# build_handler URL: /api/server/build_handler/ Section: server -------------------------------------------------------------------------------- build_handler - Bengal window.BENGAL_THEME_DEFAULTS = { appearance: 'dark', palette: 'snow-lynx' }; // Progressive Enhancement System Configuration window.Bengal = window.Bengal || {}; window.Bengal.enhanceBaseUrl = '/bengal/assets/js/enhancements'; window.Bengal.watchDom = true; window.Bengal.debug = false; (function () { try { var defaults = window.BENGAL_THEME_DEFAULTS || { appearance: 'system', palette: '' }; var defaultAppearance = defaults.appearance; if (defaultAppearance === 'system') { defaultAppearance = (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) ? 'dark' : 'light'; } var storedTheme = localStorage.getItem('bengal-theme'); var storedPalette = localStorage.getItem('bengal-palette'); var theme = storedTheme ? (storedTheme === 'system' ? defaultAppearance : storedTheme) : defaultAppearance; var palette = storedPalette ?? defaults.palette; document.documentElement.setAttribute('data-theme', theme); if (palette) { document.documentElement.setAttribute('data-palette', palette); } } catch (e) { document.documentElement.setAttribute('data-theme', 'light'); } })(); Skip to main content Magnifying Glass ESC Recent Clear Magnifying Glass No results for "" Try different keywords or check your spelling Start typing to search... ↑↓ Navigate ↵ Open ESC Close Powered by Lunr ᓚᘏᗢ Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Magnifying Glass Search ⌘K Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal List ᓚᘏᗢ Magnifying Glass Search X Close Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal API Reference __main__ bengal Caret Right Folder Analysis community_detection graph_analysis graph_reporting graph_visualizer knowledge_graph link_suggestions link_types page_rank path_analysis performance_advisor results Caret Right Folder Assets manifest pipeline Caret Right Folder Autodoc base config docstring_parser utils virtual_orchestrator Caret Right Folder Extractors cli openapi python Caret Right Folder Models cli common openapi python Caret Right Folder Cache asset_dependency_map cache_store cacheable compression dependency_tracker page_discovery_cache query_index query_index_registry taxonomy_index utils Caret Right Folder Build Cache autodoc_tracking core file_tracking fingerprint parsed_content_cache rendered_output_cache taxonomy_index_mixin validation_cache Caret Right Folder Indexes author_index category_index date_range_index section_index Caret Right Folder Cli __main__ base site_templates utils Caret Right Folder Commands assets build clean collections config debug explain fix health init perf project serve site skeleton sources theme utils validate Caret Right Folder Graph __main__ bridges communities orphans pagerank report suggest Caret Right Folder New config presets scaffolds site wizard Caret Right Folder Helpers cli_app_loader cli_output config_validation error_handling menu_config metadata progress site_loader traceback validation Caret Right Folder Skeleton hydrator schema Caret Right Folder Templates base registry Caret Right Folder Blog template Caret Right Folder Changelog template Caret Right Folder Default template Caret Right Folder Docs template Caret Right Folder Landing template Caret Right Folder Portfolio template Caret Right Folder Resume template Caret Right Folder Collections errors loader schemas validator Caret Right Folder Config defaults deprecation directory_loader env_overrides environment feature_mappings hash loader merge origin_tracker validators Caret Right Folder Content Layer entry loaders manager source Caret Right Folder Sources github local notion rest Caret Right Folder Content Types base registry strategies Caret Right Folder Core build_context cascade_engine menu section theme Caret Right Folder Asset asset_core css_transforms Caret Right Folder Page computed content metadata navigation operations page_core proxy relationships utils Caret Right Folder Site core data discovery factories page_caches properties section_registry theme Caret Right Folder Debug base config_inspector content_migrator delta_analyzer dependency_visualizer explainer incremental_debugger models reporter shortcode_sandbox Caret Right Folder Discovery asset_discovery content_discovery Caret Right Folder Fonts downloader generator Caret Right Folder Health autofix base health_check report Caret Right Folder Linkcheck async_checker ignore_policy internal_checker models orchestrator Caret Right Folder Validators anchors assets cache config connectivity cross_ref fonts links menu navigation output performance rendering rss sitemap taxonomy tracks Caret Right Folder Directives analysis checkers constants Caret Right Folder Orchestration asset content full_to_incremental incremental menu postprocess related_posts render section static streaming taxonomy Caret Right Folder Postprocess html_output redirects rss sitemap special_pages Caret Right Folder Output Formats index_generator json_generator llm_generator lunr_index_generator txt_generator utils Caret Right Folder Rendering api_doc_enhancer asset_extractor errors jinja_utils link_transformer link_validator pygments_cache renderer template_context template_profiler validator Caret Right Folder Parsers base factory mistune native_html pygments_patch python_markdown Caret Right Folder Pipeline core output thread_local toc transforms Caret Right Folder Plugins badges cross_references inline_icon term variable_substitution Caret Right Folder Directives _icons admonitions badge base button cache cards checklist code_tabs container contracts data_table dropdown embed errors example_label fenced figure glossary icon include list_table literalinclude marimo navigation options rubric steps tabs target term terminal tokens utils validator video Caret Right Folder Template Engine asset_url core environment manifest menu url_helpers Caret Right Folder Template Functions advanced_collections advanced_strings autodoc collections content crossref data dates debug files get_page i18n icons images math_functions navigation pagination_helpers seo strings tables taxonomies theme urls Caret Right Folder Server build_handler component_preview constants dev_server live_reload pid_manager reload_controller request_handler request_logger resource_manager utils Caret Right Folder Services validation Caret Right Folder Themes config Caret Right Folder Utils atomic_write autodoc build_context build_stats build_summary cli_output css_minifier dates dotdict error_handlers file_io file_lock hashing incremental_constants js_bundler live_progress logger metadata observability page_initializer pagination path_resolver paths performance_collector performance_report profile progress retry rich_console sections swizzle text theme_registry theme_resolution thread_local traceback_config traceback_renderer url_normalization url_strategy API Reference Server ᗢ Caret Down Link Copy URL External Open LLM text Copy Copy LLM text Share with AI Ask Claude Ask ChatGPT Ask Gemini Ask Copilot Module server.build_handler File system event handler for automatic site rebuilds. Watches for file changes and triggers incremental rebuilds with debouncing. View source 1 Class Classes BuildHandler File system event handler that triggers site rebuild with debouncing. Dev reload policy (source-ga… 10 Caret Right File system event handler that triggers site rebuild with debouncing. Dev reload policy (source-gated): Only source edits (markdown/content, config, templates, theme assets) trigger reloads. CSS-only source edits send reload-css; any other source edits send full reload. We do NOT scan output directories for diffs in dev; this avoids dev-only churn (timestamps, site-wide JSON/TXT) from causing spurious reloads. Features: Debounced rebuilds (0.3s delay to batch changes) Incremental builds for speed (5-10x faster) Parallel rendering Stale object reference prevention (clears ephemeral state) Build error recovery (errors don't crash server) Automatic cache invalidation for config/template changes Handles all file events: create, modify, delete, move/rename Ignored files: Output directory (public/) Bengal state directory (.bengal/) - logs, cache, metrics Temp files (.tmp, ~, .swp, .swo) System files (.DS_Store, .git) Python cache (pycache, .pyc) Inherits from FileSystemEventHandler Methods 4 on_created Handle file creation events. 1 None Caret Right def on_created(self, event: FileSystemEvent) -> None Handle file creation events. Parameters 1 event FileSystemEvent File system event on_modified Handle file modification events. 1 None Caret Right def on_modified(self, event: FileSystemEvent) -> None Handle file modification events. Parameters 1 event FileSystemEvent File system event on_deleted Handle file deletion events. 1 None Caret Right def on_deleted(self, event: FileSystemEvent) -> None Handle file deletion events. Parameters 1 event FileSystemEvent File system event on_moved Handle file move/rename events. 1 None Caret Right def on_moved(self, event: FileSystemEvent) -> None Handle file move/rename events. Parameters 1 event FileSystemEvent File system event with src_path and dest_path Internal Methods 6 Caret Right __init__ Initialize the build handler. 3 None Caret Right def __init__(self, site: Any, host: str = 'localhost', port: int = 5173) -> None Initialize the build handler. Parameters 3 site Any Site instance host str Server host port int Server port _clear_ephemeral_state Clear ephemeral state safely via Site API. 0 None Caret Right def _clear_ephemeral_state(self) -> None Clear ephemeral state safely via Site API. _should_regenerate_autodoc Check if any changed file is in autodoc source directories. 1 bool Caret Right def _should_regenerate_autodoc(self, changed_paths: set[str]) -> bool Check if any changed file is in autodoc source directories. Parameters 1 changed_paths set[str] Set of changed file paths Returns bool — True if any changed file is a Python file in autodoc source directories, or an OpenAPI spec file _should_ignore_file Check if file should be ignored (temp files, swap files, etc). 1 bool Caret Right def _should_ignore_file(self, file_path: str) -> bool Check if file should be ignored (temp files, swap files, etc). Parameters 1 file_path str Path to file Returns bool — True if file should be ignored _trigger_build Execute the actual build (called after debounce delay). This method: 1. Clears… 0 None Caret Right def _trigger_build(self) -> None Execute the actual build (called after debounce delay). This method: Clears ephemeral state to prevent stale object references Runs an incremental + parallel build for speed Displays build statistics Notifies connected SSE clients to reload _handle_file_event Common handler for file system events with debouncing. Multiple rapid file cha… 2 None Caret Right def _handle_file_event(self, event: FileSystemEvent, event_type: str) -> None Common handler for file system events with debouncing. Multiple rapid file changes are batched together and trigger a single rebuild after a short delay (DEBOUNCE_DELAY seconds). Files in the output directory and matching ignore patterns are skipped to prevent infinite rebuild loops. Parameters 2 event FileSystemEvent File system event event_type str Type of event (created, modified, deleted, moved) Next → component_preview List © 2025 Bengal ᓚᘏᗢ window.BENGAL_LAZY_ASSETS = { tabulator: '/bengal/assets/js/tabulator.min.js', dataTable: '/bengal/assets/js/data-table.js', mermaidToolbar: '/bengal/assets/js/mermaid-toolbar.9de5abba.js', mermaidTheme: '/bengal/assets/js/mermaid-theme.344822c5.js', graphMinimap: '/bengal/assets/js/graph-minimap.cc7e42e3.js', graphContextual: '/bengal/assets/js/graph-contextual.440e59c6.js' }; window.BENGAL_ICONS = { close: '/bengal/assets/icons/close.911d4fe1.svg', enlarge: '/bengal/assets/icons/enlarge.652035e5.svg', copy: '/bengal/assets/icons/copy.3d56e945.svg', 'download-svg': '/bengal/assets/icons/download.04f07e1b.svg', 'download-png': '/bengal/assets/icons/image.c34dfd40.svg', 'zoom-in': '/bengal/assets/icons/zoom-in.237b4a83.svg', 'zoom-out': '/bengal/assets/icons/zoom-out.38857c77.svg', reset: '/bengal/assets/icons/reset.d26dba29.svg' }; Arrow Up X -------------------------------------------------------------------------------- Metadata: - Author: lbliii - Word Count: 1517 - Reading Time: 8 minutes