Files
lhns--steam-frame-nix/modules/steam-keyboard-patch.nix
T
Pierre Kisters a3b05b7474 VR keyboard: AltGr + the key left of Backspace = Delete
While AltGr is active, the key left of Backspace (German ´/`, empty on
AltGr) becomes Delete, labelled like Steam's Delete key (Entf; Del when
longer), sent by the helper; repeats while held like Backspace.
2026-09-28 03:55:38 +02:00

59 lines
2.3 KiB
Nix

# Steam's VR keyboard can only send text (ControllerKeyboardSetKeyState throws
# "Unknown method" in VR), and its layouts are hardcoded.
# - patch.js (injected over CEF DevTools, 127.0.0.1:8080) adds a bottom row
# Esc Ctrl Alt [space] AltGr ← ↑ ↓ → (AltGr+arrows = Pos1/PgUp/PgDn/End) and
# hands chords, Shift+arrows and characters Steam would turn into "1"
# (non-ASCII, AltGr/dead keys) to the helper. AltGr + the key left of
# Backspace = Delete.
# - helper.mjs keeps it injected, sends those keys with xdotool on :0 (an
# allowlist: no ASCII text, no Enter) and unpatches on stop.
# Tested with Steam client 1790377368 (UI build 11041156).
{ config, pkgs, lib, ... }:
let
patch = (import ./lib { inherit pkgs; }).mkPatch {
name = "steam-keyboard-patch";
src = ./steam-keyboard-patch/patch.js;
};
cfg = config.steamFrame.keyboard.vr.extraKeys;
in {
imports = [
./session.nix
(lib.mkRenamedOptionModule
[ "steamFrame" "steamKeyboardPatch" "enable" ]
[ "steamFrame" "keyboard" "vr" "extraKeys" "enable" ])
];
options.steamFrame.keyboard.vr.extraKeys.enable = lib.mkEnableOption ''
Esc/Ctrl/Alt, arrow keys, Ctrl/Alt chords (held while toggled) and
AltGr/non-ASCII characters on Steam's VR keyboard (Steam UI patch plus an
xdotool helper service); off reverts it on the next switch'';
config = lib.mkMerge [
(lib.mkIf cfg.enable {
systemd.user.services.steam-keyboard-patch = {
Unit.Description = "Modifier keys for Steam's VR keyboard (CEF patch + xdotool)";
Service = {
ExecStart = lib.escapeShellArgs [
"${pkgs.nodejs}/bin/node"
"${./steam-keyboard-patch/helper.mjs}"
"${patch}"
"${./steam-keyboard-patch/unpatch.js}"
"${pkgs.xdotool}/bin/xdotool"
];
Restart = "always";
RestartSec = 5;
TimeoutStopSec = 5; # the helper unpatches Steam's UI on SIGTERM
};
Install.WantedBy = [ "default.target" ];
};
# Restart on switch to re-inject a changed patch.
steamFrame.session.services.restart = [ "steam-keyboard-patch.service" ];
})
# Disabled: stopping the helper reverts the patch right away.
(lib.mkIf (!cfg.enable) {
steamFrame.session.services.stop = [ "steam-keyboard-patch.service" ];
})
];
}