first commit

install-navka-relay.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# ---------- paths ----------
+SRC_DIR=$(pwd)                 # where the script is launched
+APPDIR=/opt/navka-relay
+VENV=$APPDIR/venv
+SERVICE=$HOME/.config/systemd/user/navka-relay.service
+USR=${SUDO_USER:-$USER}
+
+green(){ printf '\e[1;32m==>\e[0m %s\n' "$*"; }
+
+##############################################################################
+green "1.  Packages (python + evdev) …"
+##############################################################################
+sudo pacman -Sy --needed --noconfirm python python-evdev >/dev/null
+
+##############################################################################
+green "2.  Install /opt/navka-relay …"
+##############################################################################
+sudo mkdir -p "$APPDIR"
+sudo chown "$USR":"$USR" "$APPDIR"
+
+# use a symlink when run from dev folder so edits are live
+if [[ $SRC_DIR != "$APPDIR" ]]; then
+  ln -sf "$SRC_DIR/navka-relay.sh" "$APPDIR/navka-relay.sh"
+fi
+chmod +x "$SRC_DIR/navka-relay.sh"
+
+##############################################################################
+green "3.  Build virtual-env (system pkgs visible) …"
+##############################################################################
+if [[ ! -d $VENV/bin ]]; then
+  python -m venv --system-site-packages "$VENV"
+fi
+
+# ensure evdev importable inside venv (pacman pkg provides it; pip fallback)
+"$VENV/bin/pip" install --quiet --disable-pip-version-check --upgrade pip >/dev/null
+"$VENV/bin/python" - <<'PY'
+import importlib, subprocess, sys
+try:
+    importlib.import_module('evdev')
+except ImportError:
+    subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'evdev'])
+PY
+
+##############################################################################
+green "4.  systemd *user* unit …"
+##############################################################################
+mkdir -p "$(dirname "$SERVICE")"
+cat >"$SERVICE" <<EOF
+[Unit]
+Description=Navka keyboard relay
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/opt/navka-relay/navka-relay.sh
+Restart=on-failure
+EnvironmentFile=%h/.config/navka-relay.env
+
+[Install]
+WantedBy=default.target
+EOF
+
+systemctl --user daemon-reload
+systemctl --user enable navka-relay >/dev/null 2>&1 || true
+
+green "✔  Install complete"
+cat <<'TXT'
+Start relay : systemctl --user start navka-relay
+Stop relay  : systemctl --user stop  navka-relay
+Manual run  : /opt/navka-relay/navka-relay.sh
+Variables   : NAVKA_IP=… NAVKA_PORT=… NAVKA_KBD=… navka-relay.sh
+TXT
+

navka-relay.sh

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+#!/usr/bin/env bash
+# Wrapper that activates local venv then executes embedded Python
+
+DIR=$(dirname "$(readlink -f "$0")")
+VENV=/opt/navka-relay/venv
+PY="$VENV/bin/python"
+
+if [[ ! -x $PY ]]; then
+  echo "❌  venv missing: run install-navka-relay.sh first." >&2
+  exit 1
+fi
+
+# shellcheck disable=SC2091
+exec $PY - <<'PYCODE'
+import os, socket, selectors, signal, sys
+from evdev import InputDevice, ecodes
+
+# --------- config via env ----------
+DEV   = os.getenv("NAVKA_KBD", "/dev/input/event4")
+IP    = os.getenv("NAVKA_IP",  "192.168.42.253")
+PORT  = int(os.getenv("NAVKA_PORT", "4000"))
+# -----------------------------------
+
+# full HID tables (letters, numbers, F1-F12, arrows, etc.)
+HID = {**{getattr(ecodes,f"KEY_F{i}"):i+53 for i in range(1,13)}}
+for ev,h in {
+  **{k:4+i for i,k in enumerate(range(ecodes.KEY_A,ecodes.KEY_Z+1))},
+  **{k:30+i for i,k in enumerate(range(ecodes.KEY_1,ecodes.KEY_0+1))},
+  ecodes.KEY_ENTER:40, ecodes.KEY_ESC:41, ecodes.KEY_BACKSPACE:42,
+  ecodes.KEY_TAB:43,  ecodes.KEY_SPACE:44, ecodes.KEY_MINUS:45,
+  ecodes.KEY_EQUAL:46, ecodes.KEY_LEFTBRACE:47, ecodes.KEY_RIGHTBRACE:48,
+  ecodes.KEY_BACKSLASH:49, ecodes.KEY_SEMICOLON:51, ecodes.KEY_APOSTROPHE:52,
+  ecodes.KEY_GRAVE:53, ecodes.KEY_COMMA:54, ecodes.KEY_DOT:55,
+  ecodes.KEY_SLASH:56, ecodes.KEY_RIGHT:79, ecodes.KEY_LEFT:80,
+  ecodes.KEY_DOWN:81,  ecodes.KEY_UP:82
+}.items(): HID.setdefault(ev, h)
+
+MOD = { ecodes.KEY_LEFTCTRL:1, ecodes.KEY_LEFTSHIFT:2, ecodes.KEY_LEFTALT:4,
+        ecodes.KEY_LEFTMETA:8, ecodes.KEY_RIGHTCTRL:16, ecodes.KEY_RIGHTSHIFT:32,
+        ecodes.KEY_RIGHTALT:64, ecodes.KEY_RIGHTMETA:128 }
+
+try:
+    dev = InputDevice(DEV)
+except FileNotFoundError:
+    sys.exit(f"Input device {DEV} not found")
+
+dev.grab()
+sock = socket.create_connection((IP,PORT), timeout=5)
+sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+
+mods, keys = 0, []
+
+def send():
+    sock.sendall(bytes([mods,0]+keys[:6]+[0]*(6-len(keys))))
+
+def quit_handler(sig, frame):     # graceful Ctrl-C
+    dev.ungrab(); sock.close(); sys.exit(0)
+
+signal.signal(signal.SIGINT, quit_handler)
+
+for ev in dev.read_loop():
+    if ev.type != ecodes.EV_KEY: continue
+    pressed = ev.value == 1
+    if ev.code in MOD:
+        mods = mods | MOD[ev.code] if pressed else mods & ~MOD[ev.code]
+    elif ev.code in HID:
+        h = HID[ev.code]
+        if pressed and h not in keys: keys.insert(0,h)
+        elif not pressed and h in keys: keys.remove(h)
+    else:
+        continue
+    send()
+PYCODE
+