我使用 Pandoc 通过 LaTeX 生成 PDF 文档。我想在 verbatim 环境中使用一些默认情况下不可用的附加字符。以下是示例输入：
Math: $\downarrow$
Verbatim:
stuff
↓
thing
Text: ↓
的结果pandoc -s -o mnwe.tex mnwe.md：
\documentclass[]{article}
\usepackage{amssymb,amsmath}
\usepackage{ifxetex,ifluatex}
\ifxetex
\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\else
\ifluatex
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\else
\usepackage[utf8]{inputenc}
\fi
\fi
\ifxetex
\usepackage[setpagesize=false, % page size defined by xetex
unicode=false, % unicode breaks when used with xetex
xetex,
colorlinks=true,
linkcolor=blue]{hyperref}
\else
\usepackage[unicode=true,
colorlinks=true,
linkcolor=blue]{hyperref}
\fi
\hypersetup{breaklinks=true, pdfborder={0 0 0}}
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}
\setlength{\emergencystretch}{3em} % prevent overfull lines
\setcounter{secnumdepth}{0}
PDFLaTeX 编译日志：
\begin{document}
Math: $\downarrow$
Verbatim:
\begin{verbatim}
stuff
↓
thing
\end{verbatim}
Text: ↓
\end{document}
This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian)
entering extended mode
(./mnwe.tex
LaTeX2e <2009/09/24>
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, noh
yphenation, farsi, arabic, croatian, bulgarian, ukrainian, russian, czech, slov
ak, danish, dutch, finnish, french, basque, ngerman, german, german-x-2009-06-1
9, ngerman-x-2009-06-19, ibycus, monogreek, greek, ancientgreek, hungarian, san
skrit, italian, latin, latvian, lithuanian, mongolian2a, mongolian, bokmal, nyn
orsk, romanian, irish, coptic, serbian, turkish, welsh, esperanto, uppersorbian
, estonian, indonesian, interlingua, icelandic, kurmanji, slovenian, polish, po
rtuguese, spanish, galician, catalan, swedish, ukenglish, loaded.
(/usr/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/share/texmf-texlive/tex/latex/base/size10.clo))
(/usr/share/texmf-texlive/tex/latex/amsfonts/amssymb.sty
(/usr/share/texmf-texlive/tex/latex/amsfonts/amsfonts.sty))
(/usr/share/texmf-texlive/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/share/texmf-texlive/tex/latex/amsmath/amstext.sty
(/usr/share/texmf-texlive/tex/latex/amsmath/amsgen.sty))
(/usr/share/texmf-texlive/tex/latex/amsmath/amsbsy.sty)
(/usr/share/texmf-texlive/tex/latex/amsmath/amsopn.sty))
(/usr/share/texmf-texlive/tex/generic/ifxetex/ifxetex.sty)
(/usr/share/texmf-texlive/tex/generic/oberdiek/ifluatex.sty)
(/usr/share/texmf-texlive/tex/latex/base/inputenc.sty
(/usr/share/texmf-texlive/tex/latex/base/utf8.def
(/usr/share/texmf-texlive/tex/latex/base/t1enc.dfu)
(/usr/share/texmf-texlive/tex/latex/base/ot1enc.dfu)
(/usr/share/texmf-texlive/tex/latex/base/omsenc.dfu)))
(/usr/share/texmf-texlive/tex/latex/hyperref/hyperref.sty
(/usr/share/texmf-texlive/tex/latex/graphics/keyval.sty)
(/usr/share/texmf-texlive/tex/generic/oberdiek/ifpdf.sty)
(/usr/share/texmf-texlive/tex/generic/oberdiek/ifvtex.sty)
(/usr/share/texmf-texlive/tex/latex/oberdiek/hycolor.sty
(/usr/share/texmf-texlive/tex/latex/oberdiek/xcolor-patch.sty))
(/usr/share/texmf-texlive/tex/latex/hyperref/pd1enc.def)
(/usr/share/texmf-texlive/tex/generic/oberdiek/etexcmds.sty
(/usr/share/texmf-texlive/tex/generic/oberdiek/infwarerr.sty))
(/usr/share/texmf-texlive/tex/latex/latexconfig/hyperref.cfg)
(/usr/share/texmf-texlive/tex/latex/oberdiek/kvoptions.sty
(/usr/share/texmf-texlive/tex/generic/oberdiek/kvsetkeys.sty))
(/usr/share/texmf-texlive/tex/latex/hyperref/puenc.def)
Implicit mode ON; LaTeX internals redefined
(/usr/share/texmf-texlive/tex/latex/ltxmisc/url.sty)
(/usr/share/texmf-texlive/tex/generic/oberdiek/bitset.sty
(/usr/share/texmf-texlive/tex/generic/oberdiek/intcalc.sty)
(/usr/share/texmf-texlive/tex/generic/oberdiek/bigintcalc.sty
(/usr/share/texmf-texlive/tex/generic/oberdiek/pdftexcmds.sty
(/usr/share/texmf-texlive/tex/generic/oberdiek/ltxcmds.sty))))
(/usr/share/texmf-texlive/tex/generic/oberdiek/atbegshi.sty))
*hyperref using default driver hpdftex*
(/usr/share/texmf-texlive/tex/latex/hyperref/hpdftex.def) (./mnwe.aux)
(/usr/share/texmf-texlive/tex/latex/graphics/color.sty
(/etc/texmf/tex/latex/config/color.cfg)
(/usr/share/texmf-texlive/tex/latex/pdftex-def/pdftex.def
(/usr/share/texmf-texlive/tex/context/base/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
))) (/usr/share/texmf-texlive/tex/latex/hyperref/nameref.sty
(/usr/share/texmf-texlive/tex/latex/oberdiek/refcount.sty)) (./mnwe.out)
(./mnwe.out) (/usr/share/texmf-texlive/tex/latex/amsfonts/umsa.fd)
(/usr/share/texmf-texlive/tex/latex/amsfonts/umsb.fd)
! Package inputenc Error: Unicode char \u8:↓ not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
...
l.43 \end{verbatim}
? s
OK, entering \scrollmode...
! Package inputenc Error: Unicode char \u8:↓ not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
...
l.44 Text: ↓
[1{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] (./mnwe.aux) )
(see the transcript file for additional information)</usr/share/texmf-texlive/f
onts/type1/public/amsfonts/cm/cmr10.pfb></usr/share/texmf-texlive/fonts/type1/p
ublic/amsfonts/cm/cmsy10.pfb></usr/share/texmf-texlive/fonts/type1/public/amsfo
nts/cm/cmtt10.pfb>
Output written on mnwe.pdf (1 page, 32085 bytes).
Transcript written on mnwe.log.
我在本文档中使用了快速而粗糙的 ASCII 艺术图表，或者更确切地说是 Unicode 艺术，并且我希望它们保持这种状态，因此使用“适当的”图表包不是一个选择。我无法更改 Pandoc 生成环境的方式verbatim。
我不介意输出是否丑陋，$\downarrow$只要框具有适当的tt字体大小，包含 的框就可以了。但它必须作为源代码中的文字字符输入↓。这不必在普通文本中起作用，如果该字符只能在逐字环境中使用，那就没问题。
我可以告诉 Pandoc 在标题中包含额外的任意 LaTeX 命令。我可以添加什么来定义字符↓(U+2193) 以将其打印为类似↓正确大小的内容？
答案1
对于向下的箭头，答案是\usepackage{textcomp}。
\documentclass[]{article}
\usepackage{amssymb,amsmath}
\usepackage{ifxetex,ifluatex}
\ifxetex
\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX,Scale=MatchLowercase}
\else
\ifluatex
\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX,Scale=MatchLowercase}
\else
\usepackage[utf8]{inputenc}
\usepackage{textcomp}
\fi
\fi
\ifxetex
\usepackage[setpagesize=false, % page size defined by xetex
unicode=false, % unicode breaks when used with xetex
colorlinks=true,
linkcolor=blue]{hyperref}
\else
\usepackage[unicode=true,
colorlinks=true,
linkcolor=blue]{hyperref}
\fi
\hypersetup{breaklinks=true, pdfborder={0 0 0}}
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}
\setlength{\emergencystretch}{3em} % prevent overfull lines
\setcounter{secnumdepth}{0}
\begin{document}
Math: $\downarrow$
Verbatim:
\begin{verbatim}
stuff
↓
thing
\end{verbatim}
Text: ↓
\end{document}
