nixos/quickshell/notif-pid-monitor.sh

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#!/usr/bin/env bash
# Monitors D-Bus for org.freedesktop.Notifications.Notify method calls.
# For each notification, captures the sender process PID and outputs:
# <notification-id>:<sender-pid>
# Quickshell reads this to know which process originated each notification,
# allowing it to walk the /proc tree and focus the exact window that sent it.
get_pid() {
busctl call org.freedesktop.DBus /org/freedesktop/DBus \
org.freedesktop.DBus GetConnectionUnixProcessID s "$1" 2>/dev/null \
| awk '{print $2}'
}
# Maps serial → pid so concurrent notifications don't clobber each other.
declare -A pending_pids
awaiting_nid=false
pending_pid=""
dbus-monitor --session "dest='org.freedesktop.Notifications'" 2>/dev/null | \
while IFS= read -r line; do
line="${line#"${line%%[![:space:]]*}"}" # trim leading whitespace
if [[ "$line" == *"method call"* && "$line" == *"member=Notify"* ]]; then
if [[ "$line" =~ sender=([^[:space:],;]+) ]]; then sender="${BASH_REMATCH[1]}"; fi
if [[ "$line" =~ serial=([0-9]+) ]]; then serial="${BASH_REMATCH[1]}"; fi
if [[ "$sender" == :* && -n "$serial" ]]; then
pid=$(get_pid "$sender")
if [[ -n "$pid" && "$pid" != "0" ]]; then
pending_pids["$serial"]="$pid"
fi
fi
elif [[ "$line" == *"method return"* ]]; then
if [[ "$line" =~ reply_serial=([0-9]+) ]]; then
reply="${BASH_REMATCH[1]}"
if [[ -n "${pending_pids[$reply]}" ]]; then
awaiting_nid=true
pending_pid="${pending_pids[$reply]}"
unset "pending_pids[$reply]"
fi
fi
elif [[ "$awaiting_nid" == true ]]; then
if [[ "$line" =~ ^uint32[[:space:]]+([0-9]+) ]]; then
echo "${BASH_REMATCH[1]}:${pending_pid}"
awaiting_nid=false
pending_pid=""
elif [[ -n "$line" ]]; then
awaiting_nid=false
fi
fi
done