T4CORUN Userspace

My userspace for building QMK firmware via GitHub Actions. This does not require a local build environment where files are placed within keyboard subfolders.

Layout

The custom layout optimizes for programming (SQL, Powershell, C) and minimizes holds for comfort. It started from Manna Harbor Miryoku and took heavy influence from Jonas Hietala T-34. The keymap designed for split 3x5, two thumbs keys, dual encoders, and combined with a Ploopy Nano trackball mouse. Design themes:

• Releasing all keys always brings you back to base layer
• Patterns to layout design to reduce learning curve (e.g., Shortcuts in same place on multiple layers)
• Symbols important for powershell / writing are positioned under stronger fingers
• Game keymap that doesn't require massive game key bind changes. Tested on Resident Evil 4 Remake

Notes:

• Outside thumb keys are encoder clicks. Some keyboards may have extra thumb keys
• Pressing Pointer DPI and Drag Scroll Toggle together will enter Ploopy Nano's boot loader

Features

Build Non-Tree Keyboards

• Extended the qmk/.github userspace build actions to build non-tree qmk keyboards (e.g. Barbellboards Rollow). This works by copying keyboard definitions from the userspace to the qmk_firmware keyboards folder in the container. The list of keyboards to copy are defined in qmk_nontree.json

Layout Wrapper Macros

A single keymap layout can be shared with multiple keyboards by using C preprocessor macros. These macros are referenced in the keyboard JSON files, and the build process will expand them into a transient keymap.c file during compile time.

In this userspace, the base split 3x5_3 layout can be adapted for other split keyboards by expanding it with macros. For example, there is a wrapper that will add extra columns to the base layout for a Corne's 42-key 3x6_3 layout.

Tri-Layer

Hold both thumb momentary layer keys NAVIGATION and NUMBER to access the SYMBOL layer

One Shot Mods

One Shot Mods is here to minimize holding, simplify layers, and avoid misfires from having Home Row Mods. Here we have bi-lateral(ish) GACS mods.

Mouse Keys

This layout is designed to be used with a Ploopy Nano. Mouse buttons and scroll wheel is handled on the keyboard side via combos. There are macros with the host status (Caps lock, Num Lock) to toggle Ploopy Nano settings and switch to drag scrolling (simulates scroll wheel)

Caps Word

Caps Word enables temporary all-caps typing without holding shift. Useful to typing programming variables. Tap shift twice to enable Caps Word. It cancels when any key is pressed except

• numbers 0-9
• backspace
• delete
• underscore

Tap-Holds

Certain keys have different behaviors when held vs tapped allowing commonly typed programming syntax or shifting certain keycodes without actually pressing/holding shift

Keycode	When tapped	When held	Comments
TR_LBRC	[	[] with cursor inside
TR_LABK	<	<> with cursor inside
TR_LPRN	(	() with cursor inside
TR_SQUO	"	"" with cursor inside
TR_SQUO	'	'' with cursor inside
TR_BSLS	\	\\
TR_SLSH	/	//
TR_PIPE	|	||
TR_COMM	,	(	enables parenthesis on base layer
TR_DOT	.	)
TR_PERC	%	^
TR_EQL	=	+
TR_MINS	-	_
TR_GRV	backtick	~
TR_SCLN	;	:
TR_QUOT	'	"

Opted to implement overrides here instead of using built-in Key Override functionality because this implementation does not require pressing/holding shift to get the alternate key

Combos

Enables additional keys to be mapped by pressing multiple keys simultaneously. Primarily used to implement mouse buttons and make important keys (tab, backspace, etc) available on base layer. Combos are mapped based on the QWERTY layout but will work on any layer*. All Combos are disabled when CONFIG layer is active

Combo	Result	Comment
D + F	Mouse Button 1	Left click. Mouse buttons only work on base layer
S + D	Mouse Button 2	RIght click
F + G	Mouse Button 3	Middle click
R + F	Mouse Button 4	Back
T + G	Mouse Button 5	Forward
T + G	Drag Scroll Toggle
C + V	Enter
U + I	Tab
M + Comma	Backspace

Key Overrides

Enables us to customize the result of applying certain mods to keycodes. For example, Shift + Backspace will give Delete. Primarily used to minimize the number of layers required and the layout itself

Shortcut	Result	Comment
Shift + Backspace	Delete	Backspace is a combo. There are no dedicated backspace and delete keys mapped
Shift + Next Song	Prev Song	Only works on NAVIGATION layer
Meh + 1...9	F1...F9	Only works on NUMBER layer. Meh is Shift + Ctrl + Alt.
Meh + Comma	F10	Only works on NUMBER layer
Meh + Dot	F11	Only works on NUMBER layer
Meh + Minus	F12	Only works on NUMBER layer
Ctrl + Mouse 1	Print Screen	Only works on NUMBER layer
Alt + Mouse 2	Open File Explorer	Only works on NUMBER layer. Keyboard Shortcut GUI + E

Optional Features

These features can be disabled due to MCU size constraints or because certain keyboards do not support it

Pointing Device

Enables trackball functionality on certain boards (e.g., Ploopy Nano and Bastardkb Charybdis Nano). The board definitions enables unique functionality:

• Charybdis Nano: "Sniper" precision tracking, drag Scroll, DPI changes
• Ploopy Nano: Ties with Host Status LED macros to enable drag scroll, dpi changes, and bootloader

Note: MOUSEKEY_ENABLE do not need to be enabled in tandem with this to get the mouse buttons.

RGB Matrix

Taste the rainbow for boards with RGB LEDs and large MCU memory footprints. Enables RGB lighting effects and layer/host status indicators. Review the keyboard files to identify the key position for each LED and update the preprocessor definitions in config\rgbmatrix_config.h

OLED

Enables keyboard status visualization. Shows currently selected layer, active modifiers, and host status (e.g, Num / Caps / Scroll Lock)

Target Keyboards

All boards use my keymaps unless noted

• Ploopy Nano: lkbm keymap
• Bastardkb Charybdis Nano 3x5
• Crkbd 3x6
• Planck Rev6
• Ferris Swoop
• Barbell Rollow (non-tree)
• DZRGB60v2 (coming)
• Geist KLOR (coming)

Links

• qmk documentation
• qmk/awesome-userspaces Github. Links to fantastic userspaces to draw inspiration from, such as Drashna's