From f047edbc55a9d8cce7931c0cddc255bb676bd83d Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <valhalla@trueelena.org>
Date: Fri, 26 May 2017 18:17:52 +0200
Subject: Read release data from /usr/share/distro-info/debian.csv

---
 debdate | 84 +++++++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 59 insertions(+), 25 deletions(-)

diff --git a/debdate b/debdate
index bd5cb44..39af2ea 100755
--- a/debdate
+++ b/debdate
@@ -7,7 +7,12 @@
 # License, Version 2, as published by Sam Hocevar. See
 # http://www.wtfpl.net/ for more details.
 
+# Debian release dates can be found in the package distro-info-data,
+# but an hardcoded fallback is included to run this script where such
+# package is not available.
+
 import argparse
+import csv
 import datetime
 from dateutil import relativedelta, parser
 import unittest
@@ -32,9 +37,31 @@ MSG = "Today is day {dody} of year {yodr} of the {release}"
 
 
 class DebDate:
+    def __init__(self, distro_info_file='/usr/share/distro-info/debian.csv'):
+        self.releases = []
+        try:
+            with open(distro_info_file) as fp:
+                releases = csv.reader(fp, delimiter=',')
+                for row in releases:
+                    if len(row) > 4:
+                        try:
+                            date = datetime.datetime.strptime(
+                                row[4],
+                                '%Y-%m-%d'
+                                )
+                        except ValueError:
+                            pass
+                        else:
+                            self.releases.append((date.date(), row[1]))
+        except FileNotFoundError:
+            releases = []
+        self.releases.sort(key=lambda x: x[0], reverse=True)
+        if not self.releases:
+            self.releases = RELEASES
+
     def get_release(self, day):
         data = {}
-        for r in RELEASES:
+        for r in self.releases:
             epoch = r[0]
             data['release'] = r[1]
             if day > epoch:
@@ -62,38 +89,45 @@ class OutsideTimeError(ValueError):
 
 class TestDebDate(unittest.TestCase):
     def setUp(self):
-        self.debdate = DebDate()
+        self.debdates = [
+            DebDate(),
+            DebDate(distro_info_file='/no/such/file'),
+            ]
 
     def testFirstYearRelease(self):
-        r = RELEASES[-1]
-        d = r[0] + relativedelta.relativedelta(days=10)
-        data = self.debdate.get_release(d)
-        self.assertEqual(data['dody'], 10)
-        self.assertEqual(data['yodr'], 1)
-        self.assertEqual(data['release'], r[1])
+        for debdate in self.debdates:
+            r = debdate.releases[-1]
+            d = r[0] + relativedelta.relativedelta(days=10)
+            data = debdate.get_release(d)
+            self.assertEqual(data['dody'], 10)
+            self.assertEqual(data['yodr'], 1)
+            self.assertEqual(data['release'], r[1])
 
     def testSecondYearRelease(self):
-        r = RELEASES[-6]
-        d = r[0] + relativedelta.relativedelta(years=1)
-        data = self.debdate.get_release(d)
-        self.assertEqual(data['dody'], 227)
-        self.assertEqual(data['yodr'], 2)
-        self.assertEqual(data['release'], r[1])
+        for debdate in self.debdates:
+            r = debdate.releases[-6]
+            d = r[0] + relativedelta.relativedelta(years=1)
+            data = debdate.get_release(d)
+            self.assertEqual(data['dody'], 227)
+            self.assertEqual(data['yodr'], 2)
+            self.assertEqual(data['release'], r[1])
 
     def testPastLatestRelease(self):
-        r = RELEASES[0]
-        d = r[0] + relativedelta.relativedelta(years=5)
-        data = self.debdate.get_release(d)
-        # Day Of The Year will change depending on when is the latest
-        # release, so we do not check it
-        self.assertEqual(data['yodr'], 6)
-        self.assertEqual(data['release'], r[1])
+        for debdate in self.debdates:
+            r = debdate.releases[0]
+            d = r[0] + relativedelta.relativedelta(years=5)
+            data = debdate.get_release(d)
+            # Day Of The Year will change depending on when is the latest
+            # release, so we do not check it
+            self.assertEqual(data['yodr'], 6)
+            self.assertEqual(data['release'], r[1])
 
     def testBeforeBeginningOfTime(self):
-        r = RELEASES[-1]
-        d = r[0] + relativedelta.relativedelta(days=-1)
-        with self.assertRaises(OutsideTimeError):
-            self.debdate.get_release(d)
+        for debdate in self.debdates:
+            r = debdate.releases[-1]
+            d = r[0] + relativedelta.relativedelta(days=-1)
+            with self.assertRaises(OutsideTimeError):
+                debdate.get_release(d)
 
 
 class Command:
-- 
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