pandoc markdown to pdf：修复丢失字符警告？

Question

我已经看到使用 Pandoc 和 LaTeX 从 docx 转换为 pdf 时如何修复“缺失字符”警告？- 但不幸的是，那里的建议似乎不适用于这个测试用例：

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$ git clone https://github.com/raspberrypi/documentation.git\n$ cd documentation/configuration\n$ pandoc *.md --pdf-engine=xelatex -o result.pdf\n[WARNING] Missing character: There is no \xe2\x94\x8c (U+250C) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n...\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x80 (U+2500) in font [lmmono10-regular]:!\n[WARNING] Missing character: There is no \xe2\x94\x98 (U+2518) in font [lmmono10-regular]:!\n

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因此，拉丁现代单声道中缺少一些特定的“方框图”字形 - 因此它们可能在代码片段的上下文中使用。

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在这种情况下有没有办法提供“后备字体”？或者我怎样才能解决这个问题，否则我可以通过 pandoc 从这些 Markdown 文件生成（Latex）PDF？

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---

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编辑：发现：

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• https://tex.stackexchange.com/questions/512396/inserting-any-unicode-character-in-latex-document
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• https://tex.stackexchange.com/questions/139139/adding-headers-and-footers-using-pandoc
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...所以我尝试：

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header-includes.yaml:

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

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...然后我尝试了（注意，仅使用存储库中的单个文件，raspi-config.md此处）：

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

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...所以，也无法让这种方法发挥作用...

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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。使用原始属性语法强制解释为 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选项传递该文件，这会将文件内容不变地插入到中间 LaTeX 文件中。