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;;; repro-preview-cache.el --- Does dirvish's text preview disturb an org buffer's element cache? -*- lexical-binding: t -*-
;; Replays `dirvish--preview-file-maybe-truncate' (dirvish.el:653-684) against an
;; org file that is ALSO open for real, then kills the preview buffer the way
;; dirvish does (`dirvish--kill-buffer', dirvish.el:416). The kill is the step
;; that matters: killing an org-mode buffer with a `buffer-file-name' is when
;; org-persist writes that file's cache.
(require 'org)
(require 'org-element)
(require 'org-persist)
(setq org-element-use-cache t
org-element-cache-persistent nil
org-element--cache-self-verify t
org-element--cache-self-verify-frequency 1.0)
(defun repro--build-cache (buf)
"Actually populate the element cache of BUF by walking it."
(with-current-buffer buf
(org-element-cache-map (lambda (_el) nil) :granularity 'element)
(and org-element--cache (avl-tree-size org-element--cache))))
(defun repro--warnings ()
(when (get-buffer "*Warnings*")
(with-current-buffer "*Warnings*" (string-trim (buffer-string)))))
(let* ((src (expand-file-name "todo.org" default-directory))
(file (make-temp-file "repro-" nil ".org"))
(threshold 1048576))
(copy-file src file t)
(let ((size (nth 7 (file-attributes file))))
(message "== fixture %s (%d bytes, %s threshold) =="
(file-name-nondirectory file) size
(if (>= size threshold) "over" "under")))
(let ((real (find-file-noselect file)))
(message "real buffer cache after full walk: %S" (repro--build-cache real))
;; --- dirvish text preview of the same file ---
(with-current-buffer (get-buffer-create "*preview-temp*")
(let (jka-compr-verbose)
(with-silent-modifications
(setq buffer-read-only t)
(insert-file-contents file nil 0 threshold)
(when (>= (nth 7 (file-attributes file)) threshold)
(goto-char (point-max))
(insert "\n\nFile truncated. End of partial preview.\n"))
(setq buffer-file-name file)
(goto-char (point-min))
(rename-buffer (format "PREVIEW :: %s" (file-name-nondirectory file))))
(let ((enable-dir-local-variables nil)
(enable-local-variables :safe)
(non-essential t))
(set-auto-mode)
(font-lock-mode 1)))
(message "preview buffer: mode=%s claims=%s cache=%S"
major-mode (file-name-nondirectory (or buffer-file-name "none"))
(repro--build-cache (current-buffer))))
(message "-- both buffers live: real=%S claiming-file=%d --"
(with-current-buffer real (avl-tree-size org-element--cache))
(length (seq-filter (lambda (b) (equal (buffer-local-value 'buffer-file-name b) file))
(buffer-list))))
;; --- dirvish kills the preview buffer when the session ends ---
(let ((kill-buffer-query-functions nil)
(preview (format "PREVIEW :: %s" (file-name-nondirectory file))))
(kill-buffer preview)
(message "preview buffer %S killed" preview))
;; --- is the real buffer still coherent? ---
(with-current-buffer real
;; Edit it the way Craig would after stepping back from dirvish.
(goto-char (point-max))
(condition-case err
(let ((inhibit-read-only t)) (insert "\n* Repro edit\n"))
(error (message "RESULT: insert into real buffer SIGNALLED %S" (car err))))
(condition-case err
(progn (org-element-cache-map (lambda (_el) nil) :granularity 'element)
(message "post-kill cache-map: clean (size=%S)"
(avl-tree-size org-element--cache)))
(error (message "post-kill cache-map: ERROR %S" err)))
(set-buffer-modified-p nil))
(message "warnings=%s" (or (repro--warnings) "none")))
(delete-file file))
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