Poor-Mans-IDS/cli.cpp

/*********************************************************************
 * C++ Base Application Object
 * Written by Jonathan A. Foster <jon@jfpossibilities.com
 * Started August 31st, 2020
 *********************************************************************/
//#include <ostream>
#include <iostream>
#include <cstdlib>
#include <sys/stat.h>
#include <sys/types.h>
#include "cli.h"



/*********************************************************************
 * cBaseApp
 *********************************************************************/
cBaseApp *baseapp = 0;



cBaseApp &cBaseApp::init(int argc, char **argv) {
  command_argc = argc;
  command_args = argv;
}



unsigned cBaseApp::do_switch(const char *arg) {
  throw CLIerror("Invalid switch '"+std::string(arg)+"'");
}



int cBaseApp::main() {
  int i, ct;
  char *p;
  bool switches = true;

  for(i=1; i<command_argc; i++) {
    if(switches && *command_args[i]=='-') { // switches!
      ct=0;
      if(command_args[i][1]=='-') { // long switches
        if(command_args[i][2]==0) { // --
          switches=false;
          continue;
        }
        p  = command_args[i]+2;
        ct = do_switch(p);

      } else { // short switches
        for(p=command_args[i]+1; *p; p++) {
          if(ct) throw std::runtime_error(
            "Only the last switch in stacked short switches can require an argument"
          );
          ct = do_switch(p);
        }
        p--;
      }

      // switch arguments
      while(ct--) {
        if(++i>=command_argc) throw std::runtime_error(
          "Last switch requires more arguments"
        );
        do_switch_arg(p, command_args[i]);
      }

    } else // non-switch arguments
      do_arg(command_args[i]);
  }
  return ExitCode;
}



int cBaseApp::help() {
  std::cerr <<
    "Invalid command line arguments and the developer didn't provide any help."
    << std::endl;
  return ExitCode = 1;
}



int cBaseApp::crash(const std::exception &e) {
  std::cerr << "Application crashed: " << e.what() << std::endl;
  return 216; // just a weird number hopefully not conflicting with anything else.
}