mrrl-logincaps

commit 8a0ee06ba48c4dccd5d9705b44e0287727310110
parent c6dc5f11bd42edc9e0aa386ffe78b2a71e854f9f
Author: ccx <ccx@te2000.cz>
Date:   Fri,  7 Jun 2024 20:13:42 +0000

Add brightness login capability

Diffstat:
A
sbin/login.capability.brightness
 | 
34
++++++++++++++++++++++++++++++++++

1 file changed, 34 insertions(+), 0 deletions(-)
diff --git a/sbin/login.capability.brightness b/sbin/login.capability.brightness
@@ -0,0 +1,34 @@
+#!/bin/zsh
+setopt no_unset warn_create_global extended_glob
+
+typeset -g backlight /sys/class/backlight/amdgpu_bl0
+
+adjust-brightness() {
+	awk >$backlight/brightness \
+		-v adjustment=$1 \
+		-v max=$(<$backlight/max_brightness) \
+		-v current=$(<$backlight/brightness) \
+		'BEGIN {
+			if(match(adjustment, /^\+[0-9]+%$/)) {
+				adjustment = substr(adjustment, 2, RLENGTH - 2)
+				adjustment = current + adjustment * 0.01 * max
+			} else if(match(adjustment, /^-[0-9]+%$/)) {
+				adjustment = substr(adjustment, 2, RLENGTH - 2)
+				adjustment = current - adjustment * 0.01 * max
+			} else if(match(adjustment, /^[0-9]+%$/)) {
+				adjustment = substr(adjustment, 1, RLENGTH - 1)
+				adjustment =  adjustment * 0.01 * max
+			} else if(match(adjustment, /^\+[0-9]+$/)) {
+				adjustment = substr(adjustment, 2)
+				adjustment = current + adjustment
+			} else if(match(adjustment, /^-[0-9]+$/)) {
+				adjustment = substr(adjustment, 2)
+				adjustment = current - adjustment
+			}
+			adjustment = adjustment < 0 ? 0 : ( adjustment > max ? max : adjustment )
+			printf ("%d\n", adjustment)
+		}'
+}
+
+adjust-brightness $1
+#  vim: ft=zsh noet ts=4 sts=4 sw=4