treewide: begin restructuring the module tree

modules/plugins/languages/go.nix

@@ -0,0 +1,138 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.meta) getExe;
+  inherit (lib.lists) isList;
+  inherit (lib.types) bool enum either listOf package str;
+  inherit (lib.nvim.types) mkGrammarOption;
+  inherit (lib.nvim.lua) expToLua;
+
+  cfg = config.vim.languages.go;
+
+  defaultServer = "gopls";
+  servers = {
+    gopls = {
+      package = pkgs.gopls;
+      lspConfig = ''
+        lspconfig.gopls.setup {
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/gopls", "serve"}''
+        },
+        }
+      '';
+    };
+  };
+
+  defaultDebugger = "delve";
+  debuggers = {
+    delve = {
+      package = pkgs.delve;
+      dapConfig = ''
+        dap.adapters.delve = {
+          type = "server",
+          port = "''${port}",
+          executable = {
+            command = "${getExe cfg.dap.package}",
+            args = { "dap", "-l", "127.0.0.1:''${port}" },
+          },
+        }
+
+        dap.configurations.go = {
+          {
+            type = "delve",
+            name = "Debug",
+            request = "launch",
+            program = "''${file}",
+          },
+          {
+            type = "delve",
+            name = "Debug test", -- configuration for debugging test files
+            request = "launch",
+            mode = "test",
+            program = "''${file}",
+          },
+          -- works with go.mod packages and sub packages
+          {
+            type = "delve",
+            name = "Debug test (go.mod)",
+            request = "launch",
+            mode = "test",
+            program = "./''${relativeFileDirname}",
+          },
+        }
+      '';
+    };
+  };
+in {
+  options.vim.languages.go = {
+    enable = mkEnableOption "Go language support";
+
+    treesitter = {
+      enable = mkEnableOption "Go treesitter" // {default = config.vim.languages.enableTreesitter;};
+
+      package = mkGrammarOption pkgs "go";
+    };
+
+    lsp = {
+      enable = mkEnableOption "Go LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "Go LSP server to use";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "Go LSP server package, or the command to run as a list of strings";
+        example = ''[lib.getExe pkgs.jdt-language-server " - data " " ~/.cache/jdtls/workspace "]'';
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+
+    dap = {
+      enable = mkOption {
+        description = "Enable Go Debug Adapter";
+        type = bool;
+        default = config.vim.languages.enableDAP;
+      };
+      debugger = mkOption {
+        description = "Go debugger to use";
+        type = enum (attrNames debuggers);
+        default = defaultDebugger;
+      };
+      package = mkOption {
+        description = "Go debugger package.";
+        type = package;
+        default = debuggers.${cfg.dap.debugger}.package;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.go-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+
+    (mkIf cfg.dap.enable {
+      vim.debugger.nvim-dap.enable = true;
+      vim.debugger.nvim-dap.sources.go-debugger = debuggers.${cfg.dap.debugger}.dapConfig;
+    })
+  ]);
+}