/*
  cc -g test.c -o test -ledit -ltermcap
*/

/* This will include all our libedit functions.  If you use C++ don't
forget to use the C++ extern "C" to get it to compile.
*/
#include <editline/readline.h>
#include "picrin.h"
#include "picrin/pair.h"
#include "picrin/string.h"
#include "picrin/port.h"


static pic_value
pic_rl_readline(pic_state *pic)
{
  char *prompt, *result;
  
  pic_get_args(pic, "z", &prompt);

  result = readline(prompt);

  if(result)
    return pic_obj_value(pic_str_new_cstr(pic, result));
  else
    return pic_eof_object();
}

static pic_value
pic_rl_add_history(pic_state *pic)
{
  char *line;

  pic_get_args(pic, "z", &line);

  add_history(line);

  return pic_undef_value();
}

static pic_value
pic_rl_stifle_history(pic_state *pic)
{
  int  i;
  
  pic_get_args(pic, "i", &i);

  stifle_history(i);

  return pic_undef_value();
}

static pic_value
pic_rl_unstifle_history(pic_state *pic)
{
  pic_get_args(pic, "");

  unstifle_history();
  
  return pic_undef_value();
}

static pic_value
pic_rl_history_is_stifled(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_bool_value(history_is_stifled());
}

static pic_value
pic_rl_history_length(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_int_value(history_length);
}

static pic_value
pic_rl_where_history(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_int_value(where_history());  
}

static pic_value
pic_rl_history_get(pic_state *pic)
{
  int i;
  HIST_ENTRY *e;

  pic_get_args(pic, "i", &i);
  
  e = history_get(i);
  if(!e)
    pic_errorf(pic, "failed to get entry");

  return pic_obj_value(pic_str_new_cstr(pic, e->line));
}

static pic_value
pic_rl_clear_history(pic_state *pic)
{
  pic_get_args(pic, "");

  clear_history();

  return pic_undef_value();
}

static pic_value
pic_rl_remove_history(pic_state *pic)
{
  int i;

  pic_get_args(pic, "i", &i);

  remove_history(i);
  
  return pic_undef_value();
}

static pic_value
pic_rl_read_history(pic_state *pic)
{
  char *filename;

  pic_get_args(pic, "z", &filename);

  if(read_history(filename))
    pic_errorf(pic, "cannot read history file :%s", filename);
  
  return pic_undef_value();
}

static pic_value
pic_rl_write_history(pic_state *pic)
{
  char *filename;

  pic_get_args(pic, "z", &filename);

  if(write_history(filename))
    pic_errorf(pic, "cannot write history file:%s", filename);
  
  return pic_undef_value();
}

static pic_value
pic_rl_truncate_file(pic_state *pic)
{
  char *filename;
  int i;

  pic_get_args(pic, "zi", &filename, &i);

  history_truncate_file(filename, i);
  
  return pic_undef_value();
}

void
pic_init_readline(pic_state *pic){
  using_history();
  pic_deflibrary (pic, "(picrin readline)") {
    pic_defun(pic, "readline", pic_rl_readline);
  }
  pic_deflibrary (pic, "(picrin readline history)") {
    pic_defun(pic, "add-history", pic_rl_add_history);
    pic_defun(pic, "stifle-history", pic_rl_stifle_history);
    pic_defun(pic, "unstifle-history", pic_rl_unstifle_history);
    pic_defun(pic, "history-stifled?", pic_rl_history_is_stifled);
    pic_defun(pic, "history-length", pic_rl_history_length);
    pic_defun(pic, "where-history", pic_rl_where_history);
    pic_defun(pic, "history-get", pic_rl_history_get);
    pic_defun(pic, "clear-history", pic_rl_clear_history);
    pic_defun(pic, "remove-history", pic_rl_remove_history);
    pic_defun(pic, "read-history", pic_rl_read_history);
    pic_defun(pic, "write-history", pic_rl_write_history);
    pic_defun(pic, "truncate-file", pic_rl_truncate_file);
  }
}