Home | History | Annotate | Line # | Download | only in examples 
      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 }
    129