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Annotation of embedaddon/readline/examples/hist_erasedups.c, revision 1.1.1.1

1.1       misho       1: /* hist_erasedups -- remove all duplicate entries from history file */
                      2: 
                      3: /* Copyright (C) 2011 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: #ifndef READLINE_LIBRARY
                     22: #define READLINE_LIBRARY 1
                     23: #endif
                     24: 
                     25: #include <unistd.h>
                     26: #include <stdlib.h>
                     27: #include <stdio.h>
                     28: 
                     29: #ifdef READLINE_LIBRARY
                     30: #  include "history.h"
                     31: #else
                     32: #  include <readline/history.h>
                     33: #endif
                     34: 
                     35: #include <string.h>
                     36: 
                     37: #define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
                     38: #define STREQN(a, b, n) ((n == 0) ? (1) \
                     39:                                   : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))
                     40: 
                     41: extern int history_offset;
                     42:                                   
                     43: static void
                     44: usage()
                     45: {
                     46:   fprintf (stderr, "hist_erasedups: usage: hist_erasedups [-t] [filename]\n");
                     47:   exit (2);
                     48: }
                     49: 
                     50: int
                     51: main (argc, argv)
                     52:      int argc;
                     53:      char **argv;
                     54: {
                     55:   char *fn;
                     56:   int r;
                     57: 
                     58:   while ((r = getopt (argc, argv, "t")) != -1)
                     59:     {
                     60:       switch (r)
                     61:        {
                     62:        case 't':
                     63:          history_write_timestamps = 1;
                     64:          break;
                     65:        default:
                     66:          usage ();
                     67:        }
                     68:     }
                     69:   argv += optind;
                     70:   argc -= optind;
                     71: 
                     72:   fn = argc ? argv[0] : getenv ("HISTFILE");
                     73:   if (fn == 0)
                     74:     {
                     75:       fprintf (stderr, "hist_erasedups: no history file\n");
                     76:       usage ();
                     77:     }
                     78: 
                     79:   if ((r = read_history (fn)) != 0)
                     80:     {
                     81:       fprintf (stderr, "hist_erasedups: read_history: %s: %s\n", fn, strerror (r));
                     82:       exit (1);
                     83:     }
                     84: 
                     85:   hist_erasedups ();
                     86: 
                     87:   if ((r = write_history (fn)) != 0)
                     88:     {
                     89:       fprintf (stderr, "hist_erasedups: write_history: %s: %s\n", fn, strerror (r));
                     90:       exit (1);
                     91:     }
                     92: 
                     93:   exit (0);
                     94: }
                     95: 
                     96: int
                     97: hist_erasedups ()
                     98: {
                     99:   int r, n;
                    100:   HIST_ENTRY *h, *temp;
                    101: 
                    102:   using_history ();
                    103:   while (h = previous_history ())
                    104:     {
                    105:       r = where_history ();
                    106:       for (n = 0; n < r; n++)
                    107:        {
                    108:          temp = history_get (n+history_base);
                    109:          if (STREQ (h->line, temp->line))
                    110:            {
                    111:              remove_history (n);
                    112:              r--;                      /* have to get one fewer now */
                    113:              n--;                      /* compensate for above increment */
                    114:              history_offset--;         /* moving backwards in history list */
                    115:            }
                    116:        }
                    117:     }
                    118:   using_history ();
                    119: 
                    120:   return r;
                    121: }