dhruvinsh/zmk-num-word

Proof of concept where num-word behavior implemented as external module for zmk

ZMK-NUM-WORD

Implement urob's num-word behavior for ZMK.

This is proof of concept that shows that without maintaining fork, new behavior can be implemented.

This implementation supports latest Zephyr 3.5 release with ZMK.

How to use this module?

Under config/west.yml add remotes and projects, here is an example of full file.

manifest:
  remotes:
    - name: zmkfirmware
      url-base: https://github.com/zmkfirmware
    - name: dhruvinsh
      url-base: https://github.com/dhruvinsh
  projects:
    - name: zmk
      remote: zmkfirmware
      revision: main
      import: app/west.yml
    - name: zmk-num-word
      remote: dhruvinsh
      revision: main
  self:
    path: config

NOTE: common use-case is define.

Summary

The num word behavior behaves similar to a cap word, but will automatically deactivate when any key not in a continue list is pressed, or if the num word key is pressed again. For smaller keyboards using mod-taps, this can help avoid repeated alternating holds when typing numbers.

The modifiers are applied only to to the number (0 to 9) keycodes.

Behavior Binding

• Reference: &num_word

Example:

&num_word

NOTE: Make sure you have custom behavior called num_word create, see above guide.

Configuration

Default behavior (need to assign layer) defined as,

/ {
    behaviors {
      num_word: num_word {
        #binding-cells = <0>;
        compatible = "zmk,behavior-num-word";
        continue-list = <BSPC DEL DOT COMMA PLUS MINUS STAR FSLH EQUAL>;
        ignore-numbers;
    };
  };
};

To use default behavior (do not forget to use include),

#include <behaviors/num_word.dtsi>

&num_word {
  layers = <1 2 3>;
}

To create new behavior,

#include <dt-bindings/zmk/keys.h>

/ {
    behaviors {
      new_num_word: new_num_word {
        #binding-cells = <0>;
        compatible = "zmk,behavior-num-word";
        layers = <1 2 3>;
        continue-list = <BSPC EQUAL>;
        ignore-numbers;
    };
  };
};

Once this define, &new_num_word can be use in keymap.

Continue List

By default, the num word will remain active when any numeric character or BSPC, DEL, DOT, COMMA, PLUS, MINUS, STAR, FSLH, EQUAL characters are pressed (see above definition). Any other non-modifier keycode sent will turn off num word. If you would like to override this, you can set a new array of keys in the continue-list property in your keymap:

&num_word {
    continue-list = <UNDERSCORE MINUS>;
};

/ {
    keymap {
        ...
    };
};

Credits

• Pete Johanson
• Robert U
• ZMK and Zephyr

Other Project

• ZMK-TRI-STATE