experimental notification focus

quickshell/notif-pid-monitor.sh

@@ -0,0 +1,53 @@
+#!/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