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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \fnote {Footnotes, marginal notes OpTeX <2020-03-19>} % loaded in format
\_doc -----------------------------
\begitems
* `\_gfnotenum` is conter which counts footnotes globaly in the document.
whole document, chapters, pages.
* `\_lfnotenum` is counter which counts footnotes at each chapter from one.
It is used for local page footnote counters too.
* `\_ifpgfnote` says that footnote numbers are counted on each page from
one. We need to run `\openref` in such case.
* `\fnotenum` is a macro which expands to footnote number counted in declared part.
\enditems
\_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† 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
footnote itself, then you can define `\_printfnotemarkA` and `\_printfnotemarkB`.
The following example shows an implementation of hyperlinked footnotes
(from text to footnote and bacward):
\begtt
\def\_printfnotemarkA{\ilink[fnB:\the\gfnotenum]{\_printfnotemark}\dest[fnA::\the\gfnotenum]}
\def\_printfnotemarkB{\ilink[fnA:\the\gfnotenum]{\_printfnotemark}\dest[fnB::\the\gfnotenum]}
\endtt
\_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
\_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 `\_pgfnote` to zero.
\_cod ----------------------------
\_def \_Xfnote {\_incr\_lfnotenum \_incr\_gfnotenum
\_sxdef{_fn:\_the\_gfnotenum}{\_the\_lfnotenum}}
\_doc ----------------------------
The `\fnote {<text>}` macro is simple, but `\fnotemark`, `\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 are able to propagate a macro into Insert group
before the text is printed (see section \ref[output]).
This propageted macro is `\_fnset` which applies the `\everyfonte` and sets
smaller fonts.
Note that `\vfootnote` and `\_opfootnote` does't read the text as a
parameter but during normal horizontal mode. This is reason why catcode
changes (for example in-line verbaptim) 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}
\_fi\_fi
\_opfootnote\_fnset\_printfnotemarkB
}
\_def\_fnset{\_everypar={}\_the\_everyfnote \_scalemain \_typoscale[800/800]}
\_public \fnote \fnotemark \fnotetext ;
\_doc -----------------------------
By default `\mnote` 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 teturs true if <pageno> has numeric type and false
if it is non-numeric type (romannnumeral, for example). We prefer to use
<pageno>, but only if it has 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 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 -----------------------------
\_long\_def\_mnote#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 `\_mnoteA` macro does the real work. The `\_lrmnote{<left>}{<right>}`
uses only first or only second parameter dependng 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
\_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 % -------------------------------------
|
