Remove automatic backtrace display on failure

To display backtrace on failure one must now invoke pugs with the
--backtrace (or -b)  option

src/utils/BacktraceManager.cpp

@@ -8,6 +8,14 @@
 #include <rang.hpp>
 #include <regex>
 
+bool BacktraceManager::s_show = false;
+
+void
+BacktraceManager::setShow(bool show_backtrace)
+{
+  s_show = show_backtrace;
+}
+
 BacktraceManager::BacktraceManager()
 {
   const int size = 100;
@@ -26,6 +34,7 @@ BacktraceManager::BacktraceManager()
 std::ostream&
 operator<<(std::ostream& os, const BacktraceManager& btm)
 {
+  if (BacktraceManager::s_show) {
     const std::vector<std::string>& lines = btm.m_lines;
 
     const std::regex mangled_function(R"%(\(.*\+)%");
@@ -49,6 +58,10 @@ operator<<(std::ostream& os, const BacktraceManager& btm)
         os << line << '\n';
       }
     }
+  } else {
+    os << rang::fg::yellow << "\n[To display backtrace launch pugs with the --backtrace option]" << rang::style::reset
+       << '\n';
+  }
 
   return os;
 }

src/utils/BacktraceManager.hpp

@@ -7,9 +7,12 @@
 class BacktraceManager
 {
  private:
+  static bool s_show;
   std::vector<std::string> m_lines;
 
  public:
+  static void setShow(bool show_backtrace);
+
   BacktraceManager();
 
   friend std::ostream& operator<<(std::ostream& os, const BacktraceManager& btm);

src/utils/PugsUtils.cpp

 #include <utils/PugsUtils.hpp>
 
+#include <utils/BacktraceManager.hpp>
 #include <utils/BuildInfo.hpp>
 #include <utils/ConsoleManager.hpp>
 #include <utils/FPEManager.hpp>
@@ -104,6 +105,9 @@ initialize(int& argc, char* argv[])
 
     app.add_flag("--fpe,!--no-fpe", enable_fpe, "Trap floating point exceptions [default: true]");
 
+    bool show_backtrace = false;
+    app.add_flag("-b,--backtrace,!--no-backtrace", show_backtrace, "Show backtrace on failure [default: false]");
+
     app.add_flag("--signal,!--no-signal", enable_signals, "Catches signals [default: true]");
 
     bool pause_on_error = false;
@@ -118,6 +122,7 @@ initialize(int& argc, char* argv[])
       std::exit(app.exit(e, std::cout, std::cerr));
     }
 
+    BacktraceManager::setShow(show_backtrace);
     ConsoleManager::init(enable_color);
     SignalManager::setPauseForDebug(pause_on_error);
   }