#include <iomanip>
#include <iostream>

#include <boost/log/trivial.hpp>
#include <boost/log/utility/setup/console.hpp>

static void color_fmt(boost::log::record_view const& rec, boost::log::formatting_ostream& strm) {
  auto severity = rec[boost::log::trivial::severity];
  bool color = false;
  if (severity) {
    switch (severity.get()) {
      case boost::log::trivial::warning:
        strm << "\033[33m";
        color = true;
        break;
      case boost::log::trivial::error:
      case boost::log::trivial::fatal:
        strm << "\033[31m";
        color = true;
        break;
      default:
        break;
    }
  }
  // setw(7) = the longest log level. eg "warning"
  strm << std::setw(7) << std::setfill(' ') << severity << ": " << rec[boost::log::expressions::smessage];
  if (color) {
    strm << "\033[0m";
  }
}

void logger_init_sink(bool use_colors = false) {
  auto stream = &std::cerr;
  if (getenv("LOG_STDERR") == nullptr) {
    stream = &std::cout;
  }
  auto sink = boost::log::add_console_log(*stream, boost::log::keywords::format = "%Message%",
                                          boost::log::keywords::auto_flush = true);
  if (use_colors) {
    sink->set_formatter(&color_fmt);
  }
}

#include <iomanip>
#include <iostream>

#include <boost/log/trivial.hpp>
#include <boost/log/utility/setup/console.hpp>

static void color_fmt(boost::log::record_view const& rec, boost::log::formatting_ostream& strm) {
  auto severity = rec[boost::log::trivial::severity];
  bool color = false;
  if (severity) {
    switch (severity.get()) {
      case boost::log::trivial::warning:
        strm << "\033[33m";
        color = true;
        break;
      case boost::log::trivial::error:
      case boost::log::trivial::fatal:
        strm << "\033[31m";
        color = true;
        break;
      default:
        break;
    }
  }
  // setw(7) = the longest log level. eg "warning"
  strm << std::setw(7) << std::setfill(' ') << severity << ": " << rec[boost::log::expressions::smessage];
  if (color) {
    strm << "\033[0m";
  }
}

void logger_init_sink(bool use_colors = false) {
  auto sink = boost::log::add_console_log(std::cout, boost::log::keywords::format = "%Message%",
                                          boost::log::keywords::auto_flush = true);
  if (use_colors) {
    sink->set_formatter(&color_fmt);
  }
}

--- 
+++ 
@@ -30,7 +30,11 @@
 }
 
 void logger_init_sink(bool use_colors = false) {
-  auto sink = boost::log::add_console_log(std::cout, boost::log::keywords::format = "%Message%",
+  auto stream = &std::cerr;
+  if (getenv("LOG_STDERR") == nullptr) {
+    stream = &std::cout;
+  }
+  auto sink = boost::log::add_console_log(*stream, boost::log::keywords::format = "%Message%",
                                           boost::log::keywords::auto_flush = true);
   if (use_colors) {
     sink->set_formatter(&color_fmt);
logging: Allow logger to use STDERR

This allows libaktualizr to log to STDERR if LOG_STDERR is defined
in the environment. A handy way this can be used is for something
like aktualizr-get:

 LOG_STDERR=1 aktualizr-get ....

This allows you to understand what is logging (stderr's fd) and what
is the output (stdout's fd).

Signed-off-by: Andy Doan <e3579b1e47f273529f0f929453e939a68ede9fd1@foundries.io>
