From 3b59d9249a4adfb9f8a61c0135241c7a33a900d3 Mon Sep 17 00:00:00 2001
From: Kaan Genc <kaan@bgenc.net>
Date: Wed, 9 Mar 2022 22:01:45 -0500
Subject: [PATCH] backlight control

---
 .vscode/settings.json |  3 +++
 sway/backlight.py     | 44 +++++++++++++++++++++++++++++++++++++++++++
 sway/config           |  3 +++
 waybar/config         |  3 +++
 4 files changed, 53 insertions(+)
 create mode 100644 .vscode/settings.json
 create mode 100755 sway/backlight.py

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..44aef9f
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "python.formatting.provider": "black"
+}
\ No newline at end of file
diff --git a/sway/backlight.py b/sway/backlight.py
new file mode 100755
index 0000000..69e1642
--- /dev/null
+++ b/sway/backlight.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+import argparse
+from decimal import Clamped
+
+parser = argparse.ArgumentParser(
+    "backlight.py", description="Adjust backlight levels for intel backlight."
+)
+# You can either set min or max, or change some amount. Not all.
+group = parser.add_mutually_exclusive_group(required=False)
+group.add_argument(
+    "change",
+    type=int,
+    nargs="?",
+    help="The mount, as a percentage, to change the brightness by. Negative numbers lower brightness.",
+)
+group.add_argument(
+    "--max", action="store_true", help="Set the brightness to max possible."
+)
+group.add_argument("--off", action="store_true", help="Set the brightness to 0.")
+
+
+def backlight(file_name: str) -> str:
+    return f"/sys/class/backlight/intel_backlight/{file_name}"
+
+
+args = parser.parse_args()
+
+with open(backlight("max_brightness"), "r") as max_f:
+    max_brightness = int(max_f.read().strip())
+    with open(backlight("brightness"), "w+") as current_f:
+        current_brightness = int(current_f.read().strip())
+        if args.max:
+            current_f.write(str(max_brightness))
+        elif args.off:
+            current_f.write(str(0))
+        elif args.change:
+            percent = int(max_brightness / 100.0)
+            to = current_brightness + percent * args.change
+            # Make sure number is in bounds
+            # Bounding min at 1 to avoid fully shutting down screen without the off option
+            to = max(min(to, max_brightness), 1)
+            current_f.write(str(to))
+        else:
+            print(int((current_brightness / float(max_brightness)) * 100))
diff --git a/sway/config b/sway/config
index 2fa46b2..dfe7dea 100644
--- a/sway/config
+++ b/sway/config
@@ -243,6 +243,9 @@ bindsym $mod+c mode "screenshot"
     bindsym XF86AudioMute exec pactl set-sink-mute @DEFAULT_SINK@ toggle
     bindsym XF86AudioMicMute exec pactl set-source-mute @DEFAULT_SOURCE@ toggle
 
+    # Screen brightness
+    bindsym XF86MonBrightnessUp exec /home/kaan/.config/sway/backlight.py +5
+    bindsym XF86MonBrightnessDown exec /home/kaan/.config/sway/backlight.py -5
 
 #
 # Resizing containers:
diff --git a/waybar/config b/waybar/config
index c59135c..cc8c61e 100644
--- a/waybar/config
+++ b/waybar/config
@@ -66,6 +66,9 @@
         "device": "intel_backlight",
         "format": "{percent}% {icon}",
         "format-icons": ["", ""],
+        "on-scroll-up": "/home/kaan/.config/sway/backlight.py +1",
+        "on-scroll-down": "/home/kaan/.config/sway/backlight.py -1",
+        "on-click": "/home/kaan/.config/sway/backlight.py --off"
     },
     "pulseaudio": {
         // "scroll-step": 1, // %, can be a float