readline/examples/histexamp.c

   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 <string.h>
  31
  32 main (argc, argv)
  33      int argc;
  34      char **argv;
  35 {
  36   char line[1024], *t;
  37   int len, done;
  38
  39   line[0] = 0;
  40   done = 0;
  41
  42   using_history ();
  43   while (!done)
  44     {
  45       printf ("history$ ");
  46       fflush (stdout);
  47       t = fgets (line, sizeof (line) - 1, stdin);
  48       if (t && *t)
  49         {
  50           len = strlen (t);
  51           if (t[len - 1] == '\n')
  52             t[len - 1] = '\0';
  53         }
  54
  55       if (!t)
  56         strcpy (line, "quit");
  57
  58       if (line[0])
  59         {
  60           char *expansion;
  61           int result;
  62
  63           using_history ();
  64
  65           result = history_expand (line, &expansion);
  66           if (result)
  67             fprintf (stderr, "%s\n", expansion);
  68
  69           if (result < 0 || result == 2)
  70             {
  71               free (expansion);
  72               continue;
  73             }
  74
  75           add_history (expansion);
  76           strncpy (line, expansion, sizeof (line) - 1);
  77           free (expansion);
  78         }
  79
  80       if (strcmp (line, "quit") == 0)
  81         done = 1;
  82       else if (strcmp (line, "save") == 0)
  83         write_history ("history_file");
  84       else if (strcmp (line, "read") == 0)
  85         read_history ("history_file");
  86       else if (strcmp (line, "list") == 0)
  87         {
  88           register HIST_ENTRY **the_list;
  89           register int i;
  90           time_t tt;
  91           char timestr[128];
  92
  93           the_list = history_list ();
  94           if (the_list)
  95             for (i = 0; the_list[i]; i++)
  96               {
  97                 tt = history_get_time (the_list[i]);
  98                 if (tt)
  99                   strftime (timestr, sizeof (timestr), "%a %R", localtime(&tt));
 100                 else
 101                   strcpy (timestr, "??");
 102                 printf ("%d: %s: %s\n", i + history_base, timestr, the_list[i]->line);
 103               }
 104         }
 105       else if (strncmp (line, "delete", 6) == 0)
 106         {
 107           int which;
 108           if ((sscanf (line + 6, "%d", &which)) == 1)
 109             {
 110               HIST_ENTRY *entry = remove_history (which);
 111               if (!entry)
 112                 fprintf (stderr, "No such entry %d\n", which);
 113               else
 114                 {
 115                   free (entry->line);
 116                   free (entry);
 117                 }
 118             }
 119           else
 120             {
 121               fprintf (stderr, "non-numeric arg given to `delete'\n");
 122             }
 123         }
 124     }
 125 }