Use \newline between amsrefs fields

Question

I use amsrefs package to format bibliography. The problem is that sometimes the lines are very badly typeset. The problem is often caused by a doi field. See the image below.

I would accept manual line break, even if the entry is not ragged on the right side. Simple \newline in the pages field leaves a comma in the line, which look badly (see the image below)

Any idea how to manually break lines with proper punctuation markstreatment? Here comes the MWE

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsrefs}
\renewcommand{\PrintDOI}[1]{DOI~#1}
\begin{document}

\begin{bibdiv}
\begin{biblist}
\bib{14}{article}{
  author={Kim, S.G.},
  title={The unit ball},
  journal={Kyungpook Math. J.},
  volume={53},
  date={2013},
  pages={295--306},
  doi={10.5666/KMJ.2013.53.2.295},
}
\end{biblist}
\end{bibdiv}
\end{document}

Answer 1

How about this extremely dirty hack?

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsrefs}
\renewcommand{\PrintDOI}[1]{DOI~#1}
\begin{document}

\DefineSimpleKey{bib}{doinewline}    
\BibSpec{article}{%
    +{}  {\PrintAuthors}                {author}
    +{,} { \textit}                     {title}
    +{.} { }                            {part}
    +{:} { \textit}                     {subtitle}
    +{,} { \PrintContributions}         {contribution}
    +{.} { \PrintPartials}              {partial}
    +{,} { }                            {journal}
    +{}  { \textbf}                     {volume}
    +{}  { \PrintDatePV}                {date}
    +{,} { \issuetext}                  {number}
    +{,} { \eprintpages}                {pages}
    +{,} { }                            {status}
    +{}  {, \newline\PrintDOI}          {doinewline}
    +{,} { \PrintDOI}                   {doi}
    +{,} { available at \eprint}        {eprint}
    +{}  { \parenthesize}               {language}
    +{}  { \PrintTranslation}           {translation}
    +{;} { \PrintReprint}               {reprint}
    +{.} { }                            {note}
    +{.} {}                             {transition}
    +{}  {\SentenceSpace \PrintReviews} {review}
}

\begin{bibdiv}
\begin{biblist}
\bib{14}{article}{
  author={Kim, S.G.},
  title={The unit ball},
  journal={Kyungpook Math. J.},
  volume={53},
  date={2013},
  pages={295--306},
  doinewline={10.5666/KMJ.2013.53.2.295},
}
\end{biblist}
\end{bibdiv}
\end{document}

Answer 2

Use the \linebreak command to get a line break with proper placement of the punctuation. See Section 8.5 of the package documentation for more details:

Section 8.5 Line breaks in the bibliography

Suppose you need to recommend to LaTeX that it break a line in a particular place. Suggesting a line break in the middle of a field presents no difficulties: just edit your final .bbl file and insert a \linebreak command:

subtitle={Toward a transformative hermeneutics\linebreak[3] of quantum gravity},

But what if you need to force a line break between two fields? At first blush you might fear that

subtitle={...hermeneutics of quantum gravity\linebreak[3]},

will cause a line break before the comma that amsrefs normally inserts after the title: Have no fear; amsrefs will detect this and automatically move the comma in front of the line break, as desired: