#!/bin/bash
# Desc: Template to indicate time duration in ISO-8601 format
yell() { echo "$0: $*" >&2; } # Yell, Die, Try Three-Fingered Claw technique; # Ref/Attrib: https://stackoverflow.com/a/25515370
die() { yell "$*"; exit 111; }
try() { "$@" || die "cannot $*"; }
timeDuration(){
# Desc: Given seconds, output ISO-8601 duration string
# Ref/Attrib: ISO-8601:2004(E), §4.4.4.2 Representations of time intervals by duration and context information
# Note: "1 month" ("P1M") is assumed to be "30 days" (see ISO-8601:2004(E), §2.2.1.2)
# Usage: timeDuration [1:seconds] ([2:precision])
# Version: 1.0.3
# Input: arg1: seconds as base 10 integer >= 0 (ex: 3601)
# arg2: precision level (optional; default=2)
# Output: stdout: ISO-8601 duration string (ex: "P1H1S", "P2Y10M15DT10H30M20S")
# exit code 0: success
# exit code 1: error_input
# exit code 2: error_unknown
# Example: 'timeDuration 111111 3' yields 'P1DT6H51M'
# Depends: date 8 (gnucoreutils), yell,
local returnState argSeconds argPrecision remainder precision witherPrecision
local fullYears fullMonths fullDays fullHours fullMinutes fullSeconds
local displayYears displayMonths displayDays displayHours displayMinutes displaySeconds
local hasYears hasMonths hasDays hasHours hasMinutes hasSeconds
argSeconds="$1"; # read arg1 (seconds)
argPrecision="$2"; # read arg2 (precision)
precision=2; # set default precision
# Check that between one and two arguments is supplied
if ! { [[ $# -ge 1 ]] && [[ $# -le 2 ]]; }; then
yell "ERROR:Invalid number of arguments:$# . Exiting.";
returnState="error_input"; fi
# Check that argSeconds provided
if [[ $# -ge 1 ]]; then
## Check that argSeconds is a positive integer
if [[ "$argSeconds" =~ ^[[:digit:]]+$ ]]; then
:
else
yell "ERROR:argSeconds not a digit.";
returnState="error_input";
fi
else
yell "ERROR:No argument provided. Exiting.";
exit 1;
fi
# Consider whether argPrecision was provided
if [[ $# -eq 2 ]]; then
# Check that argPrecision is a positive integer
if [[ "$argPrecision" =~ ^[[:digit:]]+$ ]] && [[ "$argPrecision" -gt 0 ]]; then
precision="$argPrecision";
else
yell "ERROR:argPrecision not a positive integer. (is $argPrecision ). Leaving early.";
returnState="error_input";
fi;
else
:
fi;
remainder="$argSeconds" ; # seconds
## Calculate full years Y, update remainder
fullYears=$(( remainder / (365*24*60*60) ));
remainder=$(( remainder - (fullYears*365*24*60*60) ));
## Calculate full months M, update remainder
fullMonths=$(( remainder / (30*24*60*60) ));
remainder=$(( remainder - (fullMonths*30*24*60*60) ));
## Calculate full days D, update remainder
fullDays=$(( remainder / (24*60*60) ));
remainder=$(( remainder - (fullDays*24*60*60) ));
## Calculate full hours H, update remainder
fullHours=$(( remainder / (60*60) ));
remainder=$(( remainder - (fullHours*60*60) ));
## Calculate full minutes M, update remainder
fullMinutes=$(( remainder / (60) ));
remainder=$(( remainder - (fullMinutes*60) ));
## Calculate full seconds S, update remainder
fullSeconds=$(( remainder / (1) ));
remainder=$(( remainder - (remainder*1) ));
## Check which fields filled
if [[ $fullYears -gt 0 ]]; then hasYears="true"; else hasYears="false"; fi
if [[ $fullMonths -gt 0 ]]; then hasMonths="true"; else hasMonths="false"; fi
if [[ $fullDays -gt 0 ]]; then hasDays="true"; else hasDays="false"; fi
if [[ $fullHours -gt 0 ]]; then hasHours="true"; else hasHours="false"; fi
if [[ $fullMinutes -gt 0 ]]; then hasMinutes="true"; else hasMinutes="false"; fi
if [[ $fullSeconds -gt 0 ]]; then hasSeconds="true"; else hasSeconds="false"; fi
## Determine which fields to display (see ISO-8601:2004 §4.4.3.2)
witherPrecision="false"
### Years
if $hasYears && [[ $precision -gt 0 ]]; then
displayYears="true";
witherPrecision="true";
else
displayYears="false";
fi;
if $witherPrecision; then ((precision--)); fi;
### Months
if $hasMonths && [[ $precision -gt 0 ]]; then
displayMonths="true";
witherPrecision="true";
else
displayMonths="false";
fi;
if $witherPrecision && [[ $precision -gt 0 ]]; then
displayMonths="true";
fi;
if $witherPrecision; then ((precision--)); fi;
### Days
if $hasDays && [[ $precision -gt 0 ]]; then
displayDays="true";
witherPrecision="true";
else
displayDays="false";
fi;
if $witherPrecision && [[ $precision -gt 0 ]]; then
displayDays="true";
fi;
if $witherPrecision; then ((precision--)); fi;
### Hours
if $hasHours && [[ $precision -gt 0 ]]; then
displayHours="true";
witherPrecision="true";
else
displayHours="false";
fi;
if $witherPrecision && [[ $precision -gt 0 ]]; then
displayHours="true";
fi;
if $witherPrecision; then ((precision--)); fi;
### Minutes
if $hasMinutes && [[ $precision -gt 0 ]]; then
displayMinutes="true";
witherPrecision="true";
else
displayMinutes="false";
fi;
if $witherPrecision && [[ $precision -gt 0 ]]; then
displayMinutes="true";
fi;
if $witherPrecision; then ((precision--)); fi;
### Seconds
if $hasSeconds && [[ $precision -gt 0 ]]; then
displaySeconds="true";
witherPrecision="true";
else
displaySeconds="false";
fi;
if $witherPrecision && [[ $precision -gt 0 ]]; then
displaySeconds="true";
fi;
if $witherPrecision; then ((precision--)); fi;
## Determine whether or not the "T" separator is needed to separate date and time elements
if ( $displayHours || $displayMinutes || $displaySeconds); then
displayDateTime="true"; else displayDateTime="false"; fi
## Construct duration output string
OUTPUT="P"
if $displayYears; then
OUTPUT=$OUTPUT$fullYears"Y"; fi
if $displayMonths; then
OUTPUT=$OUTPUT$fullMonths"M"; fi
if $displayDays; then
OUTPUT=$OUTPUT$fullDays"D"; fi
if $displayDateTime; then
OUTPUT=$OUTPUT"T"; fi
if $displayHours; then
OUTPUT=$OUTPUT$fullHours"H"; fi
if $displayMinutes; then
OUTPUT=$OUTPUT$fullMinutes"M"; fi
if $displaySeconds; then
OUTPUT=$OUTPUT$fullSeconds"S"; fi
## Output duration string to stdout
echo "$OUTPUT" && returnState="true";
#===Determine function return code===
if [ "$returnState" = "true" ]; then
return 0;
elif [ "$returnState" = "error_input" ]; then
yell "ERROR:input";
return 1;
else
yell "ERROR:Unknown";
return 2;
fi
} # Get duration (ex: PT10M4S )
#==BEGIN sample code==
echo "Precision 6 duration:$(timeDuration "$(date +%s)" 6)"
echo "Precision 5 duration:$(timeDuration "$(date +%s)" 5)"
echo "Precision 4 duration:$(timeDuration "$(date +%s)" 4)"
echo "Precision 3 duration:$(timeDuration "$(date +%s)" 3)"
echo "Precision 2 duration:$(timeDuration "$(date +%s)" 2)"
echo "Precision 1 duration:$(timeDuration "$(date +%s)" 1)"
echo "Precision 6 duration:$(timeDuration $((60+60*60+60*60*24+60*60*24*30+60*60*24*365 - (60+60*60+60*60*24+60*60*24*30) )) 6)"
timeDuration "$@"
#==END sample code==
# Author: Steven Baltakatei Sandoval
# License: GPLv3+