Add support for folder base journal.

Adds feature for issue #170 (and #398) where you configure your journal to
be a directory and entries are added as sub-directories and files:
yyyy/mm/dd.txt. Multiple entries in a day will go in the same file, but a
new entry for a specific day will create a new file (and directory
structure).

Fix failed test scenarios for folder journal.

jrnl/FolderJournal.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+from __future__ import absolute_import, unicode_literals
+from . import Entry
+from . import Journal
+import codecs
+import os
+import fnmatch
+
+def get_files(journal_config):
+    """Searches through sub directories starting with journal_config and find all text files"""
+    filenames = []
+    for root, dirnames, f in os.walk(journal_config):
+        for filename in fnmatch.filter(f, '*.txt'):
+            filenames.append(os.path.join(root, filename))
+    return filenames
+
+
+class Folder(Journal.Journal):
+    """A Journal handling multiple files in a folder"""
+
+    def __init__(self, **kwargs):
+        self.entries = []
+        self._diff_entry_dates = []
+        super(Folder, self).__init__(**kwargs)
+
+        
+    def open(self):
+        filenames = []
+        self.entries = []
+        filenames = get_files(self.config['journal'])
+        for filename in filenames:
+            with codecs.open(filename, "r", "utf-8") as f:
+                journal = f.read()
+                self.entries.extend(self._parse(journal))
+        self.sort()
+        return self
+
+    def write(self):
+        """Writes only the entries that have been modified into proper files."""
+        #Create a list of dates of modified entries. Start with diff_entry_dates
+        modified_dates = self._diff_entry_dates
+        seen_dates = set(self._diff_entry_dates)
+        for e in self.entries:
+            if e.modified:
+                if e.date not in seen_dates:
+                    modified_dates.append(e.date)
+                    seen_dates.add(e.date)
+
+        #For every date that had a modified entry, write to a file
+        for d in modified_dates:
+            write_entries=[]
+            filename = os.path.join(self.config['journal'], d.strftime("%Y"), d.strftime("%m"), d.strftime("%d")+".txt")
+            dirname = os.path.dirname(filename)
+            #create directory if it doesn't exist
+            if not os.path.exists(dirname):
+                os.makedirs(dirname)
+            for e in self.entries:
+                if e.date.year == d.year and e.date.month == d.month and e.date.day == d.day:
+                    write_entries.append(e)
+            journal = "\n".join([e.__unicode__() for e in write_entries])
+            with codecs.open(filename, 'w', "utf-8") as journal_file:
+                journal_file.write(journal)
+        #look for and delete empty files
+        filenames = []
+        filenames = get_files(self.config['journal'])
+        for filename in filenames:
+            if os.stat(filename).st_size <= 0:
+                #print("empty file: {}".format(filename))
+                os.remove(filename)
+
+    def parse_editable_str(self, edited):
+        """Parses the output of self.editable_str and updates it's entries."""
+        mod_entries = self._parse(edited)
+        diff_entries = set(self.entries) - set(mod_entries)
+        for e in diff_entries:
+            self._diff_entry_dates.append(e.date)
+        # Match those entries that can be found in self.entries and set
+        # these to modified, so we can get a count of how many entries got
+        # modified and how many got deleted later.
+        for entry in mod_entries:
+            entry.modified = not any(entry == old_entry for old_entry in self.entries)
+        self.entries = mod_entries

jrnl/Journal.py

@@ -378,12 +378,9 @@ def open_journal(name, config, legacy=False):
 
             return DayOneJournal.DayOne(**config).open()
         else:
-            print(
-                f"[Error: {config['journal']} is a directory, but doesn't seem to be a DayOne journal either.",
-                file=sys.stderr,
-            )
+            from . import FolderJournal
 
-            sys.exit(1)
+            return FolderJournal.Folder(**config).open()
 
     if not config["encrypt"]:
         if legacy: