feat(logs): add -DBEAST_ENHANCED_LOGGING with file:line numbers for JLOG macro (#552)

src/ripple/basics/impl/Log.cpp

@@ -17,11 +17,19 @@
 */
 //==============================================================================
 
+#include <date/date.h>
+
 #include <ripple/basics/Log.h>
 #include <ripple/basics/chrono.h>
 #include <ripple/basics/contract.h>
+#ifdef BEAST_ENHANCED_LOGGING
+#include <ripple/beast/utility/EnhancedLogging.h>
+#include <date/tz.h>
+#endif
 #include <boost/algorithm/string.hpp>
 #include <cassert>
+#include <cstring>
+#include <ctime>
 #include <fstream>
 #include <functional>
 #include <iostream>
@@ -316,11 +324,46 @@ Logs::format(
 {
     output.reserve(message.size() + partition.size() + 100);
 
-    output = to_string(std::chrono::system_clock::now());
+#ifdef BEAST_ENHANCED_LOGGING
+    // Environment variables are used instead of config file because:
+    // 1. Logging starts before config parsing (needed to debug config issues)
+    // 2. This is a developer feature - devs can easily set env vars
+    // 3. Allows per-run overrides without editing config files
+    static const char* fmt = []() {
+        const char* env = std::getenv("LOG_DATE_FORMAT");
+        return env ? env : "%Y-%b-%d %T %Z";  // Default format
+    }();
+
+    // Check if we should use local time
+    static const bool useLocalTime = []() {
+        const char* env = std::getenv("LOG_DATE_LOCAL");
+        return env && std::strcmp(env, "1") == 0;
+    }();
+
+    if (useLocalTime)
+    {
+        auto now = std::chrono::system_clock::now();
+        auto local = date::make_zoned(date::current_zone(), now);
+        output = date::format(fmt, local);
+    }
+    else
+    {
+        output = date::format(fmt, std::chrono::system_clock::now());
+    }
+#else
+    output = to_string(std::chrono::system_clock::now());
+#endif
+
+    if (!output.empty())  // Allow setting date format to an empty string
+        output += " ";
 
-    output += " ";
     if (!partition.empty())
+    {
+#ifdef BEAST_ENHANCED_LOGGING
+        output += beast::detail::get_log_highlight_color();
+#endif
         output += partition + ":";
+    }
 
     using namespace beast::severities;
     switch (severity)
@@ -348,6 +391,10 @@ Logs::format(
             break;
     }
 
+#ifdef BEAST_ENHANCED_LOGGING
+    output += "\033[0m";
+#endif
+
     output += message;
 
     // Limit the maximum length of the output