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+++ b/doc/jp/roster.rst	Tue Oct 01 22:49:06 2019 +0200
@@ -0,0 +1,110 @@
+================================
+roster: manager an entity roster
+================================
+
+"Roster" is the name used in XMPP for the contact list. In addition to list of contacts,
+you have also data like subscription information or groups associated to a contact.
+
+Groups are simple strings associated to one or more contacts (e.g. "friends" or "family").
+
+Subscription is the mechanism to get presence information of an entity. When you add a
+contact to your roster, most XMPP clients also do a presence subscription request, than
+the entity may accept or deny. If a presence subscription is accepted, the subscribed user
+can see when the other entity is online, and its presence status.
+
+get
+===
+
+Show the current roster. By default only a display name and JIDs are displayed, but you
+can increase verbosity to also display groups, or all other metadata.
+
+The short name shown next to jid is either the ``name`` specified in roster, or the node
+part of the jid. If none of them exist, only the entity JID is shown.
+
+The following metadata may be displayed:
+
+groups
+  group the entity belong too
+ask
+  true if a presence subscription request has been sent (but not answered yet)
+from
+  the contact has a subscription to user presence (i.e. your contact can see when you're
+  online and your presence status)
+to
+  the user has a subscription to the contact presence (i.e. you can see when you're
+  contact is online and his/her presence status)
+
+examples
+--------
+
+Get roster of default profile and display groups::
+
+  $ jp roster get -v
+
+Get roster of default profile and display all metadata::
+
+  $ jp roster get -vv
+
+Get roster or default profile and show the result in JSON::
+
+  $ jp roster get -O json
+
+stats
+=====
+
+Show some statistics about the profile roster. The number of contacts per server is shown,
+with a percentage of contacts on this server compared to the total number of contacts.
+This can notably be helpful to see if there is a concentration of your contacts in a
+specific server or gateway.
+
+Other more or less useful numbers are shown, they are self explaining.
+
+example
+-------
+
+Get statistic for the default profile::
+
+  $ jp roster stats
+
+purge
+=====
+
+This command is used to remove from the roster all contacts which have no subscription or
+only partial subscription.
+
+By default, only contacts without subscription at all are removed. With ``--no_from`` you
+also remove contacts which have no subscription to you (but you have a subscription to
+them), and with ``--no_to`` you also remove contacts that you are not subscribed to (but
+who are subscribed to you).
+
+example
+-------
+
+Remove all contacts from default profile which have no subscription at all or from which
+the default profile is not subscribed to::
+
+  $ jp roster purge --no_to
+
+resync
+======
+
+SàT uses `roster versioning`_ to optimize the synchronisation of roster with server on
+client connection. This means that once the roster has been retrieved, on each following
+connection, only the difference of contacts (i.e. which new or removed contacts) is
+received.
+
+This command does a full resynchronisation of the roster, or in other words it requests
+the whole roster and save it, replacing the list built with versioning. ``resync`` is
+mostly useful for developers and end-user should not need this command, as roster
+versioning is supposed to work fine and the roster should be synchronised correctly on
+startup. But if for any reason you suspect that your current roster list is corrupted, you
+may use it to be sure that a full resynchronisation is done.
+
+.. _roster versioning: https://tools.ietf.org/html/rfc6121#section-2.6
+
+exemple
+-------
+
+Do a full resynchronisation of default profile's roster::
+
+  $ jp roster resync