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- /* History.h -- the names of functions that you can call in history. */
- /* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
-
- This file contains the GNU History Library (the Library), a set of
- routines for managing the text of previously typed lines.
-
- The Library 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 2, or (at your option)
- any later version.
-
- The Library 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.
-
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
-
- #ifndef _HISTORY_H_
- #define _HISTORY_H_
-
- #if __READLINE_EXPORT__
- # define READLINE_API __declspec (dllexport)
- #elif __READLINE_IMPORT__
- # define READLINE_API __declspec (dllimport)
- #else
- # define READLINE_API
- #endif
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- #if defined READLINE_LIBRARY
- # include "rlstdc.h"
- # include "rltypedefs.h"
- #else
- # include <readline/rlstdc.h>
- # include <readline/rltypedefs.h>
- #endif
-
- #ifdef __STDC__
- typedef void *histdata_t;
- #else
- typedef char *histdata_t;
- #endif
-
- /* The structure used to store a history entry. */
- typedef struct _hist_entry {
- char *line;
- histdata_t data;
- } HIST_ENTRY;
-
- /* A structure used to pass the current state of the history stuff around. */
- typedef struct _hist_state {
- HIST_ENTRY **entries; /* Pointer to the entries themselves. */
- int offset; /* The location pointer within this array. */
- int length; /* Number of elements within this array. */
- int size; /* Number of slots allocated to this array. */
- int flags;
- } HISTORY_STATE;
-
- /* Flag values for the `flags' member of HISTORY_STATE. */
- #define HS_STIFLED 0x01
-
- /* Initialization and state management. */
-
- /* Begin a session in which the history functions might be used. This
- just initializes the interactive variables. */
- READLINE_API extern void using_history __P((void));
-
- /* Return the current HISTORY_STATE of the history. */
- READLINE_API extern HISTORY_STATE *history_get_history_state __P((void));
-
- /* Set the state of the current history array to STATE. */
- READLINE_API extern void history_set_history_state __P((HISTORY_STATE *));
-
- /* Manage the history list. */
-
- /* Place STRING at the end of the history list.
- The associated data field (if any) is set to NULL. */
- READLINE_API extern void add_history __P((const char *));
-
- /* A reasonably useless function, only here for completeness. WHICH
- is the magic number that tells us which element to delete. The
- elements are numbered from 0. */
- READLINE_API extern HIST_ENTRY *remove_history __P((int));
-
- /* Make the history entry at WHICH have LINE and DATA. This returns
- the old entry so you can dispose of the data. In the case of an
- invalid WHICH, a NULL pointer is returned. */
- READLINE_API extern HIST_ENTRY *replace_history_entry __P((int, const char *, histdata_t));
-
- /* Clear the history list and start over. */
- READLINE_API extern void clear_history __P((void));
-
- /* Stifle the history list, remembering only MAX number of entries. */
- READLINE_API extern void stifle_history __P((int));
-
- /* Stop stifling the history. This returns the previous amount the
- history was stifled by. The value is positive if the history was
- stifled, negative if it wasn't. */
- READLINE_API extern int unstifle_history __P((void));
-
- /* Return 1 if the history is stifled, 0 if it is not. */
- READLINE_API extern int history_is_stifled __P((void));
-
- /* Information about the history list. */
-
- /* Return a NULL terminated array of HIST_ENTRY which is the current input
- history. Element 0 of this list is the beginning of time. If there
- is no history, return NULL. */
- READLINE_API extern HIST_ENTRY **history_list __P((void));
-
- /* Returns the number which says what history element we are now
- looking at. */
- READLINE_API extern int where_history __P((void));
-
- /* Return the history entry at the current position, as determined by
- history_offset. If there is no entry there, return a NULL pointer. */
- READLINE_API extern HIST_ENTRY *current_history __P((void));
-
- /* Return the history entry which is logically at OFFSET in the history
- array. OFFSET is relative to history_base. */
- READLINE_API extern HIST_ENTRY *history_get __P((int));
-
- /* Return the number of bytes that the primary history entries are using.
- This just adds up the lengths of the_history->lines. */
- READLINE_API extern int history_total_bytes __P((void));
-
- /* Moving around the history list. */
-
- /* Set the position in the history list to POS. */
- READLINE_API extern int history_set_pos __P((int));
-
- /* Back up history_offset to the previous history entry, and return
- a pointer to that entry. If there is no previous entry, return
- a NULL pointer. */
- READLINE_API extern HIST_ENTRY *previous_history __P((void));
-
- /* Move history_offset forward to the next item in the input_history,
- and return the a pointer to that entry. If there is no next entry,
- return a NULL pointer. */
- READLINE_API extern HIST_ENTRY *next_history __P((void));
-
- /* Searching the history list. */
-
- /* Search the history for STRING, starting at history_offset.
- If DIRECTION < 0, then the search is through previous entries,
- else through subsequent. If the string is found, then
- current_history () is the history entry, and the value of this function
- is the offset in the line of that history entry that the string was
- found in. Otherwise, nothing is changed, and a -1 is returned. */
- READLINE_API extern int history_search __P((const char *, int));
-
- /* Search the history for STRING, starting at history_offset.
- The search is anchored: matching lines must begin with string.
- DIRECTION is as in history_search(). */
- READLINE_API extern int history_search_prefix __P((const char *, int));
-
- /* Search for STRING in the history list, starting at POS, an
- absolute index into the list. DIR, if negative, says to search
- backwards from POS, else forwards.
- Returns the absolute index of the history element where STRING
- was found, or -1 otherwise. */
- READLINE_API extern int history_search_pos __P((const char *, int, int));
-
- /* Managing the history file. */
-
- /* Add the contents of FILENAME to the history list, a line at a time.
- If FILENAME is NULL, then read from ~/.history. Returns 0 if
- successful, or errno if not. */
- READLINE_API extern int read_history __P((const char *));
-
- /* Read a range of lines from FILENAME, adding them to the history list.
- Start reading at the FROM'th line and end at the TO'th. If FROM
- is zero, start at the beginning. If TO is less than FROM, read
- until the end of the file. If FILENAME is NULL, then read from
- ~/.history. Returns 0 if successful, or errno if not. */
- READLINE_API extern int read_history_range __P((const char *, int, int));
-
- /* Write the current history to FILENAME. If FILENAME is NULL,
- then write the history list to ~/.history. Values returned
- are as in read_history (). */
- READLINE_API extern int write_history __P((const char *));
-
- /* Append NELEMENT entries to FILENAME. The entries appended are from
- the end of the list minus NELEMENTs up to the end of the list. */
- READLINE_API extern int append_history __P((int, const char *));
-
- /* Truncate the history file, leaving only the last NLINES lines. */
- READLINE_API extern int history_truncate_file __P((const char *, int));
-
- /* History expansion. */
-
- /* Expand the string STRING, placing the result into OUTPUT, a pointer
- to a string. Returns:
-
- 0) If no expansions took place (or, if the only change in
- the text was the de-slashifying of the history expansion
- character)
- 1) If expansions did take place
- -1) If there was an error in expansion.
- 2) If the returned line should just be printed.
-
- If an error ocurred in expansion, then OUTPUT contains a descriptive
- error message. */
- READLINE_API extern int history_expand __P((char *, char **));
-
- /* Extract a string segment consisting of the FIRST through LAST
- arguments present in STRING. Arguments are broken up as in
- the shell. */
- READLINE_API extern char *history_arg_extract __P((int, int, const char *));
-
- /* Return the text of the history event beginning at the current
- offset into STRING. Pass STRING with *INDEX equal to the
- history_expansion_char that begins this specification.
- DELIMITING_QUOTE is a character that is allowed to end the string
- specification for what to search for in addition to the normal
- characters `:', ` ', `\t', `\n', and sometimes `?'. */
- READLINE_API extern char *get_history_event __P((const char *, int *, int));
-
- /* Return an array of tokens, much as the shell might. The tokens are
- parsed out of STRING. */
- READLINE_API extern char **history_tokenize __P((const char *));
-
- /* Exported history variables. */
- READLINE_API extern int history_base;
- READLINE_API extern int history_length;
- READLINE_API extern int history_max_entries;
- READLINE_API extern char history_expansion_char;
- READLINE_API extern char history_subst_char;
- READLINE_API extern char *history_word_delimiters;
- READLINE_API extern char history_comment_char;
- READLINE_API extern char *history_no_expand_chars;
- READLINE_API extern char *history_search_delimiter_chars;
- READLINE_API extern int history_quotes_inhibit_expansion;
-
- /* Backwards compatibility */
- READLINE_API extern int max_input_history;
-
- /* If set, this function is called to decide whether or not a particular
- history expansion should be treated as a special case for the calling
- application and not expanded. */
- READLINE_API extern rl_linebuf_func_t *history_inhibit_expansion_function;
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* !_HISTORY_H_ */
-