From c62a80a6dd9936226dab4ed205c60f12489d8c65 Mon Sep 17 00:00:00 2001
From: Max Christian Pohle
Date: Mon, 6 Sep 2021 18:08:17 +0200
Subject: First working version

tested under FreeBSD 13
---
 bday.sh | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 bday.sh

diff --git a/bday.sh b/bday.sh
new file mode 100644
index 0000000..da4daf8
--- /dev/null
+++ b/bday.sh
@@ -0,0 +1,42 @@
+#!/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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