#!/bin/bash
-# Date: 2020-02-13T23:14Z; baltakatei>
-
# Description: This script outputs days until the next time zone
# discontinuity using 'zdump' and 'date'.
SCRIPT_TZ="America/Los_Angeles" # Timezone to check for discontinuities
#=================================================
-echoerr() {
- echo "$@" 1>&2;
-}
+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 $*"; }
# Declare variables
declare -a datesDiscontArray #array
SCRIPT_YEAR=$(date +%Y)
SCRIPT_YEAR_NEXT=$(( $(date +%Y) + 1))
+SCRIPT_YEAR_NEXT2=$(( $(date +%Y) + 2))
SCRIPT_RUN_DATE_SECONDS=$(date +%s)
# Save zdump output for SCRIPT_YEAR (for how multiline data saved in variable, see https://stackoverflow.com/a/613580 )
-datesDiscont="$(zdump -c $SCRIPT_YEAR_NEXT -v $SCRIPT_TZ | grep $SCRIPT_YEAR | awk '{ print $2 " " $3 " " $4 " " $5 " " $6 " " $7 }'; echo)"
+datesDiscont="$(zdump -c "$SCRIPT_YEAR","$SCRIPT_YEAR_NEXT2" -v $SCRIPT_TZ | grep "$SCRIPT_YEAR\|$SCRIPT_YEAR_NEXT" | awk '{ print $2 " " $3 " " $4 " " $5 " " $6 " " $7 }'; echo)"
if [ -z "$datesDiscont" ]; then
- echo "No time discontinuity this year."
- exit 1
-fi
+ echo "No time discontinuity this year.";
+ exit 1;
+fi;
-###echoerr "datesDiscont:--""$datesDiscont""--"
+###yell "DEBUG:datesDiscont----------";
+###echo "$datesDiscont" 1>&2;
+###yell "DEBUG:-----------";
# Count lines in datesDiscont (for counting lines in a variable, see https://stackoverflow.com/a/6314682 )
#datesDiscontLineCount=$(echo "$datesDiscont" | wc -l)
datesDiscontArray+=($(date --date="$line" +%s))
#echo ${datesDiscontArray[-1]}
done <<< "$datesDiscont"
-#echoerr ${datesDiscontArray[@]}
+#yell ${datesDiscontArray[@]}
# Sort datesDiscontArray (see https://stackoverflow.com/a/11789688 )
IFS=$'\n' datesDiscontArray=($(sort <<<"${datesDiscontArray[*]}"))
unset IFS
+###yell "DEBUG:";
+###yell "DEBUG:datesDiscontArray:";
+###yell "${datesDiscontArray[@]}";
+###yell "DEBUG:";
+
# Get earliest date in datesDiscontArray that isn't in the past.
for discontinuityDate in "${datesDiscontArray[@]}"; do
- ###echoerr "Discontinuity date (seconds):"$discontinuityDate
- ###echoerr "SCRIPT_RUN_DATE_SECONDS :"$SCRIPT_RUN_DATE_SECONDS
+ ###yell "DEBUG:Discontinuity date (seconds):"$discontinuityDate
+ ###yell "DEBUG:SCRIPT_RUN_DATE_SECONDS :"$SCRIPT_RUN_DATE_SECONDS
if [ $discontinuityDate -gt $SCRIPT_RUN_DATE_SECONDS ]; then
- ###echoerr "DEBUG:Date in future."
+ ###yell "DEBUG:Date in future."
nextDiscontDate="$discontinuityDate"
break
fi
done
+# Check that nextDiscontDate is not empty
+if [ -z "$nextDiscontDate" ]; then
+ echo "ERROR:nextDiscontDate empty"
+fi;
+
+
+###yell "DEBUG:nextDiscontDate:$nextDiscontDate";
+###yell "DEBUG:SCRIPT_RUN_DATE_SECONDS:$SCRIPT_RUN_DATE_SECONDS";
+
echo $(( ( $nextDiscontDate - $SCRIPT_RUN_DATE_SECONDS )/86400 ))" days" # Days until next discontinuity date