Fix power profile auto-switching on USB-C only machines (#5444)

* Fix power profile auto-switching on USB-C only machines

* Small nits

* Stick with single unit name

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

bin/omarchy-powerprofiles-set

@@ -1,11 +1,31 @@
 #!/bin/bash
 
 # omarchy:summary=Set the power profile to the requested level, falling back to balanced
-# omarchy:args=<ac|battery>
+# omarchy:args=[autodetect|ac|battery]
+
+action="${1-}"
+
+# Auto-detect when called with no argument: treat any Mains or USB
+# power-supply device reporting online=1 as "on AC". This handles
+# USB-C only laptops where the legacy AC device may not fire udev
+# events, and also avoids false negatives from per-port USB-C devices
+# that are present-but-empty (online=0) while another port supplies power.
+if [[ -z $action || $action == "autodetect" ]]; then
+  action=battery
+  for ps in /sys/class/power_supply/*; do
+    [[ -r $ps/online && -r $ps/type ]] || continue
+    type=$(cat "$ps/type")
+    [[ $type == "Mains" || $type == "USB" ]] || continue
+    if [[ $(cat "$ps/online") == "1" ]]; then
+      action=ac
+      break
+    fi
+  done
+fi
 
 mapfile -t profiles < <(powerprofilesctl list | awk '/^\s*[* ]\s*[a-zA-Z0-9\-]+:$/ { gsub(/^[*[:space:]]+|:$/,""); print }')
 
-case "$1" in
+case "$action" in
   ac)
     # Prefer performance, fall back to balanced
     if [[ " ${profiles[*]} " == *" performance "* ]]; then
@@ -17,4 +37,4 @@ case "$1" in
   battery)
     powerprofilesctl set balanced
     ;;
-esac
+esac