Indenting with poemscol package

Question

I'm trying to typeset a poem collection with poemscol. The result looks like this:

I'd like to control the distances marked in red (I don't want any moving to the right); but all attempts with \setlength of \leftmargin, \titleindentamount etc. don't work, and I've never ventured this far into page setup details. Can someone provide a hint how this usually works?

The current code:

\documentclass[9pt, a5paper]{scrbook}
\usepackage[a5paper]{geometry}
\usepackage{fancyhdr}
\usepackage{poemscol}
\begin{document}
\poemtitle{I dwell in Possibility}
\attribution{E. Dickinson (1830--1886)}
\begin{poem}
\begin{stanza}
\textsc{I dwell} in Possibility --\\
A fairer House than Prose --
\end{stanza}
\end{poem}
\end{document}

I tried to track the indentation in the poemscol package, but without success. I cannot find the commands in the package that control this behavior. What is their name and where are they?

Answer 1

In the most recent version of poemscol, you can adjust the left and right margins of epigraphs by changing the values of \epigraphquoteleftmargin or \epigraphquoterightmargin.

You can adjust the placement of the verse block by changing the value of the length \versemarginadjust.

Answer 2

The indentation of the poem author is indeed, as egreg has commented, hardcoded in the epigraphquote environment, so you have to change its definition. The environment used to typeset the poem proper is pmclverse (which inherits an optional argument from the poem environment). Its formula to determine margins only seems to allow to increase, but not to decrease the left margin, so I decided to change (simplify) its definition as well.

\documentclass[9pt, a5paper]{scrbook}
\usepackage[a5paper]{geometry}
\usepackage{fancyhdr}
\usepackage{poemscol}
\renewenvironment{epigraphquote}%
{\list{}{%
  \topsep 0pt%
  \partopsep 0pt%
  \listparindent 0pt%
  \leftmargin  1em% original value: 1.5em
  \rightmargin 1em% original value: 1.5em
}%
\item\relax}
{\endlist}
\makeatletter
\renewenvironment{pmclverse}[1][]{%
\let\\=\@centercr%
\list{}{%
  \itemsep\z@
  \itemindent -\runoverindentvalue
  \listparindent \itemindent
  \leftmargin 2em% change as desired
  \rightmargin 2em% change as desired
  \advance\leftmargin\runoverindentvalue
}%
\item[]}
{\endlist}
\makeatother
\begin{document}
\poemtitle{I dwell in Possibility}
\attribution{E. Dickinson (1830--1886)}
\begin{poem}
\begin{stanza}
\textsc{I dwell} in Possibility --\\
A fairer House than Prose --
\end{stanza}
\end{poem}
\end{document}