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hycontrol.el
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;;; hycontrol.el --- Interactive sizing, moving, replicating and deleting of windows and frames -*- lexical-binding: t; -*-
;;
;; Author: Bob Weiner
;;
;; Orig-Date: 1-Jun-16 at 15:35:36
;; Last-Mod: 22-Feb-25 at 09:41:32 by Bob Weiner
;;
;; SPDX-License-Identifier: GPL-3.0-or-later
;;
;; Copyright (C) 2016-2024 Free Software Foundation, Inc.
;; See the "HY-COPY" file for license information.
;;
;; This file is part of GNU Hyperbole.
;;; Commentary:
;;
;; This library provides full interactive control of window and
;; frame sizes and locations utilizing quick single key commands.
;; It has the ability to change from increasing a window height by
;; 5 lines, {.5 h}, to moving a frame 82 pixels, {.82 right-arrow},
;; with just a few keystrokes (the leading . just resets the numeric
;; argument to 0 prior to typing the new number).
;;
;; See the Info manual entry "(hyperbole)HyControl" for reference
;; documentation. See below for key usage information.
;;
;; ----
;;
;; HyControl is invoked via either of two global minor modes under
;; the Hyperbole screen menu, both of which can toggle to the other
;; by pressing {t}. `hycontrol-enable-frames-mode' bound to {C-h h s
;; f} manages visible frame creation, deletion, sizing, position and
;; face zooming (enlarging and shrinking); if called interactively,
;; it stores the current frame configuration for restoration via a
;; press of the `)' key. `hycontrol-enable-windows-mode' manages
;; per frame window creation, deletion, sizing, reframing and face
;; zooming; if called interactively, it stores the current window
;; configuration for restoration via a press of the `)' key.
;; `hycontrol-enable-windows-mode' is typically bound by Hyperbole
;; to {C-c \ } or just use {C-h h s w}. Then press {t} if you want
;; to switch to frame control.
;;
;; With a HyControl minor mode active, a multi-line help summary of
;; most available key bindings is shown in the minibuffer. Simply
;; read this and try each command out to get a feel for it. Below
;; we highlight some of the most unique commands.
;;
;; ----
;;
;; In either HyControl mode, you can instantly create a grid of
;; windows to display many buffers by choosing a number of rows as
;; your first digit, then a number of columns of windows as the
;; second digit and then pressing {@}, e.g. {.26 @} produces 2 rows,
;; each with 6 columns of windows in the selected frame. Grids can
;; be from 1x1 to 9x9 windows. This command also works outside of a
;; HyControl mode when in Dired, Buffer Menu or IBuffer modes with
;; a prefix argument (no preceding period).
;;
;; The buffers displayed by the {@} command are chosen smartly.
;; With a current buffer in Dired, Buffer Menu or IBuffer mode with
;; marked items, the buffers associated with those items are
;; displayed first. Then the most recently used buffers are
;; displayed in each window, first selecting from buffers which
;; match any of the predicate expressions in
;; `hycontrol-display-buffer-predicate-list'. Then, if there are
;; not enough buffers for all windows, the buffers that failed to
;; match to any predicate are used. The default predicate list
;; chooses buffers with attached files. In all cases, buffers whose
;; names start with a space are filtered out. If a prefix argument
;; of 0 is given, a major mode symbol is prompted for and buffers
;; with that major mode are preferred for display instead of those
;; matching the predicate list.
;;
;; ----
;;
;; HyControl allows placement of frames at screen edges and corners
;; using the keys of the numeric keypad, matching their physical
;; layout, e.g. {3} moves to the lower right corner. Press {p} for
;; a prompt with a virtual numeric keypad if you lack a physical one.
;; You can also cycle through all of these placement positions with
;; the {c} key.
;;
;; HyControl can rapidly resize frames to common percentages of
;; screen sizes via a number of commands. Each press of {a} or {A}
;; cycles through resizing the selected frame's width and height
;; respectively to a percentage of the screen given by the lists,
;; `hycontrol-frame-widths' and `hycontrol-frame-heights', e.g. 25%,
;; 50%, etc. The keys: {i} top, {j} left, {k} right, and {m}
;; bottom, first maximize a frame to the respective screen edge and
;; then with successive presses, shrink the frame dimension
;; perpendicular to that edge by 50% while keeping the original edge
;; fixed in place. Try them and you will quickly see how they can
;; help.
;;
;; ----
;;
;; When HyControl creates a new frame, it automatically sizes it to the
;; same size as the previously selected frame and offsets it from that
;; frame by the (X . Y) number of pixels given in the variable,
;; `hycontrol-frame-offset'.
;;
;; A display screen may span multiple physical monitors. To prevent
;; widgets and toolbars at the corners of the screen from being
;; obscured, HyControl can offset each frame from each screen edge
;; by a fixed number of pixels. These offsets are specified by the
;; variable, `hycontrol-screen-offset-alist' and can differ for each
;; type of screen; see its documentation for details. If you change
;; its value, then call `hycontrol-set-screen-offsets' to set any
;; new offset values. `hycontrol-get-screen-offsets' returns the
;; list of offsets in clockwise order starting from the top edge.
;;
;; ----
;;
;; Please note that the frame zoom in/out commands on Z and z will
;; not work unless you have the separately available "zoom-frm.el"
;; library (which itself requires another library). If not available,
;; this command will just beep at you. The window-based zoom commands
;; utilize a built-in Emacs library, so they will always work under
;; any window system. These commands enlarge and shrink the default
;; text face.
;;; Code:
;;; ************************************************************************
;;; Other required Elisp libraries
;;; ************************************************************************
(require 'cl-lib)
(require 'hhist) ; To store frame-config when hycontrol-windows-grid is used
(require 'hypb)
;; Avoid any potential library name conflict by giving the load directory.
(require 'set (expand-file-name "set" hyperb:dir))
(eval-and-compile
;; Get from: https://github.com/emacsmirror/framemove/blob/master/framemove.el
(require 'framemove nil t)
(require 'windmove))
;; Frame face enlarging/shrinking (zooming) requires this separately available library.
;; Everything else works fine without it, so don't make it a required dependency.
;; It also requires the separate library, 'frame-cmds', so ignore any
;; errors if that library is not found as well.
(ignore-errors
(require 'zoom-frm nil t))
;;; ************************************************************************
;;; Public declarations
;;; ************************************************************************
(declare-function fm-next-frame "ext:framemove")
(defvar frame-zoom-font-difference)
(defvar hyperbole-mode-map) ; "hyperbole.el"
(defvar org-mode-map) ; "org.el"
(defvar outline-mode-map) ; "outline.el"
(defvar outline-minor-mode-map) ; "outline.el"
(declare-function kbd-key:key-series-to-events "hib-kbd")
;;; ************************************************************************
;;; Public variables
;;; ************************************************************************
(defvar hycontrol-debug nil
"Whether some HyControl functions log debugging messages to *Messages*.")
(defvar hycontrol-display-buffer-predicate-list
;; Display only buffers attached to files.
(list #'hypb:buffer-file-name)
"List of single buffer/name predicates.
If any predicate returns non-nil for a buffer, include that buffer in
the list to display in the windows created by `hycontrol-windows-grid'.
A predicate may be either a function that takes a single buffer
argument or a boolean expression, in which case the expression is
evaluated with the buffer argument as the current buffer, e.g. (eq
major-mode \\='c-mode).")
(defcustom hycontrol-help-flag t
"*Non-nil means show key binding help in the minibuffer when in a HyControl mode."
:type 'boolean
:group 'hyperbole-screen)
(defcustom hycontrol-invert-mode-line-flag t
"*Non-nil means invert mode-line to emphasize the special key bindings in effect."
:type 'boolean
:group 'hyperbole-screen)
(defcustom hycontrol-keep-window-flag nil
"*Non-nil means leave original window when tear off window to another frame."
:type 'boolean
:group 'hyperbole-screen)
(defcustom hycontrol-maximum-units 1000
"*Maximum units setting allowed for hycontrol commands.
The unit counter resets to the last digit entered whenever this
value is exceeded."
:type '(integer :match (lambda (_widget value)
(and (integerp value) (> value 0)
(<= value (max 1000 (display-pixel-width))))))
:group 'hyperbole-screen)
(defcustom hycontrol-frame-offset '(13 . 23)
"*Increase in offset for new hycontrol frames relative to the selected frame.
Its value is an (x-offset . y-offset) pair in pixels."
:type '(cons integer integer)
:group 'hyperbole-screen)
(defvar hycontrol-screen-offset-alist
'(((1920 . 1080) . (0 10 0 68)) ; 24" iMac HD display
((2560 . 1440) . (0 15 0 93)) ; 27" iMac HD display
(t . (0 0 0 0)))
"*Alist of screen predicate offset pairs.
The format is (screen-predicate . (top-offset right-offset
bottom-offset left-offset).
Offsets are integers given in pixels. The offsets associated with the first
matching screen-predicate are used in HyControl screen edge frame placement
commands; this is set when HyControl is first loaded/used.
Screen-predicate must be one of: a boolean function of no arguments, an
integer dotted pair of (width . height) in pixels to match to, or an Emacs
Lisp boolean form to evaluate.
The final predicate should always be t, for default values, typically of zero.")
(defcustom hycontrol-screen-top-offset 0
"*Pixel offset from top used when placing a frame at a top corner."
:type '(integer :match (lambda (_widget value)
(and (integerp value) (>= value 0)
(< value (display-pixel-height)))))
:group 'hyperbole-screen)
(defcustom hycontrol-screen-right-offset 0
"*Pixel offset from right used when placing a frame at a right corner."
:type '(integer :match (lambda (_widget value)
(and (integerp value) (>= value 0)
(< value (display-pixel-width)))))
:group 'hyperbole-screen)
(defcustom hycontrol-screen-bottom-offset 0
"*Pixel offset from bottom used when placing a frame at a bottom corner."
:type '(integer :match (lambda (_widget value)
(and (integerp value) (>= value 0)
(< value (display-pixel-height)))))
:group 'hyperbole-screen)
(defcustom hycontrol-screen-left-offset 0
"*Pixel offset from left used when placing a frame at a left corner."
:type '(integer :match (lambda (_widget value)
(and (integerp value) (>= value 0)
(< value (display-pixel-width)))))
:group 'hyperbole-screen)
(defcustom hycontrol-blank-buffer-name " BLANK"
"Blank buffer name used for to display in extra window grid windows.
Used after selected buffer list is exhausted. Start name with a space
for it to be omitted by `list-buffers'."
:type 'string
:group 'hyperbole-screen)
(defvar hycontrol-frame-widths
'(1.0 0.75 0.666 0.5 0.333 0.25)
"List of width percentages to cycle through when adjusting a frame's width.
0.75 and 75 are treated as the same percentage.")
(defvar hycontrol-frame-heights
'(1.0 0.75 0.666 0.5 0.333 0.25)
"List of height percentages to cycle through when adjusting a frame's height.
0.75 and 75 are treated as the same percentage.")
(defvar hycontrol-arg nil
"HyControl copy of `prefix-arg' that it changes within key bindings.
`pre-command-hook' synchronizes this value to `prefix-arg'.")
;;; ************************************************************************
;;; Public declarations
;;; ************************************************************************
(defvar ibuffer-mode-map)
;;; Frame Keys
(defvar hycontrol-frames-mode-map
(let ((map (make-sparse-keymap)))
(suppress-keymap map t) ;; Disable self-inserting keys and prefix keys
(define-key map [up] (lambda () (interactive) (hycontrol-move-frame 'up hycontrol-arg)))
(define-key map [down] (lambda () (interactive) (hycontrol-move-frame 'down hycontrol-arg)))
(define-key map [left] (lambda () (interactive) (hycontrol-move-frame 'left hycontrol-arg)))
(define-key map [right] (lambda () (interactive) (hycontrol-move-frame 'right hycontrol-arg)))
(define-key map [kp-0] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-0 hycontrol-arg)))
(define-key map [kp-1] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-1 hycontrol-arg)))
(define-key map [kp-2] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-2 hycontrol-arg)))
(define-key map [kp-3] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-3 hycontrol-arg)))
(define-key map [kp-4] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-4 hycontrol-arg)))
(define-key map [kp-5] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-5 hycontrol-arg)))
(define-key map [kp-6] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-6 hycontrol-arg)))
(define-key map [kp-7] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-7 hycontrol-arg)))
(define-key map [kp-8] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-8 hycontrol-arg)))
(define-key map [kp-9] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-9 hycontrol-arg)))
;; Clear hycontrol-arg
(define-key map "." 'hycontrol-reset-prefix-arg)
(define-key map "@" 'hycontrol-windows-grid)
(define-key map "?" 'hycontrol-toggle-help)
(define-key map "a" 'hycontrol-frame-adjust-widths)
(define-key map "A" 'hycontrol-frame-adjust-heights)
(define-key map "b" 'bury-buffer)
(define-key map "c" 'hycontrol-frame-to-screen-edges)
(define-key map "d" 'delete-frame)
(define-key map "D" 'hycontrol-delete-other-frames)
(define-key map "f" 'hycontrol-clone-window-to-new-frame)
(define-key map "F" 'hycontrol-window-to-new-frame)
(define-key map "\C-g" 'hycontrol-abort)
(define-key map "%" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-percentage-of-screen hycontrol-arg))))
(define-key map "H" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-height-percentage-of-screen hycontrol-arg))))
(define-key map "W" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-width-percentage-of-screen hycontrol-arg))))
(define-key map "h" (lambda () (interactive) (hycontrol-set-frame-height nil (+ (frame-height) hycontrol-arg))))
;; Move directionally among frames
(define-key map "I" 'hycontrol-framemove-up)
(define-key map "J" 'hycontrol-framemove-left)
(define-key map "K" 'hycontrol-framemove-right)
(define-key map "M" 'hycontrol-framemove-down)
(define-key map "i" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-top hycontrol-arg))))
(define-key map "j" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-left hycontrol-arg))))
(define-key map "k" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-right hycontrol-arg))))
(define-key map "l" 'lower-frame)
(define-key map "m" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-bottom hycontrol-arg))))
(define-key map "n" (lambda () (interactive) (hycontrol-set-frame-width nil (- (frame-width) hycontrol-arg))))
(define-key map "o" (lambda () (interactive) (let ((w (selected-window))) (other-window hycontrol-arg) (if (eq w (selected-window)) (other-window 1)))))
(define-key map "O" (lambda () (interactive) (let ((w (selected-window))) (other-frame hycontrol-arg) (if (eq w (selected-window)) (other-frame 1)))))
;; Numeric keypad emulation for keyboards that lack one.
(define-key map "p" (lambda () (interactive) (hycontrol-virtual-numeric-keypad hycontrol-arg)))
(define-key map "q" 'hycontrol-quit)
(define-key map "Q" 'hycontrol-quit)
(define-key map "r" 'raise-frame)
(define-key map "s" (lambda () (interactive) (hycontrol-set-frame-height nil (- (frame-height) hycontrol-arg))))
(define-key map "t" 'hycontrol-enable-windows-mode)
(define-key map "u" 'unbury-buffer)
(define-key map "w" (lambda () (interactive) (hycontrol-set-frame-width nil (+ (frame-width) hycontrol-arg))))
(define-key map "Z" (lambda () (interactive) (if (> hycontrol-arg 9) (setq hycontrol-arg 1)) (hycontrol-frame-zoom 'zoom-frm-in hycontrol-arg hycontrol-debug)))
(define-key map "z" (lambda () (interactive) (if (> hycontrol-arg 9) (setq hycontrol-arg 1)) (hycontrol-frame-zoom 'zoom-frm-out hycontrol-arg hycontrol-debug)))
(define-key map "\[" 'hycontrol-make-frame)
(define-key map "\]" 'hycontrol-make-frame)
(define-key map "\(" 'hycontrol-save-frame-configuration)
(define-key map "\)" 'hycontrol-restore-frame-configuration)
;; Something in this command's event handling when used within HyControl's event loop slows down
;; frame iconification under macOS 100-fold, so don't enable it until this issue is resolved.
;; (define-key map "^" 'iconify-frame)
(define-key map "~" (lambda () (interactive)
(unless (hycontrol-frame-swap-buffers)
(hycontrol-user-error hycontrol-debug "(HyControl): There must be at least two frames and the frame to swap to must have only a single window."))))
(define-key map "-" 'hycontrol-minus-key)
(define-key map "+" 'toggle-frame-maximized)
(define-key map "=" (lambda () (interactive)
(and (> (length (visible-frame-list)) 1)
(y-or-n-p "Resize all other frames to the size of the selected frame?")
(mapc (lambda (f)
(hycontrol-set-frame-size
f (frame-pixel-width) (frame-pixel-height) t))
(visible-frame-list)))))
(define-key map "\C-u" 'hycontrol-multiply-universal-arg)
(define-key map "0" (lambda () (interactive) (hycontrol-universal-arg-digit 0)))
(define-key map "1" (lambda () (interactive) (hycontrol-universal-arg-digit 1)))
(define-key map "2" (lambda () (interactive) (hycontrol-universal-arg-digit 2)))
(define-key map "3" (lambda () (interactive) (hycontrol-universal-arg-digit 3)))
(define-key map "4" (lambda () (interactive) (hycontrol-universal-arg-digit 4)))
(define-key map "5" (lambda () (interactive) (hycontrol-universal-arg-digit 5)))
(define-key map "6" (lambda () (interactive) (hycontrol-universal-arg-digit 6)))
(define-key map "7" (lambda () (interactive) (hycontrol-universal-arg-digit 7)))
(define-key map "8" (lambda () (interactive) (hycontrol-universal-arg-digit 8)))
(define-key map "9" (lambda () (interactive) (hycontrol-universal-arg-digit 9)))
map)
"Keymap to use when in Hyperbole HyControl frames mode.")
;;; Window Keys
;;;###autoload
(eval-after-load "buff-menu" '(define-key Buffer-menu-mode-map "@" 'hycontrol-windows-grid))
;;;###autoload
(eval-after-load "ibuffer" '(define-key ibuffer-mode-map "@" 'hycontrol-windows-grid))
;;;###autoload
(eval-after-load "dired" '(define-key dired-mode-map "@" 'hycontrol-windows-grid))
(defvar hycontrol-windows-mode-map
(let ((map (make-sparse-keymap)))
(suppress-keymap map t) ;; Disable self-inserting keys and prefix keys
(define-key map [up] (lambda () (interactive) (hycontrol-move-frame 'up hycontrol-arg)))
(define-key map [down] (lambda () (interactive) (hycontrol-move-frame 'down hycontrol-arg)))
(define-key map [left] (lambda () (interactive) (hycontrol-move-frame 'left hycontrol-arg)))
(define-key map [right] (lambda () (interactive) (hycontrol-move-frame 'right hycontrol-arg)))
(define-key map [kp-0] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-0 hycontrol-arg)))
(define-key map [kp-1] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-1 hycontrol-arg)))
(define-key map [kp-2] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-2 hycontrol-arg)))
(define-key map [kp-3] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-3 hycontrol-arg)))
(define-key map [kp-4] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-4 hycontrol-arg)))
(define-key map [kp-5] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-5 hycontrol-arg)))
(define-key map [kp-6] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-6 hycontrol-arg)))
(define-key map [kp-7] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-7 hycontrol-arg)))
(define-key map [kp-8] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-8 hycontrol-arg)))
(define-key map [kp-9] (lambda () (interactive) (hycontrol-numeric-keypad 'kp-9 hycontrol-arg)))
;; Clear hycontrol-arg
(define-key map "." 'hycontrol-reset-prefix-arg)
(define-key map "@" 'hycontrol-windows-grid)
(define-key map "?" 'hycontrol-toggle-help)
(define-key map "a" 'hycontrol-frame-adjust-widths)
(define-key map "A" 'hycontrol-frame-adjust-heights)
(define-key map "b" 'bury-buffer)
(define-key map "c" 'hycontrol-frame-to-screen-edges)
(define-key map "d" 'delete-window)
(define-key map "D" 'hycontrol-delete-other-windows)
(define-key map "f" 'hycontrol-clone-window-to-new-frame)
(define-key map "F" 'hycontrol-window-to-new-frame)
(define-key map "\C-g" 'hycontrol-abort)
(define-key map "h" (lambda () (interactive) (enlarge-window hycontrol-arg)))
;; Move directionally among windows within current frame
(define-key map "I" 'windmove-up)
(define-key map "J" 'windmove-left)
(define-key map "K" 'windmove-right)
(define-key map "M" 'windmove-down)
;; Allow frame resizing even when in window control mode because
;; it may be used often.
(define-key map "i" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-top hycontrol-arg))))
(define-key map "j" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-left hycontrol-arg))))
(define-key map "k" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-right hycontrol-arg))))
(define-key map "m" (lambda () (interactive) (setq hycontrol-arg (hycontrol-frame-resize-to-bottom hycontrol-arg))))
(define-key map "n" (lambda () (interactive) (shrink-window-horizontally hycontrol-arg)))
(define-key map "o" (lambda () (interactive) (let ((w (selected-window))) (other-window hycontrol-arg) (if (eq w (selected-window)) (other-window 1)))))
(define-key map "O" (lambda () (interactive) (let ((w (selected-window))) (other-frame hycontrol-arg) (if (eq w (selected-window)) (other-frame 1)))))
;; Numeric keypad emulation for keyboards that lack one.
(define-key map "p" (lambda () (interactive) (hycontrol-virtual-numeric-keypad hycontrol-arg)))
(define-key map "q" 'hycontrol-quit)
(define-key map "Q" 'hycontrol-quit)
(define-key map "s" (lambda () (interactive) (shrink-window hycontrol-arg)))
(define-key map "t" 'hycontrol-enable-frames-mode)
(define-key map "u" 'unbury-buffer)
(define-key map "w" (lambda () (interactive) (enlarge-window-horizontally hycontrol-arg)))
(define-key map "Z" (lambda () (interactive) (if (fboundp 'text-scale-increase)
;; Emacs autoloaded function
(text-scale-increase (if (< hycontrol-arg 10) hycontrol-arg (setq hycontrol-arg 1))))))
(define-key map "z" (lambda () (interactive) (if (fboundp 'text-scale-decrease)
;; Emacs autoloaded function
(text-scale-decrease (if (< hycontrol-arg 10) hycontrol-arg (setq hycontrol-arg 1))))))
;; Don't call these interactively because a prefix arg of 1 tries
;; to make one window 1 line tall.
(define-key map "[" (lambda () (interactive) (split-window-vertically)))
(define-key map "]" (lambda () (interactive) (split-window-horizontally)))
(define-key map "(" 'hycontrol-save-frame-configuration)
(define-key map ")" 'hycontrol-restore-frame-configuration)
(define-key map "~" (lambda () (interactive)
(unless (hycontrol-window-swap-buffers)
(hycontrol-user-error hycontrol-debug "(HyControl): There must be precisely two windows within the selected frame to swap buffers."))))
(define-key map "-" 'hycontrol-minus-key)
(define-key map "+" 'hycontrol-window-maximize-lines)
(define-key map "=" (lambda () (interactive) (and (> (length (window-list)) 1)
(y-or-n-p "Resize windows evenly across this frame?")
(balance-windows))))
(define-key map "\C-u" 'hycontrol-multiply-universal-arg)
(define-key map "0" (lambda () (interactive) (hycontrol-universal-arg-digit 0)))
(define-key map "1" (lambda () (interactive) (hycontrol-universal-arg-digit 1)))
(define-key map "2" (lambda () (interactive) (hycontrol-universal-arg-digit 2)))
(define-key map "3" (lambda () (interactive) (hycontrol-universal-arg-digit 3)))
(define-key map "4" (lambda () (interactive) (hycontrol-universal-arg-digit 4)))
(define-key map "5" (lambda () (interactive) (hycontrol-universal-arg-digit 5)))
(define-key map "6" (lambda () (interactive) (hycontrol-universal-arg-digit 6)))
(define-key map "7" (lambda () (interactive) (hycontrol-universal-arg-digit 7)))
(define-key map "8" (lambda () (interactive) (hycontrol-universal-arg-digit 8)))
(define-key map "9" (lambda () (interactive) (hycontrol-universal-arg-digit 9)))
map)
"Keymap to use when in Hyperbole HyControl window mode.")
;;; ************************************************************************
;;; Public declarations
;;; ************************************************************************
(declare-function ibuffer-get-marked-buffers "ibuffer")
(declare-function which-key--hide-popup-ignore-command "ext:which-key")
;;; ************************************************************************
;;; Private variables
;;; ************************************************************************
(defvar hycontrol--frames-prompt-format
(concat "FRAMES: (h=heighten, s=shorten, w=widen, n=narrow, %%/H/W=screen %%age, arrow=move frame) by %d unit%s, .=clear units\n"
;; d/^/D=delete/iconify frame/others - iconify left out due to some bug on macOS (see comment near ^ below)
"a/A=cycle adjust width/height, d/D=delete frame/others, o/O=other win/frame, I/J/K/M=to frame, [/]=create frame, (/)=save/restore fconfig\n"
"@=grid of wins, f/F=clone/move win to new frame, -/+=minimize/maximize frame, ==frames same size, u/b/~=un/bury/swap bufs\n"
"Frame to edges: c=cycle, i/j/k/m=expand/contract, p/num-keypad=move; z/Z=zoom out/in, t=to WINDOWS mode, Q=quit")
"HyControl frames-mode minibuffer prompt string to pass to format.
Format it with 2 arguments: `prefix-arg' and a plural string indicating if
`prefix-arg' is not equal to 1.")
(defvar hycontrol--windows-prompt-format
(concat
"WINDOWS: (h=heighten, s=shorten, w=widen, n=narrow, arrow=move frame) by %d unit%s, .=clear units\n"
"a/A=cycle adjust frame width/height, d/D=delete win/others, o/O=other win/frame, I/J/K/M=to window, [/]=split win atop/sideways, (/)=save/restore wconfig\n"
"@=grid of wins, f/F=clone/move win to new frame, -/+=minimize/maximize win, ==wins same size, u/b/~=un/bury/swap bufs\n"
"Frame to edges: c=cycle, i/j/k/m=expand/contract, p/num-keypad=move; z/Z=zoom out/in, t=to FRAMES mode, Q=quit")
"HyControl windows-mode minibuffer prompt string to pass to format.
Format it with 2 arguments: `prefix-arg' and a plural string indicating if
`prefix-arg' is not equal to 1.")
(defvar hycontrol--prompt-format nil
"The current HyControl mode help format string or nil if not active.")
(defvar hycontrol--exit-status nil
"Internal HyControl status indicator of how it was exited.
After exit, it should be one of the following symbols triggered by the
associated key: quit {q}, abort {\\`C-g'}, or toggle {t}.")
(defvar hycontrol--fconfig nil
"Used to store a frame configuration while in hycontrol.")
(defvar hycontrol--wconfig nil
"Used to store a window configuration while in hycontrol.")
(defvar hycontrol--invert-display-buffer-predicates nil)
(defvar hycontrol--quit-function nil
"Store function to remove the transient-map later.
The function is auto-generated by a call to `set-transient-map'")
(defvar hycontrol--screen-edge-position 0
"Cycles between 0-7 representing corner and center edge positions.
The cycle is in clockwise order from the upper left corner.")
(defvar hycontrol--frame-widths-pointer nil)
(defvar hycontrol--frame-heights-pointer nil)
(defvar hycontrol--buffer-list nil)
(defvar hycontrol--buffer-list-pointer nil)
(defvar hycontrol--initial-which-key-inhibit nil
"Store value of `which-key-inhibit' flag from \"which-key\" package, if any.
Used on entry to HyControl.")
;;; ************************************************************************
;;; Private functions
;;; ************************************************************************
(defsubst hycontrol-windows-grid-valid-size-p (grid-size)
(when grid-size
(and (setq grid-size (prefix-numeric-value grid-size))
(integerp grid-size) (>= grid-size 11) (<= grid-size 99)
(not (zerop (% grid-size 10))))))
;;; HyControl private per keyboard key functions
(defun hycontrol-pre-command-hook ()
"Added to `pre-command-hook' while in any HyControl mode."
(when (null hycontrol-arg) (setq hycontrol-arg 1))
(setq prefix-arg hycontrol-arg))
(defun hycontrol-post-command-hook ()
"Added to `post-command-hook' while in HyControl frames mode."
(when (null hycontrol-arg) (setq hycontrol-arg 1))
(if (zerop (minibuffer-depth))
(if hycontrol-help-flag
(let ((message-log-max nil) ; prevent logging of HyControl help messages
(resize-mini-windows t) ; automatically shrink
(use-dialog-box)) ; prevent y-or-n dialog boxes
(message hycontrol--prompt-format hycontrol-arg (if (= hycontrol-arg 1) "" "s"))))
;; Quit from HyControl at any minibuffer prompt so that
;; self-insert-keys work for typing at the prompt.
(hycontrol-disable-modes)))
(defun hycontrol-end-mode ()
"Prepare to abort or quit from HyControl."
(interactive)
(remove-hook 'pre-command-hook 'hycontrol-pre-command-hook)
(remove-hook 'post-command-hook 'hycontrol-post-command-hook)
(if (boundp 'which-key-inhibit)
(setq which-key-inhibit hycontrol--initial-which-key-inhibit))
;; May be called when turning on HyControl before this next function
;; is defined.
(if (functionp hycontrol--quit-function)
(funcall hycontrol--quit-function))
(setq inhibit-quit nil
hycontrol--exit-status t
hycontrol-arg 1
prefix-arg nil
hycontrol-debug nil
hycontrol-frames-mode nil
hycontrol-windows-mode nil
hycontrol--prompt-format nil))
(defun hycontrol-stay-in-mode ()
"Return non-nil if HyControl mode should remain active."
(null hycontrol--exit-status))
(defun hycontrol-invert-prefix-arg ()
"Invert the sign of the current Hycontrol prefix argument.
If the argument is 0, set it to -1."
(interactive)
(setq this-command 'hycontrol-invert-prefix-arg
hycontrol-arg (if (zerop hycontrol-arg) -1 (- hycontrol-arg))))
(defun hycontrol-minus-key ()
"Conditional command to execute when the minus key is pressed."
(interactive)
(cond ((and (symbolp last-command)
(string-match-p "\\`\\(hui:menu-enter\\|hycontrol.*-\\(frames\\|windows\\|prefix\\|universal\\)-\\(mode\\|arg\\)\\)" (symbol-name last-command)))
(hycontrol-invert-prefix-arg))
(hycontrol-frames-mode
(hycontrol-frame-minimize-lines))
(t
(hycontrol-window-minimize-lines))))
(defun hycontrol-multiply-universal-arg ()
"Return prefix arg based on `hycontrol-arg' and one press of the universal arg."
(interactive)
(setq this-command 'hycontrol-multiply-universal-arg
hycontrol-arg (* hycontrol-arg 4))
(when (> (abs hycontrol-arg) hycontrol-maximum-units)
(setq hycontrol-arg (if (< hycontrol-arg 0) -4 4)))
hycontrol-arg)
(defun hycontrol-reset-prefix-arg ()
"Reset HyControl prefix arg to 0."
(interactive)
(setq hycontrol-arg 0)
(hycontrol-frame-to-screen-edges 0))
(defun hycontrol-universal-arg-digit (digit)
"Return the new prefix argument based on existing `hycontrol-arg' and new DIGIT."
(setq this-command 'hycontrol-universal-arg-digit
hycontrol-arg
(if (< hycontrol-arg 0)
(if (and (= hycontrol-arg -1)
(not (zerop digit)))
(- digit)
(- (* hycontrol-arg 10) digit))
(+ (* hycontrol-arg 10) digit)))
(when (> (abs hycontrol-arg) hycontrol-maximum-units)
(setq hycontrol-arg
(if (< hycontrol-arg 0)
(- digit)
digit)))
hycontrol-arg)
;;; HyControl private initialization functions
(defun hycontrol-setup (arg setup-function)
"HyControl initialization; passes through ARG and SETUP-FUNCTION.
SETUP-FUNCTION is HyControl mode-specific."
;; Save status value of which-key help package and quit any
;; in-progress which-key help without any user alert.
(when (boundp 'which-key-inhibit)
(setq hycontrol--initial-which-key-inhibit which-key-inhibit
which-key-inhibit t)
(which-key--hide-popup-ignore-command))
(setq arg (prefix-numeric-value arg)
inhibit-quit t
hycontrol--exit-status nil)
(and hycontrol-debug (not (integerp hycontrol-debug)) (setq hycontrol-debug message-log-max))
(if (called-interactively-p 'interactive) (hycontrol-save-configurations))
(cond ((or (not (integerp arg)) (< arg 1))
(setq arg 1))
((> arg hycontrol-maximum-units)
(setq arg hycontrol-maximum-units)))
(setq hycontrol-arg arg
prefix-arg arg)
(hycontrol-invert-mode-line)
(add-hook 'pre-command-hook 'hycontrol-pre-command-hook)
(add-hook 'post-command-hook 'hycontrol-post-command-hook)
(funcall setup-function))
(defun hycontrol-frames-setup ()
"HyControl frames-specific initializations."
(setq hycontrol--prompt-format hycontrol--frames-prompt-format)
(hycontrol-post-command-hook)
;; Use normal event loop with transient-map until {C-g} or {q} is
;; pressed, then exit.
(setq hycontrol--quit-function
(set-transient-map hycontrol-frames-mode-map #'hycontrol-stay-in-mode)))
(defun hycontrol-frames (&optional arg)
"Interactively delete, jump to, move, replicate, and resize frames.
With optional numeric prefix ARG, move and resize by ARG (an
integer) units. If ARG is < 1, it is set to 1. If it is >
`hycontrol-maximum-units', it is set to `hycontrol-maximum-units'."
(interactive "p")
(hycontrol-setup arg #'hycontrol-frames-setup)
(unless hycontrol-help-flag
(message "(HyControl) Frames global minor mode enabled; use {%s} for help"
(hycontrol-help-key-description))))
(defun hycontrol-windows-setup ()
"HyControl windows-specific initializations."
(setq hycontrol--prompt-format hycontrol--windows-prompt-format)
(hycontrol-post-command-hook)
;; Use normal event loop with transient-map until {C-g} or {q} is
;; pressed, then exit.
(setq hycontrol--quit-function
(set-transient-map hycontrol-windows-mode-map #'hycontrol-stay-in-mode)))
(defun hycontrol-windows (&optional arg)
"Interactively delete, jump to, rebalance, resize, and split windows.
With optional numeric prefix ARG, move and resize by ARG (an
integer) units. If ARG is < 1, it is set to 1. If it is >
`hycontrol-maximum-units', it is set to `hycontrol-maximum-units'."
(interactive "p")
(hycontrol-setup arg #'hycontrol-windows-setup)
(unless hycontrol-help-flag
(message "(HyControl) Windows global minor mode enabled; use {%s} for help"
(hycontrol-help-key-description))))
;;; HyControl general private functions
(defsubst hycontrol-frame-edges (&optional frame)
"Return the outermost edge coordinates of optional or selected FRAME.
FRAME must be a live frame and defaults to the selected one. The
list returned has the form (Left Top Right Bottom) where all
values are in pixels relative to the origin - the position (0, 0)
- of FRAME’s display. For terminal frames all values are
relative to Left and Top which are both zero."
(frame-edges frame 'outer-edges))
(defsubst hycontrol-frame-x-origin (&optional frame)
"Return the X origin coordinate of optional FRAME or the selected frame.
This includes all graphical window manager decorations. The X
origin coordinate is the upper left point. Under a graphical
window system, this is in pixels; otherwise, it is in characters."
(nth 0 (hycontrol-frame-edges frame)))
(defsubst hycontrol-frame-y-origin (&optional frame)
"Return the Y origin coordinate of optional FRAME or the selected frame.
This includes all graphical window manager decorations. The Y
origin coordinate is the upper left point. Under a graphical
window system, this is in pixels; otherwise, it is in characters."
(nth 1 (hycontrol-frame-edges frame)))
(defun hycontrol-frame-height (&optional frame)
"Return the height of optional FRAME or the selected frame.
This includes all graphical window manager decorations. Under a
graphical window system, this is in pixels; otherwise, it is in
characters."
(frame-pixel-height frame))
(defun hycontrol-frame-width (&optional frame)
"Return the width of optional FRAME or the selected frame.
This includes all graphical window manager decorations. Under a
graphical window system, this is in pixels; otherwise, it is in
characters."
(frame-pixel-width frame))
;; Frame Resizing Support
(defconst hycontrol-screen-offset-sensitivity 12
"Screen edge sensitivity in pixels.
Number of pixels a frame dimension can be off from its
screen-offset and still be considered at the screen edge.")
(defun hycontrol-frame-at-left-p ()
"Non-nil if selected frame's left edge is at the left edge of the screen.
Screen left edge is adjusted based on `hycontrol-screen-left-offset'."
(<= (- (nth 0 (hycontrol-frame-edges)) hycontrol-screen-left-offset)
hycontrol-screen-offset-sensitivity))
(defun hycontrol-frame-at-top-p ()
"Non-nil if selected frame's bottom is at the top of the screen.
Screen top is adjusted based on `hycontrol-screen-top-offset'."
(<= (- (nth 1 (hycontrol-frame-edges)) hycontrol-screen-top-offset
;; Under macOS, frames are automatically offset vertically by
;; the height of the global menubar, so account for that.
(if (eq system-type 'darwin) 23 0))
hycontrol-screen-offset-sensitivity))
(defun hycontrol-frame-at-right-p ()
"Non-nil if selected frame's right edge is at the right edge of the screen.
Screen right edge is adjusted based on `hycontrol-screen-right-offset'."
(<= (- (display-pixel-width) (nth 2 (hycontrol-frame-edges)) hycontrol-screen-right-offset)
hycontrol-screen-offset-sensitivity))
(defun hycontrol-frame-at-bottom-p ()
"Non-nil if selected frame's bottom is at the bottom of the screen.
Screen bottom edge is adjusted based on `hycontrol-screen-bottom-offset'."
(<= (- (display-pixel-height) (nth 3 (hycontrol-frame-edges)) hycontrol-screen-bottom-offset
;; Under macOS, frames are automatically offset vertically by
;; the height of the global menubar, so account for that.
(if (eq system-type 'darwin) -23 0))
hycontrol-screen-offset-sensitivity))
;; Frame Zoom Support
(defun hycontrol-frame-zoom (zoom-func arg max-msgs)
"Zoom default frame face using ZOOM-FUNC and amount ARG (must be 1-9).
MAX-MSGS is a number used only if ZOOM-FUNC is undefined and an
error message is logged."
(if (fboundp zoom-func)
(let ((frame-zoom-font-difference arg))
(funcall zoom-func))
(hycontrol-user-error max-msgs "(HyControl): Zooming requires separate \"zoom-frm.el\" Emacs Lisp library installation")))
(defun hycontrol-make-frame ()
"Create a new frame with the same size and selected buffer as the selected frame.
The new frame is selected. It is offset from the selected frame
by `hycontrol-frame-offset' (x . y) pixels."
(interactive)
(select-frame (make-frame (list (cons 'width (frame-width)) (cons 'height (frame-height))
(cons 'left (+ (car hycontrol-frame-offset) (car (frame-position))))
(cons 'top (+ (cdr hycontrol-frame-offset) (cdr (frame-position))))))))
(defun hycontrol-move-frame (arrow pixels)
(let ((x (car (frame-position)))
(y (cdr (frame-position))))
(pcase arrow
('up (set-frame-position nil x (- y pixels)))
('down (set-frame-position nil x (+ y pixels)))
('left (set-frame-position nil (- x pixels) y))
('right (set-frame-position nil (+ x pixels) y)))))
(defun hycontrol-numeric-keypad (e _arg)
"Move frame to screen location based on the last pressed numeric keypad key E."
(let ((num (if (integerp e)
e
;; kp-<num> symbol
(- (aref (symbol-name e) 3) ?0))))
(funcall
(nth num '(nil hycontrol-frame-to-bottom-left hycontrol-frame-to-bottom-center hycontrol-frame-to-bottom-right
hycontrol-frame-to-left-center hycontrol-frame-to-center hycontrol-frame-to-right-center
hycontrol-frame-to-top-left hycontrol-frame-to-top-center hycontrol-frame-to-top-right)))))
(defun hycontrol-set-frame-height (frame height &optional pretend pixelwise)
"Set text height of frame FRAME to HEIGHT lines and fit it to the screen.
Optional third arg PRETEND non-nil means that redisplay should use
HEIGHT lines but that the idea of the actual height of the frame should
not be changed.
Optional fourth argument PIXELWISE non-nil means that FRAME should be
HEIGHT pixels high. Note: When `frame-resize-pixelwise’ is nil, some
window managers may refuse to honor a HEIGHT that is not an integer
multiple of the default frame font height."
(let ((frame-resize-pixelwise t))
(set-frame-height frame height pretend pixelwise)
(hycontrol-frame-fit-to-screen frame)))
(defun hycontrol-set-frame-position (frame x y)
"Set position of FRAME to (X, Y) and ensure it fits on screen.
FRAME must be a live frame and defaults to the selected one. X and Y,
if positive, specify the coordinate of the left and top edge of FRAME’s
outer frame in pixels relative to an origin (0, 0) of FRAME’s display.
If any of X or Y is negative, it specifies the coordinates of the right
or bottom edge of the outer frame of FRAME relative to the right or
bottom edge of FRAME’s display."
(let ((frame-resize-pixelwise t))
(hycontrol-frame-fit-to-screen frame)
(set-frame-position frame x y)))
(defun hycontrol-set-frame-size (frame width height &optional pixelwise)
"Set text size of FRAME to WIDTH by HEIGHT, measured in characters.
Ensure frame fits within the screen size.
Optional argument PIXELWISE non-nil means to measure in pixels. Note:
When `frame-resize-pixelwise’ is nil, some window managers may refuse to
honor a WIDTH that is not an integer multiple of the default frame font
width or a HEIGHT that is not an integer multiple of the default frame
font height."
(let ((x-origin (hycontrol-frame-x-origin))
(y-origin (hycontrol-frame-y-origin))
(frame-resize-pixelwise t))
(set-frame-size frame width height pixelwise)
(hycontrol-frame-fit-to-screen frame x-origin y-origin)))
(defun hycontrol-set-frame-width (frame width &optional pretend pixelwise)
"Set text width of frame FRAME to WIDTH columns and fit it to the screen.
Optional third arg PRETEND non-nil means that redisplay should use WIDTH
columns but that the idea of the actual width of the frame should not
be changed.
Optional fourth argument PIXELWISE non-nil means that FRAME should be
WIDTH pixels wide. Note: When `frame-resize-pixelwise’ is nil, some
window managers may refuse to honor a WIDTH that is not an integer
multiple of the default frame font width."
(let ((x-origin (hycontrol-frame-x-origin))
(y-origin (hycontrol-frame-y-origin))
(frame-resize-pixelwise t))
(set-frame-width frame width pretend pixelwise)
(hycontrol-frame-fit-to-screen frame x-origin y-origin)))
(defun hycontrol-display-buffer-predicate-results (buffer)
(condition-case err
(mapcar (lambda (expr)
(if (functionp expr)
(funcall expr buffer)
(with-current-buffer buffer
(eval expr))))
hycontrol-display-buffer-predicate-list)
(error "(HyDebug): Invalid expression in `hycontrol-display-buffer-predicate-list' - %s" err)))
(defvar hycontrol--blank-buffer (get-buffer-create hycontrol-blank-buffer-name)
"Blank buffer to display in extra window grid windows.
Used after selected buffer list is exhausted.")
(defun hycontrol-window-display-buffer (window)
"Given a WINDOW, choose the next appropriate buffer to display.
If WINDOW is dedicated, ignore it and do nothing.
Uses hycontrol--buffer-list'.
When `hycontrol--invert-display-buffer-predicates' is non-nil and not
\\='ignore, the list of buffers used is further filtered using the
functions and sexpressions in `hycontrol-display-buffer-predicate-list',
which by default filters a frame's buffers to just those with attached
files.
Filtering is disabled if a specific list of buffers is sent to the
`hycontrol-make-windows-grid' function that calls this."
(unless (or (null window) (window-dedicated-p window))
(let ((buf (car hycontrol--buffer-list-pointer)))
(setq hycontrol--buffer-list-pointer (cdr hycontrol--buffer-list-pointer))
(while (and buf (or (= (aref (buffer-name buf) 0) ?\ )
(and (not hycontrol--invert-display-buffer-predicates)
(not (eval (cons 'or (hycontrol-display-buffer-predicate-results buf)))))
(and hycontrol--invert-display-buffer-predicates
(not (eq hycontrol--invert-display-buffer-predicates 'ignore))
(eval (cons 'or (hycontrol-display-buffer-predicate-results buf))))))
;; Buffer is not one to display, get the next one and test again.
(setq buf (car hycontrol--buffer-list-pointer)
hycontrol--buffer-list-pointer (cdr hycontrol--buffer-list-pointer)))
(set-window-buffer window
(or buf
;; Out of buffers to display, display a blank one
hycontrol--blank-buffer)))))
(defun hycontrol-window-display-buffer-with-repeats (window)
"This is no longer used since Hyperbole V8. Left here for reference.
Given a WINDOW, choose the next appropriate buffer to display
therein using `hycontrol-display-buffer-predicate-list'. Also
uses the value of`hycontrol--buffer-list' as the list of buffers
to distribute among the windows."
(let ((buf (car hycontrol--buffer-list-pointer)))
(setq hycontrol--buffer-list-pointer (cdr hycontrol--buffer-list-pointer))
(unless buf
;; Now on each new pass through buffer-list, the buffer predicate tests will
;; be inverted to expand the list of allowed buffers because the
;; 1st pass did not produce a buffer for this window.
(setq hycontrol--buffer-list-pointer hycontrol--buffer-list
buf (car hycontrol--buffer-list-pointer)
hycontrol--buffer-list-pointer (cdr hycontrol--buffer-list-pointer))
(unless (eq hycontrol--invert-display-buffer-predicates 'ignore)
(setq hycontrol--invert-display-buffer-predicates (not hycontrol--invert-display-buffer-predicates))))
(while (and buf (or (= (aref (buffer-name buf) 0) ?\ )
(and (not hycontrol--invert-display-buffer-predicates)
(not (eval (cons 'or (hycontrol-display-buffer-predicate-results buf)))))
(and hycontrol--invert-display-buffer-predicates
(not (eq hycontrol--invert-display-buffer-predicates 'ignore))
(eval (cons 'or (hycontrol-display-buffer-predicate-results buf))))))
;; Buffer is not one to display, get the next one and test again.
(setq buf (car hycontrol--buffer-list-pointer)
hycontrol--buffer-list-pointer (cdr hycontrol--buffer-list-pointer)))
(cond (buf
(set-window-buffer window buf))
(t
;; Start 2nd or greater pass through buffer list with predicates inverted.
(hycontrol-window-display-buffer window)))))
(defun hycontrol-message (max-msgs &rest msg-args)
"Log MAX-MSGS, adding MSG-ARGS to the *Messages* buffer log."
(let ((message-log-max max-msgs))
(apply #'message msg-args)))
(defun hycontrol-user-error (max-msgs &rest err)
"Log MAX-MSGS, adding ERR to *Messages* buffer; display ERR for 2 seconds."
(let ((message-log-max max-msgs))
(beep)
(apply #'message err)
(sit-for 2)))
;;; ************************************************************************
;;; Public functions
;;; ************************************************************************
;;; HyControl Global Minor Modes
;;;###autoload
(defun hycontrol-enable-frames-mode (&optional arg)
"Globally enable HyControl Frames mode for rapid Emacs frame control.
Interactively delete, jump to, move, replicate, and resize frames.
With optional numeric prefix ARG, move and resize by ARG (an
integer) units. If ARG is < 1, it is set to 1. If it is >
`hycontrol-maximum-units', it is set to `hycontrol-maximum-units'."