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Add hook to customize how elfeed-db-gc finds elfeed-refs #457

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Add hook to customize how elfeed-db-gc finds elfeed-refs #457

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15 changes: 14 additions & 1 deletion elfeed-db.el
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,12 @@ the :last-update time is updated.")
(defvar elfeed-db-unload-hook ()
"Hook to run immediately after `elfeed-db-unload'.")

(defvar elfeed-db-gc-trace-functions ()
"A list of functions called to determine which elfeed-ref's are reachable.
Each function is called with an elfeed-entry and should return a
single elfeed-ref or a list of them, which will be considered in
use by `elfeed-db-gc'.")

;; Data model:

(cl-defstruct (elfeed-feed (:constructor elfeed-feed--create))
Expand Down Expand Up @@ -582,7 +588,14 @@ If STATS is true, return the space cleared in bytes."
(with-elfeed-db-visit (entry _)
(let ((content (elfeed-entry-content entry)))
(when (elfeed-ref-p content)
(setf (gethash (elfeed-ref-id content) table) t))))
(setf (gethash (elfeed-ref-id content) table) t)))
(dolist (trace-function elfeed-db-gc-trace-functions)
(let ((refs (funcall trace-function entry)))
(unless (listp refs)
(setf refs (list refs)))
(dolist (ref refs)
(when (elfeed-ref-p ref)
(setf (gethash (elfeed-ref-id ref) table) t))))))
(cl-loop for id hash-keys of table using (hash-value used)
for used-p = (or used (member id '("." "..")))
when (and (not used-p) stats-p)
Expand Down