我写过多个单页文档。句子主要由逐项列表组成。当书面文字超过一页长度并流入另一页时，我会通过更改序言将它们转换为两列。这涉及每次编译文档后返回源代码。我可以使用两列作为所有文档的默认设置，但对于适合单列的短文档，它看起来很奇怪。有没有办法可以自动执行此操作？每当文档长度超过页面长度时，它应该更改为两列而不是一列。
这是 MWE
% Created 2019-01-21 Mon 11:20
% Intended LaTeX compiler: xelatex
\documentclass[11pt]{article}
\usepackage{graphicx}
\usepackage{grffile}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage{capt-of}
\usepackage{hyperref}
\pagenumbering{}
\usepackage[a4paper, top=42mm, right=2cm, bottom=1.5cm]{geometry}
\usepackage{fontspec,xltxtra}
\usepackage{polyglossia}
\usepackage[Latin,Devanagari]{ucharclasses}
\setmainfont{Arial Unicode MS}
\setlength{\parindent}{0pt}
\author{Me}
\date{\today}
\title{}
\hypersetup{
pdfauthor={Me},
pdftitle={},
pdfkeywords={},
pdfsubject={},
pdfcreator={Emacs 25.3.1 (Org mode 9.1.14)},
pdflang={English}}
\begin{document}
Mr X Y Z
DOB XX XX 196X
Phone 982640xxxx
\today
\section*{Past History}
\label{sec:orgdd28594}
\begin{itemize}
\item Idiopathic ulcerative colitis (proctosigmoiditis) 2013
\end{itemize}
\section*{Follow up}
\label{sec:orgb1e6798}
Stool frequency of 4-6 per day, Painful. Bleeding separate from stools.
Bloating of abdomen
There is no weight loss.
\section*{Examination}
\label{sec:org1fd6fb7}
No abnormality detected
\section*{Investigations}
\label{sec:org168a269}
Complete blood count , Random blood sugar, sigmoidoscopy
SCHEDULED: \textit{<2019-01-23 Wed> }
\section*{Rx}
\label{sec:org0d9debc}
\begin{enumerate}
\item TAB VEGAZ OD (MESALAMIN) 1.2 GM TWICE DAILY (दिन में 2 बार) AFTER MEALS (खाने के बाद) X Long term
\item TAB FOLVITE (FOLIC ACID) 5 MG ONCE DAILY (दिन में 1 बार )1-0-0-0 X LONG TERM
\item CREMAGEL (DILTIAZEM) aply at anus after seitz bath twice daily (दिन में 2 बार) 1-0-1-0 x 15 days
\item TORBULK /LACTIFIBER 180 GM दो चम्मच पावडर एक गिलास पानी में डाल कर शाम को ले (सोते समय) 0-0-0-1 X 15 days
\item TAB CROCIN (PARACETAMOL) 500 MG 1 TABLET as and when needed (जब जरुरत हो तो दवा ले ) FOR FEVER OR PAIN
\item LIGNOX (LIGNOCAIN) GEL before and after defecation if severe anal pain
\end{enumerate}
\end{document}
答案1
您的示例没有显示任何使用编号的引用或分段单元。此外，没有明确使用hyperref。所以，下面我删除了这些元素。
最后，单列和双列布局的内容布局非常不同。以最初的“墓碑”信息为例。它主要包含在单列文档的左半部分。如果需要切换到双列文档，则上半部分的右侧会突然被利用，对于刚好滚动到两页的文档，切换到双列布局可以使其适合单页。
该解决方案的主要方法是将整个文档内容包装到oneortwocolumn宏中。
\documentclass{article}
\usepackage{xparse}% Unless you have an updated LaTeX (as of Oct 2020)
\newsavebox{\ONEorTWOcol}
\NewDocumentCommand{\oneortwocolumn}{s +m}{%
\IfBooleanTF{#1}{%
#2%
}{%
% Store the entire document in a box that one can extract measurements from
\begin{lrbox}{\ONEorTWOcol}%
\begin{minipage}[b]{\textwidth}
#2%
\end{minipage}
\end{lrbox}
% Check if box is taller than \textheight
\ifdim\ht\ONEorTWOcol>\textheight
% If so, reset the entire document in a two-column document
\begin{multicols}{2}
#2%
\end{multicols}
\else
% Otherwise, reset it in its original form
#2%
\fi
}
}
\usepackage{multicol,lipsum}
\usepackage[a4paper, top=42mm, right=2cm, bottom=1.5cm]{geometry}
\setlength{\parindent}{0pt}
\begin{document}
\oneortwocolumn{
Mr Random Randofsky
DOB 01-23-4567
Phone 123-456-7890
\today
\section*{Past History}
\begin{itemize}
\item Idiopathic ulcerative colitis (proctosigmoiditis) 2013
\end{itemize}
\section*{Follow up}
Stool frequency of 4-6 per day, Painful. Bleeding separate from stools.
Bloating of abdomen.
There is no weight loss.
\section*{Examination}
No abnormality detected
\section*{Investigations}
Complete blood count, Random blood sugar, sigmoidoscopy
SCHEDULED: 2019-01-23 Wed
% Check with \lipsum[1-5], which will be set in two-column mode on 1 page
\lipsum[1-10]
\section*{Rx}
\begin{enumerate}
\item First item
\item Second item
\item Third item
\item Fourth item
\item Fifth item
\item Final item
\end{enumerate}
}
\end{document}
如果将随机文本切换为\lipsum[1-5]，您会发现它将页面设置为单页上的两列。这是因为丢失的“墓碑”空间突然在双列设置下被占用。如果此切换导致设置不理想，请使用 的星号形式\oneortwocolumn*，这将强制输出为单列布局。
如果需要的话，可以扩展该方法以适应\ref不同情况。