/* pick -- interactively select arguments to be echoed
   Copyright (C) 1990-1999 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <config.h>
#include <errno.h>
#include <stdio.h>

#include "error.h"
#include "long-options.h"
#include "readtokens.h"
#include "system.h"

#define PROGRAM_NAME "pick"
#define AUTHORS "Leonard Stiles"

#define DELIM "\n"

#define RESPFNAME "/dev/tty" /* whence to read user response */

char *program_name;

void
usage (int status)
{
  if (status != 0)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s ARGUMENT...\n\
  or:  %s OPTION\n\
"),
	      program_name, program_name);
      printf (_("\
Interactively select arguments to be echoed\n\
\n\
  --help      display this help and exit\n\
  --version   output version information and exit\n\
\n\
For each ARGUMENT, prompt whether it should be echoed to the standard\n\
output; if the only argument is `-', read from the standard input.\n\
"));
      puts (_("\nReport bugs to <address@hidden>."));
    }
  exit (status);
}

void
pick (FILE* fp, char *s)
{
  int c;
  fprintf (stderr, "%s? ", s);
  while ((c = fgetc (fp)) == ' ')
    ;
  if (c == 'y') puts (s);
  else if (c == 'q' || c == EOF) exit (0);
  while (c != '\n')
    c = fgetc (fp);
}

int
main (int argc, char **argv)
{
  FILE *ttyf;

  program_name = *argv;
  
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
		      AUTHORS, usage);
  /* The above handles --help and --version.
     Since there is no other invocation of getopt, handle `--' here.  */
  if (argc > 1 && STREQ (argv[1], "--"))
    {
      --argc;
      ++argv;
    }

  if ((ttyf = fopen (RESPFNAME, "r")) == NULL)
      error (2, errno, _("error opening %s"), RESPFNAME);

  if (argc == 2 && STREQ (argv[1], "-"))
    {
      token_buffer tbuf;

      init_tokenbuffer (&tbuf);

      while (readtoken (stdin, DELIM, sizeof (DELIM) - 1, &tbuf) >= 0)
	pick (ttyf, tbuf.buffer);

      free (tbuf.buffer);
    }
  else
      while (--argc)
	pick (ttyf, *++argv);
  
  if (fclose (ttyf) != 0)
    error (2, errno, _("error closing %s"), RESPFNAME);

  return 0;
}