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55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
#ifndef EL__SESSION_HISTORY_H
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#define EL__SESSION_HISTORY_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct location;
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struct session;
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struct ses_history {
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/** The first list item is the first visited location. The last list
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* item is the last location in the unhistory. The #current location is
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* included in this list. */
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LIST_OF(struct location) history;
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/** The current location. This is moveable pivot pointing somewhere at
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* the middle of #history. */
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struct location *current;
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};
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void create_history(struct ses_history *history);
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void destroy_history(struct ses_history *history);
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void clean_unhistory(struct ses_history *history);
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void add_to_history(struct ses_history *history, struct location *loc);
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void del_from_history(struct ses_history *history, struct location *loc);
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/** Note that this function is dangerous, and its results are sort of
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* unpredictable. If the document is cached and is permitted to be fetched from
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* the cache, the effect of this function is immediate and you end up with the
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* new location being cur_loc(). BUT if the cache entry cannot be used, the
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* effect is delayed to the next main loop iteration, as the TASK_HISTORY
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* session task (ses_history_move()) is executed not now but in the bottom-half
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* handler. So, you MUST NOT depend on cur_loc() having an arbitrary value
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* after call to this function (or the regents go_(un)back(), of course). */
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void go_history(struct session *ses, struct location *loc);
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/** Move back -@a n times if @a n is negative, forward @a n times if
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* positive. */
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int go_history_by_n(struct session *ses, int n);
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void go_back(struct session *ses);
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void go_unback(struct session *ses);
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void ses_history_move(struct session *ses);
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#ifdef __cplusplus
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}
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#endif
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#endif
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