demo.c

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/*
 * Copyright (c) 2000, 2001 by the California Institute of Technology.
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons
 * to whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
 * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * Except as contained in this notice, the name of a copyright holder
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * of the copyright holder.
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <locale.h>

#include <unistd.h>
#include <sys/stat.h>

#include "libtecla.h"

int main(int argc, char *argv[])
{
  char *line;             /* A line of input */
  GetLine *gl;            /* The line editor */
  int major,minor,micro;  /* The version number of the library */
/*
 * Create the line editor, specifying a max line length of 500 bytes,
 * and 10000 bytes to allocate to storage of historical input lines.
 */
  gl = new_GetLine(500, 5000);
  if(!gl)
    return 1;
/*
 * If the user has the LC_CTYPE or LC_ALL environment variables set,
 * enable display of characters corresponding to the specified locale.
 */
  (void) setlocale(LC_CTYPE, "");
/*
 * Lookup and display the version number of the library.
 */
  libtecla_version(&major, &minor, &micro);
  printf("Welcome to the demo program of libtecla version %d.%d.%d\n",
	 major, minor, micro);
/*
 * Load history.
 */
  (void) gl_load_history(gl, "~/.demo_history", "#");
/*
 * Read lines of input from the user and print them to stdout.
 */
  do {
/*
 * Get a new line from the user.
 */
    line = gl_get_line(gl, "$ ", NULL, 0);
    if(!line)
      break;
/*
 * Display what was entered.
 */
    if(printf("You entered: %s", line) < 0 || fflush(stdout))
      break;
/*
 * If the user types "exit", quit the program.
 */
    if(strcmp(line, "exit\n")==0)
      break;
    else if(strcmp(line, "history\n")==0)
      gl_show_history(gl, stdout, "%N  %T   %H\n", 0, -1);
    else if(strcmp(line, "size\n")==0) {
      GlTerminalSize size = gl_terminal_size(gl, 80, 24);
      printf("Terminal size = %d columns x %d lines.\n", size.ncolumn,
	     size.nline);
    };
  } while(1);
/*
 * Save historical command lines.
 */
  (void) gl_save_history(gl, "~/.demo_history", "#", -1);
/*
 * Clean up.
 */
  gl = del_GetLine(gl);
  return 0;
}