ledger/src/main.cc

/*
 * Copyright (c) 2003-2009, John Wiegley.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of New Artisans LLC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <ledger.h>		// Read this file for a top-level overview

#include "global.h"		// This is where the meat of main() is, which
				// was moved there for the sake of clarity
using namespace ledger;

namespace {
  strings_list split_arguments(char * line)
  {
    strings_list args;

    // jww (2009-02-04): This is too naive
    for (char * p = std::strtok(line, " \t");
	 p;
	 p = std::strtok(NULL, " \t"))
      args.push_back(p);

    return args;
  }
}

int main(int argc, char * argv[], char * envp[])
{
  int status;

  // The very first thing we do is handle some very special command-line
  // options, since they affect how the environment is setup:
  //
  //   --verify            ; turns on memory tracing
  //   --verbose           ; turns on logging
  //   --debug CATEGORY    ; turns on debug logging
  //   --trace LEVEL       ; turns on trace logging
  handle_debug_options(argc, argv);
  IF_VERIFY() initialize_memory_tracing();

  INFO("Ledger starting");

  // Initialize global Boost/C++ environment
  std::ios::sync_with_stdio(false);
  filesystem::path::default_name_check(filesystem::portable_posix_name);

  std::signal(SIGINT, sigint_handler);
  std::signal(SIGPIPE, sigpipe_handler);

  // Create the session object, which maintains nearly all state relating to
  // this invocation of Ledger; and register all known journal parsers.
  std::auto_ptr<global_scope_t> global_scope(new global_scope_t(envp));

  try {
    global_scope->session().set_flush_on_next_data_file(true);

    // Construct an STL-style argument list from the process command arguments
    strings_list args;
    for (int i = 1; i < argc; i++)
      args.push_back(argv[i]);

    // Look for options and a command verb in the command-line arguments
    bind_scope_t bound_scope(*global_scope.get(), global_scope->report());

    args = global_scope->read_command_arguments(bound_scope, args);

    if (global_scope->HANDLED(script_)) {
      // Ledger is being invoked as a script command interpreter
      global_scope->session().read_journal_files();

      status = 0;

      ifstream in(global_scope->HANDLER(script_).str());
      while (status == 0 && ! in.eof()) {
	char line[1024];
	in.getline(line, 1023);

	char * p = skip_ws(line);
	if (*p && *p != '#')
	  status = global_scope->execute_command_wrapper(split_arguments(p),
							 true);
      }
    }
    else if (! args.empty()) {
      // User has invoke a verb at the interactive command-line
      status = global_scope->execute_command_wrapper(args, false);
    }
    else {
      // Commence the REPL by displaying the current Ledger version
      global_scope->show_version_info(std::cout);

      global_scope->session().read_journal_files();

      bool exit_loop = false;

#ifdef HAVE_LIBEDIT

      rl_readline_name = const_cast<char *>("Ledger");
#if 0
      // jww (2009-02-05): NYI
      rl_attempted_completion_function = ledger_completion;
#endif

      while (char * p = readline(global_scope->prompt_string())) {
	char * expansion = NULL;
	int    result;

	result = history_expand(skip_ws(p), &expansion);

	if (result < 0 || result == 2) {
	  if (expansion)
	    std::free(expansion);
	  std::free(p);
	  throw_(std::logic_error,
		 "Failed to expand history reference '" << p << "'");
	}
	else if (expansion) {
	  add_history(expansion);
	}

#else // HAVE_LIBEDIT

      while (! std::cin.eof()) {
	std::cout << global_scope->prompt_string();
	char line[1024];
	std::cin.getline(line, 1023);

	char * p = skip_ws(line);

#endif // HAVE_LIBEDIT

	bool do_command = true;

	check_for_signal();

	if (*p && *p != '#') {
	  if (std::strncmp(p, "quit", 4) == 0)
	    exit_loop = true;
	  else
	    global_scope->execute_command_wrapper(split_arguments(p), true);
	}

#ifdef HAVE_LIBEDIT
	if (expansion)
	  std::free(expansion);
	std::free(p);
#endif

	if (exit_loop)
	  break;
      }

      status = 0;			// report success
    }
  }
  catch (const std::exception& err) {
    global_scope->report_error(err);
  }
  catch (int _status) {
    status = _status;		// used for a "quick" exit, and is used only
				// if help text (such as --help) was displayed
  }

  // If memory verification is being performed (which can be very slow), clean
  // up everything by closing the session and deleting the session object, and
  // then shutting down the memory tracing subsystem.  Otherwise, let it all
  // leak because we're about to exit anyway.
  IF_VERIFY() {
    global_scope.reset();

    INFO("Ledger ended (Boost/libstdc++ may still hold memory)");
    shutdown_memory_tracing();
  } else {
    // Don't free anything, just let it all leak.
    global_scope.release();

    INFO("Ledger ended");
  }

  // Return the final status to the operating system, either 1 for error or 0
  // for a successful completion.
  return status;
}

// main.cc ends here.