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-rw-r--r--examples/hist_erasedups.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/examples/hist_erasedups.c b/examples/hist_erasedups.c
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+++ b/examples/hist_erasedups.c
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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))
+
+int hist_erasedups (void);
+
+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;
+}