human readable uptime (osx)

uptime.fish

#!/usr/bin/env fish

set -l boottime_in_seconds (sysctl -n kern.boottime | rg '(?:\bsec\s+=\s+)(\d+)' --replace '$1' --only-matching)
set -l now_in_seconds (date +%s)
set -l seconds_elapsed (math $now_in_seconds - $boottime_in_seconds)
set -l uptime (awk -v seconds_elapsed=$seconds_elapsed '
  BEGIN {
    ONE_HOUR_IN_SECONDS = int(60 * 60);
    ONE_DAY_IN_SECONDS = int(24 * ONE_HOUR_IN_SECONDS);
    ONE_WEEK_IN_SECONDS = int(7 * ONE_DAY_IN_SECONDS);

    seconds = seconds_elapsed;

    weeks = int(seconds / ONE_WEEK_IN_SECONDS);
    seconds -= int(weeks * ONE_WEEK_IN_SECONDS);

    days = int(seconds / ONE_DAY_IN_SECONDS);
    seconds -= int(days * ONE_DAY_IN_SECONDS);

    hours = int(seconds / ONE_HOUR_IN_SECONDS);
    seconds -= int(hours * ONE_HOUR_IN_SECONDS);

    minutes = int(seconds / 60);
    seconds -= int(minutes * 60);

    if (weeks > 0)
      printf("%.0f weeks, %.0f days, %.0f hours, %.0f minutes, %.0f seconds", weeks, days, hours, minutes, seconds);
    else if (days > 0)
      printf("%.0f days, %.0f hours, %.0f minutes, %.0f seconds", days, hours, minutes, seconds);
    else if (hours > 0)
      printf("%.0f hours, %.0f minutes, %.0f seconds", hours, minutes, seconds);
    else
      printf("%.0f minutes, %.0f seconds", minutes, seconds);
    exit
  }'
)
printf "uptime: %s\n" $uptime