Dynamically find relevant trackman marble prop ids

udev/handle-trackman-marble

@@ -4,27 +4,49 @@ set -o errexit
 main() {
   export RUNNING_AS="${RUNNING_AS:-me}"
   export RUNNING_AS_ID="$(id -u "${RUNNING_AS}")"
+  export XINPUT_EXE="${XINPUT_EXE:=xinput}"
 
   export XAUTHORITY="/home/${RUNNING_AS}/.Xauthority"
   export DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/${RUNNING_AS_ID}/bus"
   export DISPLAY=:0
   export HOME="/home/${RUNNING_AS}"
 
+
   local device_id
   device_id="$(__get_device_id)"
 
-  # libinput Natural Scrolling Enabled (282)
-  /usr/bin/sudo -E -u "${RUNNING_AS}" \
-    /usr/sbin/xinput set-prop "${device_id}" 282 1
+  local natscroll_enabled
+  natscroll_enabled="$(
+    __get_prop_id "${device_id}" 'Natural Scrolling Enabled'
+  )"
+
+  local scrollmeth_enabled
+  scrollmeth_enabled="$(
+    __get_prop_id "${device_id}" 'Scroll Method Enabled'
+  )"
 
-  # libinput Scroll Method Enabled (285)
-  /usr/bin/sudo -E -u "${RUNNING_AS}" \
-    /usr/sbin/xinput set-prop "${device_id}" 285 0 0 1
+  __run_xinput_as set-prop "${device_id}" "${natscroll_enabled}" 1
+  __run_xinput_as set-prop "${device_id}" "${scrollmeth_enabled}" 0 0 1
 }
 
 __get_device_id() {
-  /usr/bin/sudo -E -u "${RUNNING_AS}" /usr/sbin/xinput list |
+  __run_xinput_as list |
     awk '/Logitech USB Trackball/ { sub(/id=/, "", $6); print $6 }'
 }
 
+__get_prop_id() {
+  local device_id="${1}"
+  local propmatch="${2}"
+  __run_xinput_as list-props "${device_id}" |
+    awk -F: '/'"${propmatch}"' \([0-9]+\)/ {
+      sub(/.+\(/, "", $1);
+      sub(/\).*/, "", $1);
+      print $1;
+    }'
+}
+
+__run_xinput_as() {
+  sudo -E -u "${RUNNING_AS}" "${XINPUT_EXE}" "${@}"
+}
+
 main "${@}"