From 64bdda87d3637398f9aa6cd2ffe79d8243998a78 Mon Sep 17 00:00:00 2001
From: Edouard DUPIN <yui.heero@gmail.com>
Date: Wed, 5 Oct 2016 22:53:35 +0200
Subject: [PATCH] [DEV] add a display of the backtrace if user request it

---
 elog/elog.cpp |  7 +++++--
 elog/log.cpp  | 19 ++++++++++++++++---
 elog/log.hpp  |  5 +++++
 3 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/elog/elog.cpp b/elog/elog.cpp
index a2d6662..3de48f1 100644
--- a/elog/elog.cpp
+++ b/elog/elog.cpp
@@ -75,10 +75,12 @@ void elog::init(int _argc, const char** _argv) {
 		if (startWith(data, "--elog-level=")) {
 			ELOG_INFO("Change global level at " << getLogLevel(std::string(data.begin()+13, data.end())));
 			elog::setLevel(getLogLevel(std::string(data.begin()+13, data.end())));
-		} else if (startWith(data, "--elog-color")) {
+		} else if (data == "--elog-color") {
 			elog::setColor(true);
-		} else if (startWith(data, "--elog-no-color")) {
+		} else if (data == "--elog-no-color") {
 			elog::setColor(false);
+		} else if (data == "--elog-back-trace") {
+			elog::setBackTrace(true);
 		} else if (startWith(data, "--elog-file=")) {
 			std::string value(data.begin()+12, data.end());
 			if (value.size() == 0) {
@@ -146,6 +148,7 @@ void elog::init(int _argc, const char** _argv) {
 			ELOG_PRINT("        --elog-file=pathToFile   File to store the logs: (disable console logs)");
 			ELOG_PRINT("        --elog-color             Enable color in log (default in Linux/debug)");
 			ELOG_PRINT("        --elog-no-color          Disable color in log (default in Linux/release and Other)");
+			ELOG_PRINT("        --elog-back-trace        Enable back-trace when an error log level is generated (to get a fast debug)");
 			ELOG_PRINT("        --elog-config=           Configure the Log interface");
 			ELOG_PRINT("            t: diplay time");
 			#ifdef ELOG_BUILD_ETHREAD
diff --git a/elog/log.cpp b/elog/log.cpp
index 367cd3f..eab764c 100644
--- a/elog/log.cpp
+++ b/elog/log.cpp
@@ -36,7 +36,7 @@
 		void * trace[MAX_DEPTH];
 		int stack_depth = backtrace(trace, MAX_DEPTH);
 		
-		ELOG_ERROR("Back-trace : ");
+		ELOG_PRINT("Back-trace : ");
 		for (int32_t i = 1; i < stack_depth; i++) {
 			Dl_info dlinfo;
 			if(!dladdr(trace[i], &dlinfo)) {
@@ -49,8 +49,8 @@
 				symname = demangled;
 			}
 			if (_removeElement <= 0) {
-				ELOG_WARNING("  " << dlinfo.dli_fname << ": ");
-				ELOG_ERROR("        " << symname);
+				ELOG_PRINT("  " << dlinfo.dli_fname << ": ");
+				ELOG_PRINT("        " << symname);
 			}
 			_removeElement--;
 			if(demangled != nullptr) {
@@ -248,6 +248,14 @@ void elog::setLibName(bool _status) {
 	getLibName() = _status;
 }
 
+static bool& getDisplayBackTrace() {
+	static bool g_val = false;
+	return g_val;
+}
+void elog::setBackTrace(bool _status) {
+	getDisplayBackTrace() = _status;
+}
+
 static void getDisplayTime(char* data) {
 #ifdef __TARGET_OS__Android
 	struct timeval  now;
@@ -588,6 +596,11 @@ void elog::logChar(int32_t _id, int32_t _level, int32_t _ligne, const char* _fun
 		std::this_thread::sleep_for(std::chrono::milliseconds(700));
 		displayBacktrace(true, 2);
 	}
+	// Display backtrace to facilitate the error problems
+	if (    _level == level_error
+	     && getDisplayBackTrace() == true) {
+		displayBacktrace(false, 2);
+	}
 }
 
 
diff --git a/elog/log.hpp b/elog/log.hpp
index c255191..319fea2 100644
--- a/elog/log.hpp
+++ b/elog/log.hpp
@@ -102,6 +102,11 @@ namespace elog {
 	 * @param[in] _status New value.
 	 */
 	void setLibName(bool _status);
+	/**
+	 * @brief Set back-trace display on Error log enable or disable.
+	 * @param[in] _status New value.
+	 */
+	void setBackTrace(bool _status);
 	/**
 	 * @brief Call log to display
 	 * @param[in] _id Id of the instance type