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Add comments for undo-tree advice

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Describes why we try to compress undo-tree history data. I'm aware that
undo-tree-auto-save-history is disabled, but that may change in the near
future.
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Henrik Lissner 2019-10-03 12:03:42 -04:00
parent f68203c2ef
commit ed96d60e2c
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9
core/core-editor.el
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@ -426,11 +426,20 @@ files, so we replace calls to `pp' with the much faster `prin1'."
undo-tree-history-directory-alist
`(("." . ,(concat doom-cache-dir "undo-tree-hist/"))))
;; Compress undo-tree history files with zstd, if available. File size isn't
;; the (only) concern here: the file IO barrier is slow for Emacs to cross;
;; reading a tiny file and piping it in-memory through zstd is *slightly*
;; faster than Emacs reading the entire undo-tree file from the get go (on
;; SSDs). Whether or not that's true in practice, we still enjoy zstd's ~80%
;; file savings (these files add up over time and zstd is so incredibly fast).
(when (executable-find "zstd")
(defadvice! doom--undo-tree-make-history-save-file-name-a (file)
:filter-return #'undo-tree-make-history-save-file-name
(concat file ".zst")))
;; Strip text properties from undo-tree data to stave off bloat. File size
;; isn't the concern here; undo cache files bloat easily, which can cause
;; freezing, crashes, GC-induced stuttering or delays when opening files.
(defadvice! doom--undo-tree-strip-text-properties-a (&rest _)
:before #'undo-list-transfer-to-tree
(dolist (item buffer-undo-list)