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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \begitems {Lists: begitems, enditems <2020-03-18>} % preloaded in format
\_doc -----------------------------
`\aboveliskip` is used above the list of items,
`\belowliskip` is used below the list of items and
`\interliskip` is used between items.
\_cod -----------------------------
\_def\_aboveliskip {\_removelastskip \_penalty-100 \_medskip}
\_def\_belowliskip {\_penalty-200 \_medskip}
\_def\_interliskip {}
\_doc -----------------------------
The `\itemnum` is localy reset to zero in each group declared by
`\begitems`. So nested lists are numbered independently. User can set
initial value of `\itemnum` to another value after `\beitems` if he/she want.
Each level of nested lists is indented by new `\iindent` from left.
Default item mark is `\_printitem`.
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.
\_cod -----------------------------
\_newcount\_itemnum \_itemnum=0
\_newtoks\_printitem
\_def\_begitems{\_par \_ifnum\_lastpenalty<10000 \_aboveliskip \_fi
\_bgroup
\_itemnum=0 \_adef*{\_startitem}
\_advance\_leftskip by\_iindent
\_printitem=\_defaultitem
\_the\_everybegitems
}
\_def\_enditems{\_par\_egroup\_belowliskip}
\_def\_startitem{\_par \_ifnum\_itemnum>0 \_interliskip \_fi
\_advance\_itemnum by1
\_the\_everyitem \_noindent\_llap{\_the\_printitem}\_ignorespaces
}
\_doc -----------------------------
Various item marks are saved in `\_item:<letter>` macros.
You ca re-define then or define more such macros.
The `\style <letter>` does `\_printitem={\_item:<letter>}`.
\_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.
`\_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 \begitems \enditems \style \itemnum ;
\_endcode % -------------------------------------
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