Emacs: Making a hydra cheatsheet for Lispy

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I wanted to get the hang of Lispy thanks to Leo Vivier’s presentation at EmacsSF, but there are a lot of keyboard shortcuts to explore. In Karl Voit’s demo of Org Mode at GLT21, he showed how he uses Hydra to make cheat sheets. That makes perfect sense, of course, as Hydra can display text and allow you to run commands while the text is displayed. I wanted to make a Hydra that would show me categorized commands to make it easier to look up and eventually remember them. I also wanted to skip the commands that I already knew or that I didn’t want to focus on just yet.

Fortunately, the function reference had a link to the Org file used to generate it. I copied the tables, merged them together, named them with #+NAME: bindings, replaced the links with plain text, and added a third column with the category I wanted to put commands into.

#bindings
key function column
< lispy-barf  
A lispy-beginning-of-defun  
j lispy-down  
Z lispy-edebug-stop  
B lispy-ediff-regions  
G lispy-goto-local  
h lispy-left  
N lispy-narrow  
y lispy-occur  
o lispy-other-mode  
J lispy-outline-next  
K lispy-outline-prev  
P lispy-paste  
l lispy-right  
I lispy-shifttab  
> lispy-slurp  
SPC lispy-space  
xB lispy-store-region-and-buffer  
u lispy-undo  
k lispy-up  
v lispy-view  
V lispy-visit  
W lispy-widen  
D pop-tag-mark  
x see  
L unbound  
U unbound  
X unbound  
Y unbound  
H lispy-ace-symbol-replace Edit
c lispy-clone Edit
C lispy-convolute Edit
n lispy-new-copy Edit
O lispy-oneline Edit
r lispy-raise Edit
R lispy-raise-some Edit
\ lispy-splice Edit
S lispy-stringify Edit
i lispy-tab Edit
xj lispy-debug-step-in Eval
xe lispy-edebug Eval
xT lispy-ert Eval
e lispy-eval Eval
E lispy-eval-and-insert Eval
xr lispy-eval-and-replace Eval
p lispy-eval-other-window Eval
q lispy-ace-paren Move
z lispy-knight Move
s lispy-move-down Move
w lispy-move-up Move
t lispy-teleport Move
Q lispy-ace-char Nav
lispy-ace-subword Nav
a lispy-ace-symbol Nav
b lispy-back Nav
d lispy-different Nav
f lispy-flow Nav
F lispy-follow Nav
g lispy-goto Nav
xb lispy-bind-variable Refactor
xf lispy-flatten Refactor
xc lispy-to-cond Refactor
xd lispy-to-defun Refactor
xi lispy-to-ifs Refactor
xl lispy-to-lambda Refactor
xu lispy-unbind-variable Refactor
M lispy-multiline Other
xh lispy-describe Other
m lispy-mark-list Other

I wrote this Emacs Lisp code with the header arguments #+begin_src emacs-lisp :var bindings=bindings :colnames yes:

(eval
 (append
  '(defhydra my/lispy-cheat-sheet (:hint nil :foreign-keys run)
     ("<f14>" nil :exit t))
  (cl-loop for x in bindings
           unless (string= "" (elt x 2))
           collect
           (list (car x)
                 (intern (elt x 1))
                 (when (string-match "lispy-\\(?:eval-\\)?\\(.+\\)"
                                     (elt x 1))
                   (match-string 1 (elt x 1)))
                 :column
                 (elt x 2)))))
(with-eval-after-load "lispy"
  (define-key lispy-mode-map (kbd "<f14>") 'my/lispy-cheat-sheet/body))

Here’s the result:

Screenshot_20210413_002503.png

Figure 1: Hydra-based cheat sheet

I’m experimenting with having my Windows key be F14 if tapped and Super_L if held down. I use KDE, so I disabled the Applications shortcut with:

kwriteconfig5 --file ~/.config/kwinrc --group ModifierOnlyShortcuts --key Meta ""
qdbus org.kde.KWin /KWin reconfigure

and then used xcape -e 'Super_L=F14' to make it work.

Looking forward to getting the hang of this!

This is part of my Emacs configuration.
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