Add EspLog to log through ESP-IDF on ESP32 devices

include/ableton/platforms/Config.hpp

@@ -47,6 +47,7 @@
 #elif defined(ESP_PLATFORM)
 #include <ableton/platforms/esp32/Clock.hpp>
 #include <ableton/platforms/esp32/Context.hpp>
+#include <ableton/platforms/esp32/Log.hpp>
 #include <ableton/platforms/esp32/Random.hpp>
 #include <ableton/platforms/esp32/ScanIpIfAddrs.hpp>
 #endif

include/ableton/platforms/esp32/Log.hpp

@@ -0,0 +1,138 @@
+/* Copyright 2025, All rights reserved.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <esp_log.h>
+#include <sstream>
+#include <string>
+
+namespace ableton
+{
+namespace platforms
+{
+namespace esp32
+{
+
+// ESP-IDF logging implementation for Ableton Link
+struct EspLog
+{
+  enum class Level
+  {
+    Debug,
+    Info,
+    Warning,
+    Error
+  };
+
+  // Tag used for all Link logging
+  //
+  // All Link logging should go through this tag, since ESP-IDF has a lot of
+  // internal logging and this helps to manage being able to filter.
+  //
+  // ESP-IDF has no wildcard filtering support, so for channels we prepend the
+  // channel name to the message text, since channels can be created based on
+  // dynamic data, like IP addresses.
+  static constexpr const char* kTag = "ableton_link";
+
+  EspLog() = default;
+
+  explicit EspLog(std::string context)
+    : mContext(std::move(context))
+  {
+  }
+
+  struct EspLogStream
+  {
+    EspLogStream(Level level, const std::string& context)
+      : mLevel(level)
+      , mContext(context)
+    {
+    }
+
+    EspLogStream(EspLogStream&& rhs)
+      : mLevel(rhs.mLevel)
+      , mContext(rhs.mContext)
+      , mStream(std::move(rhs.mStream))
+    {
+      rhs.mMoved = true;
+    }
+
+    ~EspLogStream()
+    {
+      if (!mMoved)
+      {
+        std::string msg = mStream.str();
+        // Prepend context to message if present
+        if (!mContext.empty())
+        {
+          msg = "[" + mContext + "] " + msg;
+        }
+        switch (mLevel)
+        {
+        case Level::Debug:
+          ESP_LOGD(kTag, "%s", msg.c_str());
+          break;
+        case Level::Info:
+          ESP_LOGI(kTag, "%s", msg.c_str());
+          break;
+        case Level::Warning:
+          ESP_LOGW(kTag, "%s", msg.c_str());
+          break;
+        case Level::Error:
+          ESP_LOGE(kTag, "%s", msg.c_str());
+          break;
+        }
+      }
+    }
+
+    template <typename T>
+    EspLogStream& operator<<(const T& rhs)
+    {
+      mStream << rhs;
+      return *this;
+    }
+
+    Level mLevel;
+    const std::string& mContext;
+    std::ostringstream mStream;
+    bool mMoved = false;
+  };
+
+  friend EspLogStream debug(const EspLog& log) { return {Level::Debug, log.mContext}; }
+
+  friend EspLogStream info(const EspLog& log) { return {Level::Info, log.mContext}; }
+
+  friend EspLogStream warning(const EspLog& log)
+  {
+    return {Level::Warning, log.mContext};
+  }
+
+  friend EspLogStream error(const EspLog& log) { return {Level::Error, log.mContext}; }
+
+  friend EspLog channel(const EspLog& log, const std::string& channelName)
+  {
+    auto newContext =
+      log.mContext.empty() ? channelName : log.mContext + "::" + channelName;
+    return EspLog{std::move(newContext)};
+  }
+
+  std::string mContext;
+};
+
+} // namespace esp32
+} // namespace platforms
+} // namespace ableton