source: trunk/third/readline/history.h @ 12992

Revision 12992, 9.0 KB checked in by kcr, 25 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r12991, which included commits to RCS files with non-trunk default branches.
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1/* History.h -- the names of functions that you can call in history. */
2/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
3
4   This file contains the GNU History Library (the Library), a set of
5   routines for managing the text of previously typed lines.
6
7   The Library is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 1, or (at your option)
10   any later version.
11
12   The Library is distributed in the hope that it will be useful, but
13   WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15   General Public License for more details.
16
17   The GNU General Public License is often shipped with GNU software, and
18   is generally kept in a file called COPYING or LICENSE.  If you do not
19   have a copy of the license, write to the Free Software Foundation,
20   675 Mass Ave, Cambridge, MA 02139, USA. */
21
22#ifndef _HISTORY_H_
23#define _HISTORY_H_
24
25#ifdef __cplusplus
26extern "C" {
27#endif
28
29#if defined READLINE_LIBRARY
30#  include "rlstdc.h"
31#else
32#  include <readline/rlstdc.h>
33#endif
34
35#if !defined (_FUNCTION_DEF)
36#  define _FUNCTION_DEF
37typedef int Function ();
38typedef void VFunction ();
39typedef char *CPFunction ();
40typedef char **CPPFunction ();
41#endif
42
43#ifdef __STDC__
44typedef void *histdata_t;
45#else
46typedef char *histdata_t;
47#endif
48
49/* The structure used to store a history entry. */
50typedef struct _hist_entry {
51  char *line;
52  histdata_t data;
53} HIST_ENTRY;
54
55/* A structure used to pass the current state of the history stuff around. */
56typedef struct _hist_state {
57  HIST_ENTRY **entries;         /* Pointer to the entries themselves. */
58  int offset;                   /* The location pointer within this array. */
59  int length;                   /* Number of elements within this array. */
60  int size;                     /* Number of slots allocated to this array. */
61  int flags;
62} HISTORY_STATE;
63
64/* Flag values for the `flags' member of HISTORY_STATE. */
65#define HS_STIFLED      0x01
66
67/* Initialization and state management. */
68
69/* Begin a session in which the history functions might be used.  This
70   just initializes the interactive variables. */
71extern void using_history __P((void));
72
73/* Return the current HISTORY_STATE of the history. */
74extern HISTORY_STATE *history_get_history_state __P((void));
75
76/* Set the state of the current history array to STATE. */
77extern void history_set_history_state __P((HISTORY_STATE *));
78
79/* Manage the history list. */
80
81/* Place STRING at the end of the history list.
82   The associated data field (if any) is set to NULL. */
83extern void add_history __P((char *));
84
85/* A reasonably useless function, only here for completeness.  WHICH
86   is the magic number that tells us which element to delete.  The
87   elements are numbered from 0. */
88extern HIST_ENTRY *remove_history __P((int));
89
90/* Make the history entry at WHICH have LINE and DATA.  This returns
91   the old entry so you can dispose of the data.  In the case of an
92   invalid WHICH, a NULL pointer is returned. */
93extern HIST_ENTRY *replace_history_entry __P((int, char *, histdata_t));
94
95/* Clear the history list and start over. */
96extern void clear_history __P((void));
97
98/* Stifle the history list, remembering only MAX number of entries. */
99extern void stifle_history __P((int));
100
101/* Stop stifling the history.  This returns the previous amount the
102   history was stifled by.  The value is positive if the history was
103   stifled, negative if it wasn't. */
104extern int unstifle_history __P((void));
105
106/* Return 1 if the history is stifled, 0 if it is not. */
107extern int history_is_stifled __P((void));
108
109/* Information about the history list. */
110
111/* Return a NULL terminated array of HIST_ENTRY which is the current input
112   history.  Element 0 of this list is the beginning of time.  If there
113   is no history, return NULL. */
114extern HIST_ENTRY **history_list __P((void));
115
116/* Returns the number which says what history element we are now
117   looking at.  */
118extern int where_history __P((void));
119 
120/* Return the history entry at the current position, as determined by
121   history_offset.  If there is no entry there, return a NULL pointer. */
122HIST_ENTRY *current_history __P((void));
123
124/* Return the history entry which is logically at OFFSET in the history
125   array.  OFFSET is relative to history_base. */
126extern HIST_ENTRY *history_get __P((int));
127
128/* Return the number of bytes that the primary history entries are using.
129   This just adds up the lengths of the_history->lines. */
130extern int history_total_bytes __P((void));
131
132/* Moving around the history list. */
133
134/* Set the position in the history list to POS. */
135int history_set_pos __P((int));
136
137/* Back up history_offset to the previous history entry, and return
138   a pointer to that entry.  If there is no previous entry, return
139   a NULL pointer. */
140extern HIST_ENTRY *previous_history __P((void));
141
142/* Move history_offset forward to the next item in the input_history,
143   and return the a pointer to that entry.  If there is no next entry,
144   return a NULL pointer. */
145extern HIST_ENTRY *next_history __P((void));
146
147/* Searching the history list. */
148
149/* Search the history for STRING, starting at history_offset.
150   If DIRECTION < 0, then the search is through previous entries,
151   else through subsequent.  If the string is found, then
152   current_history () is the history entry, and the value of this function
153   is the offset in the line of that history entry that the string was
154   found in.  Otherwise, nothing is changed, and a -1 is returned. */
155extern int history_search __P((char *, int));
156
157/* Search the history for STRING, starting at history_offset.
158   The search is anchored: matching lines must begin with string.
159   DIRECTION is as in history_search(). */
160extern int history_search_prefix __P((char *, int));
161
162/* Search for STRING in the history list, starting at POS, an
163   absolute index into the list.  DIR, if negative, says to search
164   backwards from POS, else forwards.
165   Returns the absolute index of the history element where STRING
166   was found, or -1 otherwise. */
167extern int history_search_pos __P((char *, int, int));
168
169/* Managing the history file. */
170
171/* Add the contents of FILENAME to the history list, a line at a time.
172   If FILENAME is NULL, then read from ~/.history.  Returns 0 if
173   successful, or errno if not. */
174extern int read_history __P((char *));
175
176/* Read a range of lines from FILENAME, adding them to the history list.
177   Start reading at the FROM'th line and end at the TO'th.  If FROM
178   is zero, start at the beginning.  If TO is less than FROM, read
179   until the end of the file.  If FILENAME is NULL, then read from
180   ~/.history.  Returns 0 if successful, or errno if not. */
181extern int read_history_range __P((char *, int, int));
182
183/* Write the current history to FILENAME.  If FILENAME is NULL,
184   then write the history list to ~/.history.  Values returned
185   are as in read_history ().  */
186extern int write_history __P((char *));
187
188/* Append NELEMENT entries to FILENAME.  The entries appended are from
189   the end of the list minus NELEMENTs up to the end of the list. */
190int append_history __P((int, char *));
191
192/* Truncate the history file, leaving only the last NLINES lines. */
193extern int history_truncate_file __P((char *, int));
194
195/* History expansion. */
196
197/* Expand the string STRING, placing the result into OUTPUT, a pointer
198   to a string.  Returns:
199
200   0) If no expansions took place (or, if the only change in
201      the text was the de-slashifying of the history expansion
202      character)
203   1) If expansions did take place
204  -1) If there was an error in expansion.
205   2) If the returned line should just be printed.
206
207  If an error ocurred in expansion, then OUTPUT contains a descriptive
208  error message. */
209extern int history_expand __P((char *, char **));
210
211/* Extract a string segment consisting of the FIRST through LAST
212   arguments present in STRING.  Arguments are broken up as in
213   the shell. */
214extern char *history_arg_extract __P((int, int, char *));
215
216/* Return the text of the history event beginning at the current
217   offset into STRING.  Pass STRING with *INDEX equal to the
218   history_expansion_char that begins this specification.
219   DELIMITING_QUOTE is a character that is allowed to end the string
220   specification for what to search for in addition to the normal
221   characters `:', ` ', `\t', `\n', and sometimes `?'. */
222extern char *get_history_event __P((char *, int *, int));
223
224/* Return an array of tokens, much as the shell might.  The tokens are
225   parsed out of STRING. */
226extern char **history_tokenize __P((char *));
227
228/* Exported history variables. */
229extern int history_base;
230extern int history_length;
231extern int max_input_history;
232extern char history_expansion_char;
233extern char history_subst_char;
234extern char history_comment_char;
235extern char *history_no_expand_chars;
236extern char *history_search_delimiter_chars;
237extern int history_quotes_inhibit_expansion;
238
239/* If set, this function is called to decide whether or not a particular
240   history expansion should be treated as a special case for the calling
241   application and not expanded. */
242extern Function *history_inhibit_expansion_function;
243
244#ifdef __cplusplus
245}
246#endif
247
248#endif /* !_HISTORY_H_ */
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