#!/bin/bash
# Desc: Template to report seconds until beginning of next day
-# Author: Steven Baltaktei Sandoval; License: GPLv3+
#==BEGIN Define script parameters==
#===BEGIN Declare local script functions===
try() { "$@" || die "cannot $*"; }
timeUntilNextDay(){
# Desc: Report seconds until next day.
+ # Version: 1.0.1
# Output: stdout: integer seconds until next day
# Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
# Usage: timeUntilNextDay
# Usage: if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
- local returnState TIME_CURRENT TIME_NEXT_DAY SECONDS_UNTIL_NEXT_DAY
- TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
- TIME_NEXT_DAY="$(date -d "$TIME_CURRENT next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
- SECONDS_UNTIL_NEXT_DAY="$(( $(date +%s -d "$TIME_NEXT_DAY") - $(date +%s -d "$TIME_CURRENT") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
- if [[ "$SECONDS_UNTIL_NEXT_DAY" -gt 0 ]]; then
+ # Depends: date 8, echo 8, yell, try
+
+ local returnState timeCurrent timeNextDay secondsUntilNextDay
+
+ timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+ timeNextDay="$(date -d "$timeCurrent next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
+ secondsUntilNextDay="$(( $(date +%s -d "$timeNextDay") - $(date +%s -d "$timeCurrent") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
+ if [[ "$secondsUntilNextDay" -gt 0 ]]; then
returnState="true";
- elif [[ "$SECONDS_UNTIL_NEXT_DAY" -eq 0 ]]; then
- returnState="WARNING_ZERO";
+ elif [[ "$secondsUntilNextDay" -eq 0 ]]; then
+ returnState="warning_zero";
yell "WARNING:Reported time until next day exactly zero.";
- elif [[ "$SECONDS_UNTIL_NEXT_DAY" -lt 0 ]]; then
- returnState="WARNING_NEGATIVE";
+ elif [[ "$secondsUntilNextDay" -lt 0 ]]; then
+ returnState="warning_negative";
yell "WARNING:Reported time until next day is negative.";
fi
- try echo "$SECONDS_UNTIL_NEXT_DAY"; # Report
+ try echo "$secondsUntilNextDay"; # Report
- #===Determine function return code===
+ # Determine function return code
if [[ "$returnState" = "true" ]]; then
return 0;
- elif [[ "$returnState" = "WARNING_ZERO" ]]; then
+ elif [[ "$returnState" = "warning_zero" ]]; then
return 1;
- elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
+ elif [[ "$returnState" = "warning_negative" ]]; then
return 2;
fi
} # Report seconds until next day
if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement for myTTL:$myTTL"; exit 1; fi # Use of exit code to exit early if time <= 0.
#==END sample code==
+
+# Author: Steven Baltaktei Sandoval
+# License: GPLv3+