Selectively modify some citations appearance

Question

I am using biblatex with the following setup:

\usepackage[style=nejm,hyperref,natbib,backend=biber,maxnames=2,minnames=1]{biblatex}

Let us consider, as an example, this citation. (

@article{RefWorks:41,
    author={K. J. Koval and J. J. Harrast and J. O. Anglen and J. N. Weinstein},
    year={2008},
    month={Sep},
    title={Fractures of the distal part of the radius. The evolution of practice over time. Where's the evidence?},
    journal={The Journal of bone and joint surgery.American volume},
    volume={90},
    number={9},
    pages={1855-1861},
}

When I am citing with \textcite{RefWorks:41}, I would like to make the name part Koval et al. appearing such as \textbf{\textsf{\textsc{Koval et al.}}}. In the meantime, the bibstyle should remain unchanged. In addition, it should be applied to selected citations (not to all, but to some specific ones depending the context.) Any ideas?Suggestions?

Edit: Further explanation: given the author key in the bib file author={K. J. Koval and J. J. Harrast and J. O. Anglen and J. N. Weinstein}, I would like to make the the "author" part of the output of \textcite bold whatever it is. I mean, with maxnames=2,minnames=1, the output should be Koval et al. [25], with maxnames=6,minnames=3 it should be Koval, Harrast, Anglen e Weinstein [25] with the latter part (25) left unchanged.

Also, if a reference is cited more than one time, i would like to choose which citation should be bolded (not all of them).

Answer 1

Normally, this would not take more than a few lines of code, the nejm style is based on numeric-comp though, and numeric-comp has a very peculiar handling of textcite to make sure everything looks nice. So we will have to copy quite some code for a very minor modification.

Our new bibmcaro boldtextcite is a verbatim copy of textcite's bibmacro with the \mkbibbold wrapper added around \printnames{labelnames}. \cbx@boldtextcite is a helper to define \boldtextcite in \DeclareCiteCommand{\boldtextcite}.

\makeatletter
\newbibmacro*{boldtextcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\usebibmacro{cite:comp}}
    {\usebibmacro{cite:dump}%
     \ifbool{cbx:parens}
       {\bibclosebracket\global\boolfalse{cbx:parens}}
       {}%
     \iffirstcitekey
       {}
       {\textcitedelim}%
     \usebibmacro{cite:init}%
     \ifnameundef{labelname}
       {\printfield[citetitle]{labeltitle}}
       {\mkbibbold{\printnames{labelname}}}%
     \global\booltrue{cbx:parens}%
     \addspace\bibopenbracket%
     \ifnumequal{\value{citecount}}{1}
       {\usebibmacro{prenote}}
       {}%
     \usebibmacro{cite:comp}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}}

\DeclareCiteCommand{\cbx@boldtextcite}
  {\usebibmacro{cite:init}}
  {\usebibmacro{citeindex}%
   \usebibmacro{boldtextcite}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}%
   \ifbool{cbx:parens}
     {\bibclosebracket\global\boolfalse{cbx:parens}}
     {}}

\DeclareCiteCommand{\boldtextcite}[\cbx@textcite@init\cbx@boldtextcite]
  {\gdef\cbx@savedkeys{}%
   \citetrackerfalse%
   \pagetrackerfalse%
   \DeferNextCitekeyHook%
   \usebibmacro{cite:init}}
  {\ifthenelse{\iffirstcitekey\AND\value{multicitetotal}>0}
     {\protected@xappto\cbx@savedcites{()(\thefield{multipostnote})}%
      \global\clearfield{multipostnote}}
     {}%
   \xappto\cbx@savedkeys{\thefield{entrykey},}%
   \iffieldequals{namehash}{\cbx@lasthash}
     {}
     {\stepcounter{textcitetotal}%
      \savefield{namehash}{\cbx@lasthash}}}
  {}
  {\protected@xappto\cbx@savedcites{%
     [\thefield{prenote}][\thefield{postnote}]{\cbx@savedkeys}}}
\makeatother

We now have to cite commands, the standard \textcite and \boldtextcite that turns the names bold.

MWE

\documentclass{article}
\usepackage{filecontents}
\usepackage[style=nejm,hyperref,natbib,backend=biber,maxnames=2,minnames=1]{biblatex}


\makeatletter
\newbibmacro*{boldtextcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\usebibmacro{cite:comp}}
    {\usebibmacro{cite:dump}%
     \ifbool{cbx:parens}
       {\bibclosebracket\global\boolfalse{cbx:parens}}
       {}%
     \iffirstcitekey
       {}
       {\textcitedelim}%
     \usebibmacro{cite:init}%
     \ifnameundef{labelname}
       {\printfield[citetitle]{labeltitle}}
       {\mkbibbold{\printnames{labelname}}}%
     \global\booltrue{cbx:parens}%
     \addspace\bibopenbracket%
     \ifnumequal{\value{citecount}}{1}
       {\usebibmacro{prenote}}
       {}%
     \usebibmacro{cite:comp}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}}

\DeclareCiteCommand{\cbx@boldtextcite}
  {\usebibmacro{cite:init}}
  {\usebibmacro{citeindex}%
   \usebibmacro{boldtextcite}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}%
   \ifbool{cbx:parens}
     {\bibclosebracket\global\boolfalse{cbx:parens}}
     {}}

\DeclareCiteCommand{\boldtextcite}[\cbx@textcite@init\cbx@boldtextcite]
  {\gdef\cbx@savedkeys{}%
   \citetrackerfalse%
   \pagetrackerfalse%
   \DeferNextCitekeyHook%
   \usebibmacro{cite:init}}
  {\ifthenelse{\iffirstcitekey\AND\value{multicitetotal}>0}
     {\protected@xappto\cbx@savedcites{()(\thefield{multipostnote})}%
      \global\clearfield{multipostnote}}
     {}%
   \xappto\cbx@savedkeys{\thefield{entrykey},}%
   \iffieldequals{namehash}{\cbx@lasthash}
     {}
     {\stepcounter{textcitetotal}%
      \savefield{namehash}{\cbx@lasthash}}}
  {}
  {\protected@xappto\cbx@savedcites{%
     [\thefield{prenote}][\thefield{postnote}]{\cbx@savedkeys}}}
\makeatother

\addbibresource{biblatex-examples.bib}
\begin{document}
\textcite{wilde,companion}

\boldtextcite{wilde,companion}

\printbibliography
\end{document}