console.cc

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/*---------------------------------------------------------------------\
|                          ____ _   __ __ ___                          |
|                         |__  / \ / / . \ . \                         |
|                           / / \ V /|  _/  _/                         |
|                          / /__ | | | | | |                           |
|                         /_____||_| |_| |_|                           |
|                                                                      |
----------------------------------------------------------------------*/

#include <unistd.h>
#include <cstdlib>

#include <fstream>
#include <iostream>
#include <readline/readline.h>
#include <readline/history.h>

namespace ztui {

// ----------------------------------------------------------------------------

// Read a string. "\004" (^D) on EOF.
std::string readline_getline( std::string prompt_r )
{
  std::string ret;

  //::rl_catch_signals = 0;
  /* Get a line from the user. */
  if ( char * line_read = ::readline( prompt_r.c_str() ) )
  {
    ret = line_read;
    /* If the line has any text in it, save it on the history. */
    if ( *line_read )
      ::add_history( line_read );
    ::free( line_read );
  }
  else
    ret = "\004";

  return ret;
}

// ----------------------------------------------------------------------------

unsigned get_screen_width()
{
  if ( !::isatty(STDOUT_FILENO) )
    return -1; // no clipping

  int width = 80;

  const char *cols_env = getenv("COLUMNS");
  if ( cols_env )
    width  = ::atoi( cols_env );
  else
  {
    ::rl_initialize();
    //::rl_reset_screen_size();
    ::rl_get_screen_size( NULL, &width );
  }

  // safe default
  if ( !width )
    width = 80;

  return width;
}

// ----------------------------------------------------------------------------

void clear_keyboard_buffer()
{
  // note: this will not clear characters typed after the last \n
  std::ifstream stm( "/dev/tty" );
  char s[8];
  while (stm.good() && stm.readsome(s, 8));
}

}