commit 8ddd293b102bbf48aadd834f5769d232f70bf881
Author: Alexander Rosenberg <zanderpkg@pm.me>
Date:   Tue Sep 6 01:42:03 2022 -0700

    Initial commit

diff --git a/brightness-control.sh b/brightness-control.sh
new file mode 100755
index 0000000..f6f6011
--- /dev/null
+++ b/brightness-control.sh
@@ -0,0 +1,65 @@
+#!/usr/bin/bash
+
+SAVE_FILE="${HOME}/.cache/brightness-control-cache"
+
+notify-brightness() {
+    brightness="$(brightnessctl -m | sed 's/,/ /g' | awk '{print $4}' | tr -d '\n' | tr -d '%')"
+    notify-send -h string:x-canonical-private-synchronous:brightness-control-sh -t 4000 -u normal -a "Brightness" -h int:value:"$brightness" "$brightness%"
+}
+
+save-brightness() {
+    brightness="$(brightnessctl -m | sed 's/,/ /g' | awk '{print $4}' | tr -d '\n' | tr -d '%')"
+    printf '%d' "${brightness}" >"${SAVE_FILE}"
+}
+
+restore-brightness() {
+    if [ ! -e "${SAVE_FILE}" ]; then
+        echo "brightness-control.sh: error: save file at \"${SAVE_FILE}\" not found" >&2
+        exit 1
+    fi
+    brightness="$(cat "${SAVE_FILE}")"
+    brightnessctl s "${brightness}%"
+}
+
+print-usage() {
+    echo 'usage: brightness-control.sh [up|down|set|restore|display] <ammount>' 1>&2
+    exit 1
+}
+
+if [ "$#" -lt 1 ]; then
+    print-usage
+fi
+
+ammount='5%'
+value='50%'
+if [ "${#}" -gt 1 ]; then
+    ammount="${2}"
+    value="${2}"
+fi
+
+case "${1}" in
+    'up')
+        brightnessctl s "+${ammount}" > /dev/null
+        notify-brightness
+        save-brightness
+        ;;
+    'down')
+        brightnessctl s "${ammount}-" > /dev/null
+        notify-brightness
+        save-brightness
+        ;;
+    'set')
+        brightnessctl s "${value}" > /dev/null
+        notify-brightness
+        save-brightness
+        ;;
+    'display')
+        notify-brightness
+        ;;
+    'restore')
+        restore-brightness
+        ;;
+    *)
+        print-usage
+        ;;
+esac