;;; 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.
;; Wish list:
;; - TODO: Support different startup commands and layouts depending on laptop or
;; desktop.
;; - TODO: Support a Music named-workspace.
;;; Code:
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;; Dependencies
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(require 'alert)
(require 'al)
(require 'prelude)
(require 'string)
(require 'cycle)
(require 'set)
(require 'kbd)
(require 'ivy-helpers)
(require 'display)
(require 'vterm-mgt)
(require 'dash)
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;; Library
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;; TODO: Associate `window-purpose' window-layouts with each of these named
;; workspaces.
;; TODO: Associate KBDs for each of these named-layouts.
;; TODO: Decide between window-manager, exwm, or some other namespace.
;; TODO: Support (cycle-from-list '(current previous)) to toggle back and forth
;; between most recent workspace.
;; TODO: Support ad hoc cycle for loading a few workspaces that can be cycled
;; between. (cycle-from-list '("Project" "Workspace"))
;; TODO: Consider supporting a workspace for Racket, Clojure, Common Lisp,
;; Haskell, Elixir, and a few other languages. These could behave very similarly
;; to repl.it, which I've wanted to have locally for awhile now.
;; TODO: Support MRU cache of workspaces for easily switching back-and-forth
;; between workspaces.
(cl-defstruct window-manager--named-workspace label kbd display)
(defgroup window-manager)
(defconst window-manager--install-kbds? t
"When t, install the keybindings to switch between named-workspaces.")
;; TODO: Consume `cache/touch' after changing workspaces. Use this to enable
;; cycling through workspaces.
(defconst window-manager--named-workspaces
(list (make-window-manager--named-workspace
:label "Web Browsing"
:kbd "c"
:display display-4k-horizontal)
(make-window-manager--named-workspace
:label "Coding"
:kbd "d"
:display display-4k-horizontal)
(make-window-manager--named-workspace
:label "Vertical"
:kbd "h"
:display display-4k-vertical)
(make-window-manager--named-workspace
:label "Laptop"
:kbd "p"
:display display-laptop))
"List of `window-manager--named-workspace' structs.")
;; Assert that no two workspaces share KBDs.
(prelude-assert (= (list-length window-manager--named-workspaces)
(->> window-manager--named-workspaces
(list-map #'window-manager--named-workspace-kbd)
set-from-list
set-count)))
(defun window-manager--alert (x)
"Message X with a structured format."
(alert (string-concat "[exwm] " x)))
;; Use Emacs as my primary window manager.
(use-package exwm
:config
(require 'exwm-config)
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;; Multiple Displays
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(require 'exwm-randr)
(exwm-randr-enable)
(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 (list-length window-manager--named-workspaces))
(setq exwm-input-simulation-keys
;; TODO: Consider supporting M-d and other readline style KBDs.
'(([?\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])
;; TODO: Assess whether or not this is a good idea.
;; TODO: Ensure C-c copies.
([?\C-c] . [C-c])))
(exwm-enable))
(defcustom window-manager-screenlocker "xsecurelock"
"Reference to a screen-locking executable."
:group 'window-manager)
;; Here is the code required to allow EXWM to cycle workspaces.
(defconst window-manager--workspaces
(->> window-manager--named-workspaces
cycle-from-list)
"Cycle of the my EXWM workspaces.")
(prelude-assert
(= exwm-workspace-number
(list-length window-manager--named-workspaces)))
(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)))
;; TODO: Create friendlier API for working with EXWM.
;; 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"))
(defconst window-manager--modes
(cycle-from-list (list #'window-manager--char-mode
#'window-manager--line-mode))
"Functions to switch exwm modes.")
(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)))))
;; Ensure exwm apps open in char-mode.
(add-hook 'exwm-manage-finish-hook #'window-manager--char-mode)
;; TODO: How do I handle this dependency?
(defconst window-manager--preferred-browser "google-chrome"
"My preferred web browser.")
;; TODO: Consider replacing the `ivy-read' call with something like `hydra' that
;; can provide a small mode for accepting user-input.
;; TODO: Put this somewhere more diliberate.
(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
(string-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))))
(when window-manager--install-kbds?
(progn
(->> window-manager--named-workspaces
(list-map #'window-manager--register-kbd))
(window-manager--alert "Registered workspace KBDs!")))
(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-swap-workspaces ()
"Prompt the user to switch the current workspace with another."
(interactive)
(let* ((selection (->> window-manager--named-workspaces
(-map #'window-manager--named-workspace-label)
(-reject
(lambda (x)
(s-equals? x (window-manager-current-workspace))))
(completing-read
(format "Swap current workspace (i.e. \"%s\") with: "
(window-manager-current-workspace)))))
(i (-find-index (lambda (x)
(s-equals? selection (window-manager--named-workspace-label x)))
window-manager--named-workspaces)))
(exwm-workspace-swap exwm-workspace--current (elt exwm-workspace--list i))))
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;; Startup Applications in `window-manager--named-workspaces'
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(add-hook 'exwm-init-hook
(lambda ()
;; (display-arrange-primary)
(window-manager--switch "Coding")))
(provide 'window-manager)
;;; window-manager.el ends here
