From c23d9cbdf8f10fa6ec1a6fb16ea963d733d67d47 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Thu, 15 Feb 2024 23:52:08 +0000
Subject: jao-doc-session: using built-in persistent vars

---
 init.el                    |  3 +++
 lib/doc/jao-doc-session.el | 40 +++++++++++-----------------------------
 2 files changed, 14 insertions(+), 29 deletions(-)

diff --git a/init.el b/init.el
index 9527abf..f29fb75 100644
--- a/init.el
+++ b/init.el
@@ -94,6 +94,9 @@
 (jao-load-site-el "pre")
 
 ;;; System Utilities
+;;; persist
+(require 'persist)
+
 ;;;; (no) backups
 (setq vc-make-backup-files nil
       make-backup-files nil)
diff --git a/lib/doc/jao-doc-session.el b/lib/doc/jao-doc-session.el
index 669b191..877a8cb 100644
--- a/lib/doc/jao-doc-session.el
+++ b/lib/doc/jao-doc-session.el
@@ -1,6 +1,6 @@
 ;;; jao-doc-session.el --- persistent document sessions  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2022  jao
+;; Copyright (C) 2022, 2024  jao
 
 ;; Author: jao <mail@jao.io>
 ;; Keywords: docs
@@ -20,30 +20,18 @@
 
 ;;; Code:
 
-(defvar jao-doc-session-file "~/.emacs.d/cache/doc-view-session.eld")
+(persist-defvar jao-doc-session nil "Documents session")
+
 (defvar-local jao-doc-session--is-doc nil)
 
 (defun jao-doc-session-is-doc (&optional buffer)
+  "Check whether the given or current buffer belong to the doc session."
   (buffer-local-value 'jao-doc-session--is-doc (or buffer (current-buffer))))
 
-(defun jao-doc-session--read-file (file)
-  (let ((buff (find-file-noselect file)))
-    (ignore-errors
-      (with-current-buffer buff
-        (goto-char (point-min)))
-      (read buff))))
-
-(defun jao-doc-session--save-to-file (file value)
-  (with-current-buffer (find-file-noselect file)
-    (erase-buffer)
-    (insert (format "%S" value))
-    (save-buffer)))
-
-(defun jao-doc-session (&optional file)
-  (let ((file (or file jao-doc-session-file)))
-    (jao-doc-session--read-file file)))
+(defun jao-doc-session (&optional file) jao-doc-session)
 
 (defun jao-doc-session-save (&optional skip-current force)
+  "Traverse all current buffers and update the value of `jao-doc-session'."
   (interactive)
   (let ((docs '())
         (cb (and skip-current (current-buffer))))
@@ -51,27 +39,21 @@
       (when-let (fs (and (not (eq cb b)) (jao-doc-session-is-doc b)))
         (dolist (f fs) (add-to-list 'docs f))))
     (when (or force (> (length docs) 0))
-      (jao-doc-session--save-to-file jao-doc-session-file docs))))
-
-(defun jao-doc-session--save-session ()
-  (let ((inhibit-message t)
-        (message-log-max nil))
-    (when (not jao-doc-session-inhibit-save) (jao-doc-session-save))
-    t))
+      (setq jao-doc-session docs))))
 
 (defun jao-doc-session-mark (&optional path)
+  "Mark the current buffer's file, or PATH, as persistent across sessions."
   (unless (listp jao-doc-session--is-doc)
     (setq jao-doc-session--is-doc (ensure-list jao-doc-session--is-doc)))
   (cl-pushnew (or path (buffer-file-name)) jao-doc-session--is-doc)
-  (jao-doc-session--save-session))
+  (jao-doc-session-save))
 
-(defun jao-doc-session--save-1 ()
+(defun jao-doc-session--maybe-save ()
   (when (jao-doc-session-is-doc) (jao-doc-session-save t)))
 
 (defvar jao-doc-session-inhibit-save nil)
 
-(add-hook 'kill-emacs-query-functions #'jao-doc-session--save-session)
-(add-hook 'kill-buffer-hook #'jao-doc-session--save-1)
+(add-hook 'kill-buffer-hook #'jao-doc-session--maybe-save)
 
 (provide 'jao-doc-session)
 ;;; jao-doc-session.el ends here
-- 
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