added mail reminder script

reminder/cleaning_reminder.txt

@@ -0,0 +1,8 @@
+Hallo liebe Chaoten,
+
+am Samstag, den %(date)s haben wir wieder unseren Aufräumtag.
+
+Wir treffen uns wie immer um 11:00 Uhr. Das ist schon in %(diff)d Tagen... *g*
+
+das ctdo reminder script in volltestung
+

reminder/mail_reminder.sh

@@ -0,0 +1,3 @@
+#/bin/sh
+
+exec /home/hotte/mail_reminder/reminder.py -d 5 -r 1 -r 2 -r 3 -r 7 -r12 -m /home/hotte/mail_reminder/cleaning_reminder.txt -H mail2.ctdo.de

reminder/reminder.py

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+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import argparse
+import calendar
+import smtplib
+import sys
+
+from datetime import datetime
+from email.mime.text import MIMEText
+from email.header import Header
+from email import charset
+
+
+def createMail(args, target_date, diff):
+    fp = open(args.msg_template, 'r')
+    # Create a text/plain message
+    msg = MIMEText(fp.read() % {"date": target_date.strftime("%d.%m.%Y"), "diff":diff.days}, _charset="UTF-8")
+    fp.close()
+
+    msg['Subject'] = Header(args.subject, "utf-8")
+    msg['From'] =  args.From
+    msg['To'] = args.to
+    return msg
+
+
+def getNextCleaningDate(cal, args):
+    for week in reversed(cal):
+        if week[args.day] != 0:
+            return week[args.day]
+
+
+def main(args):
+    today = datetime.today()
+    cal = calendar.monthcalendar(today.year, today.month)
+
+    target_day = getNextCleaningDate(cal, args)
+    target_date = datetime(today.year, today.month, target_day)
+    diff = target_date - today
+
+    print("target_day", target_day)
+    print("target_date", target_date)
+    print("diff", diff)
+
+    if diff.days in args.reminder_days:
+        charset.add_charset('utf-8', charset.QP, charset.QP)
+        msg = createMail(args, target_date, diff)
+        print(type(msg.as_string()))
+        print("msg", msg.as_string())
+        
+        s = smtplib.SMTP(args.host)
+        s.set_debuglevel(3)
+        s.sendmail(args.From, [args.to], msg.as_string())
+        s.quit()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description="The ctdo configurable mail reminder script. " \
+        "Works on the last given day in month. Sends a mail with given " \
+        "'msg_template' if today is a day in the list of 'reminder_days'")
+
+    parser.add_argument('-d', "--day", type=int, choices=range(7), required=True, help="which last day in month? monday=0, tuesday=1, ...")
+    parser.add_argument('-r', "--reminder_days", type=int, action="append", choices=range(0, 31), required=True, help="on which day to remind the crowd? 1 will be one day before, 7 a week before. May be specified multiple times.")
+    parser.add_argument('-m', "--msg_template", required=True, help="The path to a a file with predefined email text to send. You can use %%(date)s and %%(diff) variables in the text.")
+    parser.add_argument('-s', "--subject", default="Das bissken Haushalt aka Aufräumtag im CTDO", help="mail subject")
+    parser.add_argument('-f', "--From", default="CTDOReminder <discuss@lists.chaostreff-dortmund.de>", help="mail from")
+    parser.add_argument('-t', "--to", default="discuss@lists.chaostreff-dortmund.de", help="mail to")
+    parser.add_argument('-H', "--host", default="", help="the smtp server to send to")
+
+    args = parser.parse_args(sys.argv[1:])
+
+    main(args)
+