advgetopt_options.cpp

Go to the documentation of this file.

// Copyright (c) 2006-2024  Made to Order Software Corp.  All Rights Reserved
//
// https://snapwebsites.org/project/advgetopt
// contact@m2osw.com
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
// self
//
#include    "advgetopt/advgetopt.h"
 
#include    "advgetopt/conf_file.h"
#include    "advgetopt/exception.h"
 
 
// cppthread
//
#include    <cppthread/log.h>
 
 
// snapdev
//
#include    <snapdev/join_strings.h>
#include    <snapdev/tokenize_string.h>
 
 
// C++
//
#include    <list>
 
 
// last include
//
#include    <snapdev/poison.h>
 
 
 
 
namespace advgetopt
{
 
 
 
 
 
 
 
void getopt::reset()
{
    for(auto & opt : f_options_by_name)
    {
        opt.second->reset();
    }
}
 
 
void getopt::parse_options_info(option const * opts, bool ignore_duplicates)
{
    if(opts == nullptr)
    {
        return;
    }
 
    for(
      ; (opts->f_flags & GETOPT_FLAG_END) == 0
      ; ++opts)
    {
        if(opts->f_name == nullptr
        || opts->f_name[0] == '\0')
        {
            throw getopt_logic_error("option long name missing or empty.");
        }
        short_name_t const one_char(string_to_short_name(opts->f_name));
        if(one_char != NO_SHORT_NAME)
        {
            throw getopt_logic_error("a long name option must be at least 2 characters.");
        }
 
        short_name_t short_name(opts->f_short_name);
 
        option_info::pointer_t o(std::make_shared<option_info>(
                                              opts->f_name
                                            , short_name));
        o->set_variables(f_variables);
 
        o->set_environment_variable_name(opts->f_environment_variable_name);
        o->add_flag(opts->f_flags);
        o->set_default(opts->f_default);
        o->set_help(opts->f_help);
        o->set_multiple_separators(opts->f_multiple_separators);
 
        if(opts->f_validator != nullptr)
        {
            o->set_validator(opts->f_validator);
        }
 
        add_option(o, ignore_duplicates);
    }
}
 
 
void getopt::add_option(option_info::pointer_t opt, bool ignore_duplicates)
{
    if(get_option(opt->get_name(), true) != nullptr)
    {
        if(ignore_duplicates)
        {
            return;
        }
        throw getopt_defined_twice(
                  std::string("option named \"")
                + opt->get_name()
                + "\" found twice.");
    }
 
    short_name_t short_name(opt->get_short_name());
    if(get_option(short_name, true) != nullptr)
    {
        if(ignore_duplicates)
        {
            short_name = NO_SHORT_NAME;
            opt->set_short_name(NO_SHORT_NAME);
        }
        else
        {
            throw getopt_defined_twice(
                      "option with short name \""
                    + short_name_to_string(short_name)
                    + "\" found twice.");
        }
    }
 
    if(opt->is_default_option())
    {
        if(f_default_option != nullptr)
        {
            throw getopt_logic_error("two default options found.");
        }
        if(opt->has_flag(GETOPT_FLAG_FLAG))
        {
            throw getopt_logic_error("a default option must accept parameters, it can't be a GETOPT_FLAG_FLAG.");
        }
 
        f_default_option = opt;
    }
 
    f_options_by_name[opt->get_name()] = opt;
 
    if(short_name != NO_SHORT_NAME)
    {
        f_options_by_short_name[short_name] = opt;
    }
}
 
 
std::string getopt::get_options_filename() const
{
    std::string const filename(get_group_or_project_name());
    if(filename.empty())
    {
        return std::string();
    }
 
    std::string path;
    char const * const options_files_directory(getenv("ADVGETOPT_OPTIONS_FILES_DIRECTORY"));
    if(options_files_directory != nullptr
    && *options_files_directory != '\0')
    {
        path = options_files_directory;
    }
    else if(f_options_environment.f_options_files_directory != nullptr
         && f_options_environment.f_options_files_directory[0] != '\0')
    {
        path = f_options_environment.f_options_files_directory;
    }
    else
    {
        path = "/usr/share/advgetopt/options/";
    }
    if(path.back() != '/')
    {
        path += '/';
    }
 
    return path + filename + ".ini";
}
 
 
void getopt::parse_options_from_file()
{
    parse_options_from_file(get_options_filename(), 1, 1);
}
 
 
void getopt::parse_options_from_file(
          std::string const & filename
        , int min_sections
        , int max_sections
        , bool ignore_duplicates)
{
    if(filename.empty())
    {
        return;
    }
 
    section_operator_t operators(SECTION_OPERATOR_INI_FILE);
    if(min_sections == 1
    && max_sections == 1)
    {
        operators |= SECTION_OPERATOR_ONE_SECTION;
    }
 
    conf_file_setup conf_setup(
              filename
            , line_continuation_t::line_continuation_unix
            , ASSIGNMENT_OPERATOR_EQUAL
            , COMMENT_INI | COMMENT_SHELL
            , operators);
    if(!conf_setup.is_valid())
    {
        return;  // LCOV_EXCL_LINE
    }
 
    // if the file includes a section named after the group or project
    // we can remove it completely (this helps with sharing fluid settings)
    //
    std::string const section_to_ignore(get_group_or_project_name());
    conf_setup.set_section_to_ignore(section_to_ignore);
 
    conf_file::pointer_t conf(conf_file::get_conf_file(conf_setup));
    conf_file::sections_t const & sections(conf->get_sections());
    for(auto & section_names : sections)
    {
        string_list_t names;
        split_string(section_names, names, {"::"});
        std::string option_name;
        if(names.size() > 1
        && *names.begin() == section_to_ignore)
        {
            names.erase(names.begin());
            option_name = snapdev::join_strings(names, "::");
        }
        else
        {
            option_name = section_names;
        }
 
        if(names.size() < static_cast<std::size_t>(min_sections)
        || names.size() > static_cast<std::size_t>(max_sections))
        {
            if(min_sections == 1
            && max_sections == 1)  // LCOV_EXCL_LINE
            {
                // right now this case cannot happen because we set the
                // SECTION_OPERATOR_ONE_SECTION flag so errors are caught
                // directly inside the conf_file::get_conf_file() call
                //
                cppthread::log << cppthread::log_level_t::error                             // LCOV_EXCL_LINE
                    << "the name of a settings definition must include one namespace; \""   // LCOV_EXCL_LINE
                    << section_names                                                        // LCOV_EXCL_LINE
                    << "\" is not considered valid."                                        // LCOV_EXCL_LINE
                    << cppthread::end;                                                      // LCOV_EXCL_LINE
            }
            else
            {
                cppthread::log << cppthread::log_level_t::error
                    << "the name of a settings definition must include between "
                    << min_sections
                    << " and "
                    << max_sections
                    << " namespaces; \""
                    << section_names
                    << "\" is not considered valid."
                    << cppthread::end;
            }
            continue;
        }
 
        std::string const parameter_name(option_name);
        std::string const short_name(unquote(conf->get_parameter(parameter_name + "::shortname")));
        if(short_name.length() > 1)
        {
            throw getopt_logic_error(
                      "option \""
                    + section_names
                    + "\" has an invalid short name in \""
                    + filename
                    + "\", it can't be more than one character.");
        }
        short_name_t const sn(short_name.length() == 1
                                    ? short_name[0]
                                    : NO_SHORT_NAME);
 
        option_info::pointer_t opt(std::make_shared<option_info>(parameter_name, sn));
        opt->set_variables(f_variables);
 
        std::string const environment_variable_name(parameter_name + "::environment_variable_name");
        if(conf->has_parameter(environment_variable_name))
        {
            opt->set_environment_variable_name(unquote(conf->get_parameter(environment_variable_name)));
        }
 
        std::string const default_name(parameter_name + "::default");
        if(conf->has_parameter(default_name))
        {
            opt->set_default(unquote(conf->get_parameter(default_name)));
        }
 
        opt->set_help(unquote(conf->get_parameter(parameter_name + "::help")));
 
        std::string const validator_name_and_params(conf->get_parameter(parameter_name + "::validator"));
        opt->set_validator(validator_name_and_params);
 
        std::string const alias_name(parameter_name + "::alias");
        if(conf->has_parameter(alias_name))
        {
            if(!opt->get_help().empty())
            {
                throw getopt_logic_error(
                          "option \""
                        + section_names
                        + "\" is an alias and as such it can't include a help=... parameter in \""
                        + filename
                        + "\".");
            }
            opt->set_help(unquote(conf->get_parameter(alias_name)));
            opt->add_flag(GETOPT_FLAG_ALIAS);
        }
 
        std::string const allowed_name(parameter_name + "::allowed");
        if(conf->has_parameter(allowed_name))
        {
            std::string const allowed_list(conf->get_parameter(allowed_name));
            string_list_t allowed;
            split_string(allowed_list, allowed, {","});
            for(auto const & a : allowed)
            {
                if(a == "command-line")
                {
                    opt->add_flag(GETOPT_FLAG_COMMAND_LINE);
                }
                else if(a == "environment-variable")
                {
                    opt->add_flag(GETOPT_FLAG_ENVIRONMENT_VARIABLE);
                }
                else if(a == "configuration-file")
                {
                    opt->add_flag(GETOPT_FLAG_CONFIGURATION_FILE);
                }
                else if(a == "dynamic-configuration")
                {
                    opt->add_flag(GETOPT_FLAG_DYNAMIC_CONFIGURATION);
                }
            }
        }
 
        std::string const group_name(parameter_name + "::group");
        if(conf->has_parameter(group_name))
        {
            std::string const group(conf->get_parameter(group_name));
            if(group == "commands")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_COMMANDS);
            }
            else if(group == "options")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_OPTIONS);
            }
            else if(group == "three")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_THREE);
            }
            else if(group == "four")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_FOUR);
            }
            else if(group == "five")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_FIVE);
            }
            else if(group == "six")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_SIX);
            }
            else if(group == "seven")
            {
                opt->add_flag(GETOPT_FLAG_GROUP_SEVEN);
            }
        }
 
        if(conf->has_parameter(parameter_name + "::show-usage-on-error"))
        {
            opt->add_flag(GETOPT_FLAG_SHOW_USAGE_ON_ERROR);
        }
 
        if(conf->has_parameter(parameter_name + "::no-arguments"))
        {
            opt->add_flag(GETOPT_FLAG_FLAG);
        }
 
        if(conf->has_parameter(parameter_name + "::multiple"))
        {
            opt->add_flag(GETOPT_FLAG_MULTIPLE);
        }
 
        if(conf->has_parameter(parameter_name + "::required"))
        {
            opt->add_flag(GETOPT_FLAG_REQUIRED);
        }
 
        add_option(opt, ignore_duplicates);
    }
}
 
 
void getopt::link_aliases()
{
    for(auto & c : f_options_by_name)
    {
        if(c.second->has_flag(GETOPT_FLAG_ALIAS))
        {
            std::string const & alias_name(c.second->get_help());
            if(alias_name.empty())
            {
                throw getopt_logic_error(
                          "the default value of your alias cannot be an empty string for \""
                        + c.first
                        + "\".");
            }
 
            // we have to use the `true` flag in this get_option() because
            // aliases may not yet be defined
            //
            option_info::pointer_t alias(get_option(alias_name, true));
            if(alias == nullptr)
            {
                throw getopt_logic_error(
                          "no option named \""
                        + alias_name
                        + "\" to satisfy the alias of \""
                        + c.first
                        + "\".");
            }
 
            flag_t const expected_flags(c.second->get_flags() & ~GETOPT_FLAG_ALIAS);
            if(alias->get_flags() != expected_flags)
            {
                std::stringstream ss;
                ss << std::hex
                   << "the flags of alias \""
                   << c.first
                   << "\" (0x"
                   << expected_flags
                   << ") are different than the flags of \""
                   << alias_name
                   << "\" (0x"
                   << alias->get_flags()
                   << ").";
                throw getopt_logic_error(ss.str());
            }
 
            c.second->set_alias_destination(alias);
        }
    }
}
 
 
void getopt::set_short_name(std::string const & name, short_name_t short_name)
{
    auto opt(f_options_by_name.find(name));
    if(opt == f_options_by_name.end())
    {
        throw getopt_logic_error(
                  "option with name \""
                + name
                + "\" not found.");
    }
 
    if(short_name != NO_SHORT_NAME)
    {
        auto it(f_options_by_short_name.find(short_name));
        if(it != f_options_by_short_name.end())
        {
            if(it->second == opt->second)
            {
                // same option, already named 'short_name'
                //
                return;
            }
 
            throw getopt_logic_error(
                      "found another option (\""
                    + it->second->get_name()
                    + "\") with short name '"
                    + short_name_to_string(short_name)
                    + "'.");
        }
    }
 
    short_name_t const old_short_name(opt->second->get_short_name());
    if(old_short_name != NO_SHORT_NAME)
    {
        auto it(f_options_by_short_name.find(old_short_name));
        if(it != f_options_by_short_name.end())
        {
            f_options_by_short_name.erase(it);
        }
    }
 
    opt->second->set_short_name(short_name);
 
    if(short_name != NO_SHORT_NAME)
    {
        f_options_by_short_name[short_name] = opt->second;
    }
}
 
 
void getopt::show_option_sources(std::basic_ostream<char> & out)
{
    int idx(1);
    out << "Option Sources:\n";
    for(auto const & opt : f_options_by_name)
    {
        out << "  " << idx << ". option \"" << opt.second->get_name() << "\"";
        string_list_t sources(opt.second->trace_sources());
        if(sources.empty())
        {
            out << " (undefined)\n";
        }
        else
        {
            out << "\n";
            for(auto const & src : sources)
            {
                out << "     " << src << "\n";
            }
        }
        out << "\n";
 
        ++idx;
    }
    out << std::flush;
}
 
 
 
} // namespace advgetopt
// vim: ts=4 sw=4 et