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一个源文本，两个输出

tag-icon • tag-icon conditionals output source
一个源文本，两个输出

我的源文本很长。我想创建两个输出：

  1. 全部文本

  2. 仅此源文本的一小部分，通过条件命令选择

MWE（准确地说：不工作）

\documentclass{article}
\usepackage{lipsum}
\begin{document}
\newif\ifPIECES
\PIECEStrue
\section{Lorem ipsum dolor}
\lipsum[1]

\ifPIECES This is first small piece. I want this piece in two outputs. 
When PIECES is folse, I want all source text. \else\fi

\lipsum[2]

\ifPIECES This is second small piece.  \else\fi

\lipsum[3] 

\ifPIECES This is third small piece.  \else\fi

\lipsum[4]

\end{document}

我应该如何定义 LaTeX 命令？如你所见，我现在正在编程。

答案1

只需将所有else语句收集在一起即可减少输入和错误，如下所示。然后您只需将一行代码更改为 false，即PIECESfalse。

\documentclass{article}
\usepackage{lipsum}
\begin{document}
\newif\ifPIECES
\PIECEStrue
\section{Lorem ipsum dolor}
\lipsum[1]

\ifPIECES This is small piece. I want this piece in my PDF, when PIECES is true. 
When PIECES is folse, I want all source text.

This is second small piece. I want second small piece in my PDF, when PIECES is true. When PIECES is folse, I want all source text.

 This is third small piece. I want third small piece in my PDF, when PIECES is true. 
When PIECES is folse, I want all source text.  
\else
    \lipsum[2]
    \lipsum[3] 
    \lipsum[4]
\fi

\end{document}

第二个 MWE 按照评论使用命令宏。

\documentclass{article}
\usepackage{lipsum}
\begin{document}
\newif\ifPIECES
\PIECESfalse
\section{Lorem ipsum dolor}

\newcommand\twopieces[2]{%
\ifPIECES 
   #1
  \else
    #1#2
\fi
}

\twopieces{This is small piece. I want this piece in my PDF, when PIECES is true. 
   When PIECES is false, I want all source text.}{  \lipsum[2]}


\end{document}

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