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#include "readline_buffer.h"
#include <readline/readline.h>
#include <readline/history.h>
#include <sys/select.h>
#include <unistd.h>
#include <mutex>
#include <condition_variable>
#include <boost/thread.hpp>
static int process_input();
static void install_line_handler();
static void remove_line_handler();
static std::string last_line;
static std::string last_prompt;
std::mutex line_mutex, sync_mutex, process_mutex;
std::condition_variable have_line;
namespace
{
rdln::readline_buffer* current = NULL;
}
rdln::suspend_readline::suspend_readline()
: m_buffer(NULL), m_restart(false)
{
m_buffer = current;
if(!m_buffer)
return;
m_restart = m_buffer->is_running();
if(m_restart)
m_buffer->stop();
}
rdln::suspend_readline::~suspend_readline()
{
if(!m_buffer)
return;
if(m_restart)
m_buffer->start();
}
rdln::readline_buffer::readline_buffer()
: std::stringbuf(), m_cout_buf(NULL)
{
current = this;
}
void rdln::readline_buffer::start()
{
std::unique_lock<std::mutex> lock(process_mutex);
if(m_cout_buf != NULL)
return;
m_cout_buf = std::cout.rdbuf();
std::cout.rdbuf(this);
install_line_handler();
}
void rdln::readline_buffer::stop()
{
std::unique_lock<std::mutex> lock(process_mutex);
if(m_cout_buf == NULL)
return;
std::cout.rdbuf(m_cout_buf);
m_cout_buf = NULL;
remove_line_handler();
}
void rdln::readline_buffer::get_line(std::string& line) const
{
std::unique_lock<std::mutex> lock(line_mutex);
have_line.wait(lock);
line = last_line;
}
void rdln::readline_buffer::set_prompt(const std::string& prompt)
{
last_prompt = prompt;
if(m_cout_buf == NULL)
return;
rl_set_prompt(last_prompt.c_str());
rl_redisplay();
}
int rdln::readline_buffer::process()
{
process_mutex.lock();
if(m_cout_buf == NULL)
{
process_mutex.unlock();
boost::this_thread::sleep_for(boost::chrono::milliseconds( 1 ));
return 0;
}
int count = process_input();
process_mutex.unlock();
boost::this_thread::sleep_for(boost::chrono::milliseconds( 1 ));
return count;
}
int rdln::readline_buffer::sync()
{
std::lock_guard<std::mutex> lock(sync_mutex);
char* saved_line;
int saved_point;
saved_point = rl_point;
saved_line = rl_copy_text(0, rl_end);
rl_set_prompt("");
rl_replace_line("", 0);
rl_redisplay();
do
{
char x = this->sgetc();
m_cout_buf->sputc(x);
}
while ( this->snextc() != EOF );
rl_set_prompt(last_prompt.c_str());
rl_replace_line(saved_line, 0);
rl_point = saved_point;
rl_redisplay();
free(saved_line);
return 0;
}
static int process_input()
{
int count;
struct timeval t;
fd_set fds;
t.tv_sec = 0;
t.tv_usec = 1000;
FD_ZERO(&fds);
FD_SET(STDIN_FILENO, &fds);
count = select(STDIN_FILENO + 1, &fds, NULL, NULL, &t);
if (count < 1)
{
return count;
}
rl_callback_read_char();
return count;
}
static void handle_line(char* line)
{
if (line != NULL)
{
std::lock_guard<std::mutex> lock(sync_mutex);
rl_set_prompt(last_prompt.c_str());
rl_already_prompted = 1;
return;
}
rl_set_prompt("");
rl_replace_line("", 0);
rl_redisplay();
rl_set_prompt(last_prompt.c_str());
}
static int handle_enter(int x, int y)
{
std::lock_guard<std::mutex> lock(sync_mutex);
char* line = NULL;
line = rl_copy_text(0, rl_end);
rl_set_prompt("");
rl_replace_line("", 1);
rl_redisplay();
if (strcmp(line, "") != 0)
{
last_line = line;
add_history(line);
have_line.notify_one();
}
free(line);
if(last_line != "exit")
{
rl_set_prompt(last_prompt.c_str());
rl_redisplay();
}
rl_done = 1;
return 0;
}
static int startup_hook()
{
rl_bind_key(RETURN, handle_enter);
rl_bind_key(NEWLINE, handle_enter);
return 0;
}
static void install_line_handler()
{
rl_startup_hook = startup_hook;
rl_callback_handler_install("", handle_line);
}
static void remove_line_handler()
{
rl_unbind_key(RETURN);
rl_callback_handler_remove();
}
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