From 38ee4f180960350aff07498e4277b269a401cee6 Mon Sep 17 00:00:00 2001
From: Martin Sekera <sekerama@gmail.com>
Date: Sat, 18 Jan 2025 00:51:30 +0100
Subject: [PATCH] add brightness control for I2C monitors

---
 bin/brightness-i2c | 11 +++++++++++
 lib/prompt-init    |  6 ++++++
 2 files changed, 17 insertions(+)
 create mode 100755 bin/brightness-i2c

diff --git a/bin/brightness-i2c b/bin/brightness-i2c
new file mode 100755
index 0000000..f82f28b
--- /dev/null
+++ b/bin/brightness-i2c
@@ -0,0 +1,11 @@
+#! /bin/zsh
+
+OPERATOR="${1}"
+AMOUNT="${2}"
+
+BUSES=(${(s/:/)OVER_ENV_MONITORS_I2C})
+
+for BUS in ${BUSES}
+do
+	ddcutil --skip-ddc-checks --noverify --verbose --bus=${BUS} setvcp 0x10 "${OPERATOR}" "${AMOUNT}"
+done
diff --git a/lib/prompt-init b/lib/prompt-init
index edfe0d1..760d539 100755
--- a/lib/prompt-init
+++ b/lib/prompt-init
@@ -5,6 +5,12 @@ zmodload zsh/datetime
 OVER_PROMPT_CFG="/etc/over/env/prompt.cfg"
 OVER_PROMPT_TITLE=""
 
+which ddcutil > /dev/null
+if [[ $? -eq 0 ]]; then
+	local I2C_IDS=($(ddcutil detect --terse | grep "I2C bus" | sed "s/^.*-//"))
+	export OVER_ENV_MONITORS_I2C=${(j|:|)I2C_IDS}
+fi
+
 if [[ -a "$OVER_PROMPT_CFG" ]]; then
 	source "$OVER_PROMPT_CFG"
 fi