PICout improvement:

* renamed private members for more clear code
 * registerExternalBufferID() method to obtain unique ID for withExternalBuffer()
 * PICoutManipulators::PICoutStdStream enum for select stream (stdout or stderr)
 * Constructors now accept optional stream
 * piCerr and piCerrObj macros

PIDir::temporary() moved to "mkdtemp"

PILog:
 * now 4 levels
 * you can set max level
 * Error writes to piCerr

libs/main/application/pilog.cpp

@@ -76,6 +76,10 @@ PILog::PILog(): PIThread(), log_ts(&log_file) {
 	split_time       = 8_h;
 	timestamp_format = "yyyy-MM-dd hh:mm:ss.zzz";
 	setLineFormat("t - c: m");
+	id_by_cat[Level::Info]    = PICout::registerExternalBufferID();
+	id_by_cat[Level::Debug]   = PICout::registerExternalBufferID();
+	id_by_cat[Level::Warning] = PICout::registerExternalBufferID();
+	id_by_cat[Level::Error]   = PICout::registerExternalBufferID();
 	CONNECTU(PICout::Notifier::object(), finished, this, coutDone);
 }
 
@@ -101,18 +105,28 @@ void PILog::setLineFormat(const PIString & f) {
 }
 
 
-PICout PILog::debug(PIObject * context) {
-	return makePICout(context, Category::Debug);
-}
-
-
-PICout PILog::warning(PIObject * context) {
-	return makePICout(context, Category::Warning);
+void PILog::setLevel(Level l) {
+	max_level = l;
 }
 
 
 PICout PILog::error(PIObject * context) {
-	return makePICout(context, Category::Error);
+	return makePICout(context, Level::Error);
+}
+
+
+PICout PILog::warning(PIObject * context) {
+	return makePICout(context, Level::Warning);
+}
+
+
+PICout PILog::info(PIObject * context) {
+	return makePICout(context, Level::Info);
+}
+
+
+PICout PILog::debug(PIObject * context) {
+	return makePICout(context, Level::Debug);
 }
 
 
@@ -129,35 +143,27 @@ void PILog::stop() {
 
 
 void PILog::coutDone(int id, PIString * buffer) {
-	cout_mutex.lock();
-	if (!cout_cat_by_id.contains(id)) {
-		cout_mutex.unlock();
-		return;
-	}
-	auto cat = cout_cat_by_id.take(id, PILog::Category::Debug);
-	cout_mutex.unlock();
 	if (!buffer) return;
+	if (!id_by_cat.containsValue(id)) return;
+	auto cat = id_by_cat.key(id, PILog::Level::Debug);
+	if (cat > max_level) return;
 	enqueue(*buffer, cat);
 	delete buffer;
 }
 
 
-PICout PILog::makePICout(PIObject * context, Category cat) {
-	cout_mutex.lock();
-	int id             = ++cout_id;
-	auto buffer        = new PIString();
-	cout_cat_by_id[id] = cat;
-	cout_mutex.unlock();
+PICout PILog::makePICout(PIObject * context, Level cat) {
+	auto buffer = new PIString();
 	if (context) {
 		*buffer = "["_a + context->className();
 		if (context->name().isNotEmpty()) *buffer += " \"" + context->name() + "\"";
 		*buffer += "] ";
 	}
-	return PICout::withExternalBuffer(buffer, id, PICoutManipulators::AddSpaces);
+	return PICout::withExternalBuffer(buffer, id_by_cat.value(cat), PICoutManipulators::AddSpaces);
 }
 
 
-void PILog::enqueue(const PIString & msg, Category cat) {
+void PILog::enqueue(const PIString & msg, Level cat) {
 	if (log_file.isClosed()) return;
 	auto t = PIDateTime::fromSystemTime(PISystemTime::current());
 	PIMutexLocker ml(log_mutex);
@@ -166,7 +172,7 @@ void PILog::enqueue(const PIString & msg, Category cat) {
 
 
 PIString PILog::entryToString(const Entry & e) const {
-	static PIStringList categories{"debug", "warn ", "error"};
+	static PIStringList categories{"error", "warn ", "info ", "debug"};
 	PIString t   = e.time.toString(timestamp_format);
 	PIString ret = line_format_p;
 	ret.replace("${t}", t).replace("${c}", categories[static_cast<int>(e.cat)]).replace("${m}", e.msg);
@@ -175,7 +181,7 @@ PIString PILog::entryToString(const Entry & e) const {
 
 
 void PILog::newFile() {
-	PIString aname = app_name;
+	PIString aname = log_name;
 	if (aname.isNotEmpty()) aname += "__";
 	log_file.open(log_dir + "/" + aname + PIDateTime::current().toString("yyyy_MM_dd__hh_mm_ss") + ".log." +
 					  PIString::fromNumber(++part_number),
@@ -205,6 +211,9 @@ void PILog::run() {
 		log_mutex.unlock();
 		auto str = entryToString(qi);
 		log_ts << str << "\n";
-		piCout << str;
+		if (qi.cat == Level::Error)
+			piCerr << str;
+		else
+			piCout << str;
 	}
 }