feat(macos): add Canvas A2UI renderer

vendor/a2ui/specification/0.9/eval/src/logger.ts

@@ -0,0 +1,70 @@
+/*
+ Copyright 2025 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import * as winston from "winston";
+import * as path from "path";
+
+let fileTransport: winston.transport | null = null;
+
+const consoleTransport = new winston.transports.Console({
+  level: "info", // Default to info, can be updated later
+  format: winston.format.combine(
+    winston.format.colorize(),
+    winston.format.printf(({ timestamp, level, message }) => {
+      // Clear the current line (where progress bar might be) before logging
+      // \r clears the line, \x1b[K clears from cursor to end of line
+      return `\r\x1b[K${timestamp} [${level}]: ${message}`;
+    })
+  ),
+});
+
+// Create a default logger instance that logs to console only initially
+export const logger = winston.createLogger({
+  level: "debug", // Allow all logs to flow through (transports can filter)
+  format: winston.format.combine(
+    winston.format.timestamp(),
+    winston.format.printf(({ timestamp, level, message }) => {
+      return `${timestamp} [${level}]: ${message}`;
+    })
+  ),
+  transports: [consoleTransport],
+});
+
+export function setupLogger(outputDir: string | undefined, logLevel: string) {
+  // Ensure the global level allows debug logs so they reach the file transport
+  logger.level = "debug";
+
+  // Update Console transport level to match user preference directly
+  consoleTransport.level = logLevel;
+
+  if (fileTransport) {
+    logger.remove(fileTransport);
+    fileTransport = null;
+  }
+
+  if (outputDir) {
+    fileTransport = new winston.transports.File({
+      filename: path.join(outputDir, "output.log"),
+      level: "debug", // Always capture everything in the file
+      format: winston.format.combine(
+        winston.format.timestamp(),
+        winston.format.json()
+      ),
+    });
+
+    logger.add(fileTransport);
+  }
+}