% opmac-bib-simple ... the OPmac bib style for reading .bib databases
% Petr Olsak, version Apr. 2015 (beta)
% See the end of the file opmac-bib.tex for more information.
% You can compare this file with the old Forth-like BibTeX .bst files. 
% What seems to be more understandable?

\ifx\opmacbibstyle\undefined \errmessage
   {This file can be read by ``\string\usebib/? (simple) bibfiles'' command only}
   \endinput \fi

% misc:

\frenchspacing
\def\maybedot{\ifnum\spacefactor=\sfcode`\.\relax\else.\fi}
\tmpnum=\sfcode`\. \advance\tmpnum by-2 \sfcode`\.=\tmpnum 
\sfcode`\?=\tmpnum \sfcode`\!=\tmpnum
\let\.=\maybedot  % prevents from double periods

% Formating of Author/Editor lists:

\def\authorname{%
  \ifnum\NameCount>1
     \ifnum0\namecount=\NameCount \mtext{bib.and}\else , \fi
  \else
     \ifx\dobibmark\undefined \edef\dobibmark{\Lastname}\fi
  \fi
  \bprintc\Firstname{* }\bprintc\Von{* }\Lastname\bprintc\Junior{, *}%
}
\let\editorname=\authorname

% Preparing bib-mark (used when \nonumcitations is set):

\def\setbibmark{%  
   \ifx\dobibmark\undefined \def\dobibmark{}\fi
   \RetrieveFieldIn{bibmark}\tmp      
   \ifx\tmp\empty \RetrieveFieldIn{year}\tmp \edef\tmp{\dobibmark, \tmp}\fi                
   \bibmark=\expandafter{\tmp}%
}

% Multilinguals:      English     Czech     Slovak

\mtdef{bib.and}       {, and }    { a }     {}
\mtdef{bib.edition}   {edition}   {vydání}  {vydanie}
\mtdef{bib.masterthesis} {Master's Thesis}   {Diplomová práce}   {Diplomová práca}
\mtdef{bib.phdthesis} {Ph.D. Thesis}   {Disertační práce}  {Dizertačná práca}


\def\preurl{\hfil\break} 

% Non-standard fieldnames:

\CreateField {isbn}
\CreateField {doi}
\CreateField {url}
\CreateField {bibmark}

% Sorting:

\SortingOrder{name,year}{lfvj}
\SpecialSort {key}

% Entry types:

\sdef{print:END}{%
   \bprinta [note]       {*.}{}%
   \setbibmark
}  
\sdef{print:book}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
   \bprinta [edition]    {*~\mtext{bib.edition}.\ }{}%
   \bprinta [address]    {*: }{\bibwarning}%
   \bprinta [publisher]  {*, }{\bibwarning}%
   \bprinta [year]       {*.\ }{\bibwarning}%
   \bprinta [isbn]       {ISBN~*.\ }{\bibwarning}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\sdef{print:article}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprinta [title]      {*.\ }{\bibwarning}%
   \bprintb [journal]    {{\em##1}.\ }{\bibwarning}%
   \bprinta [year]       {*, }{}%
   \bprinta [volume]     {* }{}%
   \bprinta [number]     {(*), }{}%
   \bprinta [pages]      {*.\ }{}%
   \bprintb [doi]        {DOI~\ulink[http://dx.doi.org/##1]{##1}.\ }{}%
}
\sdef{print:inbook}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1.}\ }{\bibwarning}%
                         In:~%
   \bprinta [!editor]    {*,~eds.\ }{}%
   \bprintb [booktitle]  {{\em##1}.\ }{\bibwarning}% 
   \bprinta [address]    {*: }{\bibwarning}%
   \bprinta [publisher]  {*, }{\bibwarning}%
   \bprinta [year]       {*.\ }{\bibwarning}%
   \bprinta [chapter]    {*.\ }{%
                         \bprinta [pages]      {*.\ }{}}%
   \bprinta [isbn]       {ISBN~*.\ }{\bibwarning}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\slet{print:inproceedings}{print:inbook}

\sdef{print:incolection}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}.\ }{\bibwarning}%
   \bprinta [crossreff]  {In~\cite[*]. }{%
                         \bprinta [booktitle]  {*. }{\bibwarning}%
                         \bprinta [!editor]    {*,~eds.\ }{\bibwarning}%
                         \bprinta [edition]    {*~\mtext{bib.edition}.\ }{\bibwarning}%
                         \bprinta [address]    {*: }{\bibwarning}%
                         \bprinta [publisher]  {*, }{\bibwarning}%
                         \bprinta [year]       {*.\ }{\bibwarning}%
                         \bprinta [pages]      {*.\ }{}%   
                         \bprintb [url]        {\preurl\url{####1}. }{}}%
}
\sdef{print:conference}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
   \bprinta [edition]    {*~\mtext{bib.edition}.\ }{}%
   \bprinta [address]    {*: }{\bibwarning}%
   \bprinta [publisher]  {*, }{\bibwarning}%
   \bprinta [year]       {*.\ }{\bibwarning}%
   \bprinta [isbn]       {ISBN~*.\ }{}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\sdef{print:phdthesis}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
                         \mtext{bib.phdthesis}, %
   \bprinta [school]     {*.\ }{}%
   \bprinta [address]    {*, }{}%
   \bprinta [year]       {*.\ }{}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\sdef{print:mastersthesis}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
                         \mtext{bib.masterthesis}, %
   \bprinta [school]     {*.\ }{}%
   \bprinta [address]    {*, }{}%
   \bprinta [year]       {*.\ }{}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\sdef{print:proceedings}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
   \bprinta [publisher]  {*.\ }{%
                         \bprinta [organization] {*.\ }{\bibwarning}}%
}   
\sdef{print:techreport}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
                         \mtext{bib.techreport}.
   \bprinta [institution] {*.\ }{}%
}
\sdef{print:booklet}{%
   \bprinta [!author]    {*\.\ }{\bibwarning}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
   \bprinta [howpublished] {*.\ }{\bibwarning}%
}
\sdef{print:manual}{%
   \bprinta [!author]    {*\.\ }{}%
   \bprintb [title]      {{\em##1}\.\ }{\bibwarning}%
   \bprinta [year]       {*.\ }{}%
   \bprinta [institution] {*.\ }{}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}
\sdef{print:misc}{%
   \bprinta [!author]    {*\.\ }{}%
   \bprintb [title]      {{\em##1}\.\ }{}%
   \bprinta [howpublished] {*.\ }{}%
   \bprinta [institution] {*.\ }{}%
   \bprinta [series]     {*.\ }{}%
   \bprinta [year]       {*.\ }{}%
   \bprintb [url]        {\preurl\url{##1}. }{}%
}

%%% end of the style file

\endinput

You can copy this file to opmac-bib-yourname.tex and modify it by your
needs...