path: root/Master/texmf-dist/tex/latex/optex/base/usebib.opm

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

\_codedecl \MakeReference {Reading bib databases <2020-03-13>} % loaded on demand by \usebib

   \_doc -----------------------------
   Loading the `librarian.tex` macro package. See `texdoc librarian`
   for more information about it.
   \_cod -----------------------------

\_def\_tmp{}
\_let\_errmessageori=\_errmessage % we needn't \errmessage during \input librarian
\_def\_errmessage#1{\_def\_tmp{error}}
\_let\_newwriteori=\_newwrite % we need not to create \jobname.lbr:
\_def\_newwrite#1{\_csname lb@restoreat\_endcsname \_endinput}
\_def\_tmpb{\_catcode`\_=12 \_input librarian \_catcode`\_=11 }\_tmpb
\_let\_errmessage=\_errmessageori
\_let\_newwrite=\_newwriteori
\_ifx\_tmp\_empty\_else
  \_def\_usebib/#1 (#2) #3 {%
     \_opwarning{eTeX and (pdfTeX or XeTeX or LuaTeX) not detected}%
     \_immediate\_write16{\_space\_space
               But librarian package needs it. \_noexpand\usebib ignored.}%
  }
  \_endinput \_fi
\_private \BibFile \ReadList \SortList \SortingOrder \NameCount \AbbreviateFirstname
   \CreateField \RetrieveFieldInFor \RetrieveFieldIn ;

   \_doc -----------------------------
   The `\usebib` command.
   \_cod -----------------------------

\_def\_usebib/#1 (#2) #3 {%
  \_ifx\_citelist\_empty
     \_opwarning{No cited items. \_noexpand\usebib ignored}%
  \_else
     \_bgroup \_par
        \_emergencystretch=.3\_hsize
        \_ifx\_bibpart\_undefined \_def\_bibpart{none}\_fi
        \_def\_optexbibstyle{#2}%
        \_setctable\_optexcatcodes
        \_input bib-#2.opm
        \_the \_bibtexhook
        \_let\_citeI=\_relax \_xdef\_citelist{\_citelist\_citelistB}%
        \_global\_let\_addcitelist=\_writeXcite
        \_def\_tmp##1[*]##2\_relax{\_def\_tmp{##2}}\_expandafter\_tmp\_citelist[*]\_relax
        \_ifx\_tmp\_empty\_else % there was \nocite[*] used. 
           \_setbox0=\_vbox{\_hsize=\_maxdimen \_def\_citelist{}\_adef@{\_readbibentry}%
           \_input #3.bib
           \_expandafter}\_expandafter\_def\_expandafter\_citelist\_expandafter{\_citelist}%
        \_fi
        \_def\_citeI[##1]{\_csname lb@cite\_endcsname{##1}{\_bibpart}{}{}}\_citelist
        \_BibFile{#3}%
        \_if s#1\_SortList{\_bibpart}\_fi
        \_ReadList{\_bibpart}%
        \_restorectable
     \_egroup
  \_fi
}
\_def\_readbibentry#1#{\_readbibentryA}
\_def\_readbibentryA#1{\_readbibentryB#1,,\_relax!.}
\_def\_readbibentryB#1#2,#3\_relax!.{\_addto\_citelist{\_citeI[#1#2]}}

   \_doc -----------------------------
   Corrections in librarian macros.
   \_cod -----------------------------

\_tmpnum=\_catcode`\@  \_catcode`\@=11
\_def\lb@checkmissingentries#1,{% we needn't \errmessage here, only \opmacwarning
  \_def\lb@temp{#1}%
  \_unless\_ifx\lb@temp\lb@eoe
    \lb@ifcs{#1}{fields}%
            {}%
            {\_opwarning{\_string\_usebib: entry [#1] isn't found in .bib file(s)}}%
    \_ea\lb@checkmissingentries
  \_fi
}
\_def\lb@readentry#1#2#3,{% space before key have to be ingnored
  \_def\lb@temp{#2#3}%      we need case sensitive keys
  \_def\lb@next{\_ea\lb@gotoat\lb@gobbletoeoe}%
  \lb@ifcs\lb@temp{requested}%
          {\_let\lb@entrykey\lb@temp
           \lb@ifcs\lb@entrykey{fields}{}%
                {\lb@defcs\lb@entrykey{fields}{}%
                 \_lowercase{\lb@addfield{entrytype}{#1}}%
                 \_let\lb@next\lb@analyzeentry}}{}%
  \lb@next
}
\_let\lb@compareA=\lb@compare
\_let\lb@preparesortA=\lb@preparesort
\_def\lb@compare#1\lb@eoe#2\lb@eoe{% SpecialSort:
  \_ifx\lb@sorttype\lb@namestring
     \_ifx\_sortfield\_undefined \lb@compareA#1\lb@eoe#2\lb@eoe
     \_else 
        \_ea\_RetrieveFieldInFor\_ea{\_sortfield}\lb@entrykey\lb@temp
        \_ifx\lb@temp\_empty \_toks1={#1\lb@eoe}\_else \_toks1=\_ea{\lb@temp\lb@eoe}\_fi
        \_ea\_RetrieveFieldInFor\_ea{\_sortfield}\lb@currententry\lb@temp
        \_ifx\lb@temp\_empty \_toks2={#2\lb@eoe}\_else \_toks2=\_ea{\lb@temp\lb@eoe}\_fi
        \_edef\lb@temp{\_noexpand\lb@compareA\_space\_the\_toks1 \_space\_the\_toks2}\lb@temp
     \_fi
  \_else \lb@compareA#1\lb@eoe#2\lb@eoe \_fi
}
\_def\lb@preparesort#1#2\lb@eoe{%
  \_if#1-%
    \_def\lb@sorttype{#2}%
  \_else
    \_def\lb@sorttype{#1#2}%
  \_fi
  \lb@preparesortA#1#2\lb@eoe
}
\_def\_SpecialSort#1{\_def\_sortfield{#1}}
\_def\WriteImmediateInfo#1{}  % the existence of .lbr file bocks new reading of .bib
\_catcode`\@=\_tmpnum

   \_doc -----------------------------
   Main action per every entry.
   \_cod -----------------------------

\_def\MakeReference{\_par \_bibskip
  \_advance\_bibnum by1
  \_isdefined{_bim:\_the\_bibnum}\_iftrue
     \_edef\_tmpb{\_csname _bim:\_the\_bibnum\_endcsname}%
     \_bibmark=\_ea{\_tmpb}%
  \_else \_bibmark={}\_fi
  \_edef\_tmpb{\EntryKey}%
  \_noindent \_dest[cite:\_the\_bibnum]\_printlabel\EntryKey 
  \_printbib 
  {%  
     \_RetrieveFieldIn{entrytype}\_entrytype
     \_csname _print:BEGIN\_endcsname
     \_isdefined{_print:\_entrytype}\_iftrue 
        \_csname _print:\_entrytype\_endcsname
     \_else 
        \_ifx\_entrytype\_empty \_else
           \_opwarning{Entrytype @\_entrytype\_space from [\EntryKey] undefined}%
           \_csname _print:misc\_endcsname
     \_fi\_fi
     \_csname _print:END\_endcsname
     \_ifx\_wref\_wrefrelax\_else 
         \_immediate\_wref\_Xbib{{\EntryKey}{\_the\_bibnum}{\_the\_bibmark}}\_fi
  }\_par
}

   \_doc -----------------------------
   The \`\_bprinta`, \`\_bprintb`, \`\_bprintc`, \`\_bprintv` 
   commands used in the style files:
   \_cod -----------------------------

\_def\_bprinta {\_bprintb*}
\_def\_bprintb #1[#2#3]{%
   \_def\_bibfieldname{#2#3}%
   \_if!#2\_relax 
      \_def\_bibfieldname{#3}%
      \_RetrieveFieldIn{#3}\_bibfield
      \_ifx\_bibfield\_empty\_else
         \_RetrieveFieldIn{#3number}\_namecount
         \_def\_bibfield{\_csname _Read#3\_ea\_endcsname \_csname _pp:#3\_endcsname}%
      \_fi
   \_else
      \_RetrieveFieldIn{#2#3}\_bibfield
   \_fi
   \_if^#1^%
      \_ifx\_bibfield\_empty \_ea\_ea\_ea \_doemptyfield
      \_else \_ea\_ea\_ea \_dofullfield \_fi
   \_else \_ea \_bprintaA
   \_fi
}
\_def\_dofullfield#1#2{\_def\_dofield##1{#1}\_ea\_dofield\_ea{\_bibfield}}
\_def\_doemptyfield#1#2{\_def\_dofield##1{#2}\_ea\_dofield\_ea{\_bibfield}}
\_let\_Readauthor=\ReadAuthor  \_let\_Readeditor=\ReadEditor
\_def\_bprintaA #1#2{\_ifx\_bibfield\_empty #2\_else\_bprintaB #1**\_eee\_fi}
\_def\_bprintaB #1*#2*#3\_eee{\_if^#3^#1\_else\_ea\_bprintaC\_ea{\_bibfield}{#1}{#2}\_fi}
\_def\_bprintaC #1#2#3{#2#1#3}
\_def\_bprintc#1#2{\_bprintcA#1#2**\_relax}
\_def\_bprintcA#1#2*#3*#4\_relax{\_ifx#1\_empty \_else \_if^#4^#2\_else#2#1#3\_fi\_fi}
\_def\_bprintv [#1]#2#3{\_def\_tmpa{#2}\_def\_tmpb{#3}\_bprintvA #1,,}
\_def\_bprintvA #1,{%
   \_if^#1^\_tmpb\_else
      \_RetrieveFieldIn{#1}\_tmp
      \_ifx \_tmp\_empty 
      \_else \_tmpa \_def\_tmpb{}\_def\_tmpa{}%
      \_fi
   \_ea \_bprintvA
   \_fi
} 
\_sdef{_pp:author}{\_letNames\_authorname}
\_sdef{_pp:editor}{\_letNames\_editorname}
\_def\_letNames{\_let\_Firstname=\Firstname \_let\_Lastname=\Lastname
   \_let\_Von=\Von \_let\_Junior=\Junior
}

   \_doc -----------------------------
   Various macros + multilinguas.
   \_cod -----------------------------

\_def\_bibwarning{\_opwarning{Missing field "\_bibfieldname" in [\EntryKey]}}  

\_def\_mtdef#1#2#3#4{\_sdef{_mt:#1:en}{#2} \_sdef{_mt:#1:cs}{#3}
  \_if$#4$\_slet{_mt:#1:sk}{_mt:#1:cs}
  \_else  \_sdef{_mt:#1:sk}{#4}
  \_fi
}

\_endcode

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The file `usebib.opm` implements the command
`\usebib/<sorttype> (<style>) <bibfiles>`
where `<sorttype>` is one letter `c` (references ordered by citation order in
the text) or `s` (references ordered by key in the style file), 
`<style>` is the part of the name `bib-<style>.opm` of the style file
and `<bibfiles>` are one or more `.bib` file names without suffix separated by
comma without space. Example:

\begtt
\usebib/s (simple) mybase,yourbase
\endtt

This command reads the `<bibfiles>` directly and creates the list of
bibliographics references (only those declared by by `\cite[]` or
`\nocite[]` in the text). The formatting of such references is defined in the style
file. The usage is mentioned in user documentation too.

The principle \"first entry wins" is used. Suppose `\usebib/s (simple) local,global`.
If an entry with the same label is declared in `local.bib` and in
`global.bib` too then the first wins. So, you can set an exceptions in your
`local.bib` file for your document.

\seccc Notes for style writers

The `bib-<style>.opm` file must define the commands:

\begitems
* `\_authorname` ... formatting of one name in the authors list. The macro can
    use the following data: `\_NameCount` (the number of the currently
    processed author name in the list), `0\_namecount` (the total number of the
    authors in the list), `\_Lastname`, `\_Firstname`, `\_Von`, `\_Junior` 
    (the parts of the name). See the documentation of the librarian package 
    for more info.
* `\_editorname` ... the same as `\_authorname`, but for editors list.
* `_print:<entrytype>` (defined by `\_sdef`) for formatting the entry of `<entrytype>`.
    The `<entrytype>` have to be lowercase. This command can use the command:
* `\_bprinta [<fieldname>]  {<if defined>} {<if not defined>}`. The part <if defined>
    is executed if <fieldname> is declared in .bib file for the entry which is
    currently processed. Else the part <if not defined> is processed.
    The part <if defined> can include the `*` parameter which is replaced
    by the value of the <fieldname>. The part <if not defined> can include
    the `\_bibwarning` command if the <fieldname> is mandatory.
* `\_bprintb [<fieldname>]  {<if defined>} {<if not defined>}`. The same as
    `\_bprinta`, but the `##1` parameter is used instead `*`. Differences: `##1`
    parameter can be used more than once and can be enclosed in nested
    braces. The * parameter can be used at most once and cannot be enclosed
    in braces. Warning: if the `\_bprintb` commands are nested (`\_bprintb` in
    `\_bprintb`), then you need to write `####1` parameter for internal `\_bprintb`.
    But if `\_bprinta` commands are nested then the parameter is not duplicated.
* `\_pbprintc \macro {<if non-empty>}`. The <if non-empty> part is executed if
    `\macro` is non-empty. The * parameter can be used, it is replaced by
    the `\macro`.
* `\_bprintv [<field1>,<field2>,...] {<if defined>} {<if not defined>}`.
    The part <if defined> is executed if <field1> or <filed2> or ...
    is defined, else the second part <if not defined> is executed.
    There is one filed name or the list field names separated by commas.  
    The parts cannot include any parameter.
\enditems
%
There are two special fieldnames: `!author` and `!editor`. The processed list of
authors or editors (by repeatedly calling `\_authorname` or `\_editorname`) are 
used here insted of raw data.

You can define `_print:BEGIN` and/or `_print:END` which is executed at the begin or
end of each `<entrytype>`. The formatting does not solve the numbering and
paragraph indentation of the entry. This is processed by `\_printbib` macro
used in \OpTeX/ (and may be redefined by the author or document designer).

You can declare `\_bimark={something}` in the `_print:END` macro. This bibmark is
saved to the `.ref` file (created by \OpTeX/) and used in the next \TeX/ run as 
`\cite` marks when `\nonumcitations` is set.

The whole style file is read in the group during `\usebib` command is executed
before typesetting the reference list. Each definition or setting is local
here.

If you are using non-standard fieldnames in .bib database and bib. style,
you has to declare them by `\_CreateField {<fieldname>}`.

You can declare `\_SortingOrder` in the manner documented by librarian package.

If your style adds some words or abbreviations you can make them
multilingual by saying `\_mtext{<label>}` instead such word and
`\_mtdef{<label>} {<English>} {<Czech>} {<Slovak>}` declaration.
The right part is printed by current value of the `\language` regiter.
You can add more languages by re-defining the `\_mtdef` command. 
See the section \ref[langphrases] for more information. 

If you are using `\nonumcitations`, then the `\_bibmark` tokens register have to be
prepared in the style file (in `_print:BEGIN`, `_print:END`, in
`\_authorname` etc.) This value will be used in the `\cite[]` places 
in the document.

The example of the style file is in `bib-simple.opm`.

User or author of the `bib.` style can create the hidden field which has a
precedence while sorting names. Example:

\begtt
\CreateField {sortedby}
\SpecialSort {sortedby}
\endtt
Suppose that the .bib file includes:
\begtt
...
author   = "Jan Chadima",
sortedby = "Hzzadima Jan",
...
\endtt
Now, this author is sorted between H and I, because the Ch digraph in this
name has to be sorted by this rule.

If you need (for example) to place the autocitations before other citations,
then you can mark your entries in `.bib` file by `sortedby = "@"`, because this
character is sorted before `A`.

\_endinput

History:
--------

Apr. 2014:  released in OPmac
Jan. 2016:  "first entry wins" implemented
Apr. 2016:  \readentry -> \readbibentry, \usebib->\MakeReference
Feb. 2018:  \input librarian does not create \jobname.lbr

% Source:

% opmac-bib
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Petr Olsak, version Feb. 2018 (beta)

% This is module for OPmac macros, see http://petr.olsak.net/opmac.html
% The command:
%    \usebib/<sorttype> (<style>) (bibfiles>
% for direct reading .bib files by OPmac macros (without bibTeX) is implemented here.
% The implementation depends on librarian.tex package by Paul Isambert.
% Use:
%    \input opmac  \input opmac-bib
% or simply:
%    \input opmac-bib
% before using the command \usebib.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% end