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fix: escape leading tilde fences after wrap #591

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fix: escape leading tilde fences after wrap #591

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5 changes: 5 additions & 0 deletions src/mdformat/renderer/_context.py
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Original file line number Diff line number Diff line change
Expand Up @@ -459,6 +459,11 @@ def paragraph(node: RenderTreeNode, context: RenderContext) -> str: # noqa: C90
elif all(c == "=" for c in stripped):
lines[i] = lines[i].replace("=", "\\=", 1)

# Make sure a paragraph line does not start with three or more
# tildes (otherwise it will be interpreted as a fenced code block).
if re.match(r"~{3,}", lines[i]):
lines[i] = f"\\{lines[i]}"

# Check if the line could be interpreted as an HTML block.
# If yes, prefix it with 4 spaces to prevent this.
for html_seq_tuple in HTML_SEQUENCES:
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30 changes: 30 additions & 0 deletions tests/data/wrap_width_50.md
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Original file line number Diff line number Diff line change
Expand Up @@ -188,3 +188,33 @@ Starts with encoded space
.
 * * \*
.


Wrap three tildes to line start (issue #590)
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ~~~ BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
\~~~
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.


Wrap two tildes to line start
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ~~ BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
~~
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.


Wrap four tildes to line start
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ~~~~ BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
\~~~~
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.