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readline 8.1

    1: /* histexamp.c - history library example program. */
    2: 
    3: /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
    4: 
    5:    This file is part of the GNU Readline Library (Readline), a library for
    6:    reading lines of text with interactive input and history editing.
    7: 
    8:    Readline is free software: you can redistribute it and/or modify
    9:    it under the terms of the GNU General Public License as published by
   10:    the Free Software Foundation, either version 3 of the License, or
   11:    (at your option) any later version.
   12: 
   13:    Readline is distributed in the hope that it will be useful,
   14:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16:    GNU General Public License for more details.
   17: 
   18:    You should have received a copy of the GNU General Public License
   19:    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
   20: */
   21: 
   22: #include <stdio.h>
   23: 
   24: #ifdef READLINE_LIBRARY
   25: #  include "history.h"
   26: #else
   27: #  include <readline/history.h>
   28: #endif
   29: 
   30: #include <unistd.h>
   31: #include <stdlib.h>
   32: #include <string.h>
   33: 
   34: int
   35: main (argc, argv)
   36:      int argc;
   37:      char **argv;
   38: {
   39:   char line[1024], *t;
   40:   int len, done;
   41: 
   42:   line[0] = 0;
   43:   done = 0;
   44: 
   45:   using_history ();
   46:   while (!done)
   47:     {
   48:       printf ("history$ ");
   49:       fflush (stdout);
   50:       t = fgets (line, sizeof (line) - 1, stdin);
   51:       if (t && *t)
   52: 	{
   53: 	  len = strlen (t);
   54: 	  if (t[len - 1] == '\n')
   55: 	    t[len - 1] = '\0';
   56: 	}
   57: 
   58:       if (!t)
   59: 	strcpy (line, "quit");
   60: 
   61:       if (line[0])
   62: 	{
   63: 	  char *expansion;
   64: 	  int result;
   65: 
   66: 	  using_history ();
   67: 
   68: 	  result = history_expand (line, &expansion);
   69: 	  if (result)
   70: 	    fprintf (stderr, "%s\n", expansion);
   71: 
   72: 	  if (result < 0 || result == 2)
   73: 	    {
   74: 	      free (expansion);
   75: 	      continue;
   76: 	    }
   77: 
   78: 	  add_history (expansion);
   79: 	  strncpy (line, expansion, sizeof (line) - 1);
   80: 	  free (expansion);
   81: 	}
   82: 
   83:       if (strcmp (line, "quit") == 0)
   84: 	done = 1;
   85:       else if (strcmp (line, "save") == 0)
   86: 	write_history ("history_file");
   87:       else if (strcmp (line, "read") == 0)
   88: 	read_history ("history_file");
   89:       else if (strcmp (line, "list") == 0)
   90: 	{
   91: 	  register HIST_ENTRY **the_list;
   92: 	  register int i;
   93: 	  time_t tt;
   94: 	  char timestr[128];
   95: 
   96: 	  the_list = history_list ();
   97: 	  if (the_list)
   98: 	    for (i = 0; the_list[i]; i++)
   99: 	      {
  100: 	      	tt = history_get_time (the_list[i]);
  101: 		if (tt)
  102: 		  strftime (timestr, sizeof (timestr), "%a %R", localtime(&tt));
  103: 		else
  104: 		  strcpy (timestr, "??");
  105: 	        printf ("%d: %s: %s\n", i + history_base, timestr, the_list[i]->line);
  106: 	      }
  107: 	}
  108:       else if (strncmp (line, "delete", 6) == 0)
  109: 	{
  110: 	  int which;
  111: 	  if ((sscanf (line + 6, "%d", &which)) == 1)
  112: 	    {
  113: 	      HIST_ENTRY *entry = remove_history (which);
  114: 	      if (!entry)
  115: 		fprintf (stderr, "No such entry %d\n", which);
  116: 	      else
  117: 		{
  118: 		  free (entry->line);
  119: 		  free (entry);
  120: 		}
  121: 	    }
  122: 	  else
  123: 	    {
  124: 	      fprintf (stderr, "non-numeric arg given to `delete'\n");
  125: 	    }
  126: 	}
  127:     }
  128: }