#!/usr/bin/env bash
# A live system dashboard in plain bash. Run it, watch it repaint
# flicker-free, ctrl-c to leave. `./dashboard.sh --once` prints one frame.
set -euo pipefail

render() {
    rat style --bold --foreground 212 'System dashboard'
    rat style --faint "$(date)"
    echo

    # Disk usage: df rows become one aligned block of threshold-colored bars.
    df -Pk / 2>/dev/null | awk 'NR == 2 {
        printf "disk /\t%d\t%d\n", ($3 / 1024 / 1024), (($3 + $4) / 1024 / 1024)
    }' | rat bar --width 24 --thresholds '70:42,90:214,100:196' --annotation percent

    # A simulated deploy that animates with the clock.
    step=$(( $(date +%s) % 120 ))
    rat bar --label 'deploy (simulated)' --value "$step" --total 120 \
        --width 24 --state "$(rat duration $((120 - step)))"' left'

    # Load averages as a sparkline.
    printf 'load  '
    uptime | sed 's/.*load average[s]*: //' | tr -d ',' | rat spark --min 0
    echo

    rat log --level info "frame rendered $(rat date --relative "$(date +%s)")"
}

case "${1:-}" in
    --render|--once) render ;;
    *) exec rat watch --clear --interval 2s -- "$0" --render ;;
esac