Better method of preventing duplicate applications

[libs/core.git] / source / core / application.cpp

diff --git a/source/core/application.cpp b/source/core/application.cpp
index 139f94f2d88054d745ad9119b562dd7ec174d596..d5745ed8a36ae2cbe139a14de0f1ba76c1b22d5c 100644 (file)
--- a/source/core/application.cpp
+++ b/source/core/application.cpp
@@ -1,19 +1,10 @@
-/* $Id$
-
-This file is part of libmspcore
-Copyright © 2006-2008, 2011  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include <signal.h>
-#include <iostream>
 #include <typeinfo>
-#include "../debug/backtrace.h"
-#include "../debug/demangle.h"
-#include "../time/units.h"
-#include "../time/utils.h"
+#include <signal.h>
+#include <msp/debug/demangle.h>
+#include <msp/debug/errorreporter.h>
+#include <msp/io/print.h>
 #include "application.h"
-#include "except.h"
+#include "getopt.h"
 
 using namespace std;
 
@@ -25,28 +16,16 @@ void *Application::data_ = 0;
 
 Application::Application():
        exit_code(0)
-{ }
-
-/**
-Constructs an instance of the registered application class and runs it.  If the
-application throws a UsageError, the static usage() function is called.
+{
+       if(app_)
+               throw logic_error("instance already exists");
+}
 
-This function can only be called once.  The global main() function provided by
-the library normally does it automatically at program startup.
-*/
 int Application::run(int argc, char **argv, void *data)
 {
-       static bool called = false;
-       if(called)
-       {
-               cerr<<"Trying to call Application::run_app twice!\n";
-               return 125;
-       }
-       called = true;
-
        if(!starter_)
        {
-               cerr<<"Trying to run with no RegisteredApplication class!\n";
+               IO::cerr.write("Application::run called with no RegisteredApplication class!\n");
                return 126;
        }
 
@@ -58,9 +37,9 @@ int Application::run(int argc, char **argv, void *data)
                {
                        app_ = starter_->create_app(argc, argv);
                }
-               catch(const UsageError &e)
+               catch(const usage_error &e)
                {
-                       starter_->usage(e.what(), argv[0], e.get_brief());
+                       IO::print(IO::cerr, "%s\n%s\n", e.what(), e.help());
                        return 1;
                }
 
@@ -72,49 +51,24 @@ int Application::run(int argc, char **argv, void *data)
        }
        catch(const exception &e)
        {
-               delete app_;
-
-#ifdef WIN32
-               string msg = Debug::demangle(typeid(e).name())+":\n"+e.what();
-               MessageBoxA(0, msg.c_str(), "Uncaught exception", MB_OK|MB_ICONERROR);
-#else
-               cerr<<"An uncaught exception occurred.\n";
-               cerr<<"  type:   "<<Debug::demangle(typeid(e).name())<<'\n';
-               cerr<<"  what(): "<<e.what()<<'\n';
+               bool handled = false;
+               if(const Debug::ErrorReporter *er = Debug::ErrorReporter::get_current())
+                       handled = er->report_uncaught_exception(e);
 
-               const Exception *exc = dynamic_cast<const Exception *>(&e);
-               if(exc && !exc->get_backtrace().get_frames().empty())
+               if(!handled)
                {
-                       cerr<<"  backtrace:\n";
-                       const list<Debug::Backtrace::StackFrame> &frames = exc->get_backtrace().get_frames();
-                       for(list<Debug::Backtrace::StackFrame>::const_iterator i=frames.begin(); i!=frames.end(); ++i)
-                               cerr<<"    "<<*i<<'\n';
+                       IO::print(IO::cerr, "An uncaught exception occurred.\n");
+                       IO::print(IO::cerr, "  type:   %s\n", Debug::demangle(typeid(e).name()));
+                       IO::print(IO::cerr, "  what(): %s\n", e.what());
                }
-#endif
+
+               delete app_;
+               app_ = 0;
 
                return 124;
        }
 }
 
-/**
-Prints a message describing the usage of the application.  The default version
-will blame the programmer for being lazy.
-
-@param   reason  Why the function was called
-@param   argv0   The value of argv[0], to be used in the message
-@param   brief   Whether to print a brief or long usage message
-*/
-void Application::usage(const char *reason, const char *, bool)
-{
-       if(reason)
-               cerr<<"UsageError: "<<reason<<'\n';
-       cerr<<"The programmer was lazy and didn't write a usage() function for this application.\n";
-}
-
-/**
-Default main loop.  Calls tick() repeatedly until exit() is called.  A custom
-main loop should monitor the done member variable and return exit_code.
-*/
 int Application::main()
 {
        done = false;
@@ -124,26 +78,17 @@ int Application::main()
        return exit_code;
 }
 
-/**
-Sets the specified signal to be delivered to the sighandler member function.
-*/
 void Application::catch_signal(int s)
 {
        signal(s, &sighandler_);
 }
 
-/**
-Causes the application to exit gracefully with the given exit code.
-*/
 void Application::exit(int c)
 {
        done = true;
        exit_code = c;
 }
 
-/**
-Static wrapper function to call a member function of the Application instance.
-*/
 void Application::sighandler_(int s)
 {
        app_->sighandler(s);
@@ -153,7 +98,7 @@ void Application::sighandler_(int s)
 Application::Starter::Starter()
 {
        if(starter_)
-               throw InvalidState("Can't create more than one Starter instance");
+               throw logic_error("Can't create more than one Starter instance");
 
        starter_ = this;
 }