From 409afb58f365d609c80c598a5de687213c027065 Mon Sep 17 00:00:00 2001
From: JSDurand <mmemmew@gmail.com>
Date: Sun, 18 Jun 2023 17:06:03 +0800
Subject: desktop and bookmark: proper save mechanism

* bookmark-conf.el (durand-saving-bookmarks): This variable indicates
  whether or not we are saving bookmarks already.

  (#'bookmark-write-file): Just a formating change.

  (durand-save-bookmark-or-desktop): Save bookmarks and/or the desktop
  file, depending on its argument.

  (ctl-x-r-map): Bind 'C-x r s' to `durand-save-bookmark-or-desktop`.

* desktop-conf.el (durand-saving-bookmarks): In case this variable is
  not defined, silence the errors.

  (desktop-also-save-bookmarks): If we are not already saving
  bookmarks, save the bookmarks as well.

  (desktop-save-hook): Add `desktop-also-save-bookmarks` to this hook,
  so that when saving desktop and not already saving bookmarks, Emacs
  can automatically save bookmarks as well.
---
 bookmark-conf.el | 30 +++++++++++++++++++++++++++++-
 desktop-conf.el  | 12 ++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/bookmark-conf.el b/bookmark-conf.el
index 074628f..eddb3d5 100644
--- a/bookmark-conf.el
+++ b/bookmark-conf.el
@@ -442,8 +442,36 @@ Modified by Durand to use `print' instead of `pp'.
 	  (kill-buffer (current-buffer))
 	  (progress-reporter-done reporter))))))
 
-(advice-add #'bookmark-write-file :override #'durand-bookmark-write-file)
+(advice-add #'bookmark-write-file :override
+            #'durand-bookmark-write-file)
 
+;;; Intelligent saving of bookmarks and desktop files
+
+(load-config "desktop-conf.el")
+
+(defvar durand-saving-bookmarks nil
+  "Non-nil if we are saving bookmarks already.")
+
+(defun durand-save-bookmark-or-desktop (&optional arg)
+  "Save bookmarks and/or desktop depending on ARG.
+
+If and only if ARG is non-nil, save the desktop file.
+
+If and only if ARG is an integer, do not save bookmarks.
+
+Below are listed three possible scenarios:
+
+1. ARG = nil: save bookmarks only.
+2. ARG = '(4): save both bookmarks and desktop.
+3. ARG = integer: save desktop only."
+  (interactive "P")
+  (cond (arg
+         (let ((durand-saving-bookmarks t))
+           (desktop-save (car desktop-path))
+           (message "desktop saved"))))
+  (cond ((not (integerp arg)) (bookmark-save))))
+
+(define-key ctl-x-r-map (vector ?s) #'durand-save-bookmark-or-desktop)
 
 (provide 'bookmark-conf)
 ;;; bookmark-conf.el ends here
diff --git a/desktop-conf.el b/desktop-conf.el
index 462c549..074aad0 100644
--- a/desktop-conf.el
+++ b/desktop-conf.el
@@ -198,5 +198,17 @@ no questions asked."
 
 (desktop-save-mode 1)
 
+;;; Add a hook to save bookmarks if we are not already saving them.
+
+(defvar durand-saving-bookmarks)
+
+(defun desktop-also-save-bookmarks ()
+  "Save bookmarks if we are not already saving bookmarks."
+  (cond
+   ((and (functionp #'bookmark-save) (not durand-saving-bookmarks))
+    (bookmark-save))))
+
+(add-hook 'desktop-save-hook #'desktop-also-save-bookmarks)
+
 (provide 'desktop-conf)
 ;;; desktop-conf.el ends here
-- 
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