key-seq — map pairs of sequentially pressed keys to commands
So, finally, I'm blogging on Emacs. Over the years I've collected quite a few Emacs tips worth to share with others. I hope blogging will make me improve my .emacs.d and I'll end up creating a few packages, so hopefully Emacs community will benefit too. First my post is dedicated to keybindings, precisely the package called key-seq.
If you have been interested in ability to run commands inside Emacs with fewer keys than traditionally long Emacs keybindings require you must have heard about key-chord. If you didn't, briefly, key-chord allows you to map any two keys to a command. The command will be executed only if you press keys quickly. It's reasonable to bind the keys that rarely appear together.
For key-chord it doesn't matter in which order you press keys. For
someone it may sound like a good idea. Though this drastically reduces
the amount of key pairs that are "safe" to use. By "safe" I mean those
key pairs that are almost never appear together in your writings
(texts, code, etc.) For example, in English letter
q is almost
always followed by
u (the notable exception for programmers is
pair as it may stand for "query language"). So for me it sounds
reasonable to use
q as a prefix. But since key-chord defines key
pairs in both specified order and in reverse, it will also execute
commands for unwanted key pairs.
So the solution is obvious: modify key-chord so it produces only a single binding. I've used these slightly modified functions for a few years and now decided to create a package called key-seq to simplify installation for others and submitted it to MELPA.
If you installed key-chord and key-seq manually than you need load them first (you can skip this step if you installed both from MELPA or different package archive):
(require 'key-chord) (require 'key-seq)
key-seq requires active
key-chord-mode to work. So first load the
Now you can define key pairs as follows:
(key-seq-define-global "qd" 'dired) (key-seq-define-local "qc" 'compile) (key-seq-define text-mode-map "qf" 'flyspell-buffer)
Unset key sequences as follows:
(key-seq-unset-global "qd") (key-seq-unset-local "qc") (key-seq-define text-mode-map "qf" nil)
For customizations use
key-chord-* variables. For example, you can
slightly increase delays:
(setq key-chord-two-keys-delay 0.2) (setq key-chord-one-key-delay 0.3)
That's all. Hope you will find this package useful!
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