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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 (cl-lib 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 'cl-lib)
(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) (cl-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))
(defun exwm-buffer-groups-switch-buffer (buffer-or-name)
"Display buffer BUFFER-OR-NAME in the selected window.
If called interactively, read the buffer name using
`completing-read', completing only on buffers in the current
workspace."
(interactive
(list
(let ((buffers-in-workspace (map 'list
#'buffer-name
(elt exwm-buffer-groups-buffers
exwm-workspace-current-index)))
(current-buffer (buffer-name (other-buffer (current-buffer)))))
(completing-read "Switch to buffer: " buffers-in-workspace
nil nil nil nil current-buffer))))
(switch-to-buffer buffer-or-name))
(defun exwm-buffer-groups-move (nth)
"Moves the current buffer to the NTH workspace."
(interactive
(list
(exwm-workspace--position
(exwm-workspace--prompt-for-workspace "Move workspace to: "))))
;; Switch out of the buffer.
(set-window-dedicated-p nil nil)
(switch-to-prev-buffer nil 'bury))
(add-hook 'after-change-major-mode-hook #'exwm-buffer-groups-update)
(provide 'exwm-buffer-groups)
;;; exwm-buffer-groups.el ends here
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