Custom environment with variable indentation and auto-line breaking?

Question

Say, I want the first line to have no indentation, but then subsequent lines to have a set amount of indentation. And I don't want to have to type "\" at the end of each line to break it. I'd also like to shorten the \begin{...} code.

So I want something like:

\BE
this is
my custom
enviro code
\EE

to output to pdf this:

this is
    my custom
    enviro code

I know how to create custom environments and commands, at least at a novice level by following other examples.

Basically, I am looking for a way to reproduce multiline R code exactly as it looks in the Console in RStudio with minimal typing on my part. So any suggestions as to how to do that are appreciated.

I also realize that R Markdown is probably the best option, but I'm trying to keep with traditional latex at the moment. Feel free to try and convince me otherwise as well. I also cannot get the "knit to pdf" working in RStudio, but that is a separate issue.

Here is a minimal working example:

\documentclass{article}
\usepackage{color}

\newcommand{\bR}{\ttfamily\color{blue}$>$ }
\newcommand{\eR}{\color{black}\rmfamily}

\begin{document}

Here is how I'd like to be able to type the latex code:

\bR
xbar=mean(x)
summary(x)
hist(x)
\eR

But here is what will give me the formatting that I want:

\bR
xbar=mean(x)\\
\hspace*{0.32in} summary(x) \\
\hspace*{0.32in} hist(x) \\
\eR

\end{document} 

One solution would be to have a separate command for subsequent lines (probably easiest fix). Another option would be to create a custom list environment. I could probably make those happen. I'm just hoping to figure out the best and most efficient way to achieve what I want.

===

EDIT: Using the answer below, I was able to make a slight edit that I am happy with.

\newenvironment{realR}{\obeylines\parindent5mm\noindent\ttfamily\color{blue}}{}
\newcommand{\rcp}{\noindent $>$ }

\begin{realR} 
    \rcp x = c()
    mean(x)
    summary(x)
\end{realR}

Answer 1

Here is a quick hack that does (almost) what you want. Personally, I recommend against using short hands like \bR and \eR as they make your document harder to read, which becomes more problematic if you have coauthors. This said, using the code below, writing

\bR xbar=mean(x)
summary(x)
hist(x)
\eR

will produce:

Note that it is crucial that the xbar=mean(x) is on the same line as the \bR! (This is the "almost" in "...does (almost) what you want".)

Here is the full code:

\documentclass{article}
\newenvironment{realR}{\obeylines\parindent8mm\noindent}{}
\newcommand\bR{\begin{realR}} % shorthands for environment
\newcommand\eR{\end{realR}}

\begin{document}

\bR xbar=mean(x)
summary(x)
hist(x)
\eR

\end{document}

As you can see the idea is to change the paragraph indentation with \parindent8mm and to turn off the indentation for the first line, with \noindent (sorry, I could not bring myself to use inches...). The \obeylines command tells TeX to use the natural line breaks.

EDIT

Even though you said this clearly enough, I didn't really take in that you are typesetting R-code. For this I recommend a different approach using listings. For example, you can produce:

using the code:

\documentclass{article}
\usepackage{listings}
\begin{document}

\begin{lstlisting}[language=R]
xbar=mean(x)
    summary(x)
    hist(x)
\end{lstlisting}

\end{document}

With only a little more effort essentially the same code will produce:

Here is the code with the extra effort:

\documentclass{article}
\usepackage[svgnames]{xcolor}
\usepackage{listings}
\lstdefinestyle{rcode}{
    language=R,
    backgroundcolor=\color{Gainsboro!50!White},
}
\lstnewenvironment{rcode}{\lstset{style=rcode}}{}

\begin{document}

\begin{rcode}
xbar=mean(x)
    summary(x)
    hist(x)
\end{rcode}

\end{document}