From 09a0b595f26b83477826b1f2e49bdd4d9a4bcee1 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Mon, 18 Aug 2025 19:03:44 +0800
Subject: Add logger cpp stream.

---
 include/cru/base/Base.h       | 10 ++++++++++
 include/cru/base/log/Logger.h | 31 +++++++++++++++++++++++++++++++
 src/base/log/Logger.cpp       | 17 ++++++++++++++++-
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/include/cru/base/Base.h b/include/cru/base/Base.h
index b0d304e4..fd409360 100644
--- a/include/cru/base/Base.h
+++ b/include/cru/base/Base.h
@@ -75,6 +75,16 @@ class CRU_BASE_API Object {
   virtual ~Object() = default;
 };
 
+class CRU_BASE_API Object2 {
+ public:
+  Object2() = default;
+  Object2(const Object2&) = delete;
+  Object2& operator=(const Object2&) = delete;
+  Object2(Object2&&) = delete;
+  Object2& operator=(Object2&&) = delete;
+  virtual ~Object2() = default;
+};
+
 struct CRU_BASE_API Interface {
   Interface() = default;
   CRU_DELETE_COPY(Interface)
diff --git a/include/cru/base/log/Logger.h b/include/cru/base/log/Logger.h
index 498ee1b4..f77296e1 100644
--- a/include/cru/base/log/Logger.h
+++ b/include/cru/base/log/Logger.h
@@ -8,6 +8,7 @@
 #include <memory>
 #include <mutex>
 #include <thread>
+#include <utility>
 #include <vector>
 
 namespace cru::log {
@@ -69,6 +70,36 @@ class CRU_BASE_API Logger : public Object {
 
   std::thread log_thread_;
 };
+
+class CRU_BASE_API LoggerCppStream : public Object2 {
+ public:
+  explicit LoggerCppStream(Logger* logger, LogLevel level, String tag);
+  ~LoggerCppStream() override = default;
+
+  LoggerCppStream WithLevel(LogLevel level) const;
+  LoggerCppStream WithTag(String tag) const;
+
+ private:
+  void Consume(StringView str);
+
+ public:
+  LoggerCppStream& operator<<(StringView str) {
+    this->Consume(str);
+    return *this;
+  }
+
+  template <typename T>
+  LoggerCppStream& operator<<(T&& arg) {
+    this->Consume(ToString(std::forward<T>(arg)));
+    return *this;
+  }
+
+ private:
+  Logger* logger_;
+  LogLevel level_;
+  String tag_;
+};
+
 }  // namespace cru::log
 
 #define CRU_LOG_TAG_DEBUG(...)                                          \
diff --git a/src/base/log/Logger.cpp b/src/base/log/Logger.cpp
index 86c65dbc..8aa8915c 100644
--- a/src/base/log/Logger.cpp
+++ b/src/base/log/Logger.cpp
@@ -1,8 +1,8 @@
 #include "cru/base/log/Logger.h"
 #include "cru/base/log/StdioLogTarget.h"
 
-#include <ctime>
 #include <algorithm>
+#include <ctime>
 
 #ifdef CRU_PLATFORM_WINDOWS
 #include "cru/base/platform/win/DebugLogTarget.h"
@@ -85,4 +85,19 @@ void Logger::Log(LogInfo log_info) {
 #endif
   log_queue_.Push(std::move(log_info));
 }
+
+LoggerCppStream::LoggerCppStream(Logger *logger, LogLevel level, String tag)
+    : logger_(logger), level_(level), tag_(std::move(tag)) {}
+
+LoggerCppStream LoggerCppStream::WithLevel(LogLevel level) const {
+  return LoggerCppStream(this->logger_, level, this->tag_);
+}
+
+LoggerCppStream LoggerCppStream::WithTag(String tag) const {
+  return LoggerCppStream(this->logger_, this->level_, std::move(tag));
+}
+
+void LoggerCppStream::Consume(StringView str) {
+  this->logger_->Log(this->level_, this->tag_, str.ToString());
+}
 }  // namespace cru::log
-- 
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