From 03d4851725f6ac5247a357dbe0f6eecf2558752b Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Thu, 18 Oct 2012 12:56:58 -0400
Subject: [PATCH] rss2email: add ability to load feeds from the config file
 only.

If a feed exists in the config file, but not in the data file, the
previous implementation would not load it.  This patch initializes
such feeds using only the information from the config file
(i.e. without dynamic data from the data file).  The patch also
creates missing data files on demand.  As an example use case, if you
keep a backup of your config file, but lose the data file, you can
restore the config file and an `r2e run` will create and repopulate
your data file.
---
 rss2email.py | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/rss2email.py b/rss2email.py
index 2ddabfc..86b16e4 100755
--- a/rss2email.py
+++ b/rss2email.py
@@ -1320,19 +1320,24 @@ class Feeds (list):
         while self:
             self.pop(0)
 
-    def load(self, lock=True):
+    def load(self, lock=True, require=False):
         LOG.debug('load feed configuration from {}'.format(self.configfiles))
         if self.configfiles:
             self.read_configfiles = self.config.read(self.configfiles)
         else:
             self.read_configfiles = []
         LOG.debug('loaded confguration from {}'.format(self.read_configfiles))
-        self._load_feeds(lock=lock)
+        self._load_feeds(lock=lock, require=require)
 
-    def _load_feeds(self, lock):
+    def _load_feeds(self, lock, require):
         LOG.debug('load feed data from {}'.format(self.datafile))
         if not _os.path.exists(self.datafile):
-            raise NoDataFile(feeds=self)
+            if require:
+                raise NoDataFile(feeds=self)
+            LOG.info('feed data file not found at {}'.format(self.datafile))
+            LOG.debug('creating an empty data file')
+            with open(self.datafile, 'wb') as f:
+                _pickle.dump([], f)
         try:
             self._datafile_lock = open(self.datafile, 'rb')
         except IOError as e:
@@ -1359,6 +1364,14 @@ class Feeds (list):
         for feed in self:
             feed.load_from_config(self.config)
 
+        for section in self.config.sections():
+            if section.startswith('feed.'):
+                name = section[len('feed.'):]
+                LOG.debug(
+                    ('feed {} not found feed file, initializing from config'
+                     ).format(name))
+                self.append(Feed(name=name, config=self.config))
+
     def save(self):
         LOG.debug('save feed configuration to {}'.format(self.configfiles[-1]))
         for feed in self:
-- 
2.26.2