Add FileLogSink class

Author: albin-johansson

include/tactile/core/log/file_log_sink.hpp

@@ -0,0 +1,27 @@
+// Copyright (C) 2025 Albin Johansson
+// This software is provided under the terms of the MIT License.
+
+#pragma once
+
+#include <fstream>
+
+#include "tactile/core/container/path.hpp"
+#include "tactile/core/log/log_sink.hpp"
+
+namespace tactile {
+
+/// A log sink that forwards messages to a file.
+class FileLogSink final : public ILogSink
+{
+ public:
+  explicit FileLogSink(const Path& path);
+
+  void flush() override;
+
+  void log(const LogEntry& entry) override;
+
+ private:
+  std::ofstream m_file {};
+};
+
+}  // namespace tactile

src/tactile/core/log/file_log_sink.cpp

@@ -0,0 +1,30 @@
+// Copyright (C) 2025 Albin Johansson
+// This software is provided under the terms of the MIT License.
+
+#include "tactile/core/log/file_log_sink.hpp"
+
+#include <ios>
+#include <ostream>
+#include <stdexcept>
+
+namespace tactile {
+
+FileLogSink::FileLogSink(const Path& path)
+  : m_file {path, std::ios::out | std::ios::trunc}
+{
+  if (!m_file.good()) {
+    throw std::runtime_error {"[FileLogSink]: could not create file"};
+  }
+}
+
+void FileLogSink::flush()
+{
+  m_file << std::flush;
+}
+
+void FileLogSink::log(const LogEntry& entry)
+{
+  m_file << entry.prefix << ' ' << entry.message << '\n';
+}
+
+}  // namespace tactile

tools/cmake/targets/tactile_core.cmake

@@ -20,6 +20,7 @@ target_sources(tactile_core
                "${PROJECT_SOURCE_DIR}/include/tactile/core/container/variant.hpp"
                "${PROJECT_SOURCE_DIR}/include/tactile/core/container/vector.hpp"
                "${PROJECT_SOURCE_DIR}/include/tactile/core/log/console_log_sink.hpp"
+               "${PROJECT_SOURCE_DIR}/include/tactile/core/log/file_log_sink.hpp"
                "${PROJECT_SOURCE_DIR}/include/tactile/core/log/log_category.hpp"
                "${PROJECT_SOURCE_DIR}/include/tactile/core/log/log_entry.hpp"
                "${PROJECT_SOURCE_DIR}/include/tactile/core/log/log_sink.hpp"
@@ -36,6 +37,7 @@ target_sources(tactile_core
 
                PRIVATE
                "${PROJECT_SOURCE_DIR}/src/tactile/core/log/console_log_sink.cpp"
+               "${PROJECT_SOURCE_DIR}/src/tactile/core/log/file_log_sink.cpp"
                "${PROJECT_SOURCE_DIR}/src/tactile/core/log/logger.cpp"
                "${PROJECT_SOURCE_DIR}/src/tactile/core/meta/attribute.cpp"
                )