pdf - pandoc Markdown 到 pdf : fixing missing character warnings?

Question

我见过How do I fix "missing character" warnings when converting from docx to pdf using Pandoc and LaTeX? - 但不幸的是，那里的建议似乎不适用于这个测试用例:

$ git clone https://github.com/raspberrypi/documentation.git
$ cd documentation/configuration
$ pandoc *.md --pdf-engine=xelatex -o result.pdf
[WARNING] Missing character: There is no ┌ (U+250C) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
...
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ─ (U+2500) in font [lmmono10-regular]:!
[WARNING] Missing character: There is no ┘ (U+2518) in font [lmmono10-regular]:!

因此，Latin Modern Mono 中缺少一些特定的“框绘图”字形 - 因此它们可能用于代码片段的上下文中。
在这种情况下，有没有办法提供“后备字体”？或者我怎么能解决这个问题，所以我可以通过pandoc从这些 Markdown 文件生成(Latex)PDF？

编辑:发现:

https://tex.stackexchange.com/questions/512396/inserting-any-unicode-character-in-latex-document

https://tex.stackexchange.com/questions/139139/adding-headers-and-footers-using-pandoc

......所以我试过: header-includes.yaml :

---
header-includes: |
    \usepackage{combofont}
    \setupcombofont{multiscript-regular}
    {
      {file:lmsans10-regular.otf:\combodefaultfeat} at #1pt,
      {file:DejaVuSans.ttf} at #1pt,
      {file:NotoSansCJK-Regular.ttc(0)} at #1pt
    }
    {
       {} ,
       fallback,
       fallback
    }
    \DeclareFontFamily{TU}{multiscript}{}
    \DeclareFontShape {TU}{multiscript}{m}{n} {<->combo*multiscript-regular}{}
    \fontfamily{multiscript}\selectfont
...

...然后我尝试了(注意，只使用来自 repo 的单个文件， raspi-config.md ，在这里):

$ pandoc header-includes.yaml ./raspi-config.md --pdf-engine=lualatex -o result.pdf
Error producing PDF.
! Paragraph ended before \setupcombofont  was complete.
<to be read again>
\par
l.61

......所以，也无法让这种方法发挥作用......

Answer 1

您可以通过检查 pandoc 如何解析输入来查看发生了什么，例如通过将其转换回 Markdown:pandoc -t native -s -t markdown -V header-includes='' header-includes.yaml

---
header-includes: |
  ```{=tex}
  \usepackage{combofont}
  \setupcombofont{multiscript-regular}
  ```
  { {file:lmsans10-regular.otf:`\combodefaultfeat`{=tex}} at \#1pt,
  {file:DejaVuSans.ttf} at \#1pt, {file:NotoSansCJK-Regular.ttc(0)} at
  \#1pt } { {} , fallback, fallback }
  `\DeclareFontFamily{TU}{multiscript}{}`{=tex}
  `\DeclareFontShape {TU}{multiscript}{m}{n}`{=tex}
  {\<-\>combo\*multiscript-regular}{}
  `\fontfamily{multiscript}`{=tex}`\selectfont`{=tex}
---

您会注意到某些部分不被识别为 TeX，而是被识别为纯文本。使用 raw attribute syntax 强制解释为 LaTeX 块:

---
header-includes: |
  - ```{=latex}
    \usepackage{combofont}
    \setupcombofont{multiscript-regular}
    {
      {file:lmsans10-regular.otf:\combodefaultfeat} at #1pt,
      {file:DejaVuSans.ttf} at #1pt,
      {file:NotoSansCJK-Regular.ttc(0)} at #1pt
    }
    {
       {} ,
       fallback,
       fallback
    }
    \DeclareFontFamily{TU}{multiscript}{}
    \DeclareFontShape {TU}{multiscript}{m}{n} {<->combo*multiscript-regular}{}
    \fontfamily{multiscript}\selectfont
    ```
...

或者，您可以将 TeX 片段写入文件并通过 -H 传递该文件。选项，这会将文件内容不变插入到中间 LaTeX 文件中。