value);
}
+/* Variable associated with the "history remove-duplicates" option.
+ The value -1 means unlimited. */
+static int history_remove_duplicates = 0;
+
+static void
+show_history_remove_duplicates (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file,
+ _("The number of history entries to look back at for "
+ "duplicates is %s.\n"),
+ value);
+}
+
static char *history_filename;
static void
show_history_filename (struct ui_file *file, int from_tty,
void
gdb_add_history (const char *command)
{
- add_history (command);
command_count++;
+
+ if (history_remove_duplicates != 0)
+ {
+ int lookbehind;
+ int lookbehind_threshold;
+
+ /* The lookbehind threshold for finding a duplicate history entry is
+ bounded by command_count because we can't meaningfully delete
+ history entries that are already stored in the history file since
+ the history file is appended to. */
+ if (history_remove_duplicates == -1
+ || history_remove_duplicates > command_count)
+ lookbehind_threshold = command_count;
+ else
+ lookbehind_threshold = history_remove_duplicates;
+
+ using_history ();
+ for (lookbehind = 0; lookbehind < lookbehind_threshold; lookbehind++)
+ {
+ HIST_ENTRY *temp = previous_history ();
+
+ if (temp == NULL)
+ break;
+
+ if (strcmp (temp->line, command) == 0)
+ {
+ HIST_ENTRY *prev = remove_history (where_history ());
+ command_count--;
+ free_history_entry (prev);
+ break;
+ }
+ }
+ using_history ();
+ }
+
+ add_history (command);
}
/* Safely append new history entries to the history file in a corruption-free
else
{
append_history (command_count, local_history_filename);
- history_truncate_file (local_history_filename, history_max_entries);
+ if (history_is_stifled ())
+ history_truncate_file (local_history_filename, history_max_entries);
}
ret = rename (local_history_filename, history_filename);
{
char *tmpenv;
- tmpenv = getenv ("HISTSIZE");
+ tmpenv = getenv ("GDBHISTSIZE");
if (tmpenv)
{
- int var;
-
- var = atoi (tmpenv);
- if (var < 0)
- {
- /* Prefer ending up with no history rather than overflowing
- readline's history interface, which uses signed 'int'
- everywhere. */
- var = 0;
- }
+ long var;
+ int saved_errno;
+ char *endptr;
- history_size_setshow_var = var;
+ tmpenv = skip_spaces (tmpenv);
+ errno = 0;
+ var = strtol (tmpenv, &endptr, 10);
+ saved_errno = errno;
+ endptr = skip_spaces (endptr);
+
+ /* If GDBHISTSIZE is non-numeric then ignore it. If GDBHISTSIZE is the
+ empty string, a negative number or a huge positive number (larger than
+ INT_MAX) then set the history size to unlimited. Otherwise set our
+ history size to the number we have read. This behavior is consistent
+ with how bash handles HISTSIZE. */
+ if (*endptr != '\0')
+ ;
+ else if (*tmpenv == '\0'
+ || var < 0
+ || var > INT_MAX
+ /* On targets where INT_MAX == LONG_MAX, we have to look at
+ errno after calling strtol to distinguish between a value that
+ is exactly INT_MAX and an overflowing value that was clamped
+ to INT_MAX. */
+ || (var == INT_MAX && saved_errno == ERANGE))
+ history_size_setshow_var = -1;
+ else
+ history_size_setshow_var = var;
}
- /* If the init file hasn't set a size yet, pick the default. */
- else if (history_size_setshow_var == -2)
+
+ /* If neither the init file nor GDBHISTSIZE has set a size yet, pick the
+ default. */
+ if (history_size_setshow_var == -2)
history_size_setshow_var = 256;
set_readline_history_size (history_size_setshow_var);
ie. the number of previous commands to keep a record of.\n\
If set to \"unlimited\", the number of commands kept in the history\n\
list is unlimited. This defaults to the value of the environment\n\
-variable \"HISTSIZE\", or to 256 if this variable is not set."),
+variable \"GDBHISTSIZE\", or to 256 if this variable is not set."),
set_history_size_command,
show_history_size,
&sethistlist, &showhistlist);
+ add_setshow_zuinteger_unlimited_cmd ("remove-duplicates", no_class,
+ &history_remove_duplicates, _("\
+Set how far back in history to look for and remove duplicate entries."), _("\
+Show how far back in history to look for and remove duplicate entries."), _("\
+If set to a nonzero value N, GDB will look back at the last N history entries\n\
+and remove the first history entry that is a duplicate of the most recent\n\
+entry, each time a new history entry is added.\n\
+If set to \"unlimited\", this lookbehind is unbounded.\n\
+Only history entries added during this session are considered for removal.\n\
+If set to 0, removal of duplicate history entries is disabled.\n\
+By default this option is set to 0."),
+ NULL,
+ show_history_remove_duplicates,
+ &sethistlist, &showhistlist);
+
add_setshow_filename_cmd ("filename", no_class, &history_filename, _("\
Set the filename in which to record the command history"), _("\
Show the filename in which to record the command history"), _("\
projects / deliverable / binutils-gdb.git / blobdiff