
+            example = ''
+              - `"mvn"`: to use the maven from the `PATH`.
+              - `"./mvnw"`: to use the projects maven.
+              - `"$${getExe pkgs.maven}"`: to use maven from a nix package.
+            '';
+          };
+        };
+      };
+    };
   };
 
   config = mkIf cfg.enable (mkMerge [
@@ -62,5 +83,18 @@ in {
       vim.treesitter.enable = true;
       vim.treesitter.grammars = [cfg.treesitter.package];
     })
+
+    (mkIf cfg.extensions.maven-nvim.enable {
+      vim = mkMerge [
+        {
+          startPlugins = ["nui-nvim" "plenary-nvim"];
+          lazy.plugins.maven-nvim = {
+            package = "maven-nvim";
+            setupModule = "maven";
+            setupOpts = cfg.extensions.maven-nvim.setupOpts;
+          };
+        }
+      ];
+    })
   ]);
 }