public JournalIndex <T> CreateIndex <T>(DateRange range = null, ICollection <string> requiredTags = null, ICollection <string> optionalTags = null)
where T : class, IJournalEntry
{
var index = new JournalIndex <T>();
foreach (var file in _markdownFiles.FindAll())
{
var reader = _readerWriterFactory.CreateReader(file);
if (range != null && !range.Includes(reader.EntryDate))
{
continue;
}
var entry = reader.ToJournalEntry <T>();
if (entry.Tags == null || entry.Tags.Count == 0)
{
continue;
}
if (requiredTags != null && requiredTags.Count > 0 && !entry.Tags.ContainsAll(requiredTags))
{
continue;
}
if (optionalTags != null && optionalTags.Count > 0 && !entry.Tags.ContainsAny(optionalTags))
{
continue;
}
foreach (var tag in entry.Tags)
{
if (index.Contains(tag))
{
index[tag].Entries.Add(entry);
}
else
{
var journalIndexEntry = new JournalIndexEntry <T>(tag, entry);
index.Add(journalIndexEntry);
}
}
}
return(index);
}
protected override string GetKeyForItem(JournalIndexEntry <T> item) => item.Tag;