From 07284b39f90bd85d19d12e0880c1e2f215d1eb0c Mon Sep 17 00:00:00 2001
From: Daniel Gnoutcheff <gnoutchd@softwarefreedom.org>
Date: Mon, 20 Sep 2021 13:28:01 -0400
Subject: Accomodate IkiWiki's inline plugin

---
 app/Main.hs       | 19 +++++++++++++++++--
 fast-pandoc.cabal |  1 +
 package.yaml      |  1 +
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/app/Main.hs b/app/Main.hs
index cb924e5..ae8bece 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,4 +1,5 @@
 {-# OPTIONS_GHC -fno-full-laziness #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 -- Pandoc Markdown rendering for IkiWiki, implemented as a "external" (XML-RPC)
 -- plugin.
@@ -26,6 +27,8 @@ import Text.XML.HaXml.Escape (xmlUnEscape, stdXmlEscaper)
 import qualified Text.Pandoc as P
 import qualified Network.XmlRpc.Internals as XRI
 import qualified Text.Pandoc.Shared as PS
+import qualified Text.Pandoc.Definition as PD
+import qualified Text.Pandoc.Walk as PW
 
 -- Modified version of XMLParse.document that doesn't wait for anything after
 -- the top-level element
@@ -100,6 +103,18 @@ rpcHtmlize args = XRI.renderResponse . XRI.Return . XRI.ValueString .
 -- leaks memory like crazy.
 htmlize :: String -> String
 htmlize mdwn = either (error . show) T.unpack . P.runPure .
-  (P.writeHtml5String P.def =<<) . P.readMarkdown readOpts . PS.tabFilter 4 .
-  T.pack . filter (\c -> c `elem` "\t\n\r" || (c>=' ' && c/='\x7f')) $ mdwn
+  (P.writeHtml5String P.def . PW.walk preserveIkiInline =<<) .
+  P.readMarkdown readOpts . PS.tabFilter 4 . T.pack .
+  filter (\c -> c `elem` ("\t\n\r" :: String) || (c>=' ' && c/='\x7f')) $ mdwn
   where readOpts = P.def {P.readerExtensions = P.pandocExtensions}
+
+-- Lines of the form
+--   <div class="inline" id="some_string"></div>
+-- are placeholders inserted and expanded by IkiWiki's `inline` plugin.  They
+-- must be preserved exactly, character-for-character, or else IkiWiki's regex
+-- won't match.  Pandoc normally parses these as Div blocks, which won't do.
+preserveIkiInline :: PD.Block -> PD.Block
+preserveIkiInline (PD.Div (inlineId, ["inline"], []) []) =
+  PD.RawBlock (PD.Format "html") $
+    T.concat ["<div class=\"inline\" id=\"", inlineId, "\"></div>"]
+preserveIkiInline b = b
diff --git a/fast-pandoc.cabal b/fast-pandoc.cabal
index 44959f9..a0fb105 100644
--- a/fast-pandoc.cabal
+++ b/fast-pandoc.cabal
@@ -33,6 +33,7 @@ executable fast-pandoc
     , haxr
     , mtl
     , pandoc
+    , pandoc-types
     , polyparse
     , split
     , text
diff --git a/package.yaml b/package.yaml
index 64e09d2..9c94637 100644
--- a/package.yaml
+++ b/package.yaml
@@ -25,6 +25,7 @@ dependencies:
 - bytestring
 - text
 - pandoc
+- pandoc-types
 - haxr
 - HaXml
 - polyparse
-- 
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