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%% This is part of OpTeX project, see http://petr.olsak.net/optex

\_codedecl \cite {Cite, Biblioraphy <2020-03-09>} % loaded in format

   \_doc -----------------------------
   Registers used by `\cite`, `\bib` macros are declared here.
   The \`\bibnum` counts the bibliography items from one.
   The \`\bibmark` is used when `\nonumcitations` is set.
   \_cod -----------------------------

\_newcount\_bibnum                       % the bibitem counter
\_newtoks\_bibmark                       % the bibmark used if \nonumcitations
\_newcount\_lastcitenum \_lastcitenum=0  % for \shortcitations
\_public \bibnum \bibmark ; 

   \_doc -----------------------------
   \`\cite` `[<label>,<label>,...,<label>]` manages <labes> using `\_citeA` 
   and prints `[<bib-marks>]` using `\_printsavedcites`.
   \nl
   \`\nocite` `[<label>,<label>,...,<label>]` only manages <labels> but prints nothing.
   \nl
   \`\rcite` `[<label>,<label>,...,<label>]` behaves like `\cite` but prints
    <bib-marks> without brackets. 
   \nl
   \`\ecite` `[<label>]{<text>}` behaves like `\rcite [<label>]` but prints
   <text> instead <bib-mark>. The <text> is hyperlinked like <bib-marks>
   when `\cite` or `\rcite` is used. 
   The emptpty internal macro \`\_savedcites` will include the `<bib-marks>` list to
   be printed. This list is set by `\_citeA` inside group and it is used by
   `\_printsavedcites` in the same group. Each `\cite`/`\rcite`/`\ecite`  macro 
   starts from empty list of <bib-marks> because new group is opened.
   \_cod -----------------------------

\_def\_cite[#1]{{\_citeA#1,,,[\_printsavedcites]}}
\_def\_nocite[#1]{{\_citeA#1,,,}}
\_def\_rcite[#1]{{\_citeA#1,,,\_printsavedcites}}
\_def\_ecite[#1]{\_bgroup\_citeA#1,,,\_ea\_eciteB\_savedcites;}
\_def\_eciteB#1,#2;#3{\_if?#1\_relax #3\_else \_ilink[cite:#1]{#3}\_fi\_egroup}
\_def\_savedcites{}

\_public \cite \nocite \rcite \ecite ;

   \_doc -----------------------------
   `<bib-marks>` may be numbers or a special text related to cited bib-entry.
   It depends on \`\nonumcitations` and on used bib-style. The mapping from
   <label> to <bib-mark> is done when `\bib` or `\usebib` is processed.
   These macros store the information to
   \`\_Xbib``{<label>}{<number>}{<nonumber>}` where <number> and <nonumber> are
   two variants of <bib-mark> (numbered or text-like). This information is
   read from `.ref` file and it is saved to macros
   `\_bib:<label>` and `\_bibm:<number>`. First one includes number and second
   one includes <nonumber>. The `\_lastbibnum` macro includes last number of
   bib-entry used in the document. A designer can use it to set appropriate
   indentation when printing the list of all bib-entries.
   \_cod -----------------------------

\_def\_Xbib#1#2#3{\_sdef{_bib:#1}{\_bibnn{#2}&}%
   \_if^#3^\_else\_sdef{_bim:#2}{#3}\_fi\_def\_lastbibnum{#2}}

   \_doc -----------------------------
   \`\_citeA` `<label>,` processes one label from list of labels given in the
   parameter of `\cite`, `\nocite`, `\rcite` or `\ecite` macros. It adds the
   <label> to global list `\_citelist` which will be used by `\usebib` (it
   must to know what <labels> are used in the document in order to pick-up
   only relevant bib-entries from the database. Because we want to save
   space and not to save the same <label> to `\_citelist` twice, we
   distinguish four cases:
   \begitems
   * `<label>` was not declared by \^`\_Xbib` and it is first such <label> in the
     document: Then `\_bib:<label>` is undefined and we save label using
     `\_addcitlist`, write warning on the terminal and define
     `\_bib:<label>` as empty.
   * `<label>` was not declared by \^`\_Xbib` but it was used previously in the
     document: Then `\_bib:<label>` is empty and we do nothing (only data to
     `\_savedcites` are saved).
   * `<label>` was declared by \^`\_Xbib` and it is first such <label> in the
     document: Then `\_bin:<label>` includes `\_bibnn{<number>}&` and we
     test this case by `\if &\_bibnn{<number>}&`. This is true when `\_bibnn{<number>}`
     expands to empty. The <label> is saved by `\_addcitelist` and 
     `\_bib:<label>` is re-defined directly as <number>.
   * `<label>` was declared by \^`\_Xbib` and it was used previously in the
     document. Then we do nothing (only data to `\_savedcites` are saved.
   \enditems
   The `\_citeA` macro runs repeatedly over whole list of <labels>.
   \_cod -----------------------------

\_def\_citeA #1#2,{\_if#1,\_else 
   \_if *#1\_addcitelist{*}\_ea\_skiptorelax \_fi
   \_ifcsname _bib:#1#2\_endcsname \_else
      \_addcitelist{#1#2}%
      \_opwarning{The cite [#1#2] unknown. Try to TeX me again}\_openref
      \_addto\_savedcites{?,}\_def\_sortcitesA{}\_lastcitenum=0
      \_ea\_gdef \_csname _bib:#1#2\_endcsname {}%
      \_ea\_skiptorelax \_fi
   \_ea\_ifx \_csname _bib:#1#2\_endcsname \_empty
      \_addto\_savedcites{?,}\_def\_sortcitesA{}\_lastcitenum=0
      \_ea\_skiptorelax \_fi
   \_def\_bibnn##1{}%
   \_if &\_csname _bib:#1#2\_endcsname 
      \_def\_bibnn##1##2{##1}%
      \_addcitelist{#1#2}%
      \_sxdef{_bib:#1#2}{\_csname _bib:#1#2\_endcsname}%
   \_fi
   \_edef\_savedcites{\_savedcites \_csname _bib:#1#2\_endcsname,}%
   \_relax
   \_ea\_citeA\_fi
}
\_def\_addcitelist#1{\_global\_addto\_citelist{\_citeI[#1]}}
\_def\_citelist{} 

   \_doc -----------------------------
   The `<bib-marks>` (in numeric or text form) are saved in \^`\_savedcites`
   macro separated by commas.
   The \`\_printsavedcites` prints them by normal order or sorted if
   \`\sortcitations` is specified or condensed if \`\shordcitations` is
   specified.\nl 
   The `\sortcitations` appends the dummy number 300000 and we suppose that normal 
   numbers of bib-entries are less than this constant. 
   This constant is removed after sorting algorithm.
   The \`\shortcitations` sets simply `\_lastcitenum=1`.
   The macros for <bib-marks> printing follows (sorry, without detail
   documentation). They are documented in `opmac-d.pdf` (but only in Czech).
   \_cod -----------------------------

\_def\_printsavedcites{\_sortcitesA 
   \_chardef\_tmpb=0 \_ea\_citeB\_savedcites,%
   \_ifnum\_tmpb>0 \_printdashcite{\_the\_tmpb}\_fi
}
\_def\_sortcitesA{}
\_def\_sortcitations{%
  \_def\_sortcitesA{\_edef\_savedcites{300000,\_ea}\_ea\_sortcitesB\_savedcites,%
                    \_def\_tmpa####1300000,{\_def\_savedcites{####1}}\_ea\_tmpa\_savedcites}%
}
\_def\_sortcitesB #1,{\_if $#1$%
  \_else
     \_mathchardef\_tmpa=#1
     \_edef\_savedcites{\_ea}\_ea\_sortcitesC \_savedcites\_end
     \_ea\_sortcitesB 
  \_fi
}
\_def\_sortcitesC#1,{\_ifnum\_tmpa<#1\_edef\_tmpa{\_the\_tmpa,#1}\_ea\_sortcitesD 
                   \_else\_edef\_savedcites{\_savedcites#1,}\_ea\_sortcitesC\_fi}
\_def\_sortcitesD#1\_end{\_edef\_savedcites{\_savedcites\_tmpa,#1}}

\_def\_citeB#1,{\_if$#1$\_else
   \_if?#1\_relax??%
      \_else
      \_ifnum\_lastcitenum=0   % only comma separated list
         \_printcite{#1}%
      \_else
         \_ifx\_citesep\_empty  % first cite item
            \_lastcitenum=#1\_relax
            \_printcite{#1}%
         \_else               % next cite item
            \_advance\_lastcitenum by1
            \_ifnum\_lastcitenum=#1\_relax % cosecutive cite item
               \_mathchardef\_tmpb=\_lastcitenum
            \_else  % there is a gap between cite items
               \_lastcitenum=#1\_relax
               \_ifnum\_tmpb=0 % previous items were printed
                  \_printcite{#1}%
               \_else
                  \_printdashcite{\_the\_tmpb}\_printcite{#1}\_chardef\_tmpb=0
   \_fi\_fi\_fi\_fi\_fi
   \_ea\_citeB\_fi
}
\_def\_shortcitations{\_lastcitenum=1 }

\_def\_printcite#1{\_citesep\_ilink[cite:#1]{\_citelinkA{#1}}\_def\_citesep{,\_hskip.2em\_relax}}
\_def\_printdashcite#1{\_ifmmode-\_else\_hbox{--}\_fi\_ilink[cite:#1]{\_citelinkA{#1}}}
\_def\_citesep{}

\_def\_nonumcitations{\_lastcitenum=0\_def\_sortcitesA{}\_def\_etalchar##1{$^{##1}$}%
   \_def\_citelinkA##1{\_isdefined{_bim:##1}\_iftrue \_csname _bim:##1\_endcsname
      \_else ##1\_opwarning{\_noexpand\_nonumcitations + empty bibmark. Maybe bad BibTeX style}\_fi}
}
\_def\_citelinkA{}

\_public \nonumcitations \sortcitations \shortcitations ;

   \_doc -----------------------------
   The \`\bib` `[<label>] {<optional bib-mark>}` prints one bib-entry
   without reading any database. The bib-enty follows after this command.
   This command counts the used `\bib`s from one by `\bibnum` counter and
   saves \^`\_Xbib``{<label>}{\_the\_bibnum}{\_the\_bibmark}` into `.ref` file
   immediately using `\_wbib`. This is the core of creation of mapping from 
   `<labels>` to `<bib-marks>`.
   \_cod -----------------------------

\_def\_bib[#1]{\_def\_tmp{\_isnextchar={\_bibA[#1]}{\_bibmark={}\_bibB[#1]}}%
   \_ea\_tmp\_romannumeral-`\.} % ignore optional space
\_def\_bibA[#1]=#2{\_bibmark={#2}\_bibB[#1]}
\_def\_bibB[#1]{\_par \_bibskip
   \_advance\_bibnum by1
   \_noindent \_def\_tmpb{#1}\_wbib{#1}{\_the\_bibnum}{\_the\_bibmark}%
   \_printlabel{#1}%
   \_printbib \_ignorespaces
}
\_def\_wbib#1#2#3{\_dest[cite:\_the\_bibnum]%
   \_ifx\_wref\_wrefrelax\_else \_immediate\_wref\_Xbib{{#1}{#2}{#3}}\_fi}

\_public \bib ;

   \_doc -----------------------------
   The \`\_printbib` prints the bib-entry itself. You can re-define it if you
   want different design. The `\_pritbib` starts in horizontal mode after
   `\noindent` and after the eventual hyperlink destination is inserted.
   By default, the `\_printbib` sets the indentation
   by `\hangindent` and prints numeric <bib-marks> by
   `\llap{[\the\bibnum]}` If `\nonumcitations` then the `\_citelinkA` is not
   empty and <bib-marks> (`\the\bibnum` nor `\the\bibmark`) are not printed. 
   The text of bib-entry follows. User can create this text manually 
   using `\bib` command or it is generated automatically from a `.bib` database 
   by `\usebib` command.

   The vertical space between bib-entries is controlled by \`\_bibskip` macro.
   \_cod -----------------------------

\_def \_printbib {\_hangindent=\_iindent
   \_ifx\_citelinkA\_empty \_hskip\_iindent \_llap{[\_the\_bibnum] }\_fi
}
\_def \_bibskip {\_ifnum\_bibnum>0 \_smallskip \_fi}

   \_doc -----------------------------
   The \`\usebib` command is implemted in `usebib.opm` file which is loaded
   when the `\usebib` command is firstly used. 
   The `usebib.opm` file loads the `librarian.tex` for scaning the `.bib`
   files. See the section~\ref[usebib], where the file `usebib.opm` is
   documented.
   \_cod -----------------------------

\_def\_usebib{\_par \_opinput {usebib.opm} \_usebib}
\_def\usebib{\_usebib}

   \_doc -----------------------------
   The macros above works if all `\cite` (or similar) commands are used
   before the `\usebib` command is used because `\usebib` prints only such
   bib-entries their <labels> are saved in the `\_citelist`. But if some
   `\cite` is used after `\usebib`, then `\usebib` sets `\_addcitelist` to
   \`\_writeXcite`, so such `\cite` saves the information to the
   `.ref`file in the format \`\_Xcite``{<label>}`. Such information are copied
   to `\_citelistB` during reading `.ref` file and `\usebib` concats two
   lists of <labels> from `\_citelist` and `\_citelistB` and
   uses this concatenated list.
   \_cod -----------------------------

\_def\_Xcite#1{\_addto\_citelistB{\_citeI[#1]}}
\_def\_writeXcite#1{\_openref\_immediate\_wref\_Xcite{{#1}}}
\_def\_citelistB{}

\_endcode % -------------------------------------

See end of the `usebib.opm` file for documentation about creating style
files `bib-<style>.opm`.

See end of the `bib-iso690.opm` file for large documentation about `.bib` files
structure and about usage of `iso690` bib-style.