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#!/usr/bin/env bash
# this script was created in 3BBE.81[sft].
# usage:
# to convert to sfttime:
# $0 [c date] [digitcount] [nodate]
# if date is given, converts the given date to sfttime.
# if date is not given, converts the current date to sfttime.
# digitcount specifies the accuracy for the time part.
# nodate hides the date part.
# to convert from sfttime:
# $0 r sfttime [unix]
# converts the given sfttime to 'standard' time.
# if 'unix' is provided, the output will be in unix time.
# to show info about sfttime units
# $0 i [[sft]]$num
# displays name of unit [sft]$num, as well as it's value
# in both days and 'standard' units.
SFT_EPOCH_UNIX=49020
case $1 in
"c")
unixtime=$(date --date="$2" +%s.%N)
shift
shift
mode=fw
;;
"r")
shift
sfttime=$1
if [[ $sfttime =~ ^([0-9A-F]*(.[0-9A-F]+)?)(\[[sS][fF][tT]\])?$ ]] && [[ $sfttime ]]; then
sfttime=${BASH_REMATCH[1]}
else
echo "error" 2>&1
exit 1
fi
shift
mode=bw
;;
"i")
shift
inforeq=$1
if [[ $inforeq =~ ^(\[[sS][fF][tT]\])?(-?[0-9]+)$ ]]; then
inforeq=${BASH_REMATCH[2]}
let inforeq=$inforeq
mode=in
elif [[ $inforeq =~ ^(\[[sS][fF][tT]\])?[eE][pP][oO][cC][hH]$ ]]; then
echo "[sft]epoch:"
echo "unix time $SFT_EPOCH_UNIX"
echo "1970-01-01 13:37:00 UTC"
exit 0
else
echo "error" 2>&1
exit 1
fi
shift
mode=in
;;
*)
unixtime=$(date +%s.%N)
mode=fw
;;
esac
case $mode in
"fw")
sfttime=$(echo "obase=16; ($unixtime-$SFT_EPOCH_UNIX)/86400" | bc -l)
if [[ $1 -ge 1 ]]; then
digits=$1
shift
elif [[ ! $1 ]] || [[ $1 == nodate ]]; then
digits=3
else
digits=0
fi
if [[ $sfttime =~ ^([0-9A-F]+)[.]([0-9A-F]{$digits}).*$ ]]; then
date=${BASH_REMATCH[1]}
time=${BASH_REMATCH[2]}
else
echo "Error" &1>2
exit 1
fi
if [[ $digits -eq 0 ]]; then
echo "$date[sft]"
else
if [[ $1 == nodate ]]; then
echo ".$time[sft]"
shift
else
echo "$date.$time[sft]"
fi
fi
;;
"bw")
unixtime=$(echo "ibase=16; $sfttime*15180+BF7C" | bc -l)
case $1 in
unix)
shift
echo $unixtime
;;
*)
date --date="1970-01-01 $unixtime sec"
;;
esac
;;
"in")
name="[sft]$inforeq"
case $inforeq in
-4) newname="[sft]tick";;
-3) newname="[sft]tentacle";;
-2) newname="[sft]schinken";;
-1) newname="[sft]major";;
0) newname="day";;
1) newname="[sft]vergil";;
2) newname="[sft]stallman";;
3) newname="[sft]odin";;
esac
if [[ $newname ]]; then
echo "alternative name for $name: $newname"
name="$newname"
fi
one="1 $name"
echo "$one after [sft]epoch:"
sfttime=$(echo "obase=16; 16^$inforeq" | bc -l)[sft]
echo $sfttime
echo "time equivalent of $one:"
echo "the duration of $(echo 794243384928000*16^$inforeq | bc -l) periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom"
echo "standard time units equivalent:"
seconds=$(echo "86400*16^$inforeq" | bc -l)
if [[ $(echo "$seconds < 60" | bc -l) == 1 ]]; then
echo "$seconds seconds"
elif [[ $(echo "$seconds < 3600" | bc -l) == 1 ]]; then
echo "$(echo $seconds/60 | bc -l) minutes"
elif [[ $(echo "$seconds < 86400" | bc -l) == 1 ]]; then
echo "$(echo $seconds/3600 | bc -l) hours"
elif [[ $(echo "$seconds < 86400*365.2425" | bc -l) == 1 ]]; then
echo "$(echo $seconds/86400 | bc -l) days"
else
echo "$(echo $seconds/86400/365.2425 | bc -l) years"
fi
;;
esac
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