| 1 | #!/usr/bin/env bash |
| 2 | set -euo pipefail |
| 3 | |
| 4 | CPU_USAGE=0.0 |
| 5 | SLEEP_AFTER=4 |
| 6 | |
| 7 | AWAKE_FRAMES=($(eval echo {A..E})) |
| 8 | SLEEP_FRAMES=($(eval echo {G..N})) |
| 9 | |
| 10 | COUNT=0 |
| 11 | |
| 12 | read_cpu() { |
| 13 | awk '/^cpu /{ |
| 14 | user=$2; nice=$3; sys=$4; idle=$5; |
| 15 | active = user + nice + sys; |
| 16 | total = active + idle; |
| 17 | printf "%d %d\n", active, total; |
| 18 | exit |
| 19 | }' /proc/stat |
| 20 | } |
| 21 | |
| 22 | read prev_active prev_total < <(read_cpu) |
| 23 | |
| 24 | while true; do |
| 25 | |
| 26 | read active total < <(read_cpu) |
| 27 | |
| 28 | delta_active=$((active - prev_active)) |
| 29 | delta_total=$((total - prev_total)) |
| 30 | |
| 31 | if [ "$delta_total" -le 0 ] || [ "$delta_active" -lt 0 ]; then |
| 32 | utilization="0.0000" |
| 33 | else |
| 34 | utilization=$(awk -v a="$delta_active" -v t="$delta_total" 'BEGIN { printf "%.4f", (a / t) }') |
| 35 | fi |
| 36 | |
| 37 | CPU_USAGE=$utilization |
| 38 | |
| 39 | SPEED=$(awk -v u="$CPU_USAGE" 'BEGIN { printf "%.2f", 1 / (4 + (u * 100)) }') |
| 40 | # clip minimum speed |
| 41 | if (( $(echo "$SPEED < 0.03" | bc -l) )); then |
| 42 | SPEED=0.03 |
| 43 | fi |
| 44 | |
| 45 | ### MAKE THE CAT SLEEP IF CPU USAGE IS LOW after SLEEP_AFTER ### |
| 46 | if (( $(echo "$CPU_USAGE < 0.02" | bc -l) )); then |
| 47 | COUNT=$((COUNT + 1)) |
| 48 | else |
| 49 | COUNT=0 |
| 50 | fi |
| 51 | |
| 52 | ### CAT IS SLEEPING ### |
| 53 | if [ $COUNT -ge $SLEEP_AFTER ]; then |
| 54 | for s in "${SLEEP_FRAMES[@]}";do |
| 55 | echo $s |
| 56 | sleep $SPEED |
| 57 | done |
| 58 | |
| 59 | ### CAT IS AWAKE ### |
| 60 | else |
| 61 | for i in "${AWAKE_FRAMES[@]}";do |
| 62 | echo $i |
| 63 | sleep $SPEED |
| 64 | done |
| 65 | |
| 66 | fi |
| 67 | |
| 68 | prev_active=$active |
| 69 | prev_total=$total |
| 70 | done |
| 71 | |
| 72 | # vim: set ts=2 sw=2 |