From b4c45b564b1e34bb72e1fa900f21f32286047f1a Mon Sep 17 00:00:00 2001
From: Lam Wei Li <peteriman@mail.com>
Date: Wed, 30 Mar 2022 03:53:29 +0800
Subject: [PATCH] chore(fix): fileDepth for ESM

---
 lib/layouts.js | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/lib/layouts.js b/lib/layouts.js
index 7bcf1e7..a762e4d 100644
--- a/lib/layouts.js
+++ b/lib/layouts.js
@@ -2,6 +2,7 @@ const dateFormat = require('date-format');
 const os = require('os');
 const util = require('util');
 const path = require('path');
+const url = require('url');
 const debug = require('debug')('log4js:layouts');
 
 const styles = {
@@ -250,6 +251,35 @@ function patternLayout(pattern, tokens) {
 
   function fileName(loggingEvent, specifier) {
     let filename = loggingEvent.fileName || '';
+
+    // support for ESM as it uses url instead of path for file
+    /* istanbul ignore next: unsure how to simulate ESM for test coverage */
+    const convertFileURLToPath = function(filepath) {
+      const urlPrefix = 'file://';
+      if (filepath.startsWith(urlPrefix)) {
+        // https://nodejs.org/api/url.html#urlfileurltopathurl
+        if (typeof url.fileURLToPath === 'function') {
+          filepath = url.fileURLToPath(filepath);
+        }
+        // backward-compatible for nodejs pre-10.12.0 (without url.fileURLToPath method)
+        else {
+          // posix: file:///hello/world/foo.txt -> /hello/world/foo.txt -> /hello/world/foo.txt
+          // win32: file:///C:/path/foo.txt     -> /C:/path/foo.txt     -> \C:\path\foo.txt     -> C:\path\foo.txt
+          // win32: file://nas/foo.txt          -> //nas/foo.txt        -> nas\foo.txt          -> \\nas\foo.txt
+          filepath = path.normalize(filepath.replace(new RegExp(`^${urlPrefix}`), ''));
+          if (process.platform === 'win32') {
+            if (filepath.startsWith('\\')) {
+              filepath = filepath.slice(1);
+            } else {
+              filepath = path.sep + path.sep + filepath;
+            }
+          }
+        }
+      }
+      return filepath;
+    };
+    filename = convertFileURLToPath(filename);
+
     if (specifier) {
       const fileDepth = parseInt(specifier, 10);
       const fileList = filename.split(path.sep);