void execute_cmds(int fd[2], const std::vector<std::string>& commands)
{
    for(std::size_t i = 0; i < commands.size(); ++i)
    {
        auto pid = fork();

        auto args = split_to_cstr(commands[i]);
        if(pid == 0)
        {
            if(i == 0)//first command
            {
                if(commands.size() > 1)
                {
                    close(fd[0]);
                    dup2(fd[1], 1);
                    //close(fd[1]);
                }
            }
            else if(i == commands.size() - 1)//last command
            {
                close(fd[1]);
                dup2(fd[0], 0);
                //close(fd[0]);
            }
            else//inner commands
            {
                dup2(fd[0], 0);
                //close(fd[0]);
                dup2(fd[1], 1);
                //close(fd[1]);
            }
            if(execvp(args[0], &args[0]) < 0)
            {
                std::perror("execvp");
                exit(EXIT_FAILURE);
            }
        }
        else if(pid < 0)
        {
            std::perror("fork");
            exit(EXIT_FAILURE);
        }
    }
}

int main()
{
    std::string prompt("microshell>"),
                input;
    int fd[2];

    while(std::cout << prompt && std::getline(std::cin, input))
    {
        if(pipe(fd) < 0)
        {
            std::perror("pipe");
            exit(EXIT_FAILURE);
        }

        std::vector<std::string> commands(get_cmds(input, "||"));

        execute_cmds(fd, commands);

        close(fd[0]);
        close(fd[1]);

        //wait for children to finish
        int pid, status;
        while ((pid = wait(&status)) != -1) ;
            //std::cerr <<  "process " << pid << " exits with " << WEXITSTATUS(status) << std::endl;
    }
}