如何自動在自動換行後開始的每一行前面新增空格？

Question

我需要的是文檔中的第一行以及明確指定的中斷(\\) 後面的每一行，使其第一個字元和頁面左邊距之間有0 毫米空格（無空格）（這是預設行為） ，而每個由 TeX 隱式啟動的中斷（由於到達頁面的右邊距）後面的行以空格（第一個字元和頁面的左邊距之間）開始，該空格比前一行的空格大 10 毫米。

1234567890123456789012345678901234567 <- 37 characters before auto-wrap
This is very first line with no space
 while this is second line after
  automatic break.\\
This line also doesn't begin with
 space but this one does.

Answer 1

空行比 更清晰\\。

這是一種方法，使用\parshape：

\documentclass[twocolumn]{article}

\usepackage{xparse}

\ExplSyntaxOn

\NewDocumentEnvironment{bizarre}{O{\columnwidth}}
 {
  \par
  \setlength{\parindent}{0pt}
  \bp_make_parshape:n { #1 }
  \everypar{\parshape 50~\l_bp_parshape_tl}
 }
 {
  \par
 }

\tl_new:N \l_bp_parshape_tl
\dim_new:N \l_bp_parshape_dim

\cs_new:Nn \bp_make_parshape:n
 {
  \dim_set:Nn \l_bp_parshape_dim { #1 }
  \tl_set:Nx \l_bp_parshape_tl
   {
    \int_step_function:nN { 50 } \__bp_parshape:n
   }
 }
\cs_new:Nn \__bp_parshape:n
 {
  \dim_eval:n { 10mm*(#1-1) } ~
  \dim_eval:n { \l_bp_parshape_dim - 10mm*(#1-1) }
 }

\ExplSyntaxOff

\begin{document}

\begin{bizarre}
This is very first line with no space
 while this is second line after
  automatic break.

This line also doesn't begin with
 space but this one does.
\end{bizarre}

\begin{bizarre}[0.8\columnwidth]
This is very first line with no space
 while this is second line after
  automatic break.

This line also doesn't begin with
 space but this one does.
\end{bizarre}

\end{document}