Waybar here i come (#58)

2026-08-21 10:45:49 +02:00 · 2026-08-13 13:55:30 +02:00
parent f1f22de7b7
commit 0cef4320fd
137 changed files with 3488 additions and 2941 deletions
@@ -0,0 +1,103 @@
+# battery-monitor: low-battery alerts for waybar/swaync.
+# Runs main once (triggered by the battery-monitor systemd timer).
+
+POWER_SUPPLY_DIR="${POWER_SUPPLY_DIR:-/sys/class/power_supply}"
+STATE_FILE="${BATTERY_STATE_FILE:-/tmp/battery-alert-state}"
+CRIT_ID_FILE="${BATTERY_CRIT_ID_FILE:-/tmp/battery-crit-id}"
+
+WARN_THRESHOLD=10
+CRIT_THRESHOLD=5
+
+# Pure decision. Prints "<action>:<newstate>".
+# action ∈ noop | osd_warn | crit_show | crit_clear ; state ∈ none | warn10 | crit5
+battery_decide() {
+  status=$1
+  cap=$2
+  prev=$3
+
+  if [ "$status" = "Discharging" ]; then
+    if [ "$cap" -le "$CRIT_THRESHOLD" ]; then
+      echo "crit_show:crit5"
+    elif [ "$cap" -le "$WARN_THRESHOLD" ]; then
+      if [ "$prev" = "crit5" ]; then
+        echo "crit_clear:warn10"
+      elif [ "$prev" = "warn10" ]; then
+        echo "noop:warn10"
+      else
+        echo "osd_warn:warn10"
+      fi
+    else
+      if [ "$prev" = "crit5" ]; then
+        echo "crit_clear:none"
+      else
+        echo "noop:none"
+      fi
+    fi
+  else
+    if [ "$prev" = "crit5" ]; then
+      echo "crit_clear:none"
+    else
+      echo "noop:none"
+    fi
+  fi
+}
+
+# First real battery (type == Battery, with status + capacity).
+resolve_battery() {
+  for d in "$POWER_SUPPLY_DIR"/*; do
+    [ -r "$d/type" ] || continue
+    [ "$(cat "$d/type")" = "Battery" ] || continue
+    [ -r "$d/status" ] && [ -r "$d/capacity" ] || continue
+    printf '%s' "$d"
+    return 0
+  done
+  return 1
+}
+
+show_warn_osd() {
+  waybar-osd "󰂃  Low battery · $1%"
+}
+
+show_crit_notification() {
+  cap=$1
+  id=$(cat "$CRIT_ID_FILE" 2>/dev/null || echo 0)
+  newid=$(notify-send --print-id --replace-id="$id" \
+    --urgency=critical --expire-time=0 \
+    "󰂃 Critical battery" "Battery at $cap%: plug in the charger")
+  printf '%s' "$newid" >"$CRIT_ID_FILE"
+}
+
+clear_crit_notification() {
+  id=$(cat "$CRIT_ID_FILE" 2>/dev/null || echo 0)
+  if [ "$id" != "0" ]; then
+    gdbus call --session \
+      --dest org.freedesktop.Notifications \
+      --object-path /org/freedesktop/Notifications \
+      --method org.freedesktop.Notifications.CloseNotification "$id" \
+      >/dev/null 2>&1 || true
+  fi
+  rm -f "$CRIT_ID_FILE"
+}
+
+main() {
+  dir=$(resolve_battery) || exit 0
+
+  status=$(cat "$dir/status")
+  cap=$(cat "$dir/capacity")
+  prev=$(cat "$STATE_FILE" 2>/dev/null || echo none)
+
+  result=$(battery_decide "$status" "$cap" "$prev")
+  action=${result%%:*}
+  newstate=${result##*:}
+
+  case "$action" in
+  osd_warn) show_warn_osd "$cap" ;;
+  crit_show) show_crit_notification "$cap" ;;
+  crit_clear) clear_crit_notification ;;
+  noop) : ;;
+  esac
+
+  printf '%s' "$newstate" >"$STATE_FILE"
+}
+
+main "$@"