Create enumerate like indented nesting environment

Question

I want to create an environment that will have indentation to all the content inside it. Similar to \begin{enumberate}- \end{enumerate} but without need of writing \item

I tried doing it like this

\newenvironment{indented}
{\par\leftskip1cm\relax}
{\par\leftskip0cm\relax}

This works partially with 2 problems -

1. Nesting doesn't work.
2. Code listing using lstlisting doesn't honor this.

Please suggest how to make this work.

Answer 1

adjustwidth from changepage is an environment that allows you to adjust the left and right margin. Here's a simple implementation (using the base code from Niranjan's answer):

\documentclass{article}

\usepackage{changepage}
\usepackage{listings}
\lstset{basicstyle=\ttfamily}

\newenvironment{enumlike}[1][15pt]{%
  \begin{adjustwidth}{#1}{0pt}% Only indent on left side
}{%
  \end{adjustwidth}%
}

\begin{document}

\begin{enumlike}

  \begin{lstlisting}
#!/bin/usr
echo "hello world"
  \end{lstlisting}
  
  abcd efgh

  abcd efgh
  \begin{enumlike}[20pt]
    \begin{lstlisting}
#!/bin/usr
echo "hello world"
    \end{lstlisting}

    pqrs wxyz
    
    pqrs wxyz
  \end{enumlike}
\end{enumlike}

\end{document}

Note that 15pt - the default optional argument for enumlike - is the default \parindent, which could make things line up coincidently. Of course, this can be changed.

Answer 2

Why not to use the quote environment instead?

\documentclass{article}
\usepackage{listings}
\newenvironment{enumlike}{%
  \begin{quote}%
  }{%
  \end{quote}%
}

\begin{document}
\begin{enumlike}
  \begin{lstlisting}
#!/bin/usr
echo "hello world"
  \end{lstlisting}
  
  abcd efgh

  abcd efgh
  \begin{enumlike}
    \begin{lstlisting}
#!/bin/usr
echo "hello world"
    \end{lstlisting}

    pqrs wxyz
    
    pqrs wxyz
  \end{enumlike}
\end{enumlike}
\end{document}