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-rw-r--r--desk/sur/tlon/channels.hoon464
-rw-r--r--desk/sur/tlon/cite.hoon57
-rw-r--r--desk/sur/tlon/groups.hoon383
3 files changed, 904 insertions, 0 deletions
diff --git a/desk/sur/tlon/channels.hoon b/desk/sur/tlon/channels.hoon
new file mode 100644
index 0000000..c222d4c
--- /dev/null
+++ b/desk/sur/tlon/channels.hoon
@@ -0,0 +1,464 @@
+:: channels: message stream structures
+::
+:: four shapes that cross client-subscriber-publisher boundaries:
+:: - actions client-to-subscriber change requests (user actions)
+:: - commands subscriber-to-publisher change requests
+:: - updates publisher-to-subscriber change notifications
+:: - responses subscriber-to-client change notifications
+::
+:: --action--> --command-->
+:: client subscriber publisher
+:: <--response-- <--update--
+::
+:: local actions _may_ become responses,
+:: remote actions become commands,
+:: commands _may_ become updates,
+:: updates _may_ become responses.
+::
+/- g=tlon-groups, c=tlon-cite
+/+ mp=mop-extensions
+|%
++| %ancients
+::
+++ mar
+ |%
+ ++ act `mark`%channel-action
+ ++ cmd `mark`%channel-command
+ ++ upd `mark`%channel-update
+ ++ log `mark`%channel-logs
+ ++ not `mark`%channel-posts
+ --
+::
++| %primitives
+::
++$ flag (pair ship term)
++$ v-channels (map nest v-channel)
+++ v-channel
+ |^ ,[global local]
+ :: $global: should be identical between ships
+ ::
+ +$ global
+ $: posts=v-posts
+ order=(rev order=arranged-posts)
+ view=(rev =view)
+ sort=(rev =sort)
+ perm=(rev =perm)
+ ==
+ :: $window: sparse set of time ranges
+ ::
+ ::TODO populate this
+ +$ window (list [from=time to=time])
+ :: .window: time range for requested posts that we haven't received
+ :: .diffs: diffs for posts in the window, to apply on receipt
+ ::
+ +$ future
+ [=window diffs=(jug id-post u-post)]
+ :: $local: local-only information
+ ::
+ +$ local
+ $: =net
+ =log
+ =remark
+ =window
+ =future
+ ==
+ --
+:: $v-post: a channel post
+::
++$ v-post [v-seal (rev essay)]
++$ id-post time
++$ v-posts ((mop id-post (unit v-post)) lte)
+++ on-v-posts ((on id-post (unit v-post)) lte)
+++ mo-v-posts ((mp id-post (unit v-post)) lte)
+:: $v-reply: a post comment
+::
++$ v-reply [v-reply-seal (rev memo)]
++$ id-reply time
++$ v-replies ((mop id-reply (unit v-reply)) lte)
+++ on-v-replies ((on id-reply (unit v-reply)) lte)
+++ mo-v-replies ((mp time (unit v-reply)) lte)
+:: $v-seal: host-side data for a post
+::
++$ v-seal $+ channel-seal
+ $: id=id-post
+ replies=v-replies
+ reacts=v-reacts
+ ==
+:: $v-reply-seal: host-side data for a reply
+::
++$ v-reply-seal
+ $: id=id-reply
+ reacts=v-reacts
+ ==
+:: $essay: top-level post, with metadata
+::
++$ essay [memo =kind-data]
+:: $reply-meta: metadata for all replies
++$ reply-meta
+ $: reply-count=@ud
+ last-repliers=(set ship)
+ last-reply=(unit time)
+ ==
+:: $kind-data: metadata for a channel type's "post"
+::
++$ kind-data
+ $% [%diary title=@t image=@t]
+ [%heap title=(unit @t)]
+ [%chat kind=$@(~ [%notice ~])]
+ ==
+:: $memo: post data proper
+::
+:: content: the body of the comment
+:: author: the ship that wrote the comment
+:: sent: the client-side time the comment was made
+::
++$ memo
+ $: content=story
+ author=ship
+ sent=time
+ ==
+:: $story: post body content
+::
++$ story (list verse)
+:: $verse: a chunk of post content
+::
+:: blocks stand on their own. inlines come in groups and get wrapped
+:: into a paragraph
+::
++$ verse
+ $% [%block p=block]
+ [%inline p=(list inline)]
+ ==
+:: $listing: recursive type for infinitely nested <ul> or <ol>
++$ listing
+ $% [%list p=?(%ordered %unordered %tasklist) q=(list listing) r=(list inline)]
+ [%item p=(list inline)]
+ ==
+:: $block: post content that sits outside of the normal text
+::
+:: %image: a visual, we record dimensions for better rendering
+:: %cite: an Urbit reference
+:: %header: a traditional HTML heading, h1-h6
+:: %listing: a traditional HTML list, ul and ol
+:: %code: a block of code
+::
++$ block $+ channel-block
+ $% [%image src=cord height=@ud width=@ud alt=cord]
+ [%cite =cite:c]
+ [%header p=?(%h1 %h2 %h3 %h4 %h5 %h6) q=(list inline)]
+ [%listing p=listing]
+ [%rule ~]
+ [%code code=cord lang=cord]
+ ==
+:: $inline: post content that flows within a paragraph
+::
+:: @t: plain text
+:: %italics: italic text
+:: %bold: bold text
+:: %strike: strikethrough text
+:: %inline-code: code formatting for small snippets
+:: %blockquote: blockquote surrounded content
+:: %block: link/reference to blocks
+:: %code: code formatting for large snippets
+:: %tag: tag gets special signifier
+:: %link: link to a URL with a face
+:: %break: line break
+::
++$ inline $+ channel-inline
+ $@ @t
+ $% [%italics p=(list inline)]
+ [%bold p=(list inline)]
+ [%strike p=(list inline)]
+ [%blockquote p=(list inline)]
+ [%inline-code p=cord]
+ [%code p=cord]
+ [%ship p=ship]
+ [%block p=@ud q=cord]
+ [%tag p=cord]
+ [%link p=cord q=cord]
+ [%task p=?(%.y %.n) q=(list inline)]
+ [%break ~]
+ ==
+::
++$ kind ?(%diary %heap %chat)
+:: $nest: identifier for a channel
++$ nest [=kind =ship name=term]
+:: $view: the persisted display format for a channel
++$ view $~(%list ?(%grid %list))
+:: $sort: the persisted sort type for a channel
++$ sort $~(%time ?(%alpha %time %arranged))
+:: $arranged-posts: an array of postIds
++$ arranged-posts (unit (list time))
+:: $hidden-posts: a set of ids for posts that are hidden
++$ hidden-posts (set id-post)
+:: $post-toggle: hide or show a particular post by id
++$ post-toggle
+ $% [%hide =id-post]
+ [%show =id-post]
+ ==
+:: $react: either an emoji identifier like :diff or a URL for custom
++$ react @ta
++$ v-reacts (map ship (rev (unit react)))
+:: $scan: search results
++$ scan (list reference)
++$ reference
+ $% [%post =post]
+ [%reply =id-post =reply]
+ ==
+:: $said: used for references
++$ said (pair nest reference)
+:: $plan: index into channel state
+:: p: Post being referred to
+:: q: Reply being referred to, if any
+::
++$ plan
+ (pair time (unit time))
+::
+:: $net: subscriber-only state
+::
++$ net [p=ship load=_|]
+::
+:: $unreads: a map of channel unread information, for clients
+:: $unread: unread data for a specific channel, for clients
+:: recency: time of most recent message
+:: count: how many posts are unread
+:: unread-id: the id of the first unread top-level post
+:: threads: for each unread thread, the id of the first unread reply
+::
++$ unreads (map nest unread)
++$ unread
+ $: recency=time
+ count=@ud
+ unread-id=(unit id-post)
+ threads=(map id-post id-reply)
+ ==
+:: $remark: markers representing unread state
+:: last-read: time at which the user last read this channel
+:: watching: unused, intended for disabling unread accumulation
+:: unread-threads: threads that contain unread messages
+::
++$ remark [recency=time last-read=time watching=_| unread-threads=(set id-post)]
+::
+:: $perm: represents the permissions for a channel and gives a
+:: pointer back to the group it belongs to.
+::
++$ perm
+ $: writers=(set sect:g)
+ group=flag:g
+ ==
+::
+:: $log: a time ordered history of modifications to a channel
+::
++$ log ((mop time u-channel) lte)
+++ log-on ((on time u-channel) lte)
+::
+:: $create-channel: represents a request to create a channel
+::
+:: $create-channel is consumed by the channel agent first and then
+:: passed to the groups agent to register the channel with the group.
+::
+:: Write permission is stored with the specific agent in the channel,
+:: read permission is stored with the group's data.
+::
++$ create-channel
+ $: =kind
+ name=term
+ group=flag:g
+ title=cord
+ description=cord
+ readers=(set sect:g)
+ writers=(set sect:g)
+ ==
+:: $outline: abridged $post
+:: .replies: number of comments
+::
++$ outline
+ [replies=@ud replyers=(set ship) essay]
+::
+++ outlines
+ =< outlines
+ |%
+ +$ outlines ((mop time outline) lte)
+ ++ on ((^on time outline) lte)
+ --
+++ rev
+ |$ [data]
+ [rev=@ud data]
+::
+++ apply-rev
+ |* [old=(rev) new=(rev)]
+ ^+ [changed=& old]
+ ?: (lth rev.old rev.new)
+ &+new
+ |+old
+::
+++ next-rev
+ |* [old=(rev) new=*]
+ ^+ [changed=& old]
+ ?: =(+.old new)
+ |+old
+ &+old(rev +(rev.old), + new)
+::
++| %actions
+::
+:: some actions happen to be the same as commands, but this can freely
+:: change
+::
+::NOTE we might want to add a action-id=uuid to this eventually, threading
+:: that through all the way, so that an $r-channels may indicate what
+:: originally caused it
++$ a-channels
+ $% [%create =create-channel]
+ [%pin pins=(list nest)]
+ [%channel =nest =a-channel]
+ [%toggle-post toggle=post-toggle]
+ ==
++$ a-channel
+ $% [%join group=flag:g]
+ [%leave ~]
+ a-remark
+ c-channel
+ ==
+::
++$ a-remark
+ $~ [%read ~]
+ $% [%read ~]
+ [%read-at =time]
+ [%watch ~]
+ [%unwatch ~]
+ ==
+::
++$ a-post c-post
++$ a-reply c-reply
+::
++| %commands
+::
++$ c-channels
+ $% [%create =create-channel]
+ [%channel =nest =c-channel]
+ ==
++$ c-channel
+ $% [%post =c-post]
+ [%view =view]
+ [%sort =sort]
+ [%order order=arranged-posts]
+ [%add-writers sects=(set sect:g)]
+ [%del-writers sects=(set sect:g)]
+ ==
+::
++$ c-post
+ $% [%add =essay]
+ [%edit id=id-post =essay]
+ [%del id=id-post]
+ [%reply id=id-post =c-reply]
+ c-react
+ ==
+::
++$ c-reply
+ $% [%add =memo]
+ [%edit id=id-reply =memo]
+ [%del id=id-reply]
+ c-react
+ ==
+::
++$ c-react
+ $% [%add-react id=@da p=ship q=react]
+ [%del-react id=@da p=ship]
+ ==
+::
++| %updates
+::
++$ update [=time =u-channel]
++$ u-channels [=nest =u-channel]
++$ u-channel
+ $% [%create =perm]
+ [%order (rev order=arranged-posts)]
+ [%view (rev =view)]
+ [%sort (rev =sort)]
+ [%perm (rev =perm)]
+ [%post id=id-post =u-post]
+ ==
+::
++$ u-post
+ $% [%set post=(unit v-post)]
+ [%reacts reacts=v-reacts]
+ [%essay (rev =essay)]
+ [%reply id=id-reply =u-reply]
+ ==
+::
++$ u-reply
+ $% [%set reply=(unit v-reply)]
+ [%reacts reacts=v-reacts]
+ ==
+::
++$ u-checkpoint global:v-channel
+::
++| %responses
+::
++$ r-channels [=nest =r-channel]
++$ r-channel
+ $% [%posts =posts]
+ [%post id=id-post =r-post]
+ [%order order=arranged-posts]
+ [%view =view]
+ [%sort =sort]
+ [%perm =perm]
+ ::
+ [%create =perm]
+ [%join group=flag:g]
+ [%leave ~]
+ a-remark
+ ==
+::
++$ r-post
+ $% [%set post=(unit post)]
+ [%reply id=id-reply =reply-meta =r-reply]
+ [%reacts =reacts]
+ [%essay =essay]
+ ==
+::
++$ r-reply
+ $% [%set reply=(unit reply)]
+ [%reacts =reacts]
+ ==
+:: versions of backend types with their revision numbers stripped,
+:: because the frontend shouldn't care to learn those.
+::
++$ channels (map nest channel)
+++ channel
+ |^ ,[global local]
+ +$ global
+ $: =posts
+ order=arranged-posts
+ =view
+ =sort
+ =perm
+ ==
+ ::
+ +$ local
+ $: =net
+ =remark
+ ==
+ --
++$ paged-posts
+ $: =posts
+ newer=(unit time)
+ older=(unit time)
+ total=@ud
+ ==
++$ posts ((mop id-post (unit post)) lte)
++$ post [seal essay]
++$ seal
+ $: id=id-post
+ =reacts
+ =replies
+ =reply-meta
+ ==
++$ reacts (map ship react)
++$ reply [reply-seal memo]
++$ replies ((mop id-reply reply) lte)
++$ reply-seal [id=id-reply parent-id=id-post =reacts]
+++ on-posts ((on id-post (unit post)) lte)
+++ on-replies ((on id-reply reply) lte)
++$ cite cite:c
+--
diff --git a/desk/sur/tlon/cite.hoon b/desk/sur/tlon/cite.hoon
new file mode 100644
index 0000000..1d92a46
--- /dev/null
+++ b/desk/sur/tlon/cite.hoon
@@ -0,0 +1,57 @@
+/- g=tlon-groups
+=< cite
+|%
+++ purse
+ |= =(pole knot)
+ ^- (unit cite)
+ ?. =(~.1 -.pole) ~
+ =. pole +.pole
+ ?+ pole ~
+ [%chan agent=@ ship=@ name=@ rest=*]
+ =/ ship (slaw %p ship.pole)
+ ?~ ship ~
+ `[%chan [agent.pole u.ship name.pole] rest.pole]
+ ::
+ [%desk ship=@ name=@ rest=*]
+ =/ ship (slaw %p ship.pole)
+ ?~ ship ~
+ `[%desk [u.ship name.pole] rest.pole]
+ ::
+ [%group ship=@ name=@ ~]
+ =/ ship (slaw %p ship.pole)
+ ?~ ship ~
+ `[%group u.ship name.pole]
+ ==
+::
+++ parse
+ |= =path
+ ^- cite
+ (need (purse path))
+::
+++ print
+ |= c=cite
+ |^ ^- path
+ :- (scot %ud 1)
+ ?- -.c
+ %chan chan/(welp (nest nest.c) wer.c)
+ %desk desk/(welp (flag flag.c) wer.c)
+ %group group/(flag flag.c)
+ %bait bait/:(welp (flag grp.c) (flag gra.c) wer.c)
+ ==
+ ++ flag
+ |= f=flag:g
+ ~[(scot %p p.f) q.f]
+ ++ nest
+ |= n=nest:g
+ [p.n (flag q.n)]
+ --
+::
++$ cite
+ $% [%chan =nest:g wer=path]
+ [%group =flag:g]
+ [%desk =flag:g wer=path]
+ [%bait grp=flag:g gra=flag:g wer=path]
+ :: scry into groups when you receive a bait for a chat that doesn't exist yet
+ :: work out what app
+ ==
+--
diff --git a/desk/sur/tlon/groups.hoon b/desk/sur/tlon/groups.hoon
new file mode 100644
index 0000000..cf03233
--- /dev/null
+++ b/desk/sur/tlon/groups.hoon
@@ -0,0 +1,383 @@
+|%
+++ epic
+|%
++$ saga
+ $~ [%lev ~]
+ $% [%dex ver=@ud]
+ [%lev ~]
+ [%chi ~]
+ ==
+
++$ epic @ud
+--
+++ meta
+|%
++$ data
+ $: title=cord
+ description=cord
+ image=cord
+ cover=cord
+ ==
++$ diff
+ $% [%title =cord]
+ [%description =cord]
+ [%image =cord]
+ [%cover =cord]
+ ==
+--
+++ e epic
+++ okay `epic:e`2
+++ mar
+ |%
+ ++ act `mark`(rap 3 %group-action '-' (scot %ud okay) ~)
+ ++ upd `mark`(rap 3 %group-update '-' (scot %ud okay) ~)
+ ++ log `mark`(rap 3 %group-log '-' (scot %ud okay) ~)
+ ++ int `mark`(rap 3 %group-init '-' (scot %ud okay) ~)
+ --
+:: $flag: ID for a group
+::
++$ flag (pair ship term)
+::
+:: $nest: ID for a channel, {app}/{ship}/{name}
+::
++$ nest (pair term flag)
+::
+:: $sect: ID for cabal, similar to a role
+::
++$ sect term
+::
+:: $zone: channel grouping
+::
+:: includes its own metadata for display and keeps the order of
+:: channels within.
+::
+:: zone: the term that represents the ID of a zone
+:: realm: the metadata representing the zone and the order of channels
+:: delta: the set of actions that can be taken on a zone
+:: %add: create a zone
+:: %del: delete the zone
+:: %edit: modify the zone metadata
+:: %mov: reorders the zone in the group
+:: %mov-nest: reorders a channel within the zone
+::
+++ zone
+ =< zone
+ |%
+ +$ zone @tas
+ +$ realm
+ $: met=data:meta
+ ord=(list nest)
+ ==
+ +$ diff (pair zone delta)
+ +$ delta
+ $% [%add meta=data:meta]
+ [%del ~]
+ [%edit meta=data:meta]
+ [%mov idx=@ud]
+ [%mov-nest =nest idx=@ud]
+ ==
+ --
+::
+:: $fleet: group members and their associated metadata
+::
+:: vessel: a user's set of sects or roles and the time that they joined
+:: @da default represents an admin added member that has yet to join
+::
+++ fleet
+ =< fleet
+ |%
+ +$ fleet (map ship vessel)
+ +$ vessel
+ $: sects=(set sect)
+ joined=time
+ ==
+ +$ diff
+ $% [%add ~]
+ [%del ~]
+ [%add-sects sects=(set sect)]
+ [%del-sects sects=(set sect)]
+ ==
+ --
+::
+:: $channel: a medium for interaction
+::
+++ channel
+ =< channel
+ |%
+ +$ preview
+ $: =nest
+ meta=data:meta
+ group=^preview
+ ==
+ ::
+ +$ channels (map nest channel)
+ ::
+ :: $channel: a collection of metadata about a specific agent integration
+ ::
+ :: meta: title, description, image, cover
+ :: added: when the channel was created
+ :: zone: what zone or section to bucket in
+ :: join: should the channel be joined by new members
+ :: readers: what sects can see the channel, empty means anyone
+ ::
+ +$ channel
+ $: meta=data:meta
+ added=time
+ =zone
+ join=?
+ readers=(set sect)
+ ==
+ ::
+ :: $diff: represents the set of actions you can take on a channel
+ ::
+ :: add: create a channel
+ :: edit: edit a channel
+ :: del: delete a channel
+ :: add-sects: add sects to readers
+ :: del-sects: delete sects from readers
+ :: zone: change the zone of the channel
+ :: join: toggle default join
+ ::
+ +$ diff
+ $% [%add =channel]
+ [%edit =channel]
+ [%del ~]
+ ::
+ [%add-sects sects=(set sect)]
+ [%del-sects sects=(set sect)]
+ ::
+ [%zone =zone]
+ ::
+ [%join join=_|]
+ ==
+ --
+::
+:: $group: collection of people and the pathways in which they interact
+::
+:: group holds all data around members, permissions, channel
+:: organization, and its own metadata to represent the group
+::
++$ group
+ $: =fleet
+ cabals=(map sect cabal)
+ zones=(map zone realm:zone)
+ zone-ord=(list zone)
+ =bloc
+ =channels:channel
+ imported=(set nest)
+ =cordon
+ secret=?
+ meta=data:meta
+ ==
+::
++$ group-ui [group saga=(unit saga:e)]
+:: $cabal: metadata representing a $sect or role
+::
+++ cabal
+ =< cabal
+ |%
+ ::
+ +$ cabal
+ [meta=data:meta ~]
+ ::
+ +$ diff
+ $% [%add meta=data:meta]
+ [%edit meta=data:meta]
+ [%del ~]
+ ==
+ --
+::
+:: $cordon: group entry and visibility permissions
+::
+++ cordon
+ =< cordon
+ |%
+ ::
+ :: $open: a group with open entry, only bans are barred entry
+ ::
+ ++ open
+ |%
+ :: $ban: set of ships and ranks/classes that are not allowed entry
+ ::
+ :: bans can either be done at the individual ship level or by the
+ :: rank level (comet/moon/etc.)
+ ::
+ +$ ban [ships=(set ship) ranks=(set rank:title)]
+ +$ diff
+ $% [%add-ships p=(set ship)]
+ [%del-ships p=(set ship)]
+ ::
+ [%add-ranks p=(set rank:title)]
+ [%del-ranks p=(set rank:title)]
+ ==
+ --
+ ::
+ :: $shut: a group with closed entry, everyone barred entry
+ ::
+ :: a shut cordon means that the group is closed, but still visible.
+ :: people may request entry and either be accepted or denied or
+ :: they may be invited directly
+ ::
+ :: ask: represents those requesting entry
+ :: pending: represents those who've been invited
+ ::
+ ++ shut
+ |%
+ +$ state [pend=(set ship) ask=(set ship)]
+ +$ kind ?(%ask %pending)
+ +$ diff
+ $% [%add-ships p=kind q=(set ship)]
+ [%del-ships p=kind q=(set ship)]
+ ==
+ --
+ ::
+ :: $cordon: a set of metadata to represent the entry policy for a group
+ ::
+ :: open: a group with open entry, only bans barred entry
+ :: shut: a group with closed entry, everyone barred entry
+ :: afar: a custom entry policy defined by another agent
+ ::
+ +$ cordon
+ $% [%shut state:shut]
+ [%afar =flag =path desc=@t]
+ [%open =ban:open]
+ ==
+ ::
+ :: $diff: the actions you can take on a cordon
+ ::
+ +$ diff
+ $% [%shut p=diff:shut]
+ [%open p=diff:open]
+ [%swap p=cordon]
+ ==
+ --
+::
+:: $bloc: superuser sects
+::
+:: sects in the bloc set are allowed to make modifications to the group
+:: and its various metadata and permissions
+::
+++ bloc
+ =< bloc
+ |%
+ +$ bloc (set sect)
+ +$ diff
+ $% [%add p=(set sect)]
+ [%del p=(set sect)]
+ ==
+ --
+::
+:: $diff: the general set of changes that can be made to a group
+::
++$ diff
+ $% [%fleet p=(set ship) q=diff:fleet]
+ [%cabal p=sect q=diff:cabal]
+ [%channel p=nest q=diff:channel]
+ [%bloc p=diff:bloc]
+ [%cordon p=diff:cordon]
+ [%zone p=diff:zone]
+ [%meta p=data:meta]
+ [%secret p=?]
+ [%create p=group]
+ [%del ~]
+ ==
+::
+:: $action: the complete set of data required to edit a group
+::
++$ action
+ (pair flag update)
+::
+:: $update: a representation in time of a modification of a group
+::
++$ update
+ (pair time diff)
+::
+:: $create: a request to make a group
+::
++$ create
+ $: name=term
+ title=cord
+ description=cord
+ image=cord
+ cover=cord
+ =cordon
+ members=(jug ship sect)
+ secret=?
+ ==
+::
++$ init [=time =group]
+::
+:: $groups-ui: map for frontend to display groups
++$ groups-ui
+ (map flag group-ui)
++$ groups
+ (map flag group)
++$ net-groups
+ (map flag [net group])
+::
+:: $log: a time ordered map of all modifications to groups
+::
++$ log
+ ((mop time diff) lte)
+::
+++ log-on
+ ((on time diff) lte)
+::
+:: $net: an indicator of whether I'm a host or subscriber
+::
++$ net
+ $~ [%pub ~]
+ $% [%pub p=log]
+ [%sub p=time load=_| =saga:e]
+ ==
+::
+:: $join: a join request, can elect to join all channels
+::
++$ join
+ $: =flag
+ join-all=?
+ ==
+::
+:: $knock: a request to enter a closed group
+::
++$ knock flag
+::
+:: $progress: the state of a group join
+::
++$ progress
+ ?(%knocking %adding %watching %done %error)
+::
+:: $claim: a mark for gangs to represent a join in progress
+::
++$ claim
+ $: join-all=?
+ =progress
+ ==
+::
+:: $preview: the metadata and entry policy for a group
+::
++$ preview
+ $: =flag
+ meta=data:meta
+ =cordon
+ =time
+ secret=?
+ ==
+::
++$ previews (map flag preview)
+::
+:: $invite: a marker to show you've been invited to a group
+::
++$ invite (pair flag ship)
+::
+:: $gang: view of foreign group
+::
++$ gang
+ $: cam=(unit claim)
+ pev=(unit preview)
+ vit=(unit invite)
+ ==
+::
++$ gangs (map flag gang)
+::
+--