chatstore.pl -- Store chat messages

When using redis, the messages for a document are stored in the key below as a sorted set where the score is the time in ms and the value is a Prolog dict holding the message.

Prefix:chat:docid:DocId

 chat_store(+Message:dict) is det

Add a chat message to the chat store. If Message.create == false, the message is only stored if the chat is already active. This is used to only insert messages about changes to the file if there is an ongoing chat so we know to which version chat messages refer.

 chat_messages(+DocID, -Messages:list, +Options) is det

Get messages associated with DocID. Options include

max(+Max)

Maximum number of messages to retrieve. Default is 25.

after(+TimeStamp)

Only get messages after TimeStamp

 swish_config:chat_count_about(+DocID, -Count)[multifile]

True when Count is the number of messages about DocID