readded set_pattern impl

include/spdlog/logger.h

@@ -290,6 +290,7 @@ public:
     // set formatting for the sinks in this logger.
     // each sink will get a separate instance of the formatter object.
     void set_formatter(std::unique_ptr<formatter> f);
+    void set_pattern(std::string pattern);
 
     // backtrace support.
     // efficiently store all debug/trace messages in a circular buffer until needed for debugging.

include/spdlog/pattern_formatter-inl.h

@@ -12,6 +12,7 @@
 #include <spdlog/details/os.h>
 #include <spdlog/fmt/fmt.h>
 #include <spdlog/formatter.h>
+#include <spdlog/logger.h>
 
 #include <algorithm>
 #include <array>
@@ -1287,4 +1288,14 @@ SPDLOG_INLINE void pattern_formatter::compile_pattern_(const std::string &patter
         formatters_.push_back(std::move(user_chars));
     }
 }
+
+SPDLOG_INLINE void set_pattern(std::string pattern)
+{
+    set_formatter(details::make_unique<pattern_formatter>(std::move(pattern)));
+}
+
+SPDLOG_INLINE void logger::set_pattern(std::string pattern)
+{
+    this->set_formatter(details::make_unique<pattern_formatter>(std::move(pattern)));
+}
 } // namespace spdlog

include/spdlog/spdlog.h

@@ -55,6 +55,9 @@ SPDLOG_API std::shared_ptr<logger> get(const std::string &name);
 // example: spdlog::set_formatter(std::make_unique<spdlog::pattern_formatter>("%Y-%m-%d %H:%M:%S.%e %l : %v"));
 SPDLOG_API void set_formatter(std::unique_ptr<spdlog::formatter> formatter);
 
+// Set global log pattern.
+SPDLOG_API void set_pattern(std::string pattern);
+
 // enable global backtrace support
 SPDLOG_API void enable_backtrace(size_t n_messages);