211 lines
7.7 KiB
C
211 lines
7.7 KiB
C
/* History.h -- the names of functions that you can call in history. */
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/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
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This file contains the GNU History Library (the Library), a set of
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routines for managing the text of previously typed lines.
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The Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef _HISTORY_H_
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#define _HISTORY_H_
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/* The structure used to store a history entry. */
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typedef struct _hist_entry {
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char *line;
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char *data;
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} HIST_ENTRY;
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/* A structure used to pass the current state of the history stuff around. */
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typedef struct _hist_state {
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HIST_ENTRY **entries; /* Pointer to the entries themselves. */
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int offset; /* The location pointer within this array. */
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int length; /* Number of elements within this array. */
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int size; /* Number of slots allocated to this array. */
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int flags;
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} HISTORY_STATE;
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/* Flag values for the `flags' member of HISTORY_STATE. */
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#define HS_STIFLED 0x01
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/* Initialization and state management. */
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/* Begin a session in which the history functions might be used. This
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just initializes the interactive variables. */
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extern void using_history ();
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/* Return the current HISTORY_STATE of the history. */
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extern HISTORY_STATE *history_get_history_state ();
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/* Set the state of the current history array to STATE. */
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extern void history_set_history_state ();
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/* Manage the history list. */
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/* Place STRING at the end of the history list.
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The associated data field (if any) is set to NULL. */
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extern void add_history ();
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/* A reasonably useless function, only here for completeness. WHICH
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is the magic number that tells us which element to delete. The
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elements are numbered from 0. */
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extern HIST_ENTRY *remove_history ();
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/* Make the history entry at WHICH have LINE and DATA. This returns
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the old entry so you can dispose of the data. In the case of an
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invalid WHICH, a NULL pointer is returned. */
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extern HIST_ENTRY *replace_history_entry ();
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/* Clear the history list and start over. */
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extern void clear_history ();
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/* Stifle the history list, remembering only MAX number of entries. */
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extern void stifle_history ();
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/* Stop stifling the history. This returns the previous amount the
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history was stifled by. The value is positive if the history was
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stifled, negative if it wasn't. */
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extern int unstifle_history ();
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/* Return 1 if the history is stifled, 0 if it is not. */
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extern int history_is_stifled ();
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/* Information about the history list. */
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/* Return a NULL terminated array of HIST_ENTRY which is the current input
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history. Element 0 of this list is the beginning of time. If there
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is no history, return NULL. */
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extern HIST_ENTRY **history_list ();
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/* Returns the number which says what history element we are now
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looking at. */
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extern int where_history ();
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/* Return the history entry at the current position, as determined by
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history_offset. If there is no entry there, return a NULL pointer. */
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HIST_ENTRY *current_history ();
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/* Return the history entry which is logically at OFFSET in the history
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array. OFFSET is relative to history_base. */
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extern HIST_ENTRY *history_get ();
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/* Return the number of bytes that the primary history entries are using.
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This just adds up the lengths of the_history->lines. */
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extern int history_total_bytes ();
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/* Moving around the history list. */
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/* Set the position in the history list to POS. */
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int history_set_pos ();
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/* Back up history_offset to the previous history entry, and return
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a pointer to that entry. If there is no previous entry, return
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a NULL pointer. */
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extern HIST_ENTRY *previous_history ();
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/* Move history_offset forward to the next item in the input_history,
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and return the a pointer to that entry. If there is no next entry,
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return a NULL pointer. */
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extern HIST_ENTRY *next_history ();
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/* Searching the history list. */
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/* Search the history for STRING, starting at history_offset.
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If DIRECTION < 0, then the search is through previous entries,
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else through subsequent. If the string is found, then
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current_history () is the history entry, and the value of this function
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is the offset in the line of that history entry that the string was
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found in. Otherwise, nothing is changed, and a -1 is returned. */
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extern int history_search ();
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/* Search the history for STRING, starting at history_offset.
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The search is anchored: matching lines must begin with string. */
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extern int history_search_prefix ();
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/* Search for STRING in the history list, starting at POS, an
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absolute index into the list. DIR, if negative, says to search
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backwards from POS, else forwards.
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Returns the absolute index of the history element where STRING
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was found, or -1 otherwise. */
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extern int history_search_pos ();
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/* Managing the history file. */
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/* Add the contents of FILENAME to the history list, a line at a time.
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If FILENAME is NULL, then read from ~/.history. Returns 0 if
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successful, or errno if not. */
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extern int read_history ();
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/* Read a range of lines from FILENAME, adding them to the history list.
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Start reading at the FROM'th line and end at the TO'th. If FROM
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is zero, start at the beginning. If TO is less than FROM, read
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until the end of the file. If FILENAME is NULL, then read from
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~/.history. Returns 0 if successful, or errno if not. */
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extern int read_history_range ();
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/* Write the current history to FILENAME. If FILENAME is NULL,
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then write the history list to ~/.history. Values returned
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are as in read_history (). */
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extern int write_history ();
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/* Append NELEMENT entries to FILENAME. The entries appended are from
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the end of the list minus NELEMENTs up to the end of the list. */
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int append_history ();
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/* Truncate the history file, leaving only the last NLINES lines. */
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extern int history_truncate_file ();
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/* History expansion. */
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/* Expand the string STRING, placing the result into OUTPUT, a pointer
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to a string. Returns:
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0) If no expansions took place (or, if the only change in
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the text was the de-slashifying of the history expansion
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character)
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1) If expansions did take place
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-1) If there was an error in expansion.
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2) If the returned line should just be printed.
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If an error ocurred in expansion, then OUTPUT contains a descriptive
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error message. */
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extern int history_expand ();
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/* Extract a string segment consisting of the FIRST through LAST
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arguments present in STRING. Arguments are broken up as in
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the shell. */
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extern char *history_arg_extract ();
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/* Return the text of the history event beginning at the current
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offset into STRING. */
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extern char *get_history_event ();
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/* Return an array of tokens, much as the shell might. The tokens are
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parsed out of STRING. */
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extern char **history_tokenize ();
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/* Exported history variables. */
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extern int history_base;
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extern int history_length;
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extern int max_input_history;
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extern char history_expansion_char;
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extern char history_subst_char;
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extern char history_comment_char;
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extern char *history_no_expand_chars;
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extern char *history_search_delimiter_chars;
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extern int history_quotes_inhibit_expansion;
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#endif /* !_HISTORY_H_ */
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