我正在为我们的戏剧俱乐部编写一个 latex 类，用于协作编写戏剧剧本。因此，只要使用起来尽可能简单，该类可以根据需要尽可能复杂。
我们在类中有一个“说”命令，它会在左侧输出演员的名字和演员所说的文字。
然后我们有较长的文本块，通常是场景的介绍和设置。但是，有时我们有单行，不是通常的文本，而是导演命令。这些应该居中。
我想以某种方式设置类，使得两个\says命令之间的没有任何格式/命令的单个段落始终居中。但是，当有多个段落时，它应该是两端对齐的。
使用乳胶可以实现这一点吗？如果可以，我该怎么做？
添加示例源：
% ...
The stage is empty. On the front of the stage, there is a typewriter on a
table. The table is lit. In the typewriter there is a page with LaTeX code
on it. it is a stage play. pages upon pages of latex code are clutterd
around that table. commented by hand with percent-signs.
At the back of the stage, there is a black curtain. The floor of the stage
is a black carpet. The rest of the stage is dark and empty.
\says{Editor}{It is called La Tech, not latex like you fetishists think}
% this line would be centered, as it is only one paragraph between two "says"
he sinks to the ground
\says{Random Guy}{Why don't you write it like that if it is called like that?}
%these lines won't be centered as there are two paragraphs.
The light is getting brighter. The stage is still empty.
Now lightly latex-dressed women enter the stage
\says{Editor}{What the heck is that?}
或许可以定义一个控制字符来定义导演输入，比如> he sinks to the ground
答案1
您可以尝试使用如下新命令：
\documentclass[12pt]{article}
\newcommand{\dirsays}[1]{\sbox{0}{#1}%
\ifdim\wd0>\linewidth
#1
\else
\noindent\makebox[\linewidth]{#1}%
\fi}
\begin{document}
\dirsays{I am writing a latex-class for our theatre club.}
\bigskip
\dirsays{I am writing a latex-class for our theatre club for collaborative writing of theatre-scripts. So the class can be as complex as needed, as long as the usage is as easy as possible.}
\end{document}
