init

.config/i3blocks/key_light/README.md

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+# key_light
+
+Control the keyboard backlight. When clicked, the keyboard backlight is
+increased until the maximum level is reached after which the backlight is
+turned off.
+
+![](key_light.png)
+
+# Dependencies
+
+* [upower](https://upower.freedesktop.org/)
+
+# Config
+
+```
+[key_light]
+full_text=⌨
+command=$SCRIPT_DIR/key_light
+```

.config/i3blocks/key_light/i3blocks.conf

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+[key_light]
+full_text=⌨
+command=$SCRIPT_DIR/key_light/key_light

.config/i3blocks/key_light/key_light

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+#!/usr/bin/env bash
+
+# Copyright 2019 Matej Čamaj <camaj at protonmail dot com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# See https://upower.freedesktop.org/docs/KbdBacklight.html
+function get_brightness {
+    dbus-send --system --type=method_call --print-reply\
+        --dest="org.freedesktop.UPower" \
+        "/org/freedesktop/UPower/KbdBacklight" \
+        "org.freedesktop.UPower.KbdBacklight.$1" \
+        |  awk 'FNR==2{print $2}'
+}
+
+brightness=$(get_brightness "GetBrightness")
+max_brightness=$(get_brightness "GetMaxBrightness")
+
+if [ "$brightness" -eq "$max_brightness" ]; then
+   new_brightness=0
+else
+   new_brightness=$((brightness + 1))
+fi
+
+dbus-send --system --type=method_call \
+    --dest="org.freedesktop.UPower" \
+    "/org/freedesktop/UPower/KbdBacklight" \
+    "org.freedesktop.UPower.KbdBacklight.SetBrightness" int32:$new_brightness