% \@ifclassloaded{cnltx-doc}{}{%
%   \GenericError
%     {(cnltx.bbx)\@spaces\@spaces\@spaces\@spaces}
%     {cnltx bibliography style error: invalid class}
%     {See the cnltx bundle documentation for explanation.}
%     {%
%       The `cnltx' bibliography style can only be used with the `cnltx-doc'
%       document class%
%     }%
% }
\RequirePackage{cnltx-example}
\ProvidesFile{cnltx.bbx}[\cnltx@@date\space \cnltx@@version\space \cnltx@@info]

\RequireBibliographyStyle{alphabetic}
\ExecuteBibliographyOptions{block=ragged}

\DeclareBibliographyDriver{latex}{%
  \usebibmacro{bibindex}%
  \usebibmacro{begentry}%
  \usebibmacro{author}%
  \usebibmacro{maintainer}%
  \setunit{\labelnamepunct}\newblock
  \usebibmacro{title+subtitle}%
  \printfield{version}%
  \setunit{\addcomma\addspace}%
  \usebibmacro{date}%
  \newunit\newblock
  \usebibmacro{url+urldate}%
  \newunit\newblock
  \usebibmacro{finentry}%
}
\DeclareBibliographyAlias{package}{latex}
\DeclareBibliographyAlias{class}{latex}
\DeclareBibliographyAlias{bundle}{latex}

\newbibmacro{title+subtitle}{%
  \iffieldundef{title}{}{%
    \printfield{title}%
    \ifbibindex{\indexfield{title}}{}%
    \setunit{\adddot\addspace}%
    \iffieldundef{subtitle}{}{%
      \printfield{subtitle}%
      \setunit{\adddot\addspace}%
    }%
  }%
}

\newbibmacro*{maintainer}{%
  \printtext{%
    \ifnameundef{maintainer}
      {}
      {%
        \addcomma\addspace
        \ifnumgreater{\value{maintainer}}{1}
          {\GetTranslation{cnltx-maintainers}}
          {\GetTranslation{cnltx-maintainer}}%
        \addcolon\addspace
        \printnames{maintainer}%
      }%
  }%
}

\DeclareNameAlias[package]{maintainer}{default}
\DeclareNameAlias[class]{maintainer}{default}
\DeclareNameAlias[bundle]{maintainer}{default}

\DeclareIndexNameAlias[package]{maintainer}{default}
\DeclareIndexNameAlias[class]{maintainer}{default}
\DeclareIndexNameAlias[bundle]{maintainer}{default}

\DeclareFieldFormat[package]{title}{\pkg*{#1}}
\DeclareFieldFormat[class]{title}{\cls*{#1}}
\DeclareFieldFormat[bundle]{title}{\bnd*{#1}}

\DeclareIndexFieldFormat[package]{title}{%
  \ifstrequal{#1}{\KOMAScript}
    {\pkgidx[KOMA-Script]{\KOMAScript}}
    {\pkgidx{#1}}%
}
\DeclareIndexFieldFormat[class]{title}{%
  \ifstrequal{#1}{\KOMAScript}
    {\clsidx[KOMA-Script]{\KOMAScript}}
    {\clsidx{#1}}%
}
\DeclareIndexFieldFormat[bundle]{title}{%
  \ifstrequal{#1}{\KOMAScript}
    {\bndidx[KOMA-Script]{\KOMAScript}}
    {\bndidx{#1}}%
}

\DeclareIndexFieldFormat[package]{indextitle}{%
  \ifstrequal{#1}{\KOMAScript}
    {\pkgidx[KOMA-Script]{\KOMAScript}}
    {\pkgidx{#1}}%
}
\DeclareIndexFieldFormat[class]{indextitle}{%
  \ifstrequal{#1}{\KOMAScript}
    {\clsidx[KOMA-Script]{\KOMAScript}}
    {\clsidx{#1}}%
}
\DeclareIndexFieldFormat[bundle]{indextitle}{%
  \ifstrequal{#1}{\KOMAScript}
    {\bndidx[KOMA-Script]{\KOMAScript}}
    {\bndidx{#1}}%
}

\DeclareFieldFormat[package]{subtitle}{\mkbibemph{#1}}
\DeclareFieldFormat[class]{subtitle}{\mkbibemph{#1}}
\DeclareFieldFormat[bundle]{subtitle}{\mkbibemph{#1}}

\DeclareLabelname[package,class,bundle]{%
  \field{shortauthor}
  \field{author}
  \field{maintainer}
  \field{shorteditor}
  \field{editor}
  \field{translator}
}

\DeclareDriverSourcemap[datatype=bibtex]{
  \map{
    \step[fieldsource=info, fieldtarget=subtitle]
  }
}

\endinput

HISTORY:
2013/09/14 v0.4  - first version added to the bundle
2013/10/04 v0.7a - added drivers `@class' and `@bundle'
2013/11/22 v0.9  - made independent from the `cnltx-doc' class