Add colors to log module (denoland/deno_std#175)

Original: https://github.com/denoland/deno_std/commit/d895c60a51e7cdbf517fee226ffb0274904979f8

1 files changed, 25 insertions, 1 deletions

diff --git a/log/handlers.ts b/log/handlers.ts
index 9241bd77e..5c65c4fd0 100644
--- a/log/handlers.ts
+++ b/log/handlers.ts
@@ -1,7 +1,8 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { open, File, Writer } from "deno";
-import { getLevelByName } from "./levels.ts";
+import { getLevelByName, LogLevel } from "./levels.ts";
 import { LogRecord } from "./logger.ts";
+import { red, yellow, blue, bold } from "../colors/mod.ts";
 
 const DEFAULT_FORMATTER = "{levelName} {msg}";
 type FormatterFunction = (logRecord: LogRecord) => string;
@@ -52,6 +53,29 @@ export class BaseHandler {
 }
 
 export class ConsoleHandler extends BaseHandler {
+  format(logRecord: LogRecord): string {
+    let msg = super.format(logRecord);
+
+    switch (logRecord.level) {
+      case LogLevel.INFO:
+        msg = blue(msg);
+        break;
+      case LogLevel.WARNING:
+        msg = yellow(msg);
+        break;
+      case LogLevel.ERROR:
+        msg = red(msg);
+        break;
+      case LogLevel.CRITICAL:
+        msg = bold(red(msg));
+        break;
+      default:
+        break;
+    }
+
+    return msg;
+  }
+
   log(msg: string) {
     console.log(msg);
   }