hyprland + waybar + GTK (Catpuccin)

theme_oomox/scripts/darker.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -ueo pipefail
+#set -x
+
+darker_channel() {
+  value="$1"
+  light_delta="$2"
+  value_int="$(bc <<< "ibase=16; $value")"
+  result="$(bc <<< "$value_int - $light_delta")"
+  if [[ "$result" -lt 0 ]]; then
+    result=0
+  fi
+  if [[ "$result" -gt 255 ]]; then
+    result=255
+  fi
+  echo "$result"
+}
+
+darker() {
+  hexinput="$(tr '[:lower:]' '[:upper:]' <<< "$1")"
+  light_delta="${2-10}"
+
+  a="$(cut -c-2 <<< "$hexinput")"
+  b="$(cut -c3-4 <<< "$hexinput")"
+  c="$(cut -c5-6 <<< "$hexinput")"
+
+  r="$(darker_channel "$a" "$light_delta")"
+  g="$(darker_channel "$b" "$light_delta")"
+  b="$(darker_channel "$c" "$light_delta")"
+
+  printf '%02x%02x%02x\n' "$r" "$g" "$b"
+}
+
+darker "$@"