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