From f016950ac751d13fdf29c3ef052d30345128254c Mon Sep 17 00:00:00 2001
From: Willem van den Ende <willem@qwan.eu>
Date: Thu, 30 Apr 2026 18:25:09 +0100
Subject: [PATCH] add DOCX support to Mermaid diagram rendering

- Transform.hs: DOCX case returns blocks unchanged (no unicode substitution needed)
- Mermaid.hs: DOCX uses PNG images at normal scale (like HTML, not 3x like PDF)
---
 .gitignore               | 1 +
 src/Docster/Mermaid.hs   | 3 +++
 src/Docster/Transform.hs | 3 ++-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index fc410f3..65bd2c2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,4 +18,5 @@ stack-setup-2.yaml
 analytics-charts.md
 architecture-deep-dive.md
 devcontainer.org
+.devcontainer/
 root.json
diff --git a/src/Docster/Mermaid.hs b/src/Docster/Mermaid.hs
index f288028..efe8f06 100644
--- a/src/Docster/Mermaid.hs
+++ b/src/Docster/Mermaid.hs
@@ -79,6 +79,8 @@ generateDiagramPaths (DiagramConfig _ (OutputDir outDir) format) (DiagramId diag
                in (svgFile, T.pack $ takeFileName svgFile)
        PDF  -> let pngFile = outDir </> diagIdStr <> ".png"
                in (pngFile, T.pack pngFile)
+       DOCX -> let pngFile = outDir </> diagIdStr <> ".png"
+               in (pngFile, T.pack pngFile)
 
 -- | Puppeteer configuration content for disabling sandbox
 puppeteerConfigContent :: Text
@@ -90,6 +92,7 @@ callMermaidProcess format mmdFile outputFile = do
   let baseArgs = case format of
         HTML -> ["-i", mmdFile, "-o", outputFile]
         PDF  -> ["-i", mmdFile, "-o", outputFile, "--scale", "3"]
+        DOCX -> ["-i", mmdFile, "-o", outputFile]
   
   -- Create temporary puppeteer config file
   result <- bracket
diff --git a/src/Docster/Transform.hs b/src/Docster/Transform.hs
index 09737b6..7676c53 100644
--- a/src/Docster/Transform.hs
+++ b/src/Docster/Transform.hs
@@ -36,8 +36,9 @@ transformDocument config docName (Pandoc meta blocks) = do
     Left err -> return $ Left err
     Right (newBlocks, _finalState) ->
       case dcOutputFormat config of
-        PDF -> return $ Right $ substituteUnicodeSymbols (Pandoc meta newBlocks)
+        PDF  -> return $ Right $ substituteUnicodeSymbols (Pandoc meta newBlocks)
         HTML -> return $ Right $ Pandoc meta newBlocks
+        DOCX -> return $ Right $ Pandoc meta newBlocks
 
 -- | Process a single block with heading tracking state
 processBlockStateful :: DiagramConfig -> Block -> TransformM Block