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/**
* $Id: getoptwrapper.cpp 2 2009-10-31 02:48:23Z l0728348 $
*
* Copyright 2009
*
* @author Manuel Mausz (0728348)
* @brief Wraps around getopt_long() using two classes
* class CommandOption represents a valid commandline option
* class CommandOptionParse calls getopt_long
* and generates usage message
*/
#include <sstream>
#include <iomanip>
#include <algorithm>
#include <stdexcept>
#include <unistd.h>
#include "getoptwrapper.h"
using namespace std;
CommandOptionParse::CommandOptionList cmdoptionlist;
/*----------------------------------------------------------------------------*/
const std::string CommandOption::printParameters()
{
ostringstream oss;
if (!m_longopt.empty() && m_shortopt != 0)
oss << "-" << m_shortopt << " [ --" << m_longopt << " ]";
else if (!m_longopt.empty() && m_shortopt == 0)
oss << "--" << m_longopt;
else if (m_longopt.empty() && m_shortopt != 0)
oss << "-" << m_shortopt;
if (m_type == needArg)
oss << " arg";
else if (m_type == optArg)
oss << " [ arg ]";
return oss.str();
}
/*----------------------------------------------------------------------------*/
void CommandOption::foundOption(const char *value)
{
m_count++;
if (value != NULL)
m_value = value;
}
/*----------------------------------------------------------------------------*/
bool CommandOptionParse::parse()
{
CommandOptionList::iterator it;
/* build optstring */
m_optstring = "";
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
CommandOption *opt = *it;
if (opt->m_shortopt == 0)
continue;
m_optstring += opt->m_shortopt;
if (opt->m_type == CommandOption::needArg)
m_optstring += ':';
if (opt->m_type == CommandOption::optArg)
m_optstring += "::";
}
/* build longopts */
if (m_longopts != NULL)
delete[] m_longopts;
m_longopts = new option[m_cmdlist.size() + 1];
int i = 0;
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
CommandOption *opt = *it;
if (opt->m_longopt.empty())
continue;
m_longopts[i].name = opt->m_longopt.c_str();
m_longopts[i].has_arg = opt->m_type;
m_longopts[i].flag = 0;
m_longopts[i].val = 0;
++i;
}
/* append NULL-row */
m_longopts[i].name = 0;
m_longopts[i].has_arg = 0;
m_longopts[i].flag = 0;
m_longopts[i].val = 0;
//opterr = 0; // no errors from getopt_long!
int opt;
int optindex = 0;
while ((opt = getopt_long(m_argc, m_argv, m_optstring.c_str(), m_longopts, &optindex)) != -1)
{
if (opt == '?')
return 0;
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
CommandOption *option = *it;
if (opt == 0)
{
if (option->m_longopt == m_longopts[optindex].name)
option->foundOption(optarg);
}
else if (opt == option->m_shortopt)
option->foundOption(optarg);
}
}
return 1;
}
/*----------------------------------------------------------------------------*/
const std::string CommandOptionParse::usage()
{
ostringstream oss;
string me(m_argv[0]);
/* build usage/synopsis */
oss << "Usage: ";
if (!m_synopsis.empty())
{
oss << me << " " << m_synopsis.at(0) << endl;
for (unsigned i = 1; i < m_synopsis.size(); ++i)
oss << " " << me << " " << m_synopsis.at(i) << endl;
}
else
oss << me << " [OPTION]..." << endl;
/* find maximum width of options */
CommandOptionList::iterator it;
unsigned width = 20; // default
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
stringstream tmpss;
tmpss << (*it)->printParameters();
width = (max)(width, static_cast<unsigned>(tmpss.str().size()));
}
width += 2;
/* print allowed options + description */
oss << endl << m_description << ":" << endl;
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
oss << " " << setw(width) << left << (*it)->printParameters()
<< (*it)->m_description << endl;
}
return oss.str();
}
/*----------------------------------------------------------------------------*/
CommandOption& CommandOptionParse::operator[](const std::string& longopt)
{
CommandOptionList::iterator it;
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
CommandOption *opt = *it;
if (opt->m_longopt == longopt)
return *opt;
}
throw out_of_range("option not found");
}
/*----------------------------------------------------------------------------*/
CommandOption& CommandOptionParse::operator[](const char shortopt)
{
CommandOptionList::iterator it;
for (it = m_cmdlist.begin(); it != m_cmdlist.end(); ++it)
{
CommandOption *opt = *it;
if (opt->m_shortopt == shortopt)
return *opt;
}
throw out_of_range("option not found");
}
/* vim: set et sw=2 ts=2: */
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