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%% This is part of the OpTeX project, see http://petr.olsak.net/optex
\_codedecl \begitems {Lists: begitems, enditems <2021-03-10>} % preloaded in format
\_doc -----------------------------
\`\_aboveliskip` is used above the list of items,\nl
\`\_belowliskip` is used below the list of items and\nl
\`\_interliskip` is used between items.\nl
\`\_listskipA` is used as `\listskipamount` at level 1 of items.\nl
\`\_listskipB` is used as `\listskipamount` at other levels.\nl
\`\_setlistskip` sets the skip dependent on the current level of items
\_cod -----------------------------
\_def\_aboveliskip {\_removelastskip \_penalty-100 \_vskip\_listskipamount}
\_def\_belowliskip {\_penalty-200 \_vskip\_listskipamount}
\_def\_interliskip {}
\_def\_listskipA {\_medskipamount}
\_def\_listskipB {0pt plus.5\_smallskipamount}
\_def\_setlistskip {%
\_ifnum \_ilevel = 1 \_listskipamount = \_listskipA \_relax
\_else \_listskipamount = \_listskipB \_relax
\_fi}
\_doc -----------------------------
The \`\itemnum` is locally reset to zero in each group declared by
`\begitems`. So nested lists are numbered independently. Users can set
initial value of `\itemnum` to another value after `\beitems` if they want.
\nl
Each level of nested lists is indented by the new `\iindent` from left.
The default item mark is `\_printitem`.
\nl
The \`\begitems` runs `\_aboveliskip` only if we are not near below a title,
where a vertical skip is placed already and where the `\penalty` 11333 is.
It activates `*` and defines it as \`\_startitem`.
\nl
The \`\enditems` runs `\_isnextchar\_par{}{\_noindent}` thus the next
paragraph is without indentation if there is no empty line between
the list and this paragraph (it is similar behavior as after display math).
\_cod -----------------------------
\_newcount\_itemnum \_itemnum=0
\_newtoks\_printitem
\_def\_begitems{\_par
\_bgroup
\_advance \_ilevel by1
\_setlistskip
\_ifnum\_lastpenalty<10000 \_aboveliskip \_fi
\_itemnum=0 \_adef*{\_relax\_ifmmode*\_else\_ea\_startitem\_fi}
\_advance\_leftskip by\_iindent
\_printitem=\_defaultitem
\_the\_everylist \_relax
}
\_def\_enditems{\_par\_belowliskip\_egroup \_isnextchar\_par{}{\_noindent}}
\_def\_startitem{\_par \_ifnum\_itemnum>0 \_interliskip \_fi
\_advance\_itemnum by1
\_the\_everyitem \_noindent\_llap{\_the\_printitem}\_ignorespaces
}
\_public \begitems \enditems \itemnum ;
\_doc ----------------------------
\`\novspaces` sets \`\listskipamount` to 0pt.
\_cod ----------------------------
\_def\_novspaces {\_removelastskip \_listskipamount=0pt \_relax}
\_public \novspaces ;
\_doc -----------------------------
Various item marks are saved in `\_item:<letter>` macros.
You can re-define then or define more such macros.
The \`\style` `<letter>` does \`\_printitem``={\_item:<letter>}`.
More exactly: \^`\begitems` does `\_printitem=`\^`\defaultitem` first,
then \`\style` `<letter>` does \`\_printitem``={\_item:<letter>}`
when it is used and finally, `\_startitem` alias `*` uses `\_printitem`.
\_cod -----------------------------
\_def\_style#1{%
\_ifcsname _item:#1\_endcsname \_printitem=\ea{\_csname _item:#1\_endcsname}%
\_else \_printitem=\_defaultitem \_fi
}
\_sdef{_item:o}{\_raise.4ex\_hbox{$\_scriptscriptstyle\_bullet$} }
\_sdef{_item:-}{- }
\_sdef{_item:n}{\_the\_itemnum. }
\_sdef{_item:N}{\_the\_itemnum) }
\_sdef{_item:i}{(\_romannumeral\_itemnum) }
\_sdef{_item:I}{\_uppercase\_ea{\_romannumeral\_itemnum}\_kern.5em}
\_sdef{_item:a}{\_athe\_itemnum) }
\_sdef{_item:A}{\_uppercase\_ea{\_athe\_itemnum}) }
\_sdef{_item:x}{\_raise.3ex\_fullrectangle{.6ex}\_kern.4em}
\_sdef{_item:X}{\_raise.2ex\_fullrectangle{1ex}\_kern.5em}
\_doc -----------------------------
\`\_athe``{<num>}` returns the `<num>`s lowercase letter from the alphabet.\nl
\`\_fullrectangle``{<dimen>}` prints full rectangle with given `<dimen>`.
\_cod -----------------------------
\_def\_fullrectangle#1{\_hbox{\_vrule height#1 width#1}}
\_def\_athe#1{\_ifcase#1?\_or a\_or b\_or c\_or d\_or e\_or f\_or g\_or h\_or
i\_or j\_or k\_or l\_or m\_or n\_or o\_or p\_or q\_or r\_or s\_or t\_or
u\_or v\_or w\_or x\_or y\_or z\_else ?\_fi
}
\_public \style ;
\_doc -----------------------------
The \`\begblock` macro selects fonts from footnotes \^`\_fnset`
and opens new indentation in a group.
\`\endblock` closes the group.
This is implemented as an counterpart
of Markdown's Blockquotes. Redefine these macros if you want to declare
different design.
The \ulink[http://petr.olsak.net/optex/optex-tricks.html\#greyblock]{\OpTeX/ trick 0031}
shows how to create blocks with grey background splittable to more pages.
\_cod -----------------------------
\_def\_begblock{\_bgroup\_fnset \_medskip \_advance\_leftskip by\_iindent \_firstnoindent}
\_def\_endblock{\_par\_medskip\_egroup\_isnextchar\_par{}{\_noindent}}
\_public \begblock \endblock ;
\_endcode % -------------------------------------
2021-03-10 \_ifmmode*\_else\_ea\_startitem\_fi added to * defintition
2020-04-21 \isnextchar\par added to \enditems
2020-03-18 introduced
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