source/core/application.cpp

   1 #include <cstring>
   2 #include <typeinfo>
   3 #include <signal.h>
   4 #include <msp/debug/demangle.h>
   5 #include <msp/debug/errorreporter.h>
   6 #include <msp/fs/dir.h>
   7 #include <msp/fs/path.h>
   8 #include <msp/fs/utils.h>
   9 #include <msp/io/print.h>
  10 #include <msp/strings/utils.h>
  11 #include "application.h"
  12 #include "getopt.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17
  18 Application *Application::app_ = 0;
  19 Application::Starter *Application::starter_ = 0;
  20 const char *Application::argv0_ = 0;
  21 string Application::name_;
  22 void *Application::data_ = 0;
  23
  24 Application::Application(const string &n):
  25         exit_code(0)
  26 {
  27         if(app_)
  28                 throw logic_error("instance already exists");
  29
  30         if(!n.empty())
  31                 name_ = n;
  32         else
  33                 name_ = FS::basename(argv0_);
  34 }
  35
  36 int Application::run(int argc, char **argv, void *data, void (*created_callback)(void *))
  37 {
  38         if(!starter_)
  39         {
  40                 IO::cerr.write("Application::run called with no RegisteredApplication class!\n");
  41                 return 126;
  42         }
  43
  44         set_startup_info(argv[0], data);
  45
  46         try
  47         {
  48                 try
  49                 {
  50                         app_ = starter_->create_app(argc, argv);
  51                 }
  52                 catch(const usage_error &e)
  53                 {
  54                         IO::print(IO::cerr, "%s\n%s\n", e.what(), e.help());
  55                         return 1;
  56                 }
  57
  58                 if(created_callback)
  59                         created_callback(data);
  60
  61                 int result = app_->main();
  62                 Application *a = app_;
  63                 app_ = 0;
  64                 delete a;
  65                 return result;
  66         }
  67         catch(const exception &e)
  68         {
  69                 bool handled = false;
  70                 if(const Debug::ErrorReporter *er = Debug::ErrorReporter::get_current())
  71                         handled = er->report_uncaught_exception(e);
  72
  73                 if(!handled)
  74                 {
  75                         IO::print(IO::cerr, "An uncaught exception occurred.\n");
  76                         IO::print(IO::cerr, "  type:   %s\n", Debug::demangle(typeid(e).name()));
  77                         vector<string> lines = split(e.what(), '\n');
  78                         if(lines.size()<2)
  79                                 IO::print(IO::cerr, "  what(): %s\n", e.what());
  80                         else
  81                         {
  82                                 IO::print(IO::cerr, "  what(): %s\n", lines.front());
  83                                 for(vector<string>::const_iterator i=lines.begin(); ++i!=lines.end(); )
  84                                         IO::print(IO::cerr, "          %s\n", *i);
  85                         }
  86                 }
  87
  88                 delete app_;
  89                 app_ = 0;
  90
  91                 return 124;
  92         }
  93 }
  94
  95 void Application::set_startup_info(const char *argv0, void *data)
  96 {
  97         if(argv0_)
  98                 throw logic_error("startup info already set");
  99
 100         static FS::Path exe;
 101
 102         if(!argv0 || !*argv0)
 103         {
 104 #ifdef _WIN32
 105                 argv0 = "application.exe";
 106 #else
 107                 argv0 = "./application";
 108 #endif
 109         }
 110
 111         bool has_slash = strchr(argv0, FS::DIRSEP);
 112         if(!has_slash)
 113                 exe = FS::path_lookup(argv0);
 114         if(exe.empty())
 115                 exe = FS::realpath(argv0);
 116
 117         argv0_ = exe.c_str();
 118         data_ = data;
 119 }
 120
 121 int Application::main()
 122 {
 123         done = false;
 124         while(!done)
 125                 tick();
 126
 127         return exit_code;
 128 }
 129
 130 void Application::catch_signal(int s)
 131 {
 132         signal(s, &sighandler_);
 133 }
 134
 135 void Application::exit(int c)
 136 {
 137         done = true;
 138         exit_code = c;
 139 }
 140
 141 void Application::sighandler_(int s)
 142 {
 143         app_->sighandler(s);
 144 }
 145
 146
 147 Application::Starter::Starter()
 148 {
 149         if(starter_)
 150                 throw logic_error("Can't create more than one Starter instance");
 151
 152         starter_ = this;
 153 }
 154
 155 } // namespace Msp