interaction between wrapping and markdown templates?

[cscheid]

When a template is used inside a markdown header, the template writer still breaks lines, and those are then interpreted by the Markdown reader to be in a new paragraph.

If I set "--wrap=none", then the problem goes away. But it feels strange that changing the wrapping can produce a breaking document here, since a long title by itself doesn't cause the markdown writer to break.

Is it simply not possible to use templates to solve this problem?

What best practices around the wrapping, templates, and newline-sensitive formats have you seen?

Thanks! More info below.

template.markdown

$if(title)$
# $title$

$endif$
$body$

input.md

---
title: "0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789"
---

Oh no

shell output

$ pandoc --version
pandoc 3.7.0.2
Features: +server +lua
Scripting engine: Lua 5.4
User data directory: /Users/cscheid/.local/share/pandoc
Copyright (C) 2006-2024 John MacFarlane. Web: https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.
$ pandoc -t markdown --template=template.markdown input.md

# 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
0123456789 0123456789 0123456789 0123456789

Oh no
$ pandoc -t markdown --template=template.markdown input.md | pandoc -t native
[ Header
    1
    ( "section" , [] , [] )
    [ Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    ]
, Para
    [ Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    , Space
    , Str "0123456789"
    ]
, Para
    [ Str "Oh"
    , Space
    , Str "no"
    ]
]

Pandoc version?

3.7.0.2, macos Apple Silicon, installed from Homebrew.

[tarleb]

I think $title/nowrap$ should fix that (unless I misunderstood the problem).

[jgm]

This is correct. See the manual under Templates, then "pipes."

[cscheid]

Ah, thank you, that's exactly it. I did search the manual, but missed that section. Apologies.