From 2c857d379beea55210d7e130402e10a7e7b5e23c Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sat, 16 Aug 2025 19:21:39 -0700
Subject: Typst writer: add escapes to prevent inadvertent lists...

due to automatic wrapping.

Also simplify existing code that was meant to do this.

Closes #10047.
---
 src/Text/Pandoc/Writers/Typst.hs | 44 ++++++++++++++++------------------------
 test/command/10047.md            |  7 +++++++
 2 files changed, 25 insertions(+), 26 deletions(-)
 create mode 100644 test/command/10047.md

diff --git a/src/Text/Pandoc/Writers/Typst.hs b/src/Text/Pandoc/Writers/Typst.hs
index a5cdbc483..e4db9ffc6 100644
--- a/src/Text/Pandoc/Writers/Typst.hs
+++ b/src/Text/Pandoc/Writers/Typst.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE BangPatterns        #-}
+{-# LANGUAGE LambdaCase          #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {- |
    Module      : Text.Pandoc.Writers.Typst
@@ -77,9 +78,9 @@ pandocToTypst options (Pandoc meta blocks) = do
   let toPosition :: CaptionPosition -> Text
       toPosition CaptionAbove = "top"
       toPosition CaptionBelow = "bottom"
-  let nociteIds = query (\inln -> case inln of
-                                    Cite cs _ -> map citationId cs
-                                    _         -> [])
+  let nociteIds = query (\case
+                           Cite cs _ -> map citationId cs
+                           _         -> [])
                   $ lookupMetaInlines "nocite" meta
 
   let context = defField "body" main
@@ -160,12 +161,9 @@ blocksToTypst blocks = vcat <$> mapM blockToTypst blocks
 blockToTypst :: PandocMonad m => Block -> TW m (Doc Text)
 blockToTypst block =
   case block of
-    Plain inlines -> do
-      opts <- gets stOptions
-      inlinesToTypst (addLineStartEscapes opts inlines)
+    Plain inlines -> inlinesToTypst inlines
     Para inlines -> do
-      opts <- gets stOptions
-      ($$ blankline) <$> inlinesToTypst (addLineStartEscapes opts inlines)
+      ($$ blankline) <$> inlinesToTypst inlines
     Header level (ident,cls,_) inlines -> do
       contents <- inlinesToTypst inlines
       let lab = toLabel FreestandingLabel ident
@@ -504,23 +502,17 @@ mkImage opts useBox src attr
 
 textstyle :: PandocMonad m => Doc Text -> [Inline] -> TW m (Doc Text)
 textstyle s inlines = do
-  opts <-  gets stOptions
-  (<> endCode) . (s <>) . brackets
-    <$> inlinesToTypst (addLineStartEscapes opts inlines)
-
-addLineStartEscapes :: WriterOptions -> [Inline] -> [Inline]
-addLineStartEscapes opts = go True
- where
-   go True (Str t : xs)
-        | isOrderedListMarker t = RawInline "typst" "\\" : Str t : go False xs
-        | Just (c, t') <- T.uncons t
-        , needsEscapeAtLineStart c
-        , T.null t' = RawInline "typst" "\\" : Str t : go False xs
-   go _ (SoftBreak : xs)
-        | writerWrapText opts == WrapPreserve = SoftBreak : go True xs
-   go _ (LineBreak : xs) = LineBreak : go True xs
-   go _ (x : xs) = x : go False xs
-   go _ [] = []
+  (<> endCode) . (s <>) . brackets . fixInitialAfterBreakEscape
+    <$> inlinesToTypst inlines
+
+fixInitialAfterBreakEscape :: Doc Text -> Doc Text
+fixInitialAfterBreakEscape (Concat x y) =
+  Concat (fixInitialAfterBreakEscape x) y
+-- make an initial AfterBreak escape unconditional (it will be rendered
+-- in a block [..] and there won't be an actual break to trigger it, but
+-- typst still needs the escape)
+fixInitialAfterBreakEscape (AfterBreak "\\") = Text 1 "\\"
+fixInitialAfterBreakEscape x = x
 
 isOrderedListMarker :: Text -> Bool
 isOrderedListMarker t = not (T.null ds) && rest == "."
@@ -530,7 +522,7 @@ escapeTypst :: Bool -> EscapeContext -> Text -> Doc Text
 escapeTypst smart context t =
   (case T.uncons t of
     Just (c, _)
-      | needsEscapeAtLineStart c
+      | needsEscapeAtLineStart c || isOrderedListMarker t
         -> afterBreak "\\"
     _ -> mempty) <>
   (literal (T.replace "//" "\\/\\/"
diff --git a/test/command/10047.md b/test/command/10047.md
new file mode 100644
index 000000000..c651a1b43
--- /dev/null
+++ b/test/command/10047.md
@@ -0,0 +1,7 @@
+```
+% pandoc -t typst --wrap=auto
+Full-time study: 2001-2003; Thesis submission: Nov 2005; Award: Jul 2006.
+^D
+Full-time study: 2001-2003; Thesis submission: Nov 2005; Award: Jul
+\2006.
+```
-- 
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