From 3e3eff9ee639a60052a3fb4ae2e6955d2f85ae92 Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <valhalla@trueelena.org>
Date: Sat, 13 Jul 2019 18:23:51 +0200
Subject: Dates in the remote future could belong to a different release

---
 debdate | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/debdate b/debdate
index bd728b3..ed9542f 100755
--- a/debdate
+++ b/debdate
@@ -15,6 +15,7 @@ import argparse
 import csv
 import datetime
 from dateutil import relativedelta, parser
+import math
 import unittest
 
 RELEASES = [
@@ -35,6 +36,7 @@ RELEASES = [
     (datetime.date(1996, 6, 17), 'buzz'),
     ]
 MSG = "Today is day {dody} of year {yodr} of the {release}"
+FUTURE_MSG = "Today could be day {dody} of year {yodr} of the {release}"
 ERR_MSG = "Today is {isodate} of the Debianless Age"
 
 
@@ -71,6 +73,13 @@ class DebDate:
 
     def get_release(self, day):
         data = {}
+        today = datetime.date.today()
+        if day > today:
+            # This is just a fuzzy way to decide whether a date is
+            # likely to be after a future release.
+            data['certain'] = math.exp((today - day).days / 365.25 )
+        else:
+            data['certain'] = 1
         for r in self.releases:
             epoch = r[0]
             data['release'] = r[1]
@@ -112,6 +121,7 @@ class TestDebDate(unittest.TestCase):
             self.assertEqual(data['dody'], 10)
             self.assertEqual(data['yodr'], 1)
             self.assertEqual(data['release'], r[1])
+            self.assertEqual(data['certain'], 1)
 
     def testSecondYearRelease(self):
         for debdate in self.debdates:
@@ -121,6 +131,7 @@ class TestDebDate(unittest.TestCase):
             self.assertEqual(data['dody'], 227)
             self.assertEqual(data['yodr'], 2)
             self.assertEqual(data['release'], r[1])
+            self.assertEqual(data['certain'], 1)
 
     def testJanuarySecondYearRelease(self):
         for debdate in self.debdates:
@@ -130,6 +141,7 @@ class TestDebDate(unittest.TestCase):
             self.assertEqual(data['dody'], 1)
             self.assertEqual(data['yodr'], 2)
             self.assertEqual(data['release'], r[1])
+            self.assertEqual(data['certain'], 1)
 
     def testPastLatestRelease(self):
         for debdate in self.debdates:
@@ -140,6 +152,7 @@ class TestDebDate(unittest.TestCase):
             # release, so we do not check it
             self.assertEqual(data['yodr'], 6)
             self.assertEqual(data['release'], r[1])
+            self.assertLess(data['certain'], 1)
 
     def testBeforeBeginningOfTime(self):
         for debdate in self.debdates:
@@ -194,7 +207,11 @@ class Command:
         except OutsideTimeError:
             print(ERR_MSG.format(isodate=date.strftime("%Y-%m-%d")))
         else:
-            print(MSG.format(**data))
+            if data['certain'] > 0.14:
+                print(MSG.format(**data))
+            else:
+                print(FUTURE_MSG.format(**data))
+
 
     def main(self):
         self.setup_parser()
-- 
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