#!/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: Output approximate time duration string before given time (default:current date) # 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 [arg1] ([arg2]) # Version: 1.0.1 # 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") # Example: 'timeDuration 111111 3' yields 'P1DT6H51M' # Depends: date 8 (gnucoreutils), yell, local returnState ARG1 ARG2 remainder precision witherPrecision local fullYears fullMonths fullDays fullHours fullMinutes fullSeconds local displayYears displayMonths displayDays displayHours displayMinutes displaySeconds local hasYears hasMonths hasDays hasHours hasMinutes hasSeconds ARG1="$1"; ARG2="$2"; precision=2; # set default precision returnState="true"; # set default return state # 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 arg1 provided if [[ $# -ge 1 ]]; then ## Check that arg1 is a positive integer if [[ "$ARG1" =~ ^[[:digit:]]+$ ]]; then : else yell "ERROR:ARG1 not a digit."; returnState="ERROR_INPUT"; fi else yell "ERROR:No argument provided. Exiting."; exit 1; fi # Consider whether arg2 was provided if [[ $# -eq 2 ]]; then # Check that the second arg is a positive integer if [[ "$ARG2" =~ ^[[:digit:]]+$ ]] && [[ "$ARG2" -gt 0 ]]; then precision="$ARG2"; else yell "ERROR:ARG2 not a positive integer. (is $ARG2 ). Leaving early."; returnState="ERROR_INPUT"; fi; else : fi; remainder="$ARG1" ; # 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$fullSeconds"S"; fi ## Output duration string to stdout if [[ "$returnState" = "true" ]]; then echo "$OUTPUT"; fi #===Determine function return code=== if [ "$returnState" = "true" ]; then return 0; else echo "$returnState" 1>&2; return 1; fi } # Get duration (ex: PT10M4S ) #==BEGIN sample code== echo "Precision 6 duration:$(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+