2017-05-29 22:39:49 +00:00
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#include "readline_buffer.h"
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#include <readline/readline.h>
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#include <readline/history.h>
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#include <sys/select.h>
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#include <unistd.h>
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#include <mutex>
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#include <condition_variable>
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static int process_input();
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static void install_line_handler();
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static void remove_line_handler();
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static std::string last_line;
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static std::string last_prompt;
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2017-06-22 12:15:18 +00:00
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std::mutex line_mutex, sync_mutex, process_mutex;
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2017-05-29 22:39:49 +00:00
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std::condition_variable have_line;
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namespace
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{
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rdln::readline_buffer* current = NULL;
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}
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rdln::suspend_readline::suspend_readline()
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2017-06-22 12:15:18 +00:00
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: m_buffer(NULL), m_restart(false)
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2017-05-29 22:39:49 +00:00
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{
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m_buffer = current;
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if(!m_buffer)
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return;
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m_restart = m_buffer->is_running();
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if(m_restart)
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m_buffer->stop();
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}
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rdln::suspend_readline::~suspend_readline()
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{
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if(!m_buffer)
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return;
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if(m_restart)
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m_buffer->start();
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}
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rdln::readline_buffer::readline_buffer()
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2017-06-21 16:33:47 +00:00
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: std::stringbuf(), m_cout_buf(NULL)
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2017-05-29 22:39:49 +00:00
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{
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current = this;
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}
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void rdln::readline_buffer::start()
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{
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2017-06-22 12:15:18 +00:00
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std::unique_lock<std::mutex> lock(process_mutex);
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2017-05-29 22:39:49 +00:00
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if(m_cout_buf != NULL)
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return;
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m_cout_buf = std::cout.rdbuf();
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std::cout.rdbuf(this);
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install_line_handler();
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}
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void rdln::readline_buffer::stop()
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{
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2017-06-22 12:15:18 +00:00
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std::unique_lock<std::mutex> lock(process_mutex);
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2017-05-29 22:39:49 +00:00
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if(m_cout_buf == NULL)
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return;
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std::cout.rdbuf(m_cout_buf);
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m_cout_buf = NULL;
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remove_line_handler();
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}
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2017-06-21 16:33:30 +00:00
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void rdln::readline_buffer::get_line(std::string& line) const
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2017-05-29 22:39:49 +00:00
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{
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std::unique_lock<std::mutex> lock(line_mutex);
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have_line.wait(lock);
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line = last_line;
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}
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void rdln::readline_buffer::set_prompt(const std::string& prompt)
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{
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last_prompt = prompt;
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if(m_cout_buf == NULL)
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return;
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rl_set_prompt(last_prompt.c_str());
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rl_redisplay();
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}
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int rdln::readline_buffer::process()
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{
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2017-06-22 12:15:18 +00:00
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std::unique_lock<std::mutex> lock(process_mutex);
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2017-05-29 22:39:49 +00:00
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if(m_cout_buf == NULL)
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return 0;
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return process_input();
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}
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int rdln::readline_buffer::sync()
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{
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std::lock_guard<std::mutex> lock(sync_mutex);
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char* saved_line;
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int saved_point;
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saved_point = rl_point;
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saved_line = rl_copy_text(0, rl_end);
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rl_set_prompt("");
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rl_replace_line("", 0);
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rl_redisplay();
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do
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{
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char x = this->sgetc();
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m_cout_buf->sputc(x);
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}
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while ( this->snextc() != EOF );
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rl_set_prompt(last_prompt.c_str());
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rl_replace_line(saved_line, 0);
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rl_point = saved_point;
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rl_redisplay();
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free(saved_line);
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return 0;
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}
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static fd_set fds;
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static int process_input()
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{
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int count;
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struct timeval t;
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t.tv_sec = 0;
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2017-06-23 12:21:50 +00:00
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t.tv_usec = 1000;
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2017-05-29 22:39:49 +00:00
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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count = select(FD_SETSIZE, &fds, NULL, NULL, &t);
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if (count < 1)
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{
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return count;
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}
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rl_callback_read_char();
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return count;
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}
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static void handle_line(char* line)
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{
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if (line != NULL)
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{
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std::lock_guard<std::mutex> lock(sync_mutex);
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rl_set_prompt(last_prompt.c_str());
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rl_already_prompted = 1;
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return;
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}
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rl_set_prompt("");
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rl_replace_line("", 0);
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rl_redisplay();
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rl_set_prompt(last_prompt.c_str());
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}
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static int handle_enter(int x, int y)
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{
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std::lock_guard<std::mutex> lock(sync_mutex);
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char* line = NULL;
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line = rl_copy_text(0, rl_end);
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rl_set_prompt("");
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rl_replace_line("", 1);
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rl_redisplay();
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if (strcmp(line, "") != 0)
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{
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last_line = line;
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add_history(line);
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have_line.notify_one();
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}
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free(line);
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rl_set_prompt(last_prompt.c_str());
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rl_redisplay();
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rl_done = 1;
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return 0;
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}
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static int startup_hook()
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{
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rl_bind_key(RETURN, handle_enter);
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rl_bind_key(NEWLINE, handle_enter);
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return 0;
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}
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static void install_line_handler()
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{
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rl_startup_hook = startup_hook;
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rl_callback_handler_install("", handle_line);
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}
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static void remove_line_handler()
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{
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rl_unbind_key(RETURN);
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rl_callback_handler_remove();
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}
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