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+;;; exwm-buffer-groups.el --- Buffer grouping for EXWM workspaces. -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019 Jakob L. Kreuze
+
+;; Author: Jakob L. Kreuze <zerodaysfordays@sdf.lonestar.org>
+;; Version: 1.0
+;; Package-Requires (exwm)
+;; Keywords: frames
+;; URL: https://git.sr.ht/~jakob/exwm-buffer-groups
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; The default behavior of EXWM is to make buffers containing X windows
+;; accessible only from the workspace they were created in. This is a useful
+;; feature, but introduces some level of inconsistency as this does not apply to
+;; normal buffers. exwm-buffer-groups aims to change this by associating all
+;; buffers with a workspace.
+
+;;; Code:
+
+(require 'exwm)
+
+(defun exwm-buffer-groups-default-buffers ()
+  "Initial list of buffers for a workspace."
+  (if (get-buffer "*scratch*")
+      (list (get-buffer "*scratch*"))
+    nil))
+
+(defvar exwm-buffer-groups-buffers
+  (make-vector exwm-workspace-number (exwm-buffer-groups-default-buffers))
+  "Vector containing lists of associated buffers for each workspace.")
+
+(defun exwm-buffer-groups--buffer-seen-p (buffer)
+  "Whether or not BUFFER is contained in `exwm-buffer-groups-buffers'."
+  (reduce #'(lambda (x y) (or x y))
+          (map 'list
+               #'(lambda (workspace)
+                   (memq buffer workspace))
+               exwm-buffer-groups-buffers)))
+
+(defun exwm-buffer-groups--remove-buffers ()
+  "Removes dead buffers from `exwm-buffer-groups-buffers'."
+  (setq exwm-buffer-groups-buffers
+        (map 'vector
+             #'(lambda (buffers) (remove-if-not #'buffer-live-p buffers))
+             exwm-buffer-groups-buffers)))
+
+(defun exwm-buffer-groups--add-buffers ()
+  "Adds unseen buffers to `exwm-buffer-groups-buffers'.
+Any unseen buffers are added to the entry corresponding to the
+current workspace."
+  (dolist (buffer (buffer-list))
+    (unless (exwm-buffer-groups--buffer-seen-p buffer)
+      (push buffer (elt exwm-buffer-groups-buffers exwm-workspace-current-index)))))
+
+(defun exwm-buffer-groups-update ()
+  "Updates `exwm-buffer-groups-buffers' to reflect the buffer list."
+  (exwm-buffer-groups--remove-buffers)
+  (exwm-buffer-groups--add-buffers))
+
+(add-hook 'after-change-major-mode-hook #'exwm-buffer-groups-update)
+
+(provide 'exwm-buffer-groups)
+;;; exwm-buffer-groups.el ends here