168 lines
6.9 KiB
C++
168 lines
6.9 KiB
C++
/*
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* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <ledger.h> // Read this file for a top-level overview
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#include "work.h" // This is where the meat of main() is, which
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// was moved there for the sake of clarity
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int main(int argc, char * argv[], char * envp[])
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{
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using namespace ledger;
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session_t * session = NULL;
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int status = 1;
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try {
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// The very first thing we do is handle some very special command-line
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// options, since they affect how the environment is setup:
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//
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// --verify ; turns on memory tracing
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// --verbose ; turns on logging
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// --debug CATEGORY ; turns on debug logging
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// --trace LEVEL ; turns on trace logging
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handle_debug_options(argc, argv);
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IF_VERIFY() initialize_memory_tracing();
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INFO("Ledger starting");
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// Initialize global Boost/C++ environment
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std::ios::sync_with_stdio(false);
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filesystem::path::default_name_check(filesystem::portable_posix_name);
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// Create the session object, which maintains nearly all state relating to
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// this invocation of Ledger; and register all known journal parsers.
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session = new LEDGER_SESSION_T;
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register_journal_parsers(*session);
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set_session_context(session);
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// Create the report object, which maintains state relating to each
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// command invocation. Because we're running from main(), the distinction
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// between session and report doesn't really matter, but if a GUI were
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// calling into Ledger it would have one session object per open document,
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// with a separate report_t object for each report it generated.
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session->report.reset(new report_t(*session));
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report_t& report(*session->report.get());
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// Read the user's options, in the following order:
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//
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// 1. environment variables (LEDGER_<option>)
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// 2. initialization file (~/.ledgerrc)
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// 3. command-line (--option or -o)
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//
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// Before processing command-line options, we must notify the session
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// object that such options are beginning, since options like -f cause a
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// complete override of files found anywhere else.
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read_environment_settings(report, envp);
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session->read_init(); // accesses report object via session.report
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session->now_at_command_line(true);
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strings_list args = read_command_line_arguments(report, argc, argv);
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// Look for a precommand first, which is defined as any defined function
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// whose name starts with "ledger_precmd_". The difference between a
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// precommand and a regular command is that precommands ignore the journal
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// data file completely, nor is the user's init file read.
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//
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// Here are some examples of pre-commands:
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//
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// parse STRING ; show how a value expression is parsed
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// eval STRING ; simply evaluate a value expression
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// format STRING ; show how a format string is parsed
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//
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// If such a command is found, create the output stream for the result and
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// then invoke the command.
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string_iterator arg = args.begin();
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string verb = *arg++;
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if (function_t command = look_for_precommand(report, verb)) {
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// Create the output stream (it might be a file, the console or a PAGER
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// subprocess) and invoke the report command.
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create_output_stream(report);
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invoke_command_verb(report, command, arg, args.end());
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}
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else if (function_t command = look_for_command(report, verb)) {
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// This is regular command verb, so parse the user's data.
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if (journal_t * journal = read_journal_files(*session)) {
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normalize_report_options(report, verb); // jww (2009-02-02): a hack
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// Create the output stream (it might be a file, the console or a
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// PAGER subprocess) and invoke the report command.
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create_output_stream(report);
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invoke_command_verb(report, command, arg, args.end());
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// Write out a binary cache of the journal data, if needful and
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// appropriate to do so.
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write_binary_cache(*session, journal);
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}
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}
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else {
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throw_(std::logic_error, "Unrecognized command '" << verb << "'");
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}
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// If we've reached this point, everything succeeded fine. Ledger uses
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// exceptions to notify of error conditions, so if you're using gdb, just
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// type "catch throw" to find the source point of any error.
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status = 0;
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}
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catch (const std::exception& err) {
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std::cout.flush(); // first display anything that was pending
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std::cerr << error_context() << std::endl
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<< "Error: " << err.what() << std::endl;
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}
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catch (int _status) {
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status = _status; // used for a "quick" exit, and is used only
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// if help text (such as --help) was displayed
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}
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// Close the output stream, waiting on the pager process to exit if need be
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session->report->output_stream.close();
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// If memory verification is being performed (which can be very slow), clean
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// up everything by closing the session and deleting the session object, and
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// then shutting down the memory tracing subsystem. Otherwise, let it all
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// leak because we're about to exit anyway.
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IF_VERIFY() {
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set_session_context(NULL);
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if (session != NULL)
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checked_delete(session);
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INFO("Ledger ended (Boost/libstdc++ may still hold memory)");
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shutdown_memory_tracing();
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} else {
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// Don't free anything, just let it all leak.
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INFO("Ledger ended");
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}
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// Return the final status to the operating system, either 1 for error or 0
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// for a successful completion.
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return status;
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}
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// main.cc ends here.
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