%% This is part of OpTeX project, see http://petr.olsak.net/optex \_codedecl \begitems {Lists: begitems, enditems <2020-04-21>} % 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. User can set initial value of `\itemnum` to another value after `\beitems` if he/she want. \nl Each level of nested lists is indented by new `\iindent` from left. 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*{\_startitem} \_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:` macros. You can re-define then or define more such macros. The \`\style` `` does \`\_printitem``={\_item:}`. More exactly: \^`\begitems` does `\_printitem=`\^`\defaultitem` first, then \`\style` `` does \`\_printitem``={\_item:}` 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``{}` returns the ``s lowercase letter from the alphabet.\nl \`\_fullrectangle``{}` prints full rectangle with given ``. \_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 ; \_endcode % ------------------------------------- 2020-04-21 \isnextchar\par added to \enditems 2020-03-18 introduced