feat(unitproc):Add function writeArg for writing Bash vars to disk
[BK-2020-03.git] / unitproc / bktemp-timeUntilNextDay
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CommitLineData
1#!/bin/bash
2# Desc: Template to report seconds until beginning of next day
3# Author: Steven Baltaktei Sandoval; License: GPLv3+
4
5#==BEGIN Define script parameters==
6#===BEGIN Declare local script functions===
7yell() { echo "$0: $*" >&2; } # Yell, Die, Try Three-Fingered Claw technique; # Ref/Attrib: https://stackoverflow.com/a/25515370
8die() { yell "$*"; exit 111; }
9try() { "$@" || die "cannot $*"; }
10timeUntilNextDay(){
11 # Desc: Report seconds until next day.
12 # Output: stdout: integer seconds until next day
13 # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
14 # Usage: timeUntilNextDay
15 # Usage: if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
16 local returnState TIME_CURRENT TIME_NEXT_DAY SECONDS_UNTIL_NEXT_DAY
17 TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
18 TIME_NEXT_DAY="$(date -d "$TIME_CURRENT next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
19 SECONDS_UNTIL_NEXT_DAY="$(( $(date +%s -d "$TIME_NEXT_DAY") - $(date +%s -d "$TIME_CURRENT") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
20 if [[ "$SECONDS_UNTIL_NEXT_DAY" -gt 0 ]]; then
21 returnState="true";
22 elif [[ "$SECONDS_UNTIL_NEXT_DAY" -eq 0 ]]; then
23 returnState="WARNING_ZERO";
24 yell "WARNING:Reported time until next day exactly zero.";
25 elif [[ "$SECONDS_UNTIL_NEXT_DAY" -lt 0 ]]; then
26 returnState="WARNING_NEGATIVE";
27 yell "WARNING:Reported time until next day is negative.";
28 fi
29
30 try echo "$SECONDS_UNTIL_NEXT_DAY"; # Report
31
32 #===Determine function return code===
33 if [[ "$returnState" = "true" ]]; then
34 return 0;
35 elif [[ "$returnState" = "WARNING_ZERO" ]]; then
36 return 1;
37 elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
38 return 2;
39 fi
40} # Report seconds until next day
41#===END Declare local script functions===
42#==END Define script parameters==
43
44
45#==BEGIN sample code==
46try echo "Time until next day (seconds):$(timeUntilNextDay)" # simple report
47
48if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement for myTTL:$myTTL"; exit 1; fi # Use of exit code to exit early if time <= 0.
49#==END sample code==