Invent a value for argv[0] if not present

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

diff --git a/source/core/application.cpp b/source/core/application.cpp
index 51f013e72c3cb5876429035d2604c95eb1a1f578..aedaa4b6f25c027429f8bff1a5c069078206e7df 100644 (file)
--- a/source/core/application.cpp
+++ b/source/core/application.cpp
@@ -1,9 +1,11 @@
-#ifdef WIN32
-#include <windows.h>
-#endif
-#include <signal.h>
+#include <cstring>
 #include <typeinfo>
+#include <signal.h>
 #include <msp/debug/demangle.h>
+#include <msp/debug/errorreporter.h>
+#include <msp/fs/dir.h>
+#include <msp/fs/path.h>
+#include <msp/fs/utils.h>
 #include <msp/io/print.h>
 #include "application.h"
 #include "getopt.h"
@@ -14,37 +16,31 @@ namespace Msp {
 
 Application *Application::app_ = 0;
 Application::Starter *Application::starter_ = 0;
+const char *Application::argv0_ = 0;
+string Application::name_;
 void *Application::data_ = 0;
 
-Application::Application():
+Application::Application(const string &n):
        exit_code(0)
-{ }
+{
+       if(app_)
+               throw logic_error("instance already exists");
 
-/**
-Constructs an instance of the registered application class and runs it.  If the
-application throws a usage_error, a help message is printed.  The GetOpt class
-will throw such exceptions automatically in error conditions.
+       if(!n.empty())
+               name_ = n;
+       else
+               name_ = FS::basename(argv0_);
+}
 
-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)
+int Application::run(int argc, char **argv, void *data, void (*created_callback)(void *))
 {
-       static bool called = false;
-       if(called)
-       {
-               IO::cerr.write("Trying to call Application::run_app twice!\n");
-               return 125;
-       }
-       called = true;
-
        if(!starter_)
        {
-               IO::cerr.write("Trying to run with no RegisteredApplication class!\n");
+               IO::cerr.write("Application::run called with no RegisteredApplication class!\n");
                return 126;
        }
 
-       data_ = data;
+       set_startup_info(argv[0], data);
 
        try
        {
@@ -58,6 +54,9 @@ int Application::run(int argc, char **argv, void *data)
                        return 1;
                }
 
+               if(created_callback)
+                       created_callback(data);
+
                int result = app_->main();
                Application *a = app_;
                app_ = 0;
@@ -66,25 +65,50 @@ int Application::run(int argc, char **argv, void *data)
        }
        catch(const exception &e)
        {
+               bool handled = false;
+               if(const Debug::ErrorReporter *er = Debug::ErrorReporter::get_current())
+                       handled = er->report_uncaught_exception(e);
+
+               if(!handled)
+               {
+                       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());
+               }
+
                delete app_;
+               app_ = 0;
+
+               return 124;
+       }
+}
+
+void Application::set_startup_info(const char *argv0, void *data)
+{
+       if(argv0_)
+               throw logic_error("startup info already set");
 
-#ifdef WIN32
-               string msg = Debug::demangle(typeid(e).name())+":\n"+e.what();
-               MessageBoxA(0, msg.c_str(), "Uncaught exception", MB_OK|MB_ICONERROR);
+       static FS::Path exe;
+
+       if(!argv0 || !*argv0)
+       {
+#ifdef _WIN32
+               argv0 = "application.exe";
 #else
-               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());
+               argv0 = "./application";
 #endif
-
-               return 124;
        }
+
+       bool has_slash = strchr(argv0, FS::DIRSEP);
+       if(!has_slash)
+               exe = FS::path_lookup(argv0);
+       if(exe.empty())
+               exe = FS::realpath(argv0);
+
+       argv0_ = exe.c_str();
+       data_ = data;
 }
 
-/**
-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;
@@ -94,26 +118,17 @@ 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);