在自定义环境中缩进

Question

你好。我有一个文档，正在使用自定义环境。我曾尝试将下一节的标题简单地作为子节，但就像我创建的自定义环境一样。但是，我希望所述环境“内”的文本（甚至是第一段）像我的文档的其余部分一样缩进（我使用包“indentfirst”）。这是一个 MWE：

\documentclass{book}
\usepackage{xcolor}
\usepackage{amssymb}
\usepackage{indentfirst}

\begin{document}
\chapter{Weekday Morning Prayers}
\section{Morning Prayers of Light}
\begin{prayerheading} 
  Tuesday Morning-Prayer V
\end{prayerheading}

O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc

For Thou art our God, and unto Thee do we send up glory: to the Father, and to the Son, and to the Holy Spirit, now and ever, and unto ages of ages. Amen. 

\end{document}

对于祈祷，我使用的环境如下：

\newenvironment{prayerheading}{% 
 \center\large\bfseries\color{red}%
 }
{\endcenter}

谢谢大家的帮助！

Answer 1

这里有几个选项：

1. \end{prayerheading}在和 以下文本之间留一个空行：

   \documentclass{book}
   \usepackage{xcolor}
   \newenvironment{prayerheading}
     {\center\large\bfseries\color{red}}
     {\endcenter}
   \begin{document}
   
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \begin{prayerheading}
   Tuesday Morning-Prayer V
   \end{prayerheading}
   
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \end{document}
   

2. 在结束环境后添加一个\par（这样就不需要明确给出一个空行）；注意，在这种情况下，需要 在环境定义中使用\begin{center}和而\end{center}不是：\center\endcenter

   \documentclass{book}
   \usepackage{xcolor}
   
   \newenvironment{prayerheading}
     {\begin{center}\large\bfseries\color{red}}
     {\end{center}\par}
   
   \begin{document}
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \begin{prayerheading}
   Tuesday Morning-Prayer V
   \end{prayerheading}
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \end{document}
   

3. 使用该titlesec包并自定义一个分段单元标题来产生所需的布局；在下面的例子中我使用了\subsection*（因为使用了无星号的版本\titlespacing，所以下面的段落将收到标准缩进）：

   \documentclass{book}
   \usepackage{xcolor}
   \usepackage{titlesec}
   
   \titleformat{name=\subsection,numberless}
     {\normalfont\large\bfseries\filcenter\color{red}}{}{0em}{}
   \titlespacing{\subsection}
     {0pt}{3.25ex plus 1ex minus .2ex}{1.5ex plus .2ex}
   
   \begin{document}
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \subsection*{Tuesday Morning-Prayer V}
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   O Treasury of Good Things, Ever-flowing fountain, Holy Father, etc etc
   \end{document}