working and installable version achived

autoscreenrotation.sh

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+#!/usr/bin/env bash
+#
+# @AUTHOR: Luca Leon Happel
+# @DATE  : 2021-11-07 So 19:12 32
+#
+
+function processnewcommand {
+	case $1 in
+		"Accelerometer orientation changed: normal")
+			echo "screen rotated to normal"
+			./screenrotation.sh "normal"
+			;;
+		"Accelerometer orientation changed: bottom-up")
+			echo "screen rotated to inverted"
+			./screenrotation.sh "inverted"
+			;;
+		"Accelerometer orientation changed: left-up")
+			echo "screen rotated to left"
+			./screenrotation.sh "left"
+			;;
+		"Accelerometer orientation changed: right-up")
+			echo "screen rotated to right"
+			./screenrotation.sh "right"
+			;;
+	esac
+}
+
+export -f processnewcommand
+monitor-sensor | xargs --replace=% bash -c 'processnewcommand "%"'

default.nix

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+{ pkgs ? import <nixpkgs> {} }: with pkgs;
+
+stdenv.mkDerivation {
+  version = "1.0";
+  name = "flex5ScreenRotate";
+  src = ./.;
+  buildInputs = [
+    libwacom
+    xf86_input_wacom
+    xorg.xrandr
+    iio-sensor-proxy
+  ];
+  dontBuild = true;
+  installPhase = ''
+    mkdir -pv $out/bin/
+    cp ./screenrotation.sh $out/bin/
+    chmod +x $out/bin/screenrotation.sh
+    cp ./autoscreenrotation.sh $out/bin/
+    chmod +x $out/bin/autoscreenrotation.sh
+  '';
+}

readme.md

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+# flex5ScreenRotate
+
+Automatically rotate the Lenovo Flex 5 screen and Wacom inputs
+given the accelerometer picks up an orientation change
+
+## Requirements
+
+Please look in `default.nix` under `buildInputs = [ ... ];` which
+programs are reqired. `iio-sensor-proxy` is also needed.
+
+## Usage
+
+Run `./autoscreenrotation.sh`

screenrotation.sh

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+#!/usr/bin/env bash
+#
+# @AUTHOR: Luca Leon Happel
+# @DATE  : 2021-06-13 So 00:50 57
+#
+# This is a script that toggles rotation of the screen through xrandr,
+# and also toggles rotation of the stylus, eraser and cursor through xsetwacom
+
+screen=`xrandr --current | grep " connected" | awk '{print $1;}'`
+orientation=`xrandr --verbose -q | grep $screen | awk '{print $6}'`
+
+echo $screen
+echo $orientation
+
+function wacom_setup {
+	xsetwacom set "Wacom HID 5218 Pen stylus" Rotate $1
+	xsetwacom set "Wacom HID 5218 Finger touch" Rotate $1
+	xsetwacom set "Wacom HID 5218 Pen eraser" Rotate $1
+}
+
+if [[ -z "$1" ]]; then
+	echo "Missing argument!"
+	echo "Possible values are: normal, inverted, left, right"
+elif [ "$1" = "normal" ]; then
+	xrandr --output $screen --rotate normal
+	wacom_setup none
+elif [ "$1" = "inverted" ]; then
+	xrandr --output $screen --rotate inverted
+	wacom_setup half
+elif [ "$1" = "left" ]; then
+	xrandr --output $screen --rotate left
+	wacom_setup ccw
+elif [ "$1" = "right" ]; then
+	xrandr --output $screen --rotate right
+	wacom_setup cw
+fi