Fixed #3760. (#3784)

Using the same solution as in the LaTeX reader:
equation -> displaymath
align -> displaymath \begin{aligned} ... \end{aligned}
etc..

src/Text/Pandoc/Readers/Vimwiki.hs

@@ -75,7 +75,8 @@ import qualified Text.Pandoc.Builder
   as B (headerWith, str, space, strong, emph, strikeout, code, link, image,
         spanWith, para, horizontalRule, blockQuote, bulletList, plain,
         orderedList, simpleTable, softbreak, codeBlockWith, imageWith, divWith,
-        setMeta, definitionList, superscript, subscript)
+        setMeta, definitionList, superscript, subscript, displayMath, 
+        math)
 import Text.Pandoc.Class (PandocMonad(..))
 import Text.Pandoc.Definition (Pandoc(..), Inline(Space),
   Block(BulletList, OrderedList), Attr, nullMeta, Meta, ListNumberStyle(..),
@@ -265,13 +266,32 @@ displayMath :: PandocMonad m => VwParser m Blocks
 displayMath = try $ do
   many spaceChar >> string "{{$"
   mathTag <- option "" mathTagParser
+  many space
   contents <- manyTill anyChar (try (char '\n' >> many spaceChar >> string "}}$"
     >> many spaceChar >> newline))
   let contentsWithTags
-        | mathTag == "" = "\\[" ++ contents ++ "\n\\]"
-        | otherwise     = "\\begin{" ++ mathTag ++ "}" ++ contents
+        | mathTag == "" = contents
+        | otherwise     = "\\begin{" ++ mathTag ++ "}\n" ++ contents
                           ++ "\n\\end{" ++ mathTag ++ "}"
-  return $ B.plain $ B.str contentsWithTags
+  return $ B.para $ B.displayMath contentsWithTags
+
+
+mathTagLaTeX :: String -> String
+mathTagLaTeX s = case s of
+   "equation" -> ""
+   "equation*" -> ""
+   "gather" -> "gathered"
+   "gather*" -> "gathered"
+   "multline" -> "gathered"
+   "multline*" -> "gathered"
+   "eqnarray" -> "aligned"
+   "eqnarray*" -> "aligned"
+   "align" -> "aligned"
+   "align*" -> "aligned"
+   "alignat" -> "aligned"
+   "alignat*" -> "aligned"
+   _ -> s
+
 
 mixedList :: PandocMonad m => VwParser m Blocks
 mixedList = try $ do
@@ -598,7 +618,7 @@ inlineMath :: PandocMonad m => VwParser m Inlines
 inlineMath = try $ do
   char '$'
   contents <- many1Till (noneOf "\n") (char '$')
-  return $ B.str $ "\\(" ++ contents ++ "\\)"
+  return $ B.math contents
 
 tag :: PandocMonad m => VwParser m Inlines
 tag = try $ do
@@ -650,4 +670,4 @@ mathTagParser = do
   s <- try $ lookAhead (char '%' >> (manyTill (noneOf spaceChars)
     (try $ char '%' >> many (noneOf $ '%':spaceChars) >> space)))
   char '%' >> string s >> char '%'
-  return s
+  return $ mathTagLaTeX s

test/vimwiki-reader.native

@@ -81,7 +81,7 @@ Pandoc (Meta {unMeta = fromList [("date",MetaInlines [Str "2017-05-01"]),("title
 ,Header 2 ("lists",[],[]) [Str "lists"]
 ,OrderedList (1,DefaultStyle,DefaultDelim)
  [[Plain [Str "ordered",Space,Str "list",Space,Str "item",Space,Str "1,",Space,Str "and",Space,Str "here",Space,Str "is",Space,Str "some",Space,Str "math",Space,Str "belonging",Space,Str "to",Space,Str "list",Space,Str "item",Space,Str "1"]
-  ,Plain [Str "\\[\n a^2 + b^2 = c^2\n\\]"]
+  ,Para [Math DisplayMath "a^2 + b^2 = c^2"]
   ,Plain [Str "and",Space,Str "some",Space,Str "preformatted",Space,Str "and",Space,Str "tables",Space,Str "belonging",Space,Str "to",Space,Str "item",Space,Str "1",Space,Str "as",Space,Str "well"]
   ,CodeBlock ("",[],[]) "I'm part of item 1."
   ,Table [] [AlignDefault,AlignDefault] [0.0,0.0]
@@ -184,9 +184,13 @@ Pandoc (Meta {unMeta = fromList [("date",MetaInlines [Str "2017-05-01"]),("title
       ,[Plain [Str "b"]]]]]]]
  ,[Plain [Span ("",["done4"],[]) [],Str "task",Space,Str "2"]]]
 ,Header 2 ("math",[],[]) [Str "math"]
-,Para [Str "\\( \\sum_i a_i^2 = 1 \\)"]
-,Plain [Str "\\[\n\\sum_i a_i^2\n=\n1\n\\]"]
-,Plain [Str "\\begin{align}\n\\sum_i a_i^2 &= 1 + 1 \\\\\n&= 2.\n\\end{align}"]
+,Para [Math InlineMath " \\sum_i a_i^2 = 1 "]
+,Para [Math DisplayMath "\\sum_i a_i^2\n=\n1"]
+,Para [Math DisplayMath "\\begin{aligned}\n\\sum_i a_i^2 &= 1 + 1 \\\\\n&= 2.\n\\end{aligned}"]
+,Para [Str "edge",Space,Str "case",Space,Str "(the",Space,Code ("",[],[]) "c^2 + ",Space,Str "after",Space,Str "the",Space,Str "multline",Space,Str "tag",Space,Str "is",Space,Str "in",Space,Str "the",Space,Str "equation):"]
+,Para [Math DisplayMath "\\begin{gathered}\nc^2 + \na^2 + b^2\n\\end{gathered}"]
+,Para [Str "edge",Space,Str "case",Space,Str "(the",Space,Str "tag",Space,Str "is",Space,Code ("",[],[]) "hello%bye",Str ")"]
+,Para [Math DisplayMath "\\begin{hello%bye}\n\\int_a^b f(x) dx\n\\end{hello%bye}"]
 ,Para [Str "Just",Space,Str "two",Space,Str "dollar",Space,Str "signs:",Space,Str "$$"]
 ,Para [Str "[not",Space,Str "math]",Space,Str "You",Space,Str "have",Space,Str "$1",SoftBreak,Str "and",Space,Str "I",Space,Str "have",Space,Str "$1."]
 ,Header 2 ("tags",[],[]) [Str "tags"]

test/vimwiki-reader.wiki

@@ -297,6 +297,16 @@ $ \sum_i a_i^2 = 1 $
 &= 2.
 }}$
 
+edge case (the `c^2 + ` after the multline tag is in the equation):
+{{$%multline%c^2 + 
+a^2 + b^2
+}}$
+
+edge case (the tag is `hello%bye`)
+{{$%hello%bye%
+\int_a^b f(x) dx
+}}$
+
 Just two dollar signs: $$
 
 [not math] You have $1