From ad845936d08edda9b3eebad6e720dd291ba55ef4 Mon Sep 17 00:00:00 2001
From: Michael Bradley <michaelmbrad@gmail.com>
Date: Thu, 27 Mar 2025 01:02:04 -0400
Subject: [PATCH] Make Hyprsunset slowly change temperature throughout day

---
 README.md              |  2 --
 bombadil.toml          |  4 ++-
 scripts/screenshot.sh  |  3 --
 scripts/sunset.sh      | 64 ++++++++++++++++++++++++++++++++++++++++++
 systemd/sunset.service |  6 ++++
 systemd/sunset.timer   | 11 ++++++++
 6 files changed, 84 insertions(+), 6 deletions(-)
 create mode 100755 scripts/sunset.sh
 create mode 100644 systemd/sunset.service
 create mode 100644 systemd/sunset.timer

diff --git a/README.md b/README.md
index d15dc3d..6b9c1ef 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,6 @@ The dotfiles are managed with [TOML Bombadil](https://github.com/oknozor/toml-bo
 
 ## TODO
 
-* hyprsunset
-	* Ramp throughout day
 * Wallpaper
 	* Adjust to time of day
 	* Make sure changed wallpaper is new
diff --git a/bombadil.toml b/bombadil.toml
index 823e3af..9810c71 100644
--- a/bombadil.toml
+++ b/bombadil.toml
@@ -21,10 +21,12 @@ megasync = { source = "autostart/megasync.desktop", target = ".config/autostart/
 
 git = { source = "git/config", target = ".config/git/config" }
 
-# Also needs a one-time `systemctl --user enable --now eww-daemon.service eww-bars.service ip-geolocation.service swww-daemon.service'
+# Also needs a one-time `systemctl --user enable --now eww-daemon.service eww-bars.service ip-geolocation.service sunset.timer swww-daemon.service'
 eww-daemon = { source = "systemd/eww-daemon.service", target = ".config/systemd/user/eww-daemon.service" }
 eww-bars = { source = "systemd/eww-bars.service", target = ".config/systemd/user/eww-bars.service" }
 ip-geolocation = { source = "systemd/ip-geolocation.service", target = ".config/systemd/user/ip-geolocation.service" }
+sunset-service = { source = "systemd/sunset.service", target = ".config/systemd/user/sunset.service" }
+sunset-timer = { source = "systemd/sunset.timer", target = ".config/systemd/user/sunset.timer" }
 swww-daemon = { source = "systemd/swww-daemon.service", target = ".config/systemd/user/swww-daemon.service" }
 
 btop = { source = "btop", target = ".config/btop" }
diff --git a/scripts/screenshot.sh b/scripts/screenshot.sh
index 5cd8197..b210fd9 100755
--- a/scripts/screenshot.sh
+++ b/scripts/screenshot.sh
@@ -1,8 +1,5 @@
 #!/bin/env sh
 
 if [ "$(pidof slurp)" = "" ]; then
-  hyprshade off
   grimblast copy area
-  hyprshade auto
 fi
-
diff --git a/scripts/sunset.sh b/scripts/sunset.sh
new file mode 100755
index 0000000..873db0f
--- /dev/null
+++ b/scripts/sunset.sh
@@ -0,0 +1,64 @@
+#!/bin/env sh
+
+SUNRISE_START="$((5 * 60 * 60))"  # When to start turning up temperature
+SUNRISE_END="$((7 * 60 * 60))"  # When to reach max temperature
+
+SUNSET_START="$((21 * 60 * 60))"  # When to start turning down temperature
+SUNSET_END="$((23 * 60 * 60))"  # When to reach min temperature
+
+DAY_TEMP="6000"  # Display temperature (K) to use in full daylight
+NIGHT_TEMP="2400"  # Display temperature (K) to use at night
+
+CURRENT="$(((($(date '+%H') * 60) + $(date '+%M')) * 60 + $(date '+%S')))"  # Time in seconds since start of day
+
+# Performs a calculation using an argument containing an input string
+calc() {
+  echo "scale=4; $1" | bc
+}
+
+# Evaluates a boolean expression on an argument containing an input string
+bool() {
+  echo "scale=1; $1" | bc
+}
+
+# GLSL Smoothstep, takes a single number as an argument
+smoothstep() {
+  if [ "$(bool "$1 <= 0")" = "1" ]; then
+    echo 0
+  elif [ "$(bool "$1 >= 1")" = "1" ]; then
+    echo 1
+  else
+    calc "$1 * $1 * (3 - 2 * $1)"
+  fi
+}
+
+# Interpolates between the 4th and 5th arguments based on the value of the 2nd in relation to the 1st and 3rd
+interpolate() {
+  LOWER_IN="$1"
+  VALUE="$2"
+  UPPER_IN="$3"
+  LOWER_OUT="$4"
+  UPPER_OUT="$5"
+
+  if [ "$((VALUE <= LOWER_IN))" = "1" ]; then
+    echo "$LOWER_OUT"
+  elif [ "$((VALUE < UPPER_IN))" = "1" ]; then
+    calc "$LOWER_OUT + (($UPPER_OUT - $LOWER_OUT) * $(smoothstep "$(calc "($VALUE - $LOWER_IN) / ($UPPER_IN - $LOWER_IN)")"))"
+  else
+    echo "$UPPER_OUT"
+  fi
+}
+
+if [ "$((CURRENT <= SUNRISE_START))" = "1" ]; then
+  TEMP="$NIGHT_TEMP"
+elif [ "$((CURRENT < SUNRISE_END))" = "1" ]; then
+  TEMP="$(interpolate "$SUNRISE_START" "$CURRENT" "$SUNRISE_END" "$NIGHT_TEMP" "$DAY_TEMP")"
+elif [ "$((CURRENT <= SUNSET_START))" = "1" ]; then
+  TEMP="$DAY_TEMP"
+elif [ "$((CURRENT < SUNSET_END))" = "1" ]; then
+  TEMP="$(interpolate "$SUNSET_START" "$CURRENT" "$SUNSET_END" "$DAY_TEMP" "$NIGHT_TEMP")"
+else
+  TEMP="$NIGHT_TEMP"
+fi
+
+hyprctl hyprsunset temperature "$TEMP"
diff --git a/systemd/sunset.service b/systemd/sunset.service
new file mode 100644
index 0000000..4fa5f55
--- /dev/null
+++ b/systemd/sunset.service
@@ -0,0 +1,6 @@
+[Unit]
+Description=Sets the monitor temperature based on the time of day
+
+[Service]
+Type=oneshot
+ExecStart=/home/mbradley/scripts/sunset.sh
diff --git a/systemd/sunset.timer b/systemd/sunset.timer
new file mode 100644
index 0000000..2f2da6c
--- /dev/null
+++ b/systemd/sunset.timer
@@ -0,0 +1,11 @@
+[Unit]
+Description=Changes the monitor temperature over the course of the day to ease eye strain
+After=graphical-session.target
+After=hyprsunset.service
+
+[Timer]
+OnCalendar=*-*-* *:*:00
+Persistent=true
+
+[Install]
+WantedBy=timers.target