;;; window-manager.el --- Functions augmenting my usage of EXWM -*- lexical-binding: t -*-
;; Author: William Carroll <wpcarro@gmail.com>
;; Version: 0.0.1
;; Package-Requires: ((emacs "25.1"))
;;; Commentary:
;; I switched to EXWM from i3, and I haven't looked back. One day I may write a
;; poem declaring my love for Emacs and EXWM. For now, I haven't the time.
;; Wist List:
;; - TODO: Consider supporting MRU cache of worksapces.
;;; Code:
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;; Dependencies
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(require 'alert)
(require 'cycle)
(require 'dash)
(require 'kbd)
(require 's)
(require 'exwm)
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;; Variables
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(defgroup window-manager nil
"Customization options for `window-manager'.")
(cl-defstruct window-manager-named-workspace
label kbd display)
(defcustom window-manager-named-workspaces nil
"List of `window-manager-named-workspace' structs."
:group 'window-manager
:type (list 'window-manager-named-workspace))
(defcustom window-manager-screenlocker "xsecurelock"
"Reference to a screen-locking executable."
:group 'window-manager
:type 'string)
(defvar window-manager--workspaces nil
"Cycle of the my EXWM workspaces.")
(defconst window-manager--modes
(cycle-from-list (list #'window-manager--char-mode
#'window-manager--line-mode))
"Functions to switch exwm modes.")
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;; Library
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(defun window-manager--alert (x)
"Message X with a structured format."
(alert (s-concat "[exwm] " x)))
(cl-defun window-manager-init (&key init-hook)
"Call `exwm-enable' alongside other bootstrapping functions."
(require 'exwm-config)
(require 'exwm-randr)
(setq exwm-randr-workspace-monitor-plist
(->> window-manager-named-workspaces
(-map-indexed (lambda (i x)
(list i (window-manager-named-workspace-display x))))
-flatten))
(setq exwm-workspace-number (length window-manager-named-workspaces))
(setq exwm-input-simulation-keys
'(([?\C-b] . [left])
([?\M-b] . [C-left])
([?\C-f] . [right])
([?\M-f] . [C-right])
([?\C-p] . [up])
([?\C-n] . [down])
([?\C-a] . [home])
([?\C-e] . [end])
([?\C-d] . [delete])
([?\C-c] . [C-c])))
;; Install workspace KBDs
(progn
(->> window-manager-named-workspaces
(list-map #'window-manager--register-kbd))
(window-manager--alert "Registered workspace KBDs!"))
;; Ensure exwm apps open in char-mode.
(add-hook 'exwm-manage-finish-hook #'window-manager--char-mode)
(add-hook 'exwm-init-hook init-hook)
(setq window-manager--workspaces
(cycle-from-list window-manager-named-workspaces))
(exwm-randr-enable)
(exwm-enable))
(defun window-manager-next-workspace ()
"Cycle forwards to the next workspace."
(interactive)
(window-manager--change-workspace (cycle-next window-manager--workspaces)))
(defun window-manager-prev-workspace ()
"Cycle backwards to the previous workspace."
(interactive)
(window-manager--change-workspace (cycle-prev window-manager--workspaces)))
;; Here is the code required to toggle EXWM's modes.
(defun window-manager--line-mode ()
"Switch exwm to line-mode."
(call-interactively #'exwm-input-grab-keyboard)
(window-manager--alert "Switched to line-mode"))
(defun window-manager--char-mode ()
"Switch exwm to char-mode."
(call-interactively #'exwm-input-release-keyboard)
(window-manager--alert "Switched to char-mode"))
(defun window-manager-toggle-mode ()
"Switch between line- and char- mode."
(interactive)
(with-current-buffer (window-buffer)
(when (eq major-mode 'exwm-mode)
(funcall (cycle-next window-manager--modes)))))
(defun window-manager--label->index (label workspaces)
"Return the index of the workspace in WORKSPACES named LABEL."
(let ((index (-elem-index label (-map #'window-manager-named-workspace-label
workspaces))))
(if index index (error (format "No workspace found for label: %s" label)))))
(defun window-manager--register-kbd (workspace)
"Registers a keybinding for WORKSPACE struct.
Currently using super- as the prefix for switching workspaces."
(let ((handler (lambda ()
(interactive)
(window-manager--switch
(window-manager-named-workspace-label workspace))))
(key (window-manager-named-workspace-kbd workspace)))
(exwm-input-set-key
(kbd-for 'workspace key)
handler)))
(defun window-manager--change-workspace (workspace)
"Switch EXWM workspaces to the WORKSPACE struct."
(exwm-workspace-switch
(window-manager--label->index
(window-manager-named-workspace-label workspace)
window-manager-named-workspaces))
(window-manager--alert
(format "Switched to: %s"
(window-manager-named-workspace-label workspace))))
(defun window-manager--switch (label)
"Switch to a named workspaces using LABEL."
(cycle-focus (lambda (x)
(equal label
(window-manager-named-workspace-label x)))
window-manager--workspaces)
(window-manager--change-workspace (cycle-current window-manager--workspaces)))
(defun window-manager-toggle-previous ()
"Focus the previously active EXWM workspace."
(interactive)
(window-manager--change-workspace
(cycle-focus-previous! window-manager--workspaces)))
(defun window-manager--exwm-buffer? (x)
"Return t if buffer X is an EXWM buffer."
(equal 'exwm-mode (buffer-local-value 'major-mode x)))
(defun window-manager--application-name (buffer)
"Return the name of the application running in the EXWM BUFFER.
This function asssumes that BUFFER passes the `window-manager--exwm-buffer?'
predicate."
(with-current-buffer buffer exwm-class-name))
;; TODO: Support disambiguating between two or more instances of the same
;; application. For instance if two `exwm-class-name' values are
;; "Google-chrome", find a encode this information in the `buffer-alist'.
(defun window-manager-switch-to-exwm-buffer ()
"Use `completing-read' to focus an EXWM buffer."
(interactive)
(let* ((buffer-alist (->> (buffer-list)
(-filter #'window-manager--exwm-buffer?)
(-map
(lambda (buffer)
(cons (window-manager--application-name buffer)
buffer)))))
(label (completing-read "Switch to EXWM buffer: " buffer-alist)))
(exwm-workspace-switch-to-buffer
(al-get label buffer-alist))))
(defun window-manager-current-workspace ()
"Output the label of the currently active workspace."
(->> window-manager--workspaces
cycle-current
window-manager-named-workspace-label))
(defun window-manager-workspace-move ()
"Prompt the user to move the current workspace to another."
(interactive)
(exwm-workspace-move
exwm-workspace--current
(window-manager--label->index
(completing-read "Move current workspace to: "
(->> window-manager-named-workspaces
(-map #'window-manager-named-workspace-label))
nil
t)
window-manager-named-workspaces)))
(provide 'window-manager)
;;; window-manager.el ends here
