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Cache current thing to focus

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Avoid calculating the thing to focus on every update.
This commit is contained in:
Florian Rommel 2024-05-19 23:24:53 +02:00
parent 2507ec4ec5
commit fe50fbeb2b
1 changed files with 19 additions and 8 deletions
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27
focus.el
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@ -52,7 +52,9 @@ many derivatives should be placed by the end of the list.
Things that are defined include `symbol', `list', `sexp',
`defun', `filename', `url', `email', `word', `sentence',
`whitespace', `line', and `page'."
`whitespace', `line', and `page'.
In order for changes to take effect, reenable `focus-mode'."
:type '(alist :key-type symbol :valye-type symbol)
:group 'focus)
@ -76,6 +78,9 @@ Things that are defined include `symbol', `list', `sexp',
(defvar-local focus-current-thing nil
"Overrides the choice of thing dictated by `focus-mode-to-thing' if set.")
(defvar-local focus-current-thing-cache nil
"Caches the current thing to focus.")
(defvar-local focus-buffer nil
"Local reference to the buffer focus functions operate on.")
@ -94,12 +99,16 @@ The timer calls `focus-read-only-hide-cursor' after
`focus-read-only-blink-seconds' seconds.")
(defun focus-get-thing ()
"Return the current thing, based on `focus-mode-to-thing'."
"Return the current thing, based on `focus-mode-to-thing'.
This also sets `focus-current-thing-cache' to the current thing."
(or focus-current-thing
(let* ((modes (mapcar 'car focus-mode-to-thing))
(mode (or (cl-find major-mode modes)
(apply #'derived-mode-p modes))))
(if mode (cdr (assoc mode focus-mode-to-thing)) 'sentence))))
focus-current-thing-cache
(setq focus-current-thing-cache
(let* ((modes (mapcar 'car focus-mode-to-thing))
(mode (or (cl-find major-mode modes)
(apply #'derived-mode-p modes))))
(if mode (cdr (assoc mode focus-mode-to-thing)) 'sentence)))))
(defun focus-bounds ()
"Return the current bounds, based on `focus-get-thing'."
@ -109,7 +118,7 @@ The timer calls `focus-read-only-hide-cursor' after
(beg (org-element-property :begin elem))
(end (org-element-property :end elem)))
(cons beg end)))
(t (bounds-of-thing-at-point (focus-get-thing))))))
(t (bounds-of-thing-at-point thing)))))
(defun focus-move-focus ()
"Move the focused section according to `focus-bounds'.
@ -143,6 +152,7 @@ It sets the `focus-pre-overlay', `focus-min-overlay', and
(mapc (lambda (o) (overlay-put o 'face 'focus-unfocused))
(list focus-pre-overlay focus-post-overlay))
(add-hook 'post-command-hook 'focus-move-focus nil t)
(setq focus-current-thing-cache nil)
(add-hook 'change-major-mode-hook 'focus-terminate nil t)))
(defun focus-terminate ()
@ -155,7 +165,8 @@ The overlays pointed to by `focus-pre-overlay',
(mapc 'delete-overlay
(list focus-pre-overlay focus-mid-overlay focus-post-overlay))
(remove-hook 'post-command-hook 'focus-move-focus t)
(setq focus-pre-overlay nil
(setq focus-current-thing-cache nil
focus-pre-overlay nil
focus-mid-overlay nil
focus-post-overlay nil)))