Ipynb reader & writer: properly handle cell "id".

This is passed through if it exists (in Nb4); otherwise
the writer will add a random one so that cells all have
an "id".

Closes #7728.

8 files changed, 85 insertions, 42 deletions

diff --git a/cabal.project b/cabal.project
index 669dd74e2..1c49a003c 100644
--- a/cabal.project
+++ b/cabal.project
@@ -7,3 +7,8 @@ constraints: aeson >= 2.0.1.0
 --   type: git
 --   location: https://github.com/jgm/texmath.git
 --   tag: 674bcbaec03e5550f155623de6662953bd157625
+
+source-repository-package
+  type: git
+  location: https://github.com/jgm/ipynb.git
+  tag: 62f1a5180a61bc89c06982d8b869b1f254208699
diff --git a/pandoc.cabal b/pandoc.cabal
index 0e064957b..74f67c403 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -475,7 +475,7 @@ library
                  http-client           >= 0.4.30   && < 0.8,
                  http-client-tls       >= 0.2.4    && < 0.4,
                  http-types            >= 0.8      && < 0.13,
-                 ipynb                 >= 0.1.0.2  && < 0.2,
+                 ipynb                 >= 0.2      && < 0.3,
                  jira-wiki-markup      >= 1.4      && < 1.5,
                  lpeg                  >= 1.0.1    && < 1.1,
                  mtl                   >= 2.2      && < 2.3,
diff --git a/src/Text/Pandoc/Readers/Ipynb.hs b/src/Text/Pandoc/Readers/Ipynb.hs
index e6de29b44..8e742a888 100644
--- a/src/Text/Pandoc/Readers/Ipynb.hs
+++ b/src/Text/Pandoc/Readers/Ipynb.hs
@@ -77,7 +77,10 @@ cellToBlocks opts lang c = do
   let Source ts = cellSource c
   let source = mconcat ts
   let kvs = jsonMetaToPairs (cellMetadata c)
-  let attachments = maybe mempty M.toList $ cellAttachments c
+  let attachments = case cellAttachments c of
+                      Nothing -> mempty
+                      Just (MimeAttachments m) -> M.toList m
+  let ident = fromMaybe mempty $ cellId c
   mapM_ addAttachment attachments
   case cellType c of
     Ipynb.Markdown -> do
@@ -86,12 +89,12 @@ cellToBlocks opts lang c = do
                else do
                  Pandoc _ bs <- walk fixImage <$> readMarkdown opts source
                  return bs
-      return $ B.divWith ("",["cell","markdown"],kvs)
+      return $ B.divWith (ident,["cell","markdown"],kvs)
              $ B.fromList bs
     Ipynb.Heading lev -> do
       Pandoc _ bs <- readMarkdown opts
         (T.replicate lev "#" <> " " <> source)
-      return $ B.divWith ("",["cell","markdown"],kvs)
+      return $ B.divWith (ident,["cell","markdown"],kvs)
              $ B.fromList bs
     Ipynb.Raw -> do
       -- we use ipynb to indicate no format given (a wildcard in nbformat)
@@ -108,11 +111,12 @@ cellToBlocks opts lang c = do
               "text/restructuredtext" -> "rst"
               "text/asciidoc"         -> "asciidoc"
               _                       -> format
-      return $ B.divWith ("",["cell","raw"],kvs) $ B.rawBlock format' source
+      return $ B.divWith (ident,["cell","raw"],kvs)
+             $ B.rawBlock format' source
     Ipynb.Code{ codeOutputs = outputs, codeExecutionCount = ec } -> do
       outputBlocks <- mconcat <$> mapM outputToBlock outputs
       let kvs' = maybe kvs (\x -> ("execution_count", tshow x):kvs) ec
-      return $ B.divWith ("",["cell","code"],kvs') $
+      return $ B.divWith (ident,["cell","code"],kvs') $
         B.codeBlockWith ("",[lang],[]) source
         <> outputBlocks
 
@@ -161,7 +165,7 @@ outputToBlock Err{ errName = ename,
 -- the output format.
 handleData :: PandocMonad m
            => JSONMeta -> MimeBundle -> m B.Blocks
-handleData metadata (MimeBundle mb) =
+handleData (JSONMeta metadata) (MimeBundle mb) =
   mconcat <$> mapM dataBlock (M.toList mb)
 
   where
@@ -209,7 +213,7 @@ handleData metadata (MimeBundle mb) =
     dataBlock _ = return mempty
 
 jsonMetaToMeta :: JSONMeta -> M.Map Text MetaValue
-jsonMetaToMeta = M.map valueToMetaValue
+jsonMetaToMeta (JSONMeta m) = M.map valueToMetaValue m
   where
     valueToMetaValue :: Value -> MetaValue
     valueToMetaValue x@Object{} =
@@ -228,11 +232,11 @@ jsonMetaToMeta = M.map valueToMetaValue
     valueToMetaValue Aeson.Null = MetaString ""
 
 jsonMetaToPairs :: JSONMeta -> [(Text, Text)]
-jsonMetaToPairs = M.toList . M.map
+jsonMetaToPairs (JSONMeta m) = M.toList . M.map
   (\case
       String t
         | not (T.all isDigit t)
         , t /= "true"
         , t /= "false"
                  -> t
-      x          -> T.pack $ UTF8.toStringLazy $ Aeson.encode x)
+      x          -> T.pack $ UTF8.toStringLazy $ Aeson.encode x) $ m
diff --git a/src/Text/Pandoc/Writers/Ipynb.hs b/src/Text/Pandoc/Writers/Ipynb.hs
index 30ef100ad..b81771bb2 100644
--- a/src/Text/Pandoc/Writers/Ipynb.hs
+++ b/src/Text/Pandoc/Writers/Ipynb.hs
@@ -37,6 +37,8 @@ import qualified Data.ByteString.Lazy as BL
 import Data.Aeson.Encode.Pretty (Config(..), defConfig,
            encodePretty', keyOrder, Indent(Spaces))
 import Text.DocLayout (literal)
+import Text.Pandoc.UUID (getRandomUUID)
+import Data.Char (isAscii, isAlphaNum)
 
 writeIpynb :: PandocMonad m => WriterOptions -> Pandoc -> m Text
 writeIpynb opts d = do
@@ -79,7 +81,7 @@ pandocToNotebook opts (Pandoc meta blocks) = do
   let metadata = case fromJSON metadata' of
                    Error _ -> mempty -- TODO warning here? shouldn't happen
                    Success x -> x
-  cells <- extractCells opts blocks
+  cells <- extractCells nbformat opts blocks
   return $ Notebook{
        notebookMetadata = metadata
      , notebookFormat = nbformat
@@ -97,23 +99,26 @@ addAttachment (Image attr lab (src,tit))
   return $ Image attr lab ("attachment:" <> src, tit)
 addAttachment x = return x
 
-extractCells :: PandocMonad m => WriterOptions -> [Block] -> m [Ipynb.Cell a]
-extractCells _ [] = return []
-extractCells opts (Div (_id,classes,kvs) xs : bs)
+extractCells :: PandocMonad m
+             => (Int, Int) -> WriterOptions -> [Block] -> m [Ipynb.Cell a]
+extractCells _ _ [] = return []
+extractCells nbformat opts (Div (ident,classes,kvs) xs : bs)
   | "cell" `elem` classes
   , "markdown" `elem` classes = do
       let meta = pairsToJSONMeta kvs
       (newdoc, attachments) <-
         runStateT (walkM addAttachment (Pandoc nullMeta xs)) mempty
       source <- writeMarkdown opts{ writerTemplate = Nothing } newdoc
+      uuid <- uuidFrom nbformat ident
       (Ipynb.Cell{
           cellType = Markdown
+        , cellId = uuid
         , cellSource = Source $ breakLines $ T.stripEnd source
         , cellMetadata = meta
         , cellAttachments = if M.null attachments
                                then Nothing
-                               else Just attachments } :)
-            <$> extractCells opts bs
+                               else Just $ MimeAttachments attachments } :)
+            <$> extractCells nbformat opts bs
   | "cell" `elem` classes
   , "code" `elem` classes = do
       let (codeContent, rest) =
@@ -123,14 +128,16 @@ extractCells opts (Div (_id,classes,kvs) xs : bs)
       let meta = pairsToJSONMeta kvs
       outputs <- catMaybes <$> mapM blockToOutput rest
       let exeCount = lookup "execution_count" kvs >>= safeRead
+      uuid <- uuidFrom nbformat ident
       (Ipynb.Cell{
           cellType = Ipynb.Code {
                 codeExecutionCount = exeCount
               , codeOutputs = outputs
               }
+        , cellId = uuid
         , cellSource = Source $ breakLines codeContent
         , cellMetadata = meta
-        , cellAttachments = Nothing } :) <$> extractCells opts bs
+        , cellAttachments = Nothing } :) <$> extractCells nbformat opts bs
   | "cell" `elem` classes
   , "raw" `elem` classes =
       case consolidateAdjacentRawBlocks xs of
@@ -150,33 +157,54 @@ extractCells opts (Div (_id,classes,kvs) xs : bs)
                   "rst"      -> "text/restructuredtext"
                   "asciidoc" -> "text/asciidoc"
                   _          -> f
+          uuid <- uuidFrom nbformat ident
           (Ipynb.Cell{
               cellType = Raw
+            , cellId = uuid
             , cellSource = Source $ breakLines raw
             , cellMetadata = if format' == "ipynb" -- means no format given
                                 then mempty
-                                else M.insert "raw_mimetype"
+                                else JSONMeta $ M.insert "raw_mimetype"
                                        (Aeson.String format') mempty
-            , cellAttachments = Nothing } :) <$> extractCells opts bs
-        _ -> extractCells opts bs
-extractCells opts (CodeBlock (_id,classes,kvs) raw : bs)
+            , cellAttachments = Nothing } :) <$> extractCells nbformat opts bs
+        _ -> extractCells nbformat opts bs
+extractCells nbformat opts (CodeBlock (ident,classes,kvs) raw : bs)
   | "code" `elem` classes = do
       let meta = pairsToJSONMeta kvs
       let exeCount = lookup "execution_count" kvs >>= safeRead
+      uuid <- uuidFrom nbformat ident
       (Ipynb.Cell{
           cellType = Ipynb.Code {
                 codeExecutionCount = exeCount
               , codeOutputs = []
               }
+        , cellId = uuid
         , cellSource = Source $ breakLines raw
         , cellMetadata = meta
-        , cellAttachments = Nothing } :) <$> extractCells opts bs
-extractCells opts (b:bs) = do
+        , cellAttachments = Nothing } :) <$> extractCells nbformat opts bs
+extractCells nbformat opts (b:bs) = do
       let isCodeOrDiv (CodeBlock (_,cl,_) _) = "code" `elem` cl
           isCodeOrDiv (Div (_,cl,_) _)       = "cell" `elem` cl
           isCodeOrDiv _                      = False
       let (mds, rest) = break isCodeOrDiv bs
-      extractCells opts (Div ("",["cell","markdown"],[]) (b:mds) : rest)
+      extractCells nbformat opts
+        (Div ("",["cell","markdown"],[]) (b:mds) : rest)
+
+-- Return Nothing if nbformat < 4.5.
+-- Otherwise construct a UUID, using the existing identifier
+-- if it is a valid UUID, otherwise constructing a new one.
+uuidFrom :: PandocMonad m => (Int, Int) -> Text -> m (Maybe Text)
+uuidFrom nbformat ident =
+  if nbformat >= (4,5)
+     then
+       if isValidUUID ident
+          then return $ Just ident
+          else Just . T.pack . drop 9 . show <$> getRandomUUID
+     else return Nothing
+ where
+  isValidUUID t = not (T.null t) && T.length t <= 64 &&
+                  T.all isValidUUIDChar t
+  isValidUUIDChar c = isAscii c && (isAlphaNum c || c == '-' || c == '_')
 
 blockToOutput :: PandocMonad m => Block -> m (Maybe (Output a))
 blockToOutput (Div (_,["output","stream",sname],_) (CodeBlock _ t:_)) =
@@ -229,7 +257,7 @@ extractData bs = do
     go (mmap, meta) b = (mmap, meta) <$ report (BlockNotRendered b)
 
 pairsToJSONMeta :: [(Text, Text)] -> JSONMeta
-pairsToJSONMeta kvs =
+pairsToJSONMeta kvs = JSONMeta $
   M.fromList [(k, case Aeson.decode (UTF8.fromTextLazy $ TL.fromStrict v) of
                            Just val -> val
                            Nothing  -> String v)
diff --git a/stack.yaml b/stack.yaml
index bdaa0b3d1..5f6a34068 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -32,10 +32,11 @@ extra-deps:
 - commonmark-extensions-0.2.2
 - citeproc-0.6
 - aeson-pretty-0.8.9
-- ipynb-0.1.0.2
 - texmath-0.12.3.3
 - unicode-transforms-0.4.0
 - unicode-data-0.2.0
+- git: https://github.com/jgm/ipynb.git
+  commit: 62f1a5180a61bc89c06982d8b869b1f254208699
 ghc-options:
    "$locals": -fhide-source-paths -Wno-missing-home-modules
 resolver: lts-18.10
diff --git a/test/ipynb/simple.in.native b/test/ipynb/simple.in.native
index cc707877f..8f3d36019 100644
--- a/test/ipynb/simple.in.native
+++ b/test/ipynb/simple.in.native
@@ -1,15 +1,15 @@
 Pandoc (Meta {unMeta = fromList [("jupyter",MetaMap (fromList [("nbformat",MetaInlines [Str "4"]),("nbformat_minor",MetaInlines [Str "5"])]))]})
-[Div ("",["cell","markdown"],[])
+[Div ("uid1",["cell","markdown"],[])
  [Header 1 ("lorem-ipsum",[],[]) [Str "Lorem",Space,Str "ipsum"]
  ,Para [Strong [Str "Lorem",Space,Str "ipsum"],Space,Str "dolor",Space,Str "sit",Space,Str "amet,",Space,Str "consectetur",Space,Str "adipiscing",Space,Str "elit.",Space,Str "Nunc",Space,Str "luctus",SoftBreak,Str "bibendum",Space,Str "felis",Space,Str "dictum",Space,Str "sodales."]]
-,Div ("",["cell","code"],[])
+,Div ("uid2",["cell","code"],[])
  [CodeBlock ("",["python"],[]) "print(\"hello\")"]
-,Div ("",["cell","markdown"],[])
+,Div ("uid3",["cell","markdown"],[])
  [Header 2 ("pyout",[],[]) [Str "Pyout"]]
-,Div ("",["cell","code"],[("execution_count","2")])
+,Div ("uid4",["cell","code"],[("execution_count","2")])
  [CodeBlock ("",["python"],[]) "from IPython.display import HTML\nHTML(\"\"\"\n<script>\nconsole.log(\"hello\");\n</script>\n<b>HTML</b>\n\"\"\")"
- ,Div ("",["output","execute_result"],[("execution_count","2")])
+ ,Div ("uid5",["output","execute_result"],[("execution_count","2")])
   [RawBlock (Format "html") "<script>\nconsole.log(\"hello\");\n</script>\n<b>HTML</b>\nhello"]]
-,Div ("",["cell","markdown"],[("tags","[\"foo\",\"bar\"]")])
+,Div ("uid6",["cell","markdown"],[("tags","[\"foo\",\"bar\"]")])
  [Header 2 ("image",[],[]) [Str "Image"]
  ,Para [Str "This",Space,Str "image",Space,Image ("",[],[]) [Str "the",Space,Str "moon"] ("lalune.jpg",""),Space,Str "will",Space,Str "be",Space,Str "included",Space,Str "as",Space,Str "a",Space,Str "cell",SoftBreak,Str "attachment."]]]
diff --git a/test/ipynb/simple.ipynb b/test/ipynb/simple.ipynb
index 26901db57..c2dbe0640 100644
--- a/test/ipynb/simple.ipynb
+++ b/test/ipynb/simple.ipynb
@@ -9,7 +9,8 @@
     "\n",
     "**Lorem ipsum** dolor sit amet, consectetur adipiscing elit. Nunc luctus\n",
     "bibendum felis dictum sodales."
-   ]
+   ],
+   "id": "uid1"
   },
   {
    "cell_type": "code",
@@ -18,7 +19,8 @@
    "outputs": [],
    "source": [
     "print(\"hello\")"
-   ]
+   ],
+   "id": "uid2"
   },
   {
    "cell_type": "markdown",
@@ -26,7 +28,8 @@
    "source": [
     "Pyout\n",
     "-----"
-   ]
+   ],
+   "id": "uid3"
   },
   {
    "cell_type": "code",
@@ -56,7 +59,8 @@
     "</script>\n",
     "<b>HTML</b>\n",
     "\"\"\")"
-   ]
+   ],
+   "id": "uid4"
   },
   {
    "cell_type": "markdown",
@@ -77,7 +81,8 @@
     "lalune.jpg": {
      "image/jpeg": 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Vkecer9en1+9FzeLCCq4URjgDP7mtLhteadBY2kMczyHUpcO0YxtiUjgH/q9c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\nsSjCcDmgVAAbgYoGYJ3nk9qBUAYHAoP/2Q==\n"
     }
-   }
+   },
+   "id": "uid6"
   }
  ],
  "nbformat": 4,
diff --git a/test/ipynb/simple.out.native b/test/ipynb/simple.out.native
index 0f243ca48..a17c36a41 100644
--- a/test/ipynb/simple.out.native
+++ b/test/ipynb/simple.out.native
@@ -12,7 +12,7 @@ Pandoc
           ]
     }
   [ Div
-      ( "" , [ "cell" , "markdown" ] , [] )
+      ( "uid1" , [ "cell" , "markdown" ] , [] )
       [ Header
           1
           ( "lorem-ipsum" , [] , [] )
@@ -46,13 +46,13 @@ Pandoc
           ]
       ]
   , Div
-      ( "" , [ "cell" , "code" ] , [] )
+      ( "uid2" , [ "cell" , "code" ] , [] )
       [ CodeBlock ( "" , [ "python" ] , [] ) "print(\"hello\")" ]
   , Div
-      ( "" , [ "cell" , "markdown" ] , [] )
+      ( "uid3" , [ "cell" , "markdown" ] , [] )
       [ Header 2 ( "pyout" , [] , [] ) [ Str "Pyout" ] ]
   , Div
-      ( ""
+      ( "uid4"
       , [ "cell" , "code" ]
       , [ ( "execution_count" , "2" ) ]
       )
@@ -70,7 +70,7 @@ Pandoc
           ]
       ]
   , Div
-      ( ""
+      ( "uid6"
       , [ "cell" , "markdown" ]
       , [ ( "tags" , "[\"foo\",\"bar\"]" ) ]
       )