From bc508534a648b900c683e60b1cc9681ed606a723 Mon Sep 17 00:00:00 2001
From: Philip Pesca <phil.pesca@gmail.com>
Date: Tue, 23 Jul 2019 12:21:32 -0700
Subject: HTML writer: render inline formulas correctly with --webtex (#5656)

We add `\textstyle` to the beginning of the formula to ensure it will be rendered in inline style.
Closes #5655.
---
 src/Text/Pandoc/Writers/HTML.hs |  5 ++++-
 test/command/5655.md            | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 test/command/5655.md

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index a0f6f17f0..84fd404b1 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -1062,8 +1062,11 @@ inlineToHtml opts inline = do
       case writerHTMLMathMethod opts of
            WebTeX url -> do
               let imtag = if html5 then H5.img else H.img
+              let s = case t of
+                           InlineMath  -> "\\textstyle "
+                           DisplayMath -> ""
               let m = imtag ! A.style "vertical-align:middle"
-                            ! A.src (toValue $ url ++ urlEncode str)
+                            ! A.src (toValue $ url ++ urlEncode (s ++ str))
                             ! A.alt (toValue str)
                             ! A.title (toValue str)
               let brtag = if html5 then H5.br else H.br
diff --git a/test/command/5655.md b/test/command/5655.md
new file mode 100644
index 000000000..de5a923ae
--- /dev/null
+++ b/test/command/5655.md
@@ -0,0 +1,14 @@
+````
+% pandoc --webtex
+$T_n={n+1 \choose 2}$
+^D
+<p><img style="vertical-align:middle" src="https://latex.codecogs.com/png.latex?%5Ctextstyle%20T_n%3D%7Bn%2B1%20%5Cchoose%202%7D" alt="T_n={n+1 \choose 2}" title="T_n={n+1 \choose 2}" /></p>
+````
+
+````
+% pandoc --webtex
+$$T_n={n+1 \choose 2}$$
+^D
+<p><br /><img style="vertical-align:middle" src="https://latex.codecogs.com/png.latex?T_n%3D%7Bn%2B1%20%5Cchoose%202%7D" alt="T_n={n+1 \choose 2}" title="T_n={n+1 \choose 2}" /><br /></p>
+````
+
-- 
cgit v1.2.3