{

args.clear();

size_t start_pos = 0;

size_t end_pos = 0;

while (true) {

start_pos = cmd.find_first_not_of(" \t", end_pos);

if (start_pos == std::string::npos)

break;

char start_char = cmd.at(start_pos);

if (start_char == '\'' || start_char == '\"') {

end_pos = cmd.find_first_of(start_char, start_pos + 1);

if (end_pos == std::string::npos)

return false;

args.push_back(cmd.substr(start_pos + 1, end_pos - start_pos - 1));

++end_pos;

} else {

end_pos = cmd.find_first_of(" \t", start_pos);

//! think of:

//! --key="hello world"and'I am here'

//! as whole string

auto quot_start_pos = cmd.find_first_of("\'\"", start_pos);

while (quot_start_pos != std::string::npos && (quot_start_pos < end_pos || end_pos == std::string::npos)) {

char quot_char = cmd.at(quot_start_pos);

auto quot_end_pos = cmd.find_first_of(quot_char, quot_start_pos + 1);

end_pos = cmd.find_first_of(" \t", quot_end_pos + 1);

quot_start_pos = cmd.find_first_of("\'\"", quot_end_pos + 1);

}

args.push_back(cmd.substr(start_pos, end_pos - start_pos));

if (end_pos == std::string::npos)

break;

}

}

return true;