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;;; hydra-examples.el --- Some applications for Hydra
;; Copyright (C) 2015 Free Software Foundation, Inc.
;; Author: Oleh Krehel
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <>.
;;; Commentary:
;; These are the sample Hydras.
;; If you want to use them plainly, set `hydra-examples-verbatim' to t
;; before requiring this file. But it's probably better to only look
;; at them and use them as templates for building your own.
;;; Code:
(require 'hydra)
;;* Examples
;;** Example 1: text scale
(when (bound-and-true-p hydra-examples-verbatim)
(defhydra hydra-zoom (global-map "<f2>")
("g" text-scale-increase "in")
("l" text-scale-decrease "out")))
;; This example generates three commands:
;; `hydra-zoom/text-scale-increase'
;; `hydra-zoom/text-scale-decrease'
;; `hydra-zoom/body'
;; In addition, two of them are bound like this:
;; (global-set-key (kbd "<f2> g") 'hydra-zoom/text-scale-increase)
;; (global-set-key (kbd "<f2> l") 'hydra-zoom/text-scale-decrease)
;; Note that you can substitute `global-map' with e.g. `emacs-lisp-mode-map' if you need.
;; The functions generated will be the same, except the binding code will change to:
;; (define-key emacs-lisp-mode-map [f2 103]
;; (function hydra-zoom/text-scale-increase))
;; (define-key emacs-lisp-mode-map [f2 108]
;; (function hydra-zoom/text-scale-decrease))
;;** Example 2: move window splitter
(when (bound-and-true-p hydra-examples-verbatim)
(defhydra hydra-splitter (global-map "C-M-s")
("h" hydra-move-splitter-left)
("j" hydra-move-splitter-down)
("k" hydra-move-splitter-up)
("l" hydra-move-splitter-right)))
;;** Example 3: jump to error
(when (bound-and-true-p hydra-examples-verbatim)
(defhydra hydra-error (global-map "M-g")
("h" first-error "first")
("j" next-error "next")
("k" previous-error "prev")
("v" recenter-top-bottom "recenter")
("q" nil "quit")))
;; This example introduces only one new thing: since the command
;; passed to the "q" head is nil, it will quit the Hydra without doing
;; anything. Heads that quit the Hydra instead of continuing are
;; referred to as having blue :color. All the other heads have red
;; :color, unless other is specified.
;;** Example 4: toggle rarely used modes
(when (bound-and-true-p hydra-examples-verbatim)
(defvar whitespace-mode nil)
(kbd "C-c C-v")
(defhydra hydra-toggle-simple (:color blue)
("a" abbrev-mode "abbrev")
("d" toggle-debug-on-error "debug")
("f" auto-fill-mode "fill")
("t" toggle-truncate-lines "truncate")
("w" whitespace-mode "whitespace")
("q" nil "cancel"))))
;; Note that in this case, `defhydra' returns the `hydra-toggle-simple/body'
;; symbol, which is then passed to `global-set-key'.
;; Another new thing is that both the keymap and the body prefix are
;; skipped. This means that `defhydra' will bind nothing - that's why
;; `global-set-key' is necessary.
;; One more new thing is that you can assign a :color to the body. All
;; heads will inherit this color. The code above is very much equivalent to:
;; (global-set-key (kbd "C-c C-v a") 'abbrev-mode)
;; (global-set-key (kbd "C-c C-v d") 'toggle-debug-on-error)
;; The differences are:
;; * You get a hint immediately after "C-c C-v"
;; * You can cancel and call a command immediately, e.g. "C-c C-v C-n"
;; is equivalent to "C-n" with Hydra approach, while it will error
;; that "C-c C-v C-n" isn't bound with the usual approach.
;;** Example 5: mini-vi
(defun hydra-vi/pre ()
(set-cursor-color "#e52b50"))
(defun hydra-vi/post ()
(set-cursor-color "#ffffff"))
(when (bound-and-true-p hydra-examples-verbatim)
(kbd "C-z")
(defhydra hydra-vi (:pre hydra-vi/pre :post hydra-vi/post :color amaranth)
("l" forward-char)
("h" backward-char)
("j" next-line)
("k" previous-line)
("m" set-mark-command "mark")
("a" move-beginning-of-line "beg")
("e" move-end-of-line "end")
("d" delete-region "del" :color blue)
("y" kill-ring-save "yank" :color blue)
("q" nil "quit")))
(hydra-set-property 'hydra-vi :verbosity 1))
;; This example introduces :color amaranth. It's similar to red,
;; except while you can quit red with any binding which isn't a Hydra
;; head, you can quit amaranth only with a blue head. So you can quit
;; this mode only with "d", "y", "q" or "C-g".
;; Another novelty are the :pre and :post handlers. :pre will be
;; called before each command, while :post will be called when the
;; Hydra quits. In this case, they're used to override the cursor
;; color while Hydra is active.
;;** Example 6: selective global bind
(when (bound-and-true-p hydra-examples-verbatim)
(defhydra hydra-next-error (global-map "C-x")
("`" next-error "next")
("j" next-error "next" :bind nil)
("k" previous-error "previous" :bind nil)))
;; This example will bind "C-x `" in `global-map', but it will not
;; bind "C-x j" and "C-x k".
;; You can still "C-x `jjk" though.
;;** Example 7: toggle with Ruby-style docstring
(defvar whitespace-mode nil)
(defhydra hydra-toggle (:color pink)
_a_ abbrev-mode: %`abbrev-mode
_d_ debug-on-error: %`debug-on-error
_f_ auto-fill-mode: %`auto-fill-function
_t_ truncate-lines: %`truncate-lines
_w_ whitespace-mode: %`whitespace-mode
("a" abbrev-mode nil)
("d" toggle-debug-on-error nil)
("f" auto-fill-mode nil)
("t" toggle-truncate-lines nil)
("w" whitespace-mode nil)
("q" nil "quit"))
;; Recommended binding:
;; (global-set-key (kbd "C-c C-v") 'hydra-toggle/body)
;; Here, using e.g. "_a_" translates to "a" with proper face.
;; More interestingly:
;; "foobar %`abbrev-mode" means roughly (format "foobar %S" abbrev-mode)
;; This means that you actually see the state of the mode that you're changing.
;;** Example 8: the whole menu for `Buffer-menu-mode'
(defhydra hydra-buffer-menu (:color pink
:hint nil)
^Mark^ ^Unmark^ ^Actions^ ^Search
^^^^^^^^----------------------------------------------------------------- (__)
_m_: mark _u_: unmark _x_: execute _R_: re-isearch (oo)
_s_: save _U_: unmark up _b_: bury _I_: isearch /------\\/
_d_: delete ^ ^ _g_: refresh _O_: multi-occur / | ||
_D_: delete up ^ ^ _T_: files only: % -28`Buffer-menu-files-only^^ * /\\---/\\
_~_: modified ^ ^ ^ ^ ^^ ~~ ~~
("m" Buffer-menu-mark)
("u" Buffer-menu-unmark)
("U" Buffer-menu-backup-unmark)
("d" Buffer-menu-delete)
("D" Buffer-menu-delete-backwards)
("s" Buffer-menu-save)
("~" Buffer-menu-not-modified)
("x" Buffer-menu-execute)
("b" Buffer-menu-bury)
("g" revert-buffer)
("T" Buffer-menu-toggle-files-only)
("O" Buffer-menu-multi-occur :color blue)
("I" Buffer-menu-isearch-buffers :color blue)
("R" Buffer-menu-isearch-buffers-regexp :color blue)
("c" nil "cancel")
("v" Buffer-menu-select "select" :color blue)
("o" Buffer-menu-other-window "other-window" :color blue)
("q" quit-window "quit" :color blue))
;; Recommended binding:
;; (define-key Buffer-menu-mode-map "." 'hydra-buffer-menu/body)
;;** Example 9: s-expressions in the docstring
;; You can inline s-expresssions into the docstring like this:
(defvar dired-mode-map)
(declare-function dired-mark "dired")
(when (bound-and-true-p hydra-examples-verbatim)
(require 'dired)
(defhydra hydra-marked-items (dired-mode-map "")
Number of marked items: %(length (dired-get-marked-files))
("m" dired-mark "mark")))
;; This results in the following dynamic docstring:
;; (format "Number of marked items: %S\n"
;; (length (dired-get-marked-files)))
;; You can use `format'-style width specs, e.g. % 10(length nil).
;;** Example 10: apropos family
(defhydra hydra-apropos (:color blue
:hint nil)
_a_propos _c_ommand
_d_ocumentation _l_ibrary
_v_ariable _u_ser-option
^ ^ valu_e_"
("a" apropos)
("d" apropos-documentation)
("v" apropos-variable)
("c" apropos-command)
("l" apropos-library)
("u" apropos-user-option)
("e" apropos-value))
;; Recommended binding:
;; (global-set-key (kbd "C-c h") 'hydra-apropos/body)
;;** Example 11: rectangle-mark-mode
(require 'rect)
(defhydra hydra-rectangle (:body-pre (rectangle-mark-mode 1)
:color pink
:post (deactivate-mark))
^_k_^ _d_elete _s_tring
_h_ _l_ _o_k _y_ank
^_j_^ _n_ew-copy _r_eset
^^^^ _e_xchange _u_ndo
^^^^ ^ ^ _x_kill
("h" rectangle-backward-char nil)
("l" rectangle-forward-char nil)
("k" rectangle-previous-line nil)
("j" rectangle-next-line nil)
("e" hydra-ex-point-mark nil)
("n" copy-rectangle-as-kill nil)
("d" delete-rectangle nil)
("r" (if (region-active-p)
(rectangle-mark-mode 1)) nil)
("y" yank-rectangle nil)
("u" undo nil)
("s" string-rectangle nil)
("x" kill-rectangle nil)
("o" nil nil))
;; Recommended binding:
;; (global-set-key (kbd "C-x SPC") 'hydra-rectangle/body)
;;** Example 12: org-agenda-view
(defun org-agenda-cts ()
(and (eq major-mode 'org-agenda-mode)
(let ((args (get-text-property
(min (1- (point-max)) (point))
(nth 2 args))))
(defhydra hydra-org-agenda-view (:hint none)
_d_: ?d? day _g_: time grid=?g? _a_: arch-trees
_w_: ?w? week _[_: inactive _A_: arch-files
_t_: ?t? fortnight _f_: follow=?f? _r_: clock report=?r?
_m_: ?m? month _e_: entry text=?e? _D_: include diary=?D?
_y_: ?y? year _q_: quit _L__l__c_: log = ?l?"
("SPC" org-agenda-reset-view)
("d" org-agenda-day-view (if (eq 'day (org-agenda-cts)) "[x]" "[ ]"))
("w" org-agenda-week-view (if (eq 'week (org-agenda-cts)) "[x]" "[ ]"))
("t" org-agenda-fortnight-view (if (eq 'fortnight (org-agenda-cts)) "[x]" "[ ]"))
("m" org-agenda-month-view (if (eq 'month (org-agenda-cts)) "[x]" "[ ]"))
("y" org-agenda-year-view (if (eq 'year (org-agenda-cts)) "[x]" "[ ]"))
("l" org-agenda-log-mode (format "% -3S" org-agenda-show-log))
("L" (org-agenda-log-mode '(4)))
("c" (org-agenda-log-mode 'clockcheck))
("f" org-agenda-follow-mode (format "% -3S" org-agenda-follow-mode))
("a" org-agenda-archives-mode)
("A" (org-agenda-archives-mode 'files))
("r" org-agenda-clockreport-mode (format "% -3S" org-agenda-clockreport-mode))
("e" org-agenda-entry-text-mode (format "% -3S" org-agenda-entry-text-mode))
("g" org-agenda-toggle-time-grid (format "% -3S" org-agenda-use-time-grid))
("D" org-agenda-toggle-diary (format "% -3S" org-agenda-include-diary))
("!" org-agenda-toggle-deadlines)
("[" (let ((org-agenda-include-inactive-timestamps t))
(org-agenda-check-type t 'timeline 'agenda)
(message "Display now includes inactive timestamps as well")))
("q" (message "Abort") :exit t)
("v" nil))
;; Recommended binding:
;; (define-key org-agenda-mode-map "v" 'hydra-org-agenda-view/body)
;;** Example 13: automatic columns
(defhydra hydra-movement ()
("j" next-line "down" :column "Vertical")
("k" previous-line "up")
("l" forward-char "forward" :column "Horizontal")
("h" backward-char "back"))
;;* Helpers
(require 'windmove)
(defun hydra-move-splitter-left (arg)
"Move window splitter left."
(interactive "p")
(if (let ((windmove-wrap-around))
(windmove-find-other-window 'right))
(shrink-window-horizontally arg)
(enlarge-window-horizontally arg)))
(defun hydra-move-splitter-right (arg)
"Move window splitter right."
(interactive "p")
(if (let ((windmove-wrap-around))
(windmove-find-other-window 'right))
(enlarge-window-horizontally arg)
(shrink-window-horizontally arg)))
(defun hydra-move-splitter-up (arg)
"Move window splitter up."
(interactive "p")
(if (let ((windmove-wrap-around))
(windmove-find-other-window 'up))
(enlarge-window arg)
(shrink-window arg)))
(defun hydra-move-splitter-down (arg)
"Move window splitter down."
(interactive "p")
(if (let ((windmove-wrap-around))
(windmove-find-other-window 'up))
(shrink-window arg)
(enlarge-window arg)))
(defvar rectangle-mark-mode)
(defun hydra-ex-point-mark ()
"Exchange point and mark."
(if rectangle-mark-mode
(let ((mk (mark)))
(rectangle-mark-mode 1)
(goto-char mk))))
(provide 'hydra-examples)
;; Local Variables:
;; no-byte-compile: t
;; End:
;;; hydra-examples.el ends here