i3status-rust: the bars as a module, claiming node-bar (hq ADR 0208)

Owns both bars and their icons, the bar blocks as an i3 drop-in; the battery,
GPU and headset blocks leave (hardware and a person's devices), the weather needs
no key; the update count and the bar watchdog become module code, the watchdog
started once per session. Go tools reload, blocks, block-run and themes.

modules/i3status-rust/files/bin/i3bar-watchdog

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# i3bar-watchdog [session-pid] (module i3status-rust, novox/hq ADR 0208): respawns a bar that died.
+#
+# i3 starts one i3bar per `bar { }` block and never restarts one that exits, and a reload does not
+# either. Changing the monitor setup reliably kills the bar that owns the tray. This brings back the
+# one missing i3bar, without restarting i3, and logs the outputs at that moment: the evidence for the
+# cause, which is i3bar's.
+#
+# Started once per session from the session's start, with the session's own pid; it ends when that
+# process does. Adopted from the predecessor's i3-bar-watchdog user unit of 2026-10-04.
+set -uo pipefail
+
+session_pid="${1:-}"
+interval="${I3_BAR_WATCHDOG_INTERVAL:-5}"
+# Two misses in a row before acting: an i3 restart tears every bar down and starts them again.
+confirm="${I3_BAR_WATCHDOG_CONFIRM:-2}"
+# Never respawn the same bar more often than this, so a bar that dies at once is not a tight loop.
+cooldown="${I3_BAR_WATCHDOG_COOLDOWN:-30}"
+
+log() { printf 'i3bar-watchdog: %s\n' "$*" >&2; }
+
+for tool in i3-msg i3bar pgrep; do
+	command -v "$tool" >/dev/null 2>&1 || {
+		log "$tool is missing; not watching"
+		exit 1
+	}
+done
+
+declare -A missed=() fixed=()
+
+bar_ids() { i3-msg -t get_bar_config 2>/dev/null | grep -oE '"[^"]+"' | tr -d '"'; }
+outputs() { xrandr --listmonitors 2>/dev/null | tail -n +2 | awk '{print $2" "$3}' | tr '\n' ' '; }
+session_alive() { [ -z "$session_pid" ] || kill -0 "$session_pid" 2>/dev/null; }
+
+while session_alive; do
+	sleep "$interval"
+	socket="$(i3 --get-socketpath 2>/dev/null)"
+	[ -n "$socket" ] && [ -S "$socket" ] || continue
+	ids="$(bar_ids)"
+	[ -n "$ids" ] || continue
+	while read -r id; do
+		[ -n "$id" ] || continue
+		if pgrep -u "$EUID" -f -- "i3bar --bar_id=$id" >/dev/null 2>&1; then
+			missed[$id]=0
+			continue
+		fi
+		missed[$id]=$((${missed[$id]:-0} + 1))
+		[ "${missed[$id]}" -ge "$confirm" ] || continue
+		now="$(date +%s)"
+		if [ $((now - ${fixed[$id]:-0})) -lt "$cooldown" ]; then
+			continue
+		fi
+		log "$id is gone; respawning it. Outputs now: $(outputs)"
+		nohup i3bar --bar_id="$id" --socket="$socket" >/dev/null 2>&1 &
+		disown 2>/dev/null || true
+		fixed[$id]="$now"
+		sleep 2
+		if pgrep -u "$EUID" -f -- "i3bar --bar_id=$id" >/dev/null 2>&1; then
+			missed[$id]=0
+		else
+			log "$id exited within 2s of respawning; check its status_command"
+		fi
+	done <<<"$ids"
+done

modules/i3status-rust/files/bin/i3status-updates

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+#!/usr/bin/env bash
+# i3status-updates [threshold] (module i3status-rust, novox/hq ADR 0208): the pending updates, for
+# the bottom bar's custom block (json = true). Emits one JSON line.
+#
+# Adopted from the operator's pkg-updates of 2026-10-04. The native `packages` block showed a raw
+# red error on every transient network failure, which on a roaming laptop is often. This keeps the
+# last good result through a failure and shows an error only after `threshold` failures in a row
+# (default 10). Official packages through checkupdates (pacman-contrib, a temporary database, no
+# root); AUR packages through paru when it is installed, and none counted when it is not.
+set -uo pipefail
+
+threshold="${1:-10}"
+icon="update"
+state_dir="${XDG_RUNTIME_DIR:-/tmp}/i3status-updates"
+mkdir -p "$state_dir"
+last="$state_dir/last_good.json"
+failures="$state_dir/failures"
+
+json() { printf '{"icon":"%s","state":"%s","text":"%s","short_text":"%s"}' "$icon" "$1" "$2" "$3"; }
+count() { [ -n "$1" ] && printf '%s\n' "$1" | grep -c . || echo 0; }
+
+official="$(checkupdates 2>/dev/null)"
+official_rc=$?
+aur="" aur_rc=0
+if command -v paru >/dev/null 2>&1; then
+	aur="$(paru -Qua 2>/dev/null)"
+	aur_rc=$?
+fi
+
+# checkupdates: 0 updates listed, 2 none pending; anything else is a failure.
+if { [ "$official_rc" -eq 0 ] || [ "$official_rc" -eq 2 ]; } && [ "$aur_rc" -eq 0 ]; then
+	o="$(count "$official")"
+	a="$(count "$aur")"
+	total=$((o + a))
+	if [ "$total" -eq 0 ]; then
+		payload="$(json Good "up to date" "")"
+	else
+		# A kernel update wants a reboot: the one worth not putting off.
+		state=Info
+		printf '%s\n' "$official" | grep -qE '^(linux|linux-lts|linux-zen) ' && state=Warning
+		label="$o + $a = $total updates"
+		[ "$a" -eq 0 ] && label="$total updates"
+		[ "$total" -eq 1 ] && label="1 update"
+		payload="$(json "$state" "$label" "$total")"
+	fi
+	printf '%s' "$payload" >"$last"
+	printf '0' >"$failures"
+	printf '%s\n' "$payload"
+	exit 0
+fi
+
+n=$(($(cat "$failures" 2>/dev/null || echo 0) + 1))
+printf '%s' "$n" >"$failures"
+if [ "$n" -ge "$threshold" ]; then
+	json Critical "update check failing (${n}x)" "!"
+	echo
+elif [ -s "$last" ]; then
+	cat "$last"
+	echo
+else
+	json Idle "" ""
+	echo
+fi