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#!/usr/bin/env bash
# ==================================================
# KoolDots (2026)
# Project URL: https://github.com/LinuxBeginnings
# License: GNU GPLv3
# SPDX-License-Identifier: GPL-3.0-or-later
# ==================================================
# WaybarCava.sh — safer single-instance handling, cleanup, and robustness
# Original concept by LinuxBeginnings; this variant focuses on lifecycle hardening.
set -euo pipefail
# Ensure cava exists
if ! command -v cava >/dev/null 2>&1; then
echo "cava not found in PATH" >&2
exit 1
fi
# Proactively reap any stale Waybar-spawned cava (unique temp conf names)
pkill -f 'waybar-cava\..*\.conf' 2>/dev/null || true
# 0..7 → ▁▂▃▄▅▆▇█
bar="▁▂▃▄▅▆▇█"
dict="s/;//g"
bar_length=${#bar}
for ((i = 0; i < bar_length; i++)); do
dict+=";s/$i/${bar:$i:1}/g"
done
# Single-instance guard (only kill our previous instance if it’s still alive)
RUNTIME_DIR="${XDG_RUNTIME_DIR:-/tmp}"
pidfile="$RUNTIME_DIR/waybar-cava.pid"
if [[ -f "$pidfile" ]]; then
oldpid="$(cat "$pidfile" || true)"
if [[ -n "$oldpid" ]] && kill -0 "$oldpid" 2>/dev/null; then
kill "$oldpid" 2>/dev/null || true
sleep 0.1 || true
fi
fi
printf '%d' $$ >"$pidfile"
# Unique temp config + cleanup on exit
config_file="$(mktemp "$RUNTIME_DIR/waybar-cava.XXXXXX.conf")"
cleanup() {
# Kill children (cava, sed) of this script, then remove files
pkill -P "$$" 2>/dev/null || true
rm -f "$config_file" "$pidfile"
}
trap cleanup EXIT INT TERM
cat >"$config_file" <<EOF
[general]
framerate = 30
bars = 10
[input]
method = pulse
source = auto
[output]
method = raw
raw_target = /dev/stdout
data_format = ascii
ascii_max_range = 7
EOF
# Stream cava output and translate digits 0..7 to bar glyphs
# (no exec: keep this shell as the parent so the trap can reap children)
cava -p "$config_file" | sed -u "$dict"
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