| 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 2, 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 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| 21 | |
| 22 | #ifndef _HISTORY_H_ |
| 23 | #define _HISTORY_H_ |
| 24 | |
| 25 | #ifdef __cplusplus |
| 26 | extern "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 |
| 37 | typedef int Function (); |
| 38 | typedef void VFunction (); |
| 39 | typedef char *CPFunction (); |
| 40 | typedef char **CPPFunction (); |
| 41 | #endif |
| 42 | |
| 43 | #ifdef __STDC__ |
| 44 | typedef void *histdata_t; |
| 45 | #else |
| 46 | typedef char *histdata_t; |
| 47 | #endif |
| 48 | |
| 49 | /* The structure used to store a history entry. */ |
| 50 | typedef 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. */ |
| 56 | typedef 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. */ |
| 71 | extern void using_history __P((void)); |
| 72 | |
| 73 | /* Return the current HISTORY_STATE of the history. */ |
| 74 | extern HISTORY_STATE *history_get_history_state __P((void)); |
| 75 | |
| 76 | /* Set the state of the current history array to STATE. */ |
| 77 | extern 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. */ |
| 83 | extern 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. */ |
| 88 | extern 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. */ |
| 93 | extern HIST_ENTRY *replace_history_entry __P((int, char *, histdata_t)); |
| 94 | |
| 95 | /* Clear the history list and start over. */ |
| 96 | extern void clear_history __P((void)); |
| 97 | |
| 98 | /* Stifle the history list, remembering only MAX number of entries. */ |
| 99 | extern 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. */ |
| 104 | extern int unstifle_history __P((void)); |
| 105 | |
| 106 | /* Return 1 if the history is stifled, 0 if it is not. */ |
| 107 | extern 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. */ |
| 114 | extern HIST_ENTRY **history_list __P((void)); |
| 115 | |
| 116 | /* Returns the number which says what history element we are now |
| 117 | looking at. */ |
| 118 | extern 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. */ |
| 122 | extern HIST_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. */ |
| 126 | extern 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. */ |
| 130 | extern int history_total_bytes __P((void)); |
| 131 | |
| 132 | /* Moving around the history list. */ |
| 133 | |
| 134 | /* Set the position in the history list to POS. */ |
| 135 | extern int 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. */ |
| 140 | extern 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. */ |
| 145 | extern 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. */ |
| 155 | extern 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(). */ |
| 160 | extern 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. */ |
| 167 | extern 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. */ |
| 174 | extern 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. */ |
| 181 | extern 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 (). */ |
| 186 | extern 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. */ |
| 190 | extern int append_history __P((int, char *)); |
| 191 | |
| 192 | /* Truncate the history file, leaving only the last NLINES lines. */ |
| 193 | extern 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. */ |
| 209 | extern 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. */ |
| 214 | extern 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 `?'. */ |
| 222 | extern 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. */ |
| 226 | extern char **history_tokenize __P((char *)); |
| 227 | |
| 228 | /* Exported history variables. */ |
| 229 | extern int history_base; |
| 230 | extern int history_length; |
| 231 | extern int max_input_history; |
| 232 | extern char history_expansion_char; |
| 233 | extern char history_subst_char; |
| 234 | extern char history_comment_char; |
| 235 | extern char *history_no_expand_chars; |
| 236 | extern char *history_search_delimiter_chars; |
| 237 | extern 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. */ |
| 242 | extern Function *history_inhibit_expansion_function; |
| 243 | |
| 244 | #ifdef __cplusplus |
| 245 | } |
| 246 | #endif |
| 247 | |
| 248 | #endif /* !_HISTORY_H_ */ |