plugins/treesitter: add treesitter injections test file

Not a true automated test file, just good for a visual smoke test.

plugins/by-name/treesitter/test-injections.nix

@@ -0,0 +1,231 @@
+{ lib, pkgs, ... }:
+let
+  inherit (lib)
+    mkDefault
+    mkIf
+    mkMerge
+    mkOverride
+    mkRaw
+    ;
+in
+{
+  # ============================================================================
+  # SECTION 1: Direct string assignments
+  # ============================================================================
+  section1 = {
+    # Basic __raw
+    __raw = ''
+      vim.opt.number = true
+      print("hello")
+    '';
+
+    # Basic extraConfigLua
+    extraConfigLua = ''
+      require('telescope').setup()
+    '';
+
+    extraConfigLuaPre = "vim.g.loaded_netrw = 1";
+    extraConfigLuaPost = "print('done')";
+
+    # Vim config
+    extraConfigVim = ''
+      set number
+      nnoremap <leader>f :Telescope<CR>
+    '';
+  };
+
+  # ============================================================================
+  # SECTION 2: Single-level function application
+  # ============================================================================
+  section2 = {
+    # mkRaw function
+    __raw = mkRaw ''
+      local telescope = require('telescope')
+      telescope.setup({})
+    '';
+
+    # Other function with extraConfigLua
+    extraConfigLua = lib.mkRaw ''
+      vim.diagnostic.config({ virtual_text = false })
+    '';
+  };
+
+  # ============================================================================
+  # SECTION 3: Nested function wrappers
+  # ============================================================================
+  section3 = {
+    # mkOverride nested
+    extraConfigLua = mkIf true (
+      mkOverride 100 ''
+        require('lualine').setup()
+      ''
+    );
+
+    # Triple nested
+    luaConfig.content = mkIf true (
+      mkOverride 123 (mkDefault ''
+        vim.opt.termguicolors = true
+      '')
+    );
+  };
+
+  # ============================================================================
+  # SECTION 4: Lists and mkMerge
+  # ============================================================================
+  section4 = {
+    # mkMerge with list
+    extraConfigLua = mkMerge [
+      ''
+        vim.opt.number = true
+      ''
+      ''
+        vim.opt.relativenumber = true
+      ''
+    ];
+
+    # mkMerge with conditional items
+    __raw = mkMerge [
+      (mkIf true ''
+        print('conditional lua')
+      '')
+      ''
+        print('always runs')
+      ''
+    ];
+  };
+
+  # ============================================================================
+  # SECTION 5: luaConfig attribute patterns
+  # ============================================================================
+  section5 = {
+    # Direct luaConfig attrset
+    luaConfig = {
+      pre = ''
+        local M = {}
+      '';
+      content = ''
+        M.setup = function() end
+      '';
+      post = ''
+        return M
+      '';
+    };
+  };
+
+  # Nested identifier pattern (top-level to test dot notation)
+  luaConfig.pre = ''
+    vim.g.mapleader = ' '
+  '';
+
+  luaConfig.content = ''
+    require('config').setup()
+  '';
+
+  # luaConfig with triple nesting (dot notation)
+  luaConfig.post = mkIf true (
+    mkOverride 123 (mkDefault ''
+      vim.opt.termguicolors = true
+    '')
+  );
+
+  # ============================================================================
+  # SECTION 6: Pre/Post variants with wrappers
+  # ============================================================================
+  section6 = {
+    # extraConfigLuaPre with wrapped function
+    extraConfigLuaPre = mkIf true ''
+      vim.g.mapleader = ' '
+    '';
+
+    # extraConfigLuaPost with nested wrappers
+    extraConfigLuaPost = mkIf true (
+      mkOverride 100 ''
+        print('cleanup')
+      ''
+    );
+  };
+
+  # ============================================================================
+  # SECTION 7: Vim patterns (wrapped, nested, lists)
+  # ============================================================================
+  section7 = {
+    # Vim with wrapped function
+    extraConfigVim = mkIf true ''
+      set background=dark
+      colorscheme gruvbox
+    '';
+
+    # Vim with nested wrappers
+    extraConfigVimPre = mkIf true (
+      mkOverride 100 ''
+        set nocompatible
+        filetype plugin on
+      ''
+    );
+
+    # Vim with lists
+    extraConfigVimPost = mkMerge [
+      ''
+        set cursorline
+      ''
+      ''
+        set number
+      ''
+    ];
+  };
+
+  section7b = {
+    # Vim with mixed list + wrappers
+    extraConfigVim = mkMerge [
+      (mkIf true ''
+        nnoremap <leader>q :q<CR>
+      '')
+      ''
+        nnoremap <leader>w :w<CR>
+      ''
+    ];
+  };
+
+  # ============================================================================
+  # SECTION 8: luaConfig with wrapped functions
+  # ============================================================================
+  section8 = {
+    luaConfig = {
+      pre = mkIf true ''
+        vim.g.loaded_python_provider = 0
+      '';
+
+      content = mkOverride 50 ''
+        require('main').setup()
+      '';
+
+      post = ''
+        vim.notify('Config loaded')
+      '';
+    };
+  };
+
+  # ============================================================================
+  # SECTION 9: Edge cases
+  # ============================================================================
+  section9 = {
+    # Multiline with interpolation
+    extraConfigLua = ''
+      local path = "${pkgs.vimPlugins.telescope-nvim}"
+      print(path)
+    '';
+
+    # Nested attrset
+    plugins = {
+      telescope = {
+        __raw = ''
+          require('telescope').setup({
+            defaults = {
+              file_ignore_patterns = { "node_modules" }
+            }
+          })
+        '';
+      };
+    };
+  };
+}