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/* hist_erasedups -- remove all duplicate entries from history file */
/* Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU Readline Library (Readline), a library for
reading lines of text with interactive input and history editing.
Readline 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 3 of the License, or
(at your option) any later version.
Readline 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 Readline. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef READLINE_LIBRARY
#define READLINE_LIBRARY 1
#endif
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef READLINE_LIBRARY
# include "history.h"
#else
# include <readline/history.h>
#endif
#include <string.h>
#define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
#define STREQN(a, b, n) ((n == 0) ? (1) \
: ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))
extern int history_offset;
static void
usage()
{
fprintf (stderr, "hist_erasedups: usage: hist_erasedups [-t] [filename]\n");
exit (2);
}
int
main (argc, argv)
int argc;
char **argv;
{
char *fn;
int r;
while ((r = getopt (argc, argv, "t")) != -1)
{
switch (r)
{
case 't':
history_write_timestamps = 1;
break;
default:
usage ();
}
}
argv += optind;
argc -= optind;
fn = argc ? argv[0] : getenv ("HISTFILE");
if (fn == 0)
{
fprintf (stderr, "hist_erasedups: no history file\n");
usage ();
}
if ((r = read_history (fn)) != 0)
{
fprintf (stderr, "hist_erasedups: read_history: %s: %s\n", fn, strerror (r));
exit (1);
}
hist_erasedups ();
if ((r = write_history (fn)) != 0)
{
fprintf (stderr, "hist_erasedups: write_history: %s: %s\n", fn, strerror (r));
exit (1);
}
exit (0);
}
int
hist_erasedups ()
{
int r, n;
HIST_ENTRY *h, *temp;
using_history ();
while (h = previous_history ())
{
r = where_history ();
for (n = 0; n < r; n++)
{
temp = history_get (n+history_base);
if (STREQ (h->line, temp->line))
{
remove_history (n);
r--; /* have to get one fewer now */
n--; /* compensate for above increment */
history_offset--; /* moving backwards in history list */
}
}
}
using_history ();
return r;
}
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