From 16db26c60b1be680cf8873f89208bfd7a4765e16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sat, 16 Oct 2021 20:33:15 +0200
Subject: Emacs: Associate layout with individual buffers instead

---
 .emacs.d/init.el | 79 +++++++++++++++++++++++---------------------------------
 1 file changed, 32 insertions(+), 47 deletions(-)

diff --git a/.emacs.d/init.el b/.emacs.d/init.el
index a28c2b4..15c8a03 100644
--- a/.emacs.d/init.el
+++ b/.emacs.d/init.el
@@ -186,54 +186,39 @@
 ;; (add-to-list 'ibuffer-never-show-predicates "^magit-")
 
 ;;; Layouts
-(defvar *layout-stack* (list) "Window layout stack")
-(defvar *active-layout* -1 "Active window layout")
-(defun layout-load-fun (reg)
-  (lambda ()
-    (interactive)
-    (when (not (= *active-layout* reg))
-      (set-register *active-layout* (current-window-configuration))
-      (set-window-configuration (get-register reg))
-      (when *active-layout*
-	(push *layout-stack* *active-layout*))
-      (setq *active-layout* reg)
-      (message (format-message "Loaded layout %c." reg)))))
-(defun layout-save-fun (reg)
-  (lambda ()
-    (interactive)
-    (when (not (= *active-layout* reg))
-      (setq *active-layout* reg)
-      (message (format-message "Saved layout %c." reg)))))
-(defun which-layout ()
+(defvar *buffer-layouts* (list) "Buffer-layout associations")
+(defun restore-buffer-layout ()
+  "Restore the layout associated with the current buffer."
   (interactive)
-  (message (format-message "Current layout: %c" *active-layout*)))
-(set-keys "C-c §"   which-layout
-	  "C-c 1"   (layout-load-fun ?1)
-	  "C-c M-1" (layout-save-fun ?1)
-	  "C-c 2"   (layout-load-fun ?2)
-	  "C-c M-2" (layout-save-fun ?2)
-	  "C-c 3"   (layout-load-fun ?3)
-	  "C-c M-3" (layout-save-fun ?3)
-	  "C-c 4"   (layout-load-fun ?4)
-	  "C-c M-4" (layout-save-fun ?4)
-	  "C-c 5"   (layout-load-fun ?5)
-	  "C-c M-5" (layout-save-fun ?5)
-	  "C-c 6"   (layout-load-fun ?6)
-	  "C-c M-6" (layout-save-fun ?6)
-	  "C-c 7"   (layout-load-fun ?7)
-	  "C-c M-7" (layout-save-fun ?7)
-	  "C-c 8"   (layout-load-fun ?8)
-	  "C-c M-8" (layout-save-fun ?8)
-	  "C-c 9"   (layout-load-fun ?9)
-	  "C-c M-9" (layout-save-fun ?9)
-	  "C-c 0"   (layout-load-fun ?0)
-	  "C-c M-0" (layout-save-fun ?0))
-					; In a way, the only thing
-					; that is needed is to hook
-					; into the "create other
-					; window" hook and save the
-					; previous layout and the new
-					; layout.
+  (let ((conf (alist-get (current-buffer) *buffer-layouts*)))
+    (when (not conf)
+      (error "No layout associated with buffer."))
+    (set-window-configuration conf)
+    (message "Restored buffer layout.")))
+(defun switch-to-buffer-with-layout ()
+  "Switch to the window layout associated with a buffer. At the
+same time, associate the original buffer with the original
+layout.
+
+If the new buffer has no associated layout, it is displayed as
+the only window in the frame."
+  (interactive)
+  (dolist (window (window-list))
+    (setf (alist-get (window-buffer window) *buffer-layouts*)
+	  (current-window-configuration)))
+  (call-interactively #'helm-multi-files)
+  (delete-other-windows)
+  (let* ((buf (current-buffer))
+	 (conf (alist-get buf *buffer-layouts*)))
+    (when conf
+      (set-window-configuration conf)
+      (select-window (get-buffer-window buf)))))
+(defun delete-layout-before-delete-window (window)
+  (setf (alist-get (window-buffer window) *buffer-layouts*) nil))
+(advice-add #'delete-window :before #'delete-layout-before-delete-window)
+(advice-add #'quit-window :before #'delete-layout-before-delete-window)
+(set-keys "C-c b" switch-to-buffer-with-layout
+	  "C-c n" restore-buffer-layout)
 
 ;;; Lisp
 (autoload #'enable-paredit-mode "paredit" nil t)
-- 
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