Init commit.

.gitignore

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+*.vcf
+*.ics

README.md

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+# vCard to iCalendar Birthday export
+
+Export birthdays from contacts to a iCalendar.
+
+## Usage
+
+`./export.py < contacts.vcf > birthdays.ics`

export.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import re
+import sys
+import datetime
+import vobject
+
+card = vobject.vCard()
+cal = vobject.iCalendar()
+
+R_FMT = (
+    (re.compile('^[0-9]{8}$'), '%Y%m%d'),
+    (re.compile('^--[0-9]{4}$'), '--%m%d'),
+    (re.compile('^[0-9]{4}-[0-9]{2}-[0-9]{2}$'), '%Y-%m-%d')
+)
+
+def vobj_str2date(content_line):
+    v = content_line.value
+    for r, f in R_FMT:
+        if r.match(v):
+            return datetime.datetime.strptime(v, f)
+    raise ValueError(f'cannot parse specified string {v}')
+
+
+for o in vobject.readComponents(sys.stdin):
+    if 'bday' not in o.contents:
+        continue
+    #print(o.fn, o.bday, type(o.bday), o.bday.value)
+    name = o.fn.value
+    date = vobj_str2date(o.bday)
+    if date.year <= 1900:
+        date = date.replace(year=datetime.datetime.now().year)
+    date_end = date + datetime.timedelta(days=1)
+    cal.add('vevent')
+    cal.vevent_list[-1].add('summary').value = o.fn.value
+    cal.vevent_list[-1].add('dtstart').value = date.date()
+    cal.vevent_list[-1].add('dtend').value = date_end.date()
+    cal.vevent_list[-1].add('rrule').value = 'FREQ=YEARLY'
+print(cal.serialize())
+