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Diffstat (limited to 'history.h')
| -rw-r--r-- | history.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/history.h b/history.h new file mode 100644 index 0000000..745e61c --- /dev/null +++ b/history.h @@ -0,0 +1,180 @@ +/* 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 (); + +extern int history_search_prefix (); +/* Search the history for @var{string}, starting at history_offset. + The search is anchored: matching lines must begin with string. */ +/* 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; |