Vimwiki reader: Add nested syntax highlighting (#6257)

Nested syntaxes are specified like this:
{{{sql
SELECT * FROM table
}}}

The preformatted code block parser has been extended to check if the
first attribute of the block is not a `key=value` pair, and in that case
it will be considered as a class.

Closes #6256.

1 files changed, 2 insertions, 0 deletions

diff --git a/test/vimwiki-reader.native b/test/vimwiki-reader.native
index 3df91bec5..3b8c37c3a 100644
--- a/test/vimwiki-reader.native
+++ b/test/vimwiki-reader.native
@@ -49,6 +49,8 @@ Pandoc (Meta {unMeta = fromList [("date",MetaInlines [Str "2017-05-01"]),("title
 ,CodeBlock ("",[],[]) "  Tyger! Tyger! burning bright\n   In the forests of the night,\n    What immortal hand or eye\n     Could frame thy fearful symmetry?\n  In what distant deeps or skies\n   Burnt the fire of thine eyes?\n    On what wings dare he aspire?\n     What the hand dare sieze the fire?"
 ,Header 3 ("preformatted text with attributes",[],[]) [Str "preformatted",Space,Str "text",Space,Str "with",Space,Str "attributes"]
 ,CodeBlock ("",[],[("class","python"),("style","color:blue")]) " for i in range(1, 5):\n     print(i)"
+,Header 3 ("preformatted text with nested syntax",[],[]) [Str "preformatted",Space,Str "text",Space,Str "with",Space,Str "nested",Space,Str "syntax"]
+,CodeBlock ("",["sql"],[]) "SELECT * FROM table"
 ,Header 3 ("empty preformatted text",[],[]) [Str "empty",Space,Str "preformatted",Space,Str "text"]
 ,CodeBlock ("",[],[]) ""
 ,Header 2 ("block quotes",[],[]) [Str "block",Space,Str "quotes"]