[FunToHard]

Summary

This pull request introduces offline CMake language intelligence and syntax highlighting for CMakeLists.txt and *.cmake, resolves continuous clangd destroyed stream error loops, and adds project build/run action options to the editor title Run button when a project file is focused.

1. CMake Syntax Highlighting & Language Configuration

• Added \syntaxes/CMake.tmLanguage.json\ and \syntaxes/CMakeCache.tmLanguage.json\ from TextMate grammar definitions.
• Added \syntaxes/cmake-language-configuration.json\ for comments (#), bracket matching, and auto-closing pairs.
• Registered \contributes.languages\ (\cmake\ and \cmake-cache) and \contributes.grammars\ in \package.json.
• Preserved packaging in .vscodeignore.

2. Clangd Stream Error Suppression & Watcher Isolation

• Root cause:
  1. \CMakeWatcher\ treated \CMakeLists.txt\ as a compilation database, triggering \daemonManager.restart()\ on every keystroke/save and double-reloading through \cmakeManager.refresh().
  2. \cmakeManager.synthesizeCompilationDatabase\ rewrote \compile_commands.json\ even when content did not change, creating an infinite reload loop.
  3. Pending \ extDocument/semanticTokens/full\ requests dispatched during stream teardown triggered \Cannot call write after a stream was destroyed Code: -32099\ because semantic tokens were not intercepted in middleware.
• Fix:
  • Added \isConnectionOrStreamError\ to classify stream teardown codes (-32099, -32097, ERR_STREAM_DESTROYED, stream disposed messages).
  • Implemented \provideDocumentSemanticTokens, \provideDocumentSemanticTokensEdits, and \provideDocumentRangeSemanticTokens\ middleware guards returning
    ull\ gracefully when the stream is closing/destroyed or when \isServerReady()\ is false.
  • Guarded \provideCompletionItem,
    esolveCompletionItem, \provideWorkspaceSymbols, \provideHover, \provideDefinition, \provideInlayHints, and \provideCodeActions\ against unready server states and connection dropouts.
  • Added \isServerReady()\ method to \DaemonManager\ and handled stream errors in \errorHandler.error\ with suppression logging.
  • Isolated \CMakeWatcher\ so CMake configuration edits only update AST/presets without restarting clangd unless compilation database contents actually change.
  • Made \synthesizeCompilationDatabase\ idempotent by comparing existing on-disk content before writing.

3. Offline IntelliSense for CMakeLists.txt & *.cmake

• Completion Item Provider (\CMakeLanguageService):
  • Autocompletion for 130 CMake commands with parameter snippets (\�dd_executable, \ arget_include_directories, \ arget_link_libraries, \ind_package, \project, \cmake_minimum_required, etc.).
  • Autocompletion for 1,362 built-in CMake variables (\CMAKE_CXX_STANDARD, \CMAKE_BUILD_TYPE, \CMAKE_CURRENT_SOURCE_DIR, \BUILD_SHARED_LIBS, etc.) with contextual triggering inside \.
  • Autocompletion for standard keywords and scoping modifiers (\PUBLIC, \PRIVATE, \INTERFACE, \REQUIRED, \COMPONENTS, \STATIC, \SHARED, \MODULE, \CONFIG, \WIN32, \PROPERTIES).
• Hover Provider:
  • Command hovers render signatures, parameter visibility breakdowns, and syntax examples in formatted markdown.
  • Variable hovers render descriptions, expected types, and default values.
  • Keyword hovers document scope propagation and behavior.

4. Project Run Button Options

• Added one-click project actions to the editor title Run button (\editor/title/run) when a project file is focused (\CMakeLists.txt, *.cmake, .sln, .slnx, .vcxproj):
  • Build & Run Project (\c-cpp-pro.buildAndRunProject)
  • Build Project (\c-cpp-pro.buildProject)
  • Build & Debug Project (\c-cpp-pro.buildAndDebugProject)
• Controller implemented in \ProjectBuildController\ (\src/tasks/project-build-controller.ts).

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Verification

• TypeScript typecheck (
  pm run check-types): 0 errors.
• Unit test suite (
  pm test): 518 passing (100% pass rate).
• Production build bundle (
  pm run build): Completed cleanly.
• Strict No Emojis rule maintained across all files, comments, and commit messages.