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%% This is part of the OpTeX project, see http://petr.olsak.net/optex
\_codedecl \fnote {Footnotes, marginal notes OpTeX <2020-05-26>} % loaded in format
\_doc -----------------------------
\`\_gfnotenum` is a counter which counts footnotes globally in the whole document.\nl
\`\_lfnotenum` is a counter which counts footnotes at each chapter from one.
It is used for local page footnote counters too.\nl
\`\_ifpgfnote` says that footnote numbers are counted on each page from
one. We need to run `\openref` in this case.\nl
\`\fnotenum` is a macro that expands to footnote number counted in declared part.\nl
\`\fnotenumchapters` declares footnotes numbered in each chapter from one
(default), \`\fnotenumglobal` declares footnotes numbered in whole
document from one and \`\fnotenumpages` declares footnotes numbered
at each page from one.
\_cod -----------------------------
\_newcount\_gfnotenum \_gfnotenum=0
\_newcount\_lfnotenum
\_newifi \_ifpgfnote
\_def \_fnotenumglobal {\_def\_fnotenum{\_the\_gfnotenum}\_pgfnotefalse}
\_def \_fnotenumchapters {\_def\_fnotenum{\_the\_lfnotenum}\_pgfnotefalse}
\_def \_fnotenumpages {\_def\_fnotenum{\_trycs{_fn:\_the\_gfnotenum}{?}}\_pgfnotetrue}
\_fnotenumchapters % default are footnotes counted from one in each chapter
\_def \fnotenum{\_fnotenum}
\_public \fnotenumglobal \fnotenumchapters \fnotenumpages ;
\_let \runningfnotes = \fnotenumglobal % for backward compatibility
\_doc -----------------------------
The \`\_printfnotemark` prints the footnote mark. You can re-define this
macro if you want another design of footnotes. For example
\begtt
\fnotenumpages
\def \_printfnotemark {\ifcase 0\fnotenum\or
*\or**\or***\or$^\mathbox{†}$\or$^\mathbox{‡}$\or$^\mathbox{††}$\fi}
\endtt
This code gives footnotes* and ** and*** and$^\mathbox{†}$ etc.\
and it supposes that there are no more than 6 footnotes at one page.
If you want to distinguish between footnote marks in the text and in the front of
the footnote itself, then you can define `\_printfnotemarkA` and `\_printfnotemarkB`.
The \`\fnotelinks``<colorA><colorB>` implements the hyperlinked footnotes
(from text to footnote and backward).
\_cod -----------------------------
\_def \_printfnotemark {$^{\_fnotenum}$} % default footnote mark
\_def \_printfnotemarkA {\_printfnotemark} % footnote marks used in text
\_def \_printfnotemarkB {\_printfnotemark} % footnote marks used in front of footnotes
\_def \_fnotelinks#1#2{% <inText color> <inFootnote color>
\_def\_printfnotemarkA{\_link[fnt:\_the\_gfnotenum]{#1}{\_printfnotemark}%
\_dest[fnf:\_the\_gfnotenum]}%
\_def\_printfnotemarkB{\_link[fnf:\_the\_gfnotenum]{#2}{\_printfnotemark}%
\_dest[fnt:\_the\_gfnotenum]}%
}
\public \fnotelinks ;
\_doc ----------------------------
Each footnote saves the \`\_Xfnote` (without parameter) to the `.ref`
file (if `\openref`). We can create the mapping from `<gfnotenum>` to`<pgfnotenum>`
in the macro `\_fn:<fnotenum>`. Each \^`\_Xpage` macro sets the
`\_lfnotenum` to zero.
\_cod ----------------------------
\_def \_Xfnote {\_incr\_lfnotenum \_incr\_gfnotenum
\_sxdef{_fn:\_the\_gfnotenum}{\_the\_lfnotenum}}
\_doc ----------------------------
The \`\fnote` `{<text>}` macro is simple, \`\fnotemark` and \^`\fnotetext`
does the real work.
\_cod ----------------------------
\_def\_fnote{\_fnotemark1\_fnotetext}
\_def\_fnotemark#1{{\_advance\_gfnotenum by#1\_advance\_lfnotenum by#1\_relax \_printfnotemarkA}}
\_doc ----------------------------
The \`\fnotetext` calls \^`\_opfootnote` which is equivalent to plain \TeX/
\^`\vfootnote`. It creates new data to Insert \^`\footins`. The only
difference is that we can propagate a macro parameter into the Insert group
before the text is printed (see section \ref[output]).
This propagated macro is \`\_fnset` which sets smaller fonts.
Note that \^`\vfootnote` and \^`\_opfootnote` don't read the text as a
parameter but during the normal horizontal mode. This is the reason why catcode
changes (for example in-line verbatim) can be used here.
\_cod ----------------------------
\_def\_fnotetext{\_incr\_gfnotenum \_incr\_lfnotenum % global increment
\_ifpgfnote \_openref \_fi
\_wref \_Xfnote{}%
\_ifpgfnote \_ifcsname _fn:\_the\_gfnotenum \_endcsname \_else
\_opwarning{unknown \_noexpand\fnote mark. TeX me again}%
\_incr\_unresolvedrefs
\_fi\_fi
\_opfootnote\_fnset\_printfnotemarkB
}
\_def\_fnset{\_everypar={}\_scalemain \_typoscale[800/800]}
\_public \fnote \fnotemark \fnotetext ;
\_doc -----------------------------
By default \`\mnote``{<text>}` are in right margin at odd pages and they are in left
margin at even pages. The `\mnote` macro saves its position to `.ref`
file as \`\_Xmnote` without parameter. We define `\_mn:<mnotenum>` as
`\right` or `\left` when the `.ref` file is read.
The `\ifnum 0`$\le$`0#2` trick returns true if `<pageno>` has a numeric type and false
if it is a non-numeric type (Roman numeral, for example). We prefer to use
`<pageno>`, but only if it has the numeric type. We use `<gpageno>` in other cases.
\_cod -----------------------------
\_newcount\_mnotenum \_mnotenum=0 % global counter of mnotes
\_def \_Xmnote {\_incr\_mnotenum \_ea \_XmnoteA \_currpage}
\_def \_XmnoteA #1#2{% #1=<gpageno> #2=<pageno>
\_sxdef{_mn:\_the\_mnotenum}{\_ifodd\_numtype{#2}{#1} \_right \_else \_left \_fi}}
\_def \_numtype #1#2{\_ifnum 0<0#1 #1\_else #2\_fi}
\_doc -----------------------------
User can declare \`\fixmnotes``\left` or \^`\fixmnotes``\right`. It defines
\`\_mnotesfixed` as `\_left` or `\_right` which declares the placement
of all marginal notes and such declaration has a precedence.
\_cod -----------------------------
\_def \_fixmnotes #1{\_edef\_mnotesfixed{\_cs{_\_csstring #1}}}
\_public \fixmnotes ;
\_doc -----------------------------
The \`\_mnoteD``{<text>}` macro sets the position of the marginal note.
The outer box of marginal note has zero width and zero depth and it is appended
after current line using `\vadjust` primitive or it is inverted to vertical mode
as a box with `\vskip-\baselineskip` followed.
\_cod -----------------------------
\_def\_mnote #1#{\_ifx^#1^\_else \_mnoteC#1\_end \_fi \_mnoteD}
\_def\_mnoteC up#1\_end{\_mnoteskip=#1\_relax} % \mnote up<dimen> {<text>} syntax
\_long\_def\_mnoteD#1{\_ifvmode {\_mnoteA{#1}}\_nobreak\_vskip-\_baselineskip \_else
\_lower\_dp\_strutbox\_hbox{}\_vadjust{\_kern-\_dp\_strutbox \_mnoteA{#1}\_kern\_dp\_strutbox}%
\_fi
}
\_public \mnote ;
\_doc -----------------------------
The \`\mnoteskip` is a dimen value that denotes the vertical shift of marginal
note from its normal position. A positive value means shift up, negative
down. The `\mnoteskip` register is set to zero
after the marginal note is printed. The new syntax `\mnote up<dimen>{<text>}`
is possible too, but public `\mnoteskip` is kept for backward compatibility.
\_cod -----------------------------
\_newdimen\_mnoteskip
\_public \mnoteskip ;
\_doc -----------------------------
The \`\_mnoteA` macro does the real work. The \`\_lrmnote``{<left>}{<right>}`
uses only first or only second parameter depending on the left or right
marginal note.
\_cod -----------------------------
\_long\_def\_mnoteA #1{\_incr\_mnotenum
\_ifx\_mnotesfixed\_undefined
\_ifcsname _mn:\_the\_mnotenum \_endcsname
\_edef\_mnotesfixed{\_cs{_mn:\_the\_mnotenum}}%
\_else
\_opwarning{unknown \_noexpand\mnote side. TeX me again}\_openref
\_incr\_unresolvedrefs
\_def\_mnotesfixed{\_right}%
\_fi\_fi
\_hbox to0pt{\_wref\_Xmnote{}\_everypar={}%
\_lrmnote{\_kern-\_mnotesize \_kern-\_mnoteindent}{\_kern\_hsize \_kern\_mnoteindent}%
\_vbox to0pt{\_vss \_setbox0=\_vtop{\_hsize=\_mnotesize
\_lrmnote{\_leftskip=0pt plus 1fill \_rightskip=0pt}
{\_rightskip=0pt plus 1fil \_leftskip=0pt}%
{\_the\_everymnote\_noindent#1\_endgraf}}%
\_dp0=0pt \_box0 \_kern\_mnoteskip \_global\_mnoteskip=0pt}\_hss}%
}
\_def \_lrmnote#1#2{\_ea\_ifx\_mnotesfixed\_left #1\_else #2\_fi}
\_doc -----------------------------
We don't want to process `\fnote`, `\fnotemark`, `\mnote` in TOC, headlines
nor outlines.
\_cod -----------------------------
\_regmacro {\_def\fnote#1{}} {\_def\fnote#1{}} {\_def\fnote#1{}}
\_regmacro {\_def\fnotemark#1{}} {\_def\fnotemark#1{}} {\_def\fnotemark#1{}}
\_regmacro {\_def\mnote#1{}} {\_def\mnote#1{}} {\_def\mnote#1{}}
\_endcode % -------------------------------------
2020-05-26 \mnote up<dimen> implemented
2020-03-20 released
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