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#!/bin/sh -x
# tested under FreeBSD 13
for requirement in "curl" "awk" "uuidgen"; do
which $requirement 2>/dev/null || (echo $requirement not found. please install it. && exit)
done
test -d $1 || (echo The first parameter has to be the name of a directory with vcf-files in it. && exit)
NOW=`date +%Y%m%dT%H%M%SZ`
test -z "$NOW" && (echo could not determine the current date, the date command is incompatible. && exit)
for filename in $1/*.vcf; do
eval `awk -F':' 'BEGIN{RS="\r\n"} /FN:/{fn=$2} /BDAY:/{bday=$2} END{printf "export FN=\"%s\" BDAY=\"%s\"\n", fn, bday}' $filename`
if ! test -z "$BDAY" && ! test -z "$FN" ; then
AGE=$(expr `date +%Y` - `date -juf '%Y-%m-%d' $BDAY +%Y` || echo 0)
DAY=`date -juf '%Y-%m-%d' $BDAY +%Y%m%dT000000Z`
UUID=`uuidgen`
if ! test -z "$AGE" && test "$AGE" -gt 0 && ! test -z "$DAY" && ! test -z "$UUID" ; then
printf '%02d %s %s\n' "$AGE" "$BDAY" "$FN"
cat <<-EOF > BD-$UUID.ics
BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
CREATED:$NOW
UID:$UUID
SUMMARY:$FN $AGE birthday
DTSTART;VALUE=DATE:$DAY
RRULE:FREQ=YEARLY
DESCRIPTION:$DESCRIPTION
END:VEVENT
END:VCALENDAR
EOF
fi
fi
done
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