From 0136343f0fda8fc6178f7ec34c3b9cbed54f781a Mon Sep 17 00:00:00 2001
From: Nico Schottelius <nico@nico-notebook.schottelius.org>
Date: Tue, 22 Feb 2022 22:13:08 +0100
Subject: [PATCH] Add script to rotate screen based on sensor

---
 rotate-by-sensor.sh | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100755 rotate-by-sensor.sh

diff --git a/rotate-by-sensor.sh b/rotate-by-sensor.sh
new file mode 100755
index 0000000..adfa208
--- /dev/null
+++ b/rotate-by-sensor.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# 2022-02-22, Nico Schottelius
+# Inspired by https://gist.github.com/Links2004/5976ce97a14dabf773c3ff98d03c0f61
+
+output=$(xrandr | awk '/connected primary/ { print $1 }')
+input=$(xinput --list | grep -e "Pen Pen" | sed 's/.*id=\([0-9]*\).*/\1/')
+
+monitor-sensor | (
+    while true; do
+        read line
+        ORIENTATION=$(echo $line | awk -F: '/Accelerometer orientation changed:/ { print $2 } ' | sed 's/ *//')
+
+        # Check if we are matching on a correct line, if not, skip
+        if [ -z "$ORIENTATION" ]; then
+            continue
+        fi
+
+        echo $ORIENTATION
+
+	    case "$ORIENTATION" in
+	        normal)
+		        rotate="normal"
+		        matrix="1 0 0 0 1 0 0 0 1"
+		        ;;
+	        bottom-up)
+		        rotate="inverted"
+		        matrix="-1 0 1 0 -1 1 0 0 1"
+		        ;;
+	        right-up)
+		        rotate="right"
+		        matrix="0 1 0 -1 0 1 0 0 1"
+		        ;;
+	        left-up)
+		        rotate="left"
+		        matrix="0 -1 1 1 0 0 0 0 1"
+		        ;;
+	    esac
+
+#        set -x
+        xrandr --output ${output} --rotate ${rotate}
+        xinput set-prop ${input} 'Coordinate Transformation Matrix' ${matrix}
+#        set +x
+    done
+)