182 lines
6.6 KiB
C
182 lines
6.6 KiB
C
/* History.h -- the names of functions that you can call in history. */
|
|
|
|
/* The structure used to store a history entry. */
|
|
typedef struct _hist_entry {
|
|
char *line;
|
|
char *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. */
|
|
extern void using_history ();
|
|
|
|
/* Return the current HISTORY_STATE of the history. */
|
|
extern HISTORY_STATE *history_get_history_state ();
|
|
|
|
/* Set the state of the current history array to STATE. */
|
|
extern void history_set_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. */
|
|
extern void add_history ();
|
|
|
|
/* 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. */
|
|
extern HIST_ENTRY *remove_history ();
|
|
|
|
/* 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. */
|
|
extern HIST_ENTRY *replace_history_entry ();
|
|
|
|
/* Stifle the history list, remembering only MAX number of entries. */
|
|
extern void stifle_history ();
|
|
|
|
/* 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. */
|
|
extern int unstifle_history ();
|
|
|
|
/* Return 1 if the history is stifled, 0 if it is not. */
|
|
extern int history_is_stifled ();
|
|
|
|
/* 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. */
|
|
extern HIST_ENTRY **history_list ();
|
|
|
|
/* Returns the number which says what history element we are now
|
|
looking at. */
|
|
extern int where_history ();
|
|
|
|
/* Return the history entry at the current position, as determined by
|
|
history_offset. If there is no entry there, return a NULL pointer. */
|
|
HIST_ENTRY *current_history ();
|
|
|
|
/* Return the history entry which is logically at OFFSET in the history
|
|
array. OFFSET is relative to history_base. */
|
|
extern HIST_ENTRY *history_get ();
|
|
|
|
/* Return the number of bytes that the primary history entries are using.
|
|
This just adds up the lengths of the_history->lines. */
|
|
extern int history_total_bytes ();
|
|
|
|
/* Moving around the history list. */
|
|
|
|
/* Set the position in the history list to POS. */
|
|
int history_set_pos ();
|
|
|
|
/* 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. */
|
|
extern HIST_ENTRY *previous_history ();
|
|
|
|
/* 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. */
|
|
extern HIST_ENTRY *next_history ();
|
|
|
|
/* 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. */
|
|
extern int history_search ();
|
|
|
|
/* Search the history for STRING, starting at history_offset.
|
|
The search is anchored: matching lines must begin with string. */
|
|
extern int history_search_prefix ();
|
|
|
|
/* 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. */
|
|
extern int history_search_pos ();
|
|
|
|
/* 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. */
|
|
extern int read_history ();
|
|
|
|
/* 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. */
|
|
extern int read_history_range ();
|
|
|
|
/* Write the current history to FILENAME. If FILENAME is NULL,
|
|
then write the history list to ~/.history. Values returned
|
|
are as in read_history (). */
|
|
extern int write_history ();
|
|
|
|
/* Append NELEMENT entries to FILENAME. The entries appended are from
|
|
the end of the list minus NELEMENTs up to the end of the list. */
|
|
int append_history ();
|
|
|
|
/* Truncate the history file, leaving only the last NLINES lines. */
|
|
extern int history_truncate_file ();
|
|
|
|
/* 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. */
|
|
extern int history_expand ();
|
|
|
|
/* Extract a string segment consisting of the FIRST through LAST
|
|
arguments present in STRING. Arguments are broken up as in
|
|
the shell. */
|
|
extern char *history_arg_extract ();
|
|
|
|
/* Return the text of the history event beginning at the current
|
|
offset into STRING. */
|
|
extern char *get_history_event ();
|
|
|
|
/* Return an array of tokens, much as the shell might. The tokens are
|
|
parsed out of STRING. */
|
|
extern char **history_tokenize ();
|
|
|
|
/* Exported history variables. */
|
|
extern int history_base;
|
|
extern int history_length;
|
|
extern int max_input_history;
|
|
extern char history_expansion_char;
|
|
extern char history_subst_char;
|
|
extern char history_comment_char;
|
|
extern char *history_no_expand_chars;
|