matterhorn-50200.3.0: src/Types/Messages.hs
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TemplateHaskell #-}
{-|
The 'Message' is a single displayed event in a Channel. All Messages
have a date/time, and messages that represent posts to the channel
have a (hash) ID, and displayable text, along with other attributes.
All Messages are sorted chronologically. There is no assumption that
the server date/time is synchronized with the local date/time, so all
of the Message ordering uses the server's date/time.
The mattermost-api retrieves a 'Post' from the server, briefly encodes
the useful portions of that as a 'ClientPost' object and then converts
it to a 'Message' inserting this result it into the collection of
Messages associated with a Channel. The PostID of the message
uniquely identifies that message and can be used to interact with the
server for subsequent operations relative to that message's 'Post'.
The date/time associated with these messages is generated by the
server.
There are also "messages" generated directly by the Matterhorn client
which can be used to display additional, client-related information to
the user. Examples of these client messages are: date boundaries, the
"new messages" marker, errors from invoking the browser, etc. These
client-generated messages will have a date/time although it is locally
generated (usually by relation to an associated Post).
Most other Matterhorn operations primarily are concerned with
user-posted messages (@case mMessageId of Just _@ or @case mType of CP
_@), but others will include client-generated messages (@case mMessageId
of Nothing@ or @case mType of C _@).
--}
module Types.Messages
( -- * Message and operations on a single Message
Message(..)
, isDeletable, isReplyable, isEditable, isReplyTo, isGap, isFlaggable
, isEmote, isJoinLeave, isTransition
, mText, mUser, mDate, mType, mPending, mDeleted
, mAttachments, mInReplyToMsg, mMessageId, mReactions, mFlagged
, mOriginalPost, mChannelId, mMarkdownSource
, isBotMessage
, MessageType(..)
, MessageId(..)
, ThreadState(..)
, isPostMessage
, messagePostId
, messageIdPostId
, UserRef(..)
, ReplyState(..)
, clientMessageToMessage
, clientPostToMessage
, newMessageOfType
-- * Message Collections
, Messages
, ChronologicalMessages
, RetrogradeMessages
, MessageOps (..)
, noMessages
, filterMessages
, reverseMessages
, unreverseMessages
, splitMessages
, splitDirSeqOn
, chronologicalMsgsWithThreadStates
, retrogradeMsgsWithThreadStates
, findMessage
, getRelMessageId
, getNextMessage
, getPrevMessage
, getNextMessageId
, getPrevMessageId
, getNextPostId
, getPrevPostId
, getEarliestPostMsg
, getLatestPostMsg
, getEarliestSelectableMessage
, getLatestSelectableMessage
, findLatestUserMessage
-- * Operations on any Message type
, messagesAfter
, removeMatchesFromSubset
, withFirstMessage
, msgURLs
, altInlinesString
, LinkChoice(LinkChoice)
, linkUser
, linkURL
, linkTime
, linkName
, linkFileId
)
where
import Prelude ()
import Prelude.MH
import Cheapskate ( Blocks )
import qualified Cheapskate as C
import Control.Monad
import qualified Data.Foldable as F
import Data.Hashable ( Hashable )
import qualified Data.Map.Strict as Map
import Data.Sequence as Seq
import qualified Data.Set as S
import Data.Tuple
import Data.UUID ( UUID )
import GHC.Generics ( Generic )
import Lens.Micro.Platform ( makeLenses )
import Network.Mattermost.Types ( ChannelId, PostId, Post
, ServerTime, UserId, FileId )
import Types.DirectionalSeq
import Types.Posts
import Types.UserNames
-- | The state of a message's thread context.
data ThreadState =
NoThread
-- ^ The message is not in a thread at all.
| InThreadShowParent
-- ^ The message is in a thread, and the thread's root message
-- (parent) should be displayed above this message.
| InThread
-- ^ The message is in a thread but the thread's root message should
-- not be displayed above this message.
deriving (Show, Eq)
-- ----------------------------------------------------------------------
-- * Messages
data MessageId = MessagePostId PostId
| MessageUUID UUID
deriving (Eq, Read, Show, Generic, Hashable)
messageIdPostId :: MessageId -> Maybe PostId
messageIdPostId (MessagePostId p) = Just p
messageIdPostId _ = Nothing
-- | A 'Message' is any message we might want to render, either from
-- Mattermost itself or from a client-internal source.
data Message = Message
{ _mText :: Blocks
, _mMarkdownSource :: Text
, _mUser :: UserRef
, _mDate :: ServerTime
, _mType :: MessageType
, _mPending :: Bool
, _mDeleted :: Bool
, _mAttachments :: Seq Attachment
, _mInReplyToMsg :: ReplyState
, _mMessageId :: Maybe MessageId
, _mReactions :: Map.Map Text Int
, _mOriginalPost :: Maybe Post
, _mFlagged :: Bool
, _mChannelId :: Maybe ChannelId
} deriving (Show)
isPostMessage :: Message -> Bool
isPostMessage m =
isJust (_mMessageId m >>= messageIdPostId)
messagePostId :: Message -> Maybe PostId
messagePostId m = do
mId <- _mMessageId m
messageIdPostId mId
isDeletable :: Message -> Bool
isDeletable m =
isJust (messagePostId m) &&
case _mType m of
CP NormalPost -> True
CP Emote -> True
_ -> False
isFlaggable :: Message -> Bool
isFlaggable = isJust . messagePostId
isReplyable :: Message -> Bool
isReplyable m =
isJust (messagePostId m) &&
case _mType m of
CP NormalPost -> True
CP Emote -> True
_ -> False
isEditable :: Message -> Bool
isEditable m =
isJust (messagePostId m) &&
case _mType m of
CP NormalPost -> True
CP Emote -> True
_ -> False
isReplyTo :: PostId -> Message -> Bool
isReplyTo expectedParentId m =
case _mInReplyToMsg m of
NotAReply -> False
InReplyTo actualParentId -> actualParentId == expectedParentId
isGap :: Message -> Bool
isGap m = case _mType m of
C UnknownGapBefore -> True
C UnknownGapAfter -> True
_ -> False
isTransition :: Message -> Bool
isTransition m = case _mType m of
C DateTransition -> True
C NewMessagesTransition -> True
_ -> False
isEmote :: Message -> Bool
isEmote m = case _mType m of
CP Emote -> True
_ -> False
isJoinLeave :: Message -> Bool
isJoinLeave m = case _mType m of
CP Join -> True
CP Leave -> True
_ -> False
-- | A 'Message' is the representation we use for storage and
-- rendering, so it must be able to represent either a
-- post from Mattermost or an internal message. This represents
-- the union of both kinds of post types.
data MessageType = C ClientMessageType
| CP ClientPostType
deriving (Show)
-- | There may be no user (usually an internal message), a reference to
-- a user (by Id), or the server may have supplied a specific username
-- (often associated with bots). The boolean flag indicates whether the
-- user reference is for a message from a bot.
data UserRef = NoUser | UserI Bool UserId | UserOverride Bool Text
deriving (Eq, Show, Ord)
isBotMessage :: Message -> Bool
isBotMessage m =
case _mUser m of
UserI bot _ -> bot
UserOverride bot _ -> bot
NoUser -> False
-- | The 'ReplyState' of a message represents whether a message
-- is a reply, and if so, to what message
data ReplyState =
NotAReply
| InReplyTo PostId
deriving (Show, Eq)
-- | This type represents links to things in the 'open links' view.
data LinkChoice =
LinkChoice { _linkTime :: ServerTime
, _linkUser :: UserRef
, _linkName :: Text
, _linkURL :: Text
, _linkFileId :: Maybe FileId
} deriving (Eq, Show)
makeLenses ''LinkChoice
-- | Convert a 'ClientMessage' to a 'Message'. A 'ClientMessage' is
-- one that was generated by the Matterhorn client and which the
-- server knows nothing about. For example, an error message
-- associated with passing a link to the local browser.
clientMessageToMessage :: ClientMessage -> Message
clientMessageToMessage cm = Message
{ _mText = getBlocks (cm^.cmText)
, _mMarkdownSource = cm^.cmText
, _mUser = NoUser
, _mDate = cm^.cmDate
, _mType = C $ cm^.cmType
, _mPending = False
, _mDeleted = False
, _mAttachments = Seq.empty
, _mInReplyToMsg = NotAReply
, _mMessageId = Nothing
, _mReactions = Map.empty
, _mOriginalPost = Nothing
, _mFlagged = False
, _mChannelId = Nothing
}
-- | Builds a message from a ClientPost and also returns the set of
-- usernames mentioned in the text of the message.
clientPostToMessage :: ClientPost -> (Message, S.Set Text)
clientPostToMessage cp = (m, usernames)
where
usernames = findUsernames $ cp^.cpText
m = Message { _mText = cp^.cpText
, _mMarkdownSource = cp^.cpMarkdownSource
, _mUser =
case cp^.cpUserOverride of
Just n | cp^.cpType == NormalPost -> UserOverride (cp^.cpFromWebhook) n
_ -> maybe NoUser (UserI (cp^.cpFromWebhook)) $ cp^.cpUser
, _mDate = cp^.cpDate
, _mType = CP $ cp^.cpType
, _mPending = cp^.cpPending
, _mDeleted = cp^.cpDeleted
, _mAttachments = cp^.cpAttachments
, _mInReplyToMsg =
case cp^.cpInReplyToPost of
Nothing -> NotAReply
Just pId -> InReplyTo pId
, _mMessageId = Just $ MessagePostId $ cp^.cpPostId
, _mReactions = cp^.cpReactions
, _mOriginalPost = Just $ cp^.cpOriginalPost
, _mFlagged = False
, _mChannelId = Just $ cp^.cpChannelId
}
newMessageOfType :: Text -> MessageType -> ServerTime -> Message
newMessageOfType text typ d = Message
{ _mText = getBlocks text
, _mMarkdownSource = text
, _mUser = NoUser
, _mDate = d
, _mType = typ
, _mPending = False
, _mDeleted = False
, _mAttachments = Seq.empty
, _mInReplyToMsg = NotAReply
, _mMessageId = Nothing
, _mReactions = Map.empty
, _mOriginalPost = Nothing
, _mFlagged = False
, _mChannelId = Nothing
}
-- ** 'Message' Lenses
makeLenses ''Message
-- ----------------------------------------------------------------------
-- * Message Collections
-- | A wrapper for an ordered, unique list of 'Message' values.
--
-- This type has (and promises) the following instances: Show,
-- Functor, Monoid, Foldable, Traversable
type ChronologicalMessages = DirectionalSeq Chronological Message
type Messages = ChronologicalMessages
-- | There are also cases where the list of 'Message' values are kept
-- in reverse order (most recent -> oldest); these cases are
-- represented by the `RetrogradeMessages` type.
type RetrogradeMessages = DirectionalSeq Retrograde Message
-- ** Common operations on Messages
filterMessages ::
SeqDirection seq =>
(Message -> Bool) ->
DirectionalSeq seq Message ->
DirectionalSeq seq Message
filterMessages p = onDirectedSeq (Seq.filter p)
class MessageOps a where
-- | addMessage inserts a date in proper chronological order, with
-- the following extra functionality:
-- * no duplication (by PostId)
-- * no duplication (adjacent UnknownGap entries)
addMessage :: Message -> a -> a
instance MessageOps ChronologicalMessages where
addMessage m ml =
case viewr (dseq ml) of
EmptyR -> DSeq $ singleton m
_ :> l ->
case compare (m^.mDate) (l^.mDate) of
GT -> DSeq $ dseq ml |> m
EQ -> if m^.mMessageId == l^.mMessageId && isJust (m^.mMessageId)
then ml
else dirDateInsert m ml
LT -> dirDateInsert m ml
dirDateInsert :: Message -> ChronologicalMessages -> ChronologicalMessages
dirDateInsert m = onDirectedSeq $ finalize . foldr insAfter initial
where initial = (Just m, mempty)
insAfter c (Nothing, l) = (Nothing, c <| l)
insAfter c (Just n, l) =
case compare (n^.mDate) (c^.mDate) of
GT -> (Nothing, c <| (n <| l))
EQ -> if n^.mMessageId == c^.mMessageId && isJust (c^.mMessageId)
then (Nothing, c <| l)
else (Just n, c <| l)
LT -> (Just n, c <| l)
finalize (Just n, l) = n <| l
finalize (_, l) = l
noMessages :: Messages
noMessages = DSeq mempty
-- | Reverse the order of the messages
reverseMessages :: Messages -> RetrogradeMessages
reverseMessages = DSeq . Seq.reverse . dseq
-- | Unreverse the order of the messages
unreverseMessages :: RetrogradeMessages -> Messages
unreverseMessages = DSeq . Seq.reverse . dseq
splitDirSeqOn :: SeqDirection d
=> (a -> Bool)
-> DirectionalSeq d a
-> (Maybe a, (DirectionalSeq (ReverseDirection d) a,
DirectionalSeq d a))
splitDirSeqOn f msgs =
let (removed, remaining) = dirSeqBreakl f msgs
devomer = DSeq $ Seq.reverse $ dseq removed
in (withDirSeqHead id remaining, (devomer, onDirectedSeq (Seq.drop 1) remaining))
-- ----------------------------------------------------------------------
-- * Operations on Posted Messages
-- | Searches for the specified MessageId and returns a tuple where the
-- first element is the Message associated with the MessageId (if it
-- exists), and the second element is another tuple: the first element
-- of the second is all the messages from the beginning of the list to
-- the message just before the MessageId message (or all messages if not
-- found) *in reverse order*, and the second element of the second are
-- all the messages that follow the found message (none if the message
-- was never found) in *forward* order.
splitMessages :: Maybe MessageId
-> DirectionalSeq Chronological (Message, ThreadState)
-> (Maybe (Message, ThreadState),
( DirectionalSeq Retrograde (Message, ThreadState),
DirectionalSeq Chronological (Message, ThreadState)))
splitMessages mid msgs = splitDirSeqOn (\(m, _) -> isJust mid && m^.mMessageId == mid) msgs
-- | Given a message and its chronological predecessor, return
-- the thread state of the specified message with respect to its
-- predecessor.
threadStateFor :: Message
-- ^ The message whose state is to be obtained.
-> Message
-- ^ The message's predecessor.
-> ThreadState
threadStateFor msg prev = case msg^.mInReplyToMsg of
InReplyTo rootId ->
if | (prev^.mMessageId) == Just (MessagePostId rootId) ->
InThread
| prev^.mInReplyToMsg == msg^.mInReplyToMsg ->
InThread
| otherwise ->
InThreadShowParent
_ -> NoThread
retrogradeMsgsWithThreadStates :: RetrogradeMessages -> DirectionalSeq Retrograde (Message, ThreadState)
retrogradeMsgsWithThreadStates msgs = DSeq $ checkAdjacentMessages (dseq msgs)
where
getMessagePredecessor ms =
case Seq.viewl ms of
prev Seq.:< rest ->
if not $ isTransition prev
then Just prev
else getMessagePredecessor rest
Seq.EmptyL -> Nothing
checkAdjacentMessages s = case Seq.viewl s of
Seq.EmptyL -> mempty
m Seq.:< t ->
case getMessagePredecessor t of
Just prev ->
(m, threadStateFor m prev) Seq.<| checkAdjacentMessages t
Nothing -> case m^.mInReplyToMsg of
InReplyTo _ ->
Seq.singleton (m, InThreadShowParent)
_ ->
Seq.singleton (m, NoThread)
chronologicalMsgsWithThreadStates :: Messages -> DirectionalSeq Chronological (Message, ThreadState)
chronologicalMsgsWithThreadStates msgs = DSeq $ checkAdjacentMessages (dseq msgs)
where
getMessagePredecessor ms =
case Seq.viewr ms of
rest Seq.:> prev ->
if not $ isTransition prev
then Just prev
else getMessagePredecessor rest
Seq.EmptyR -> Nothing
checkAdjacentMessages s = case Seq.viewr s of
Seq.EmptyR -> mempty
t Seq.:> m ->
case getMessagePredecessor t of
Just prev ->
checkAdjacentMessages t Seq.|> (m, threadStateFor m prev)
Nothing -> case m^.mInReplyToMsg of
InReplyTo _ ->
Seq.singleton (m, InThreadShowParent)
_ ->
Seq.singleton (m, NoThread)
-- | findMessage searches for a specific message as identified by the
-- PostId. The search starts from the most recent messages because
-- that is the most likely place the message will occur.
findMessage :: MessageId -> Messages -> Maybe Message
findMessage mid msgs =
findIndexR (\m -> m^.mMessageId == Just mid) (dseq msgs)
>>= Just . Seq.index (dseq msgs)
-- | Look forward for the first Message with an ID that follows the
-- specified Id and return it. If no input Id supplied, get the
-- latest (most recent chronologically) Message in the input set.
getNextMessage :: Maybe MessageId -> Messages -> Maybe Message
getNextMessage = getRelMessageId
-- | Look backward for the first Message with an ID that follows the
-- specified MessageId and return it. If no input MessageId supplied,
-- get the latest (most recent chronologically) Message in the input
-- set.
getPrevMessage :: Maybe MessageId -> Messages -> Maybe Message
getPrevMessage mId = getRelMessageId mId . reverseMessages
-- | Look forward for the first Message with an ID that follows the
-- specified MessageId and return that found Message's ID; if no input
-- MessageId is specified, return the latest (most recent
-- chronologically) MessageId (if any) in the input set.
getNextMessageId :: Maybe MessageId -> Messages -> Maybe MessageId
getNextMessageId mId = _mMessageId <=< getNextMessage mId
-- | Look backwards for the first Message with an ID that comes before
-- the specified MessageId and return that found Message's ID; if no
-- input MessageId is specified, return the latest (most recent
-- chronologically) MessageId (if any) in the input set.
getPrevMessageId :: Maybe MessageId -> Messages -> Maybe MessageId
getPrevMessageId mId = _mMessageId <=< getPrevMessage mId
-- | Look forward for the first Message with an ID that follows the
-- specified PostId and return that found Message's PostID; if no
-- input PostId is specified, return the latest (most recent
-- chronologically) PostId (if any) in the input set.
getNextPostId :: Maybe PostId -> Messages -> Maybe PostId
getNextPostId pid = messagePostId <=< getNextMessage (MessagePostId <$> pid)
-- | Look backwards for the first Post with an ID that comes before
-- the specified PostId.
getPrevPostId :: Maybe PostId -> Messages -> Maybe PostId
getPrevPostId pid = messagePostId <=< getPrevMessage (MessagePostId <$> pid)
getRelMessageId :: SeqDirection dir =>
Maybe MessageId
-> DirectionalSeq dir Message
-> Maybe Message
getRelMessageId mId =
let isMId = const ((==) mId . _mMessageId) <$> mId
in getRelMessage isMId
-- | Internal worker function to return a different user message in
-- relation to either the latest point or a specific message.
getRelMessage :: SeqDirection dir =>
Maybe (Message -> Bool)
-> DirectionalSeq dir Message
-> Maybe Message
getRelMessage matcher msgs =
let after = case matcher of
Just matchFun -> case splitDirSeqOn matchFun msgs of
(_, (_, ms)) -> ms
Nothing -> msgs
in withDirSeqHead id $ filterMessages validSelectableMessage after
-- | Find the most recent message that is a Post (as opposed to a
-- local message) (if any).
getLatestPostMsg :: Messages -> Maybe Message
getLatestPostMsg msgs =
case viewr $ dropWhileR (not . validUserMessage) (dseq msgs) of
EmptyR -> Nothing
_ :> m -> Just m
-- | Find the oldest message that is a message with an ID.
getEarliestSelectableMessage :: Messages -> Maybe Message
getEarliestSelectableMessage msgs =
case viewl $ dropWhileL (not . validSelectableMessage) (dseq msgs) of
EmptyL -> Nothing
m :< _ -> Just m
-- | Find the most recent message that is a message with an ID.
getLatestSelectableMessage :: Messages -> Maybe Message
getLatestSelectableMessage msgs =
case viewr $ dropWhileR (not . validSelectableMessage) (dseq msgs) of
EmptyR -> Nothing
_ :> m -> Just m
-- | Find the earliest message that is a Post (as opposed to a
-- local message) (if any).
getEarliestPostMsg :: Messages -> Maybe Message
getEarliestPostMsg msgs =
case viewl $ dropWhileL (not . validUserMessage) (dseq msgs) of
EmptyL -> Nothing
m :< _ -> Just m
-- | Find the most recent message that is a message posted by a user
-- that matches the test (if any), skipping local client messages and
-- any user event that is not a message (i.e. find a normal message or
-- an emote).
findLatestUserMessage :: (Message -> Bool) -> Messages -> Maybe Message
findLatestUserMessage f ml =
case viewr $ dropWhileR (\m -> not (validUserMessage m && f m)) $ dseq ml of
EmptyR -> Nothing
_ :> m -> Just m
validUserMessage :: Message -> Bool
validUserMessage m =
not (m^.mDeleted) && case m^.mMessageId of
Just (MessagePostId _) -> True
_ -> False
validSelectableMessage :: Message -> Bool
validSelectableMessage m = (not $ m^.mDeleted) && (isJust $ m^.mMessageId)
-- ----------------------------------------------------------------------
-- * Operations on any Message type
-- | Return all messages that were posted after the specified date/time.
messagesAfter :: ServerTime -> Messages -> Messages
messagesAfter viewTime = onDirectedSeq $ takeWhileR (\m -> m^.mDate > viewTime)
-- | Removes any Messages (all types) for which the predicate is true
-- from the specified subset of messages (identified by a starting and
-- ending MessageId, inclusive) and returns the resulting list (from
-- start to finish, irrespective of 'firstId' and 'lastId') and the
-- list of removed items.
--
-- start | end | operates-on | (test) case
-- --------------------------------------------------------|-------------
-- Nothing | Nothing | entire list | C1
-- Nothing | Just found | start --> found] | C2
-- Nothing | Just missing | nothing [suggest invalid] | C3
-- Just found | Nothing | [found --> end | C4
-- Just found | Just found | [found --> found] | C5
-- Just found | Just missing | [found --> end | C6
-- Just missing | Nothing | nothing [suggest invalid] | C7
-- Just missing | Just found | start --> found] | C8
-- Just missing | Just missing | nothing [suggest invalid] | C9
--
-- @removeMatchesFromSubset matchPred fromId toId msgs = (remaining, removed)@
--
removeMatchesFromSubset :: (Message -> Bool) -> Maybe MessageId -> Maybe MessageId
-> Messages -> (Messages, Messages)
removeMatchesFromSubset matching firstId lastId msgs =
let knownIds = fmap (^.mMessageId) msgs
in if isNothing firstId && isNothing lastId
then swap $ dirSeqPartition matching msgs
else if isJust firstId && firstId `elem` knownIds
then onDirSeqSubset
(\m -> m^.mMessageId == firstId)
(if isJust lastId then \m -> m^.mMessageId == lastId else const False)
(swap . dirSeqPartition matching) msgs
else if isJust lastId && lastId `elem` knownIds
then onDirSeqSubset
(const True)
(\m -> m^.mMessageId == lastId)
(swap . dirSeqPartition matching) msgs
else (msgs, noMessages)
-- | Performs an operation on the first Message, returning just the
-- result of that operation, or Nothing if there were no messages.
-- Note that the message is not necessarily a posted user message.
withFirstMessage :: SeqDirection dir => (Message -> r) -> DirectionalSeq dir Message -> Maybe r
withFirstMessage = withDirSeqHead
msgURLs :: Message -> Seq LinkChoice
msgURLs msg
| NoUser <- msg^.mUser = mempty
| otherwise =
let uid = msg^.mUser
msgUrls = (\ (url, text) -> LinkChoice (msg^.mDate) uid text url Nothing) <$>
(mconcat $ blockGetURLs <$> (toList $ msg^.mText))
attachmentURLs = (\ a ->
LinkChoice
(msg^.mDate)
uid
("attachment `" <> (a^.attachmentName) <> "`")
(a^.attachmentURL)
(Just (a^.attachmentFileId)))
<$> (msg^.mAttachments)
in msgUrls <> attachmentURLs
blockGetURLs :: C.Block -> Seq.Seq (Text, Text)
blockGetURLs (C.Para is) = mconcat $ inlineGetURLs <$> toList is
blockGetURLs (C.Header _ is) = mconcat $ inlineGetURLs <$> toList is
blockGetURLs (C.Blockquote bs) = mconcat $ blockGetURLs <$> toList bs
blockGetURLs (C.List _ _ bss) = mconcat $ mconcat $ (blockGetURLs <$>) <$> (toList <$> bss)
blockGetURLs _ = mempty
inlineGetURLs :: C.Inline -> Seq.Seq (Text, Text)
inlineGetURLs (C.Emph is) = mconcat $ inlineGetURLs <$> toList is
inlineGetURLs (C.Strong is) = mconcat $ inlineGetURLs <$> toList is
inlineGetURLs (C.Link is url "") = (url, inlinesText is) Seq.<| (mconcat $ inlineGetURLs <$> toList is)
inlineGetURLs (C.Link is _ url) = (url, inlinesText is) Seq.<| (mconcat $ inlineGetURLs <$> toList is)
inlineGetURLs (C.Image is url _) = Seq.singleton (url, inlinesText is)
inlineGetURLs _ = mempty
inlinesText :: Seq C.Inline -> Text
inlinesText = F.fold . fmap go
where go (C.Str t) = t
go C.Space = " "
go C.SoftBreak = " "
go C.LineBreak = " "
go (C.Emph is) = F.fold (fmap go is)
go (C.Strong is) = F.fold (fmap go is)
go (C.Code t) = t
go (C.Link is _ _) = F.fold (fmap go is)
go (C.Image is _ _) = "[image" <> altInlinesString is <> "]"
go (C.Entity t) = t
go (C.RawHtml t) = t
altInlinesString :: Seq C.Inline -> Text
altInlinesString is | Seq.null is = ""
| otherwise = ":" <> inlinesText is