1 files changed, 151 insertions, 0 deletions
diff --git a/examples/hist_purgecmd.c b/examples/hist_purgecmd.c
new file mode 100644
index 0000000..7992d81
--- /dev/null
+++ b/examples/hist_purgecmd.c
@@ -0,0 +1,151 @@
+/* hist_purgecmd -- remove all instances of command or pattern 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>
+
+#include <regex.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))
+
+#define PURGE_REGEXP	0x01
+
+int hist_purgecmd (char *, int);
+
+static void
+usage()
+{
+  fprintf (stderr, "hist_purgecmd: usage: hist_purgecmd [-r] [-t] [-f filename] command-spec\n");
+  exit (2);
+}
+
+int
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  char *fn;
+  int r, flags;
+
+  flags = 0;
+  fn = 0;
+  while ((r = getopt (argc, argv, "f:rt")) != -1)
+    {
+      switch (r)
+	{
+	case 'f':
+	  fn = optarg;
+	  break;
+	case 'r':
+	  flags |= PURGE_REGEXP;
+	  break;
+	case 't':
+	  history_write_timestamps = 1;
+	  break;
+	default:
+	  usage ();
+	}
+    }
+  argv += optind;
+  argc -= optind;
+
+  if (fn == 0)
+    fn = getenv ("HISTFILE");
+  if (fn == 0)
+    {
+      fprintf (stderr, "hist_purgecmd: no history file\n");
+      usage ();
+    }
+
+  if ((r = read_history (fn)) != 0)
+    {
+      fprintf (stderr, "hist_purgecmd: read_history: %s: %s\n", fn, strerror (r));
+      exit (1);
+    }
+
+  for (r = 0; r < argc; r++)
+    hist_purgecmd (argv[r], flags);
+
+  if ((r = write_history (fn)) != 0)
+    {
+      fprintf (stderr, "hist_purgecmd: write_history: %s: %s\n", fn, strerror (r));
+      exit (1);
+    }
+
+  exit (0);
+}
+
+int
+hist_purgecmd (cmd, flags)
+     char *cmd;
+     int flags;
+{
+  int r, n, rflags;
+  HIST_ENTRY *temp;
+  regex_t regex = { 0 };
+
+  if (flags & PURGE_REGEXP)
+    {
+      rflags = REG_EXTENDED|REG_NOSUB;
+      if (regcomp (&regex, cmd, rflags))
+	{
+	  fprintf (stderr, "hist_purgecmd: %s: invalid regular expression\n", cmd);
+	  return -1;
+	}
+    }
+
+  r = 0;
+  using_history ();
+  r = where_history ();
+  for (n = 0; n < r; n++)
+    {
+      temp = history_get (n+history_base);
+      if (((flags & PURGE_REGEXP) && (regexec (&regex, temp->line, 0, 0, 0) == 0)) ||
+	  ((flags & PURGE_REGEXP) == 0 && STREQ (temp->line, cmd)))
+	{
+	  remove_history (n);
+	  r--;			/* have to get one fewer now */
+	  n--;			/* compensate for above increment */
+	  history_offset--;	/* moving backwards in history list */
+	}
+    }
+  using_history ();
+
+  if (flags & PURGE_REGEXP)
+    regfree (&regex);
+
+  return r;
+}