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#include "readline_buffer.h"
#include <readline/readline.h>
#include <readline/history.h>
#include <unistd.h>
#include <iostream>
#include <boost/thread.hpp>
#include <boost/algorithm/string.hpp>
static void install_line_handler();
static void remove_line_handler();
static boost::mutex sync_mutex;
static rdln::linestatus line_stat;
static char *the_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();
}
std::vector<std::string>& rdln::readline_buffer::completion_commands()
{
static std::vector<std::string> commands = {"exit"};
return commands;
}
rdln::readline_buffer::readline_buffer()
: std::stringbuf(), m_cout_buf(NULL), m_prompt_length(0)
{
current = this;
}
void rdln::readline_buffer::start()
{
if(m_cout_buf != NULL)
return;
m_cout_buf = std::cout.rdbuf();
std::cout.rdbuf(this);
install_line_handler();
}
void rdln::readline_buffer::stop()
{
if(m_cout_buf == NULL)
return;
std::cout.rdbuf(m_cout_buf);
m_cout_buf = NULL;
remove_line_handler();
}
rdln::linestatus rdln::readline_buffer::get_line(std::string& line) const
{
boost::lock_guard<boost::mutex> lock(sync_mutex);
line_stat = rdln::partial;
rl_callback_read_char();
if (line_stat == rdln::full)
{
line = the_line;
free(the_line);
the_line = NULL;
}
return line_stat;
}
void rdln::readline_buffer::set_prompt(const std::string& prompt)
{
if(m_cout_buf == NULL)
return;
boost::lock_guard<boost::mutex> lock(sync_mutex);
rl_set_prompt(std::string(m_prompt_length, ' ').c_str());
rl_redisplay();
rl_set_prompt(prompt.c_str());
rl_redisplay();
m_prompt_length = prompt.size();
}
void rdln::readline_buffer::add_completion(const std::string& command)
{
if(std::find(completion_commands().begin(), completion_commands().end(), command) != completion_commands().end())
return;
completion_commands().push_back(command);
}
const std::vector<std::string>& rdln::readline_buffer::get_completions()
{
return completion_commands();
}
int rdln::readline_buffer::sync()
{
boost::lock_guard<boost::mutex> lock(sync_mutex);
#if RL_READLINE_VERSION < 0x0700
char lbuf[2] = {0,0};
char *line = NULL;
int end = 0, point = 0;
#endif
if (rl_end || *rl_prompt)
{
#if RL_READLINE_VERSION >= 0x0700
rl_clear_visible_line();
#else
line = rl_line_buffer;
end = rl_end;
point = rl_point;
rl_line_buffer = lbuf;
rl_end = 0;
rl_point = 0;
rl_save_prompt();
rl_redisplay();
#endif
}
do
{
m_cout_buf->sputc( this->sgetc() );
}
while ( this->snextc() != EOF );
#if RL_READLINE_VERSION < 0x0700
if (end || *rl_prompt)
{
rl_restore_prompt();
rl_line_buffer = line;
rl_end = end;
rl_point = point;
}
#endif
rl_on_new_line();
rl_redisplay();
return 0;
}
static void handle_line(char* line)
{
bool exit = false;
if (line)
{
line_stat = rdln::full;
the_line = line;
std::string test_line = line;
boost::trim_right(test_line);
if(!test_line.empty())
{
add_history(test_line.c_str());
history_set_pos(history_length);
if (test_line == "exit" || test_line == "q")
exit = true;
}
} else
/* EOF */
{
line_stat = rdln::empty;
exit = true;
}
rl_done = 1;
if (exit)
rl_set_prompt("");
return;
}
static char* completion_matches(const char* text, int state)
{
static size_t list_index;
static size_t len;
if(state == 0)
{
list_index = 0;
len = strlen(text);
}
const std::vector<std::string>& completions = rdln::readline_buffer::get_completions();
for(; list_index<completions.size(); )
{
const std::string& cmd = completions[list_index++];
if(cmd.compare(0, len, text) == 0)
{
return strdup(cmd.c_str());
}
}
return NULL;
}
static char** attempted_completion(const char* text, int start, int end)
{
rl_attempted_completion_over = 1;
return rl_completion_matches(text, completion_matches);
}
static void install_line_handler()
{
rl_attempted_completion_function = attempted_completion;
rl_callback_handler_install("", handle_line);
stifle_history(500);
}
static void remove_line_handler()
{
rl_replace_line("", 0);
rl_set_prompt("");
rl_redisplay();
rl_callback_handler_remove();
}
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