Add Python macro worker runtime, ScriptEngine resolution, and PageRenderer/registry integration

Co-authored-by: rfc1437 <774975+rfc1437@users.noreply.github.com>

src/main/engine/PageRenderer.ts

@@ -11,6 +11,25 @@ import { CALENDAR_RUNTIME_JS } from './assets/calendarRuntime';
 import { TAG_CLOUD_RUNTIME_JS } from './assets/tagCloudRuntime';
 import { resolveRenderLanguageFromProjectPreferences, translateRender } from '../shared/i18n';
 
+export interface PythonMacroScript {
+  id: string;
+  slug: string;
+  entrypoint: string;
+  content: string;
+  version: number;
+}
+
+export interface PythonMacroRendererContract {
+  getEnabledMacroScripts(): Promise<PythonMacroScript[]>;
+  renderMacro(params: {
+    scriptContent: string;
+    entrypoint: string;
+    contextJson: string;
+    cacheKey?: string;
+    timeoutMs?: number;
+  }): Promise<{ html: string; data?: Record<string, unknown>; warnings?: string[] }>;
+}
+
 export interface HtmlRewriteContext {
   canonicalPostPathBySlug: Map<string, string>;
   canonicalMediaPathBySourcePath: Map<string, string>;
@@ -801,6 +820,107 @@ export function renderMacro(
   return '';
 }
 
+const JS_BUILTIN_MACROS = new Set(['youtube', 'vimeo', 'gallery', 'photo_archive', 'photo_album', 'tag_cloud']);
+
+export function isBuiltInMacro(name: string): boolean {
+  return JS_BUILTIN_MACROS.has(normalizeMacroName(name));
+}
+
+export async function replaceAllMacrosAsync(
+  content: string,
+  postId: string,
+  mediaItems: MediaData[],
+  linkedMediaIds: Set<string> | null,
+  tagUsage: TagUsageEntry[],
+  renderLanguage: string,
+  pythonMacroRenderer?: PythonMacroRendererContract | null,
+): Promise<string> {
+  const macroRegex = /\[\[(\w+)(?:\s+([^\]]+))?\]\]/g;
+  const matches: Array<{ fullMatch: string; name: string; rawParams: string | undefined; start: number; end: number }> = [];
+
+  let match: RegExpExecArray | null = null;
+  while ((match = macroRegex.exec(content)) !== null) {
+    matches.push({
+      fullMatch: match[0],
+      name: match[1].toLowerCase(),
+      rawParams: match[2],
+      start: match.index,
+      end: match.index + match[0].length,
+    });
+  }
+
+  if (matches.length === 0) {
+    return content;
+  }
+
+  let pythonScripts: PythonMacroScript[] | null = null;
+  const hasUnknownMacros = matches.some((m) => !isBuiltInMacro(m.name));
+
+  if (hasUnknownMacros && pythonMacroRenderer) {
+    try {
+      pythonScripts = await pythonMacroRenderer.getEnabledMacroScripts();
+    } catch {
+      pythonScripts = [];
+    }
+  }
+
+  const scriptsBySlug = new Map<string, PythonMacroScript>();
+  if (pythonScripts) {
+    for (const script of pythonScripts) {
+      scriptsBySlug.set(script.slug.toLowerCase(), script);
+    }
+  }
+
+  const rendered: string[] = [];
+
+  for (const m of matches) {
+    const params = parseMacroParams(m.rawParams);
+    const builtInResult = renderMacro(m.name, params, postId, mediaItems, linkedMediaIds, tagUsage, renderLanguage);
+
+    if (builtInResult || isBuiltInMacro(m.name)) {
+      rendered.push(builtInResult);
+      continue;
+    }
+
+    const pythonScript = scriptsBySlug.get(normalizeMacroName(m.name));
+    if (pythonScript && pythonMacroRenderer) {
+      try {
+        const context = {
+          env: {
+            isPreview: false,
+            mainLanguage: renderLanguage,
+            hook: m.name,
+            source: { kind: 'macro', id: pythonScript.id },
+          },
+          params: params as Record<string, unknown>,
+        };
+
+        const result = await pythonMacroRenderer.renderMacro({
+          scriptContent: pythonScript.content,
+          entrypoint: pythonScript.entrypoint,
+          contextJson: JSON.stringify(context),
+          cacheKey: `${pythonScript.id}:${pythonScript.version}`,
+          timeoutMs: 10000,
+        });
+
+        rendered.push(result.html);
+      } catch {
+        rendered.push('');
+      }
+    } else {
+      rendered.push('');
+    }
+  }
+
+  let result = content;
+  for (let i = matches.length - 1; i >= 0; i--) {
+    const m = matches[i];
+    result = result.slice(0, m.start) + rendered[i] + result.slice(m.end);
+  }
+
+  return result;
+}
+
 export function buildCanonicalPostPath(post: PostData): string {
   const year = post.createdAt.getFullYear();
   const month = String(post.createdAt.getMonth() + 1).padStart(2, '0');
@@ -898,12 +1018,19 @@ export class PageRenderer {
   private readonly mediaEngine: MediaEngineContract;
   private readonly postMediaEngine: PostMediaEngineContract;
   private readonly postEngineForMacros?: PostEngineContract;
+  private readonly pythonMacroRenderer?: PythonMacroRendererContract;
   private readonly liquid: Liquid;
 
-  constructor(mediaEngine: MediaEngineContract, postMediaEngine: PostMediaEngineContract, postEngineForMacros?: PostEngineContract) {
+  constructor(
+    mediaEngine: MediaEngineContract,
+    postMediaEngine: PostMediaEngineContract,
+    postEngineForMacros?: PostEngineContract,
+    pythonMacroRenderer?: PythonMacroRendererContract,
+  ) {
     this.mediaEngine = mediaEngine;
     this.postMediaEngine = postMediaEngine;
     this.postEngineForMacros = postEngineForMacros;
+    this.pythonMacroRenderer = pythonMacroRenderer;
 
     const templateRoots = resolvePageRendererTemplateRoots();
 
@@ -951,10 +1078,9 @@ export class PageRenderer {
           .catch(() => null)
         : null;
 
-      const withMacros = content.replace(/\[\[(\w+)(?:\s+([^\]]+))?\]\]/g, (_match, macroName: string, rawParams: string | undefined) => {
-        const params = parseMacroParams(rawParams);
-        return renderMacro(macroName.toLowerCase(), params, postId, mediaItems, linkedMediaIds, tagUsage, renderLanguage);
-      });
+      const withMacros = await replaceAllMacrosAsync(
+        content, postId, mediaItems, linkedMediaIds, tagUsage, renderLanguage, this.pythonMacroRenderer,
+      );
 
       const markdownHtml = await marked.parse(withMacros, { async: true, gfm: true, breaks: false });
       const annotatedMarkdownHtml = annotateCodeBlocksWithLanguage(markdownHtml);

src/main/engine/PreviewServer.ts

@@ -19,7 +19,10 @@ import {
   type HtmlRewriteContext,
   type MediaEngineContract,
   type PostMediaEngineContract,
+  type PythonMacroRendererContract,
 } from './PageRenderer';
+import { getScriptEngine } from './ScriptEngine';
+import { getPythonMacroWorkerRuntime } from './PythonMacroWorkerRuntime';
 import { getPicoStylesheetHref, sanitizePicoTheme, sanitizePicoThemeMode } from '../shared/picoThemes';
 import { renderRouteWithSharedContext } from './SharedRouteRenderer';
 import {
@@ -103,7 +106,7 @@ export class PreviewServer {
         projectDescription: activeProject?.description ?? undefined,
       };
     });
-    this.pageRenderer = new PageRenderer(this.mediaEngine, this.postMediaEngine, this.postEngine);
+    this.pageRenderer = new PageRenderer(this.mediaEngine, this.postMediaEngine, this.postEngine, buildPythonMacroRenderer());
   }
 
   async start(preferredPort = 0): Promise<number> {
@@ -614,3 +617,21 @@ export class PreviewServer {
     res.end(body);
   }
 }
+
+function buildPythonMacroRenderer(): PythonMacroRendererContract {
+  return {
+    async getEnabledMacroScripts() {
+      const scripts = await getScriptEngine().getEnabledMacroScripts();
+      return scripts.map((s) => ({
+        id: s.id,
+        slug: s.slug,
+        entrypoint: s.entrypoint,
+        content: s.content,
+        version: s.version,
+      }));
+    },
+    async renderMacro(params) {
+      return getPythonMacroWorkerRuntime().renderMacro(params);
+    },
+  };
+}

src/main/engine/PythonMacroWorkerRuntime.ts

@@ -0,0 +1,301 @@
+import * as path from 'path';
+import { Worker } from 'worker_threads';
+
+interface WorkerRenderMacroRequest {
+  type: 'renderMacro';
+  requestId: string;
+  scriptContent: string;
+  entrypoint: string;
+  contextJson: string;
+  cacheKey?: string;
+}
+
+interface WorkerReadyMessage {
+  type: 'ready';
+}
+
+interface WorkerMacroResultMessage {
+  type: 'macroResult';
+  requestId: string;
+  html: string;
+  data?: Record<string, unknown>;
+  warnings?: string[];
+}
+
+interface WorkerMacroErrorMessage {
+  type: 'macroError';
+  requestId: string;
+  error: string;
+}
+
+interface WorkerFatalErrorMessage {
+  type: 'error';
+  error: string;
+}
+
+type WorkerResponseMessage = WorkerReadyMessage | WorkerMacroResultMessage | WorkerMacroErrorMessage | WorkerFatalErrorMessage;
+
+export interface MacroRenderParams {
+  scriptContent: string;
+  entrypoint: string;
+  contextJson: string;
+  timeoutMs?: number;
+  cacheKey?: string;
+}
+
+export interface MacroRenderResult {
+  html: string;
+  data?: Record<string, unknown>;
+  warnings?: string[];
+}
+
+interface QueuedRequest {
+  request: WorkerRenderMacroRequest;
+  timeoutMs: number;
+  resolve: (value: MacroRenderResult) => void;
+  reject: (error: Error) => void;
+}
+
+interface ActiveRequest extends QueuedRequest {
+  timeoutId: ReturnType<typeof setTimeout> | null;
+}
+
+export class PythonMacroWorkerRuntime {
+  private worker: Worker | null = null;
+  private workerReady = false;
+  private workerStartPromise: Promise<void> | null = null;
+  private workerStartResolve: (() => void) | null = null;
+  private workerStartReject: ((error: Error) => void) | null = null;
+  private activeRequest: ActiveRequest | null = null;
+  private queue: QueuedRequest[] = [];
+  private requestCounter = 0;
+  private _macroCount = 0;
+  private _errorCount = 0;
+  private _timeoutCount = 0;
+
+  async renderMacro(params: MacroRenderParams): Promise<MacroRenderResult> {
+    const requestId = this.nextRequestId();
+    const timeoutMs = params.timeoutMs ?? 5000;
+
+    return new Promise<MacroRenderResult>((resolve, reject) => {
+      this.queue.push({
+        request: {
+          type: 'renderMacro',
+          requestId,
+          scriptContent: params.scriptContent,
+          entrypoint: params.entrypoint,
+          contextJson: params.contextJson,
+          cacheKey: params.cacheKey,
+        },
+        timeoutMs,
+        resolve,
+        reject,
+      });
+
+      this.dispatchNext().catch((error) => {
+        reject(error instanceof Error ? error : new Error(String(error)));
+      });
+    });
+  }
+
+  get macroCount(): number {
+    return this._macroCount;
+  }
+
+  get errorCount(): number {
+    return this._errorCount;
+  }
+
+  get timeoutCount(): number {
+    return this._timeoutCount;
+  }
+
+  resetCounters(): void {
+    this._macroCount = 0;
+    this._errorCount = 0;
+    this._timeoutCount = 0;
+  }
+
+  dispose(): void {
+    this.rejectStartPromise(new Error('Python macro worker runtime disposed'));
+    this.rejectActiveAndQueue(new Error('Python macro worker runtime disposed'));
+    this.resetWorker();
+  }
+
+  private async dispatchNext(): Promise<void> {
+    if (this.activeRequest || this.queue.length === 0) {
+      return;
+    }
+
+    await this.ensureWorkerStarted();
+
+    const nextRequest = this.queue.shift();
+    if (!nextRequest) {
+      return;
+    }
+
+    const timeoutId = setTimeout(() => {
+      if (!this.activeRequest || this.activeRequest.request.requestId !== nextRequest.request.requestId) {
+        return;
+      }
+
+      this._timeoutCount += 1;
+      const timeoutError = new Error(`Python macro timed out after ${nextRequest.timeoutMs}ms`);
+      this.activeRequest.reject(timeoutError);
+      this.activeRequest = null;
+      this.resetWorker();
+      void this.dispatchNext();
+    }, nextRequest.timeoutMs);
+
+    this.activeRequest = {
+      ...nextRequest,
+      timeoutId,
+    };
+
+    this.worker?.postMessage(nextRequest.request);
+  }
+
+  private async ensureWorkerStarted(): Promise<void> {
+    if (this.worker && this.workerReady) {
+      return;
+    }
+
+    if (this.workerStartPromise) {
+      return this.workerStartPromise;
+    }
+
+    const workerPath = path.join(__dirname, 'pythonMacro.worker.js');
+    this.worker = new Worker(workerPath);
+    this.workerReady = false;
+
+    this.worker.on('message', (message: WorkerResponseMessage) => {
+      this.handleWorkerMessage(message);
+    });
+
+    this.worker.on('error', (error) => {
+      this.handleWorkerCrash(error instanceof Error ? error : new Error(String(error)));
+    });
+
+    this.worker.on('exit', (code) => {
+      if (code !== 0) {
+        this.handleWorkerCrash(new Error(`Python macro worker exited with code ${code}`));
+      }
+    });
+
+    this.workerStartPromise = new Promise<void>((resolve, reject) => {
+      this.workerStartResolve = resolve;
+      this.workerStartReject = reject;
+    });
+
+    return this.workerStartPromise;
+  }
+
+  private handleWorkerMessage(message: WorkerResponseMessage): void {
+    if (message.type === 'ready') {
+      this.workerReady = true;
+      this.resolveStartPromise();
+      return;
+    }
+
+    if (message.type === 'error') {
+      this.handleWorkerCrash(new Error(message.error));
+      return;
+    }
+
+    const active = this.activeRequest;
+    if (!active) {
+      return;
+    }
+
+    if (active.request.requestId !== message.requestId) {
+      return;
+    }
+
+    if (active.timeoutId) {
+      clearTimeout(active.timeoutId);
+    }
+
+    this.activeRequest = null;
+    this._macroCount += 1;
+
+    if (message.type === 'macroResult') {
+      active.resolve({
+        html: message.html,
+        data: message.data,
+        warnings: message.warnings,
+      });
+    } else {
+      this._errorCount += 1;
+      active.reject(new Error(message.error));
+    }
+
+    void this.dispatchNext();
+  }
+
+  private handleWorkerCrash(error: Error): void {
+    this.rejectStartPromise(error);
+    this.rejectActiveAndQueue(error);
+    this.resetWorker();
+  }
+
+  private rejectActiveAndQueue(error: Error): void {
+    if (this.activeRequest) {
+      if (this.activeRequest.timeoutId) {
+        clearTimeout(this.activeRequest.timeoutId);
+      }
+      this.activeRequest.reject(error);
+      this.activeRequest = null;
+    }
+
+    while (this.queue.length > 0) {
+      const queued = this.queue.shift();
+      queued?.reject(error);
+    }
+  }
+
+  private resolveStartPromise(): void {
+    if (this.workerStartResolve) {
+      this.workerStartResolve();
+    }
+    this.workerStartResolve = null;
+    this.workerStartReject = null;
+    this.workerStartPromise = null;
+  }
+
+  private rejectStartPromise(error: Error): void {
+    if (this.workerStartReject) {
+      this.workerStartReject(error);
+    }
+    this.workerStartResolve = null;
+    this.workerStartReject = null;
+    this.workerStartPromise = null;
+  }
+
+  private resetWorker(): void {
+    if (this.worker) {
+      this.worker.removeAllListeners();
+      this.worker.terminate();
+    }
+
+    this.worker = null;
+    this.workerReady = false;
+    this.workerStartPromise = null;
+    this.workerStartResolve = null;
+    this.workerStartReject = null;
+  }
+
+  private nextRequestId(): string {
+    this.requestCounter += 1;
+    return `py-macro-${this.requestCounter}`;
+  }
+}
+
+let pythonMacroWorkerRuntimeInstance: PythonMacroWorkerRuntime | null = null;
+
+export function getPythonMacroWorkerRuntime(): PythonMacroWorkerRuntime {
+  if (!pythonMacroWorkerRuntimeInstance) {
+    pythonMacroWorkerRuntimeInstance = new PythonMacroWorkerRuntime();
+  }
+
+  return pythonMacroWorkerRuntimeInstance;
+}

src/main/engine/ScriptEngine.ts

@@ -222,6 +222,24 @@ export class ScriptEngine extends EventEmitter {
     return Promise.all(rows.map((item) => this.toScriptData(item)));
   }
 
+  async getEnabledMacroScripts(): Promise<ScriptData[]> {
+    const rows = await this.getAllScriptRows();
+    const macroRows = rows.filter((row) => row.kind === 'macro' && row.enabled);
+    return Promise.all(macroRows.map((item) => this.toScriptData(item)));
+  }
+
+  async getMacroScriptBySlug(slug: string): Promise<ScriptData | null> {
+    const normalizedSlug = slug.toLowerCase();
+    const rows = await this.getAllScriptRows();
+    const match = rows.find(
+      (row) => row.kind === 'macro' && row.enabled && row.slug.toLowerCase() === normalizedSlug,
+    );
+    if (!match) {
+      return null;
+    }
+    return this.toScriptData(match);
+  }
+
   async rebuildDatabaseFromFiles(): Promise<void> {
     const db = getDatabase().getLocal();
     const scriptsDir = this.getScriptsDir();

src/main/engine/pythonMacro.worker.ts

@@ -0,0 +1,124 @@
+import { parentPort } from 'worker_threads';
+
+interface WorkerRenderMacroRequest {
+  type: 'renderMacro';
+  requestId: string;
+  scriptContent: string;
+  entrypoint: string;
+  contextJson: string;
+  cacheKey?: string;
+}
+
+interface WorkerReadyMessage {
+  type: 'ready';
+}
+
+interface WorkerMacroResultMessage {
+  type: 'macroResult';
+  requestId: string;
+  html: string;
+  data?: Record<string, unknown>;
+  warnings?: string[];
+}
+
+interface WorkerMacroErrorMessage {
+  type: 'macroError';
+  requestId: string;
+  error: string;
+}
+
+interface WorkerFatalErrorMessage {
+  type: 'error';
+  error: string;
+}
+
+type WorkerResponseMessage = WorkerReadyMessage | WorkerMacroResultMessage | WorkerMacroErrorMessage | WorkerFatalErrorMessage;
+
+type PyodideRuntime = {
+  globals: {
+    set: (name: string, value: unknown) => void;
+  } | any;
+  runPythonAsync: (code: string) => Promise<unknown>;
+};
+
+let runtimePromise: Promise<PyodideRuntime> | null = null;
+let lastCacheKey: string | null = null;
+
+function postMessage(message: WorkerResponseMessage): void {
+  parentPort?.postMessage(message);
+}
+
+async function getRuntime(): Promise<PyodideRuntime> {
+  if (!runtimePromise) {
+    runtimePromise = (async () => {
+      const pyodideModule = await import('pyodide');
+      return (await pyodideModule.loadPyodide()) as unknown as PyodideRuntime;
+    })();
+  }
+
+  return runtimePromise;
+}
+
+async function renderMacro(request: WorkerRenderMacroRequest): Promise<void> {
+  try {
+    const runtime = await getRuntime();
+
+    const shouldReloadScript = !request.cacheKey || request.cacheKey !== lastCacheKey;
+
+    if (shouldReloadScript) {
+      await runtime.runPythonAsync(request.scriptContent);
+      lastCacheKey = request.cacheKey ?? null;
+    }
+
+    runtime.globals.set('__bds_macro_context_json', request.contextJson);
+    runtime.globals.set('__bds_macro_entrypoint', request.entrypoint);
+
+    const rawResult = await runtime.runPythonAsync(`
+import json as _json
+
+_macro_ctx = _json.loads(__bds_macro_context_json)
+_macro_ep = __bds_macro_entrypoint
+_macro_fn = globals().get(_macro_ep)
+if _macro_fn is None or not callable(_macro_fn):
+    raise RuntimeError(f"Macro entrypoint '{_macro_ep}' is not callable")
+_macro_result = _macro_fn(_macro_ctx)
+if _macro_result is None:
+    raise RuntimeError("Macro function returned None")
+if not isinstance(_macro_result, dict):
+    raise RuntimeError("Macro function must return a dict with at least an 'html' key")
+if "html" not in _macro_result:
+    raise RuntimeError("Macro result must contain an 'html' key")
+_json.dumps(_macro_result)
+`);
+
+    const parsed = JSON.parse(String(rawResult));
+
+    postMessage({
+      type: 'macroResult',
+      requestId: request.requestId,
+      html: typeof parsed.html === 'string' ? parsed.html : '',
+      data: parsed.data,
+      warnings: Array.isArray(parsed.warnings) ? parsed.warnings : undefined,
+    });
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    postMessage({ type: 'macroError', requestId: request.requestId, error: message });
+  }
+}
+
+parentPort?.on('message', (message: WorkerRenderMacroRequest) => {
+  if (message.type !== 'renderMacro') {
+    return;
+  }
+
+  void renderMacro(message);
+});
+
+void getRuntime()
+  .then(() => {
+    postMessage({ type: 'ready' });
+  })
+  .catch((error) => {
+    const message = error instanceof Error ? error.message : String(error);
+    postMessage({ type: 'error', error: message });
+  });

src/renderer/macros/index.ts

@@ -24,6 +24,9 @@ export type {
   MacroParams,
   MacroRenderContext,
   ParsedMacro,
+  PythonMacroInfo,
+  PythonMacroResolver,
+  PythonMacroRendererFn,
 } from './types';
 
 // Re-export registry functions
@@ -39,4 +42,5 @@ export {
   renderMacro,
   renderAllMacros,
   getEditorPreview,
+  setPythonMacroResolver,
 } from './registry';

src/renderer/macros/registry.ts

@@ -5,11 +5,22 @@
  * Macros self-register using registerMacro() function.
  */
 
-import type { MacroDefinition, MacroParams, MacroRenderContext, ParsedMacro } from './types';
+import type {
+  MacroDefinition,
+  MacroParams,
+  MacroRenderContext,
+  ParsedMacro,
+  PythonMacroResolver,
+  PythonMacroRendererFn,
+} from './types';
 
 // Internal registry storage
 const macroRegistry = new Map<string, MacroDefinition>();
 
+// Python macro resolution
+let pythonMacroResolverFn: PythonMacroResolver | null = null;
+let pythonMacroRendererFn: PythonMacroRendererFn | null = null;
+
 /**
  * Register a macro definition.
  * Call this from each macro definition file.
@@ -25,6 +36,18 @@ export function registerMacro(macro: MacroDefinition): void {
   macroRegistry.set(name, macro);
 }
 
+/**
+ * Set the Python macro resolver and renderer for preview rendering.
+ * When a macro is not found in the JS registry, the resolver will be called.
+ */
+export function setPythonMacroResolver(
+  resolver: PythonMacroResolver | null,
+  renderer: PythonMacroRendererFn | null,
+): void {
+  pythonMacroResolverFn = resolver;
+  pythonMacroRendererFn = renderer;
+}
+
 /**
  * Get a macro definition by name.
  * 
@@ -124,6 +147,7 @@ export function parseMacros(markdown: string): ParsedMacro[] {
 
 /**
  * Render a single macro to HTML.
+ * First checks JS registry, then falls back to Python macro resolver.
  * 
  * @param macro - The parsed macro
  * @param context - Render context
@@ -135,25 +159,36 @@ export async function renderMacro(
 ): Promise<string> {
   const definition = getMacro(macro.name);
   
-  if (!definition) {
-    return `<span class="macro-error" title="Unknown macro: ${macro.name}">${macro.rawText}</span>`;
-  }
+  if (definition) {
+    // Validate if validator exists
+    if (definition.validate) {
+      const error = definition.validate(macro.params);
+      if (error) {
+        return `<span class="macro-error" title="${error}">${macro.rawText}</span>`;
+      }
+    }
     
-  // Validate if validator exists
-  if (definition.validate) {
-    const error = definition.validate(macro.params);
-    if (error) {
-      return `<span class="macro-error" title="${error}">${macro.rawText}</span>`;
+    try {
+      const result = definition.render(macro.params, context);
+      return result instanceof Promise ? await result : result;
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Render error';
+      return `<span class="macro-error" title="${message}">${macro.rawText}</span>`;
     }
   }
 
-  try {
-    const result = definition.render(macro.params, context);
-    return result instanceof Promise ? await result : result;
-  } catch (error) {
-    const message = error instanceof Error ? error.message : 'Render error';
-    return `<span class="macro-error" title="${message}">${macro.rawText}</span>`;
+  if (pythonMacroResolverFn && pythonMacroRendererFn) {
+    try {
+      const pythonInfo = await pythonMacroResolverFn(macro.name);
+      if (pythonInfo) {
+        return await pythonMacroRendererFn(pythonInfo, macro.params, context);
+      }
+    } catch {
+      return `<span class="macro-error" title="Python macro error">${macro.rawText}</span>`;
+    }
   }
+
+  return `<span class="macro-error" title="Unknown macro: ${macro.name}">${macro.rawText}</span>`;
 }
 
 /**

src/renderer/macros/types.ts

@@ -75,3 +75,30 @@ export interface ParsedMacro {
   /** End position in the source text */
   end: number;
 }
+
+/**
+ * Resolved Python macro script information for rendering.
+ */
+export interface PythonMacroInfo {
+  scriptId: string;
+  slug: string;
+  code: string;
+  entrypoint: string;
+  version: number;
+}
+
+/**
+ * Resolver function that checks if a macro name maps to a Python script.
+ * Returns script info if found, null otherwise.
+ */
+export type PythonMacroResolver = (macroName: string) => Promise<PythonMacroInfo | null>;
+
+/**
+ * Renderer function that executes a Python macro with the given context.
+ * Returns the rendered HTML string.
+ */
+export type PythonMacroRendererFn = (
+  info: PythonMacroInfo,
+  params: MacroParams,
+  context: MacroRenderContext,
+) => Promise<string>;