support two-argument form of .It

.It [&lang] itemid [itemlabel]
where itemlabel defaults to itemid

notes/cvtdat.sh

@@ -43,18 +43,9 @@ bn=$1
 
 if (( dl )); then
 	ul=dl
-	function htm_li {
-		local itemkey=${|tohtm "$1";}
-		print -nru4 -- "<dt>${itemkey:-✹}</dt><dd$xmllang${1:+ id=\"$itemkey\"}>"
-		xnl=
-	}
 	li=dd
 else
 	ul=ul
-	function htm_li {
-		print -nru4 -- "<li$xmllang${1:+ id=\"${|tohtm "$1";}\"}>"
-		xnl=
-	}
 	li=li
 fi
 
@@ -272,14 +263,23 @@ while IFS= read -r line; do
 	(It)
 		endit
 		getlang
-		htm_li "$line"
-		if [[ -z $line ]]; then
+		getcw
+		if [[ -z $cw ]]; then
+			[[ $li = li ]] || print -nru4 -- "<dt>✹</dt>"
+			print -nru4 -- "<$li$xmllang>"
 			print -ru5 -- '\item[\TwelweStar\hfill]'"$ltxlang{%"
+		elif [[ -z $line ]]; then
+			[[ $li = li ]] || print -nru4 -- "<dt>${|tohtm "$cw";}</dt>"
+			print -nru4 -- "<$li$xmllang id=\"${|tohtm "$cw";}\">"
+			print -ru5 -- "\\bibitem{${|totex "$cw";}}$ltxlang{%"
 		else
-			print -ru5 -- '\bibitem{'"${|totex "$line";}}$ltxlang{%"
+			[[ $li = li ]] || print -nru4 -- "<dt>${|tohtm "$line";}</dt>"
+			print -nru4 -- "<$li$xmllang id=\"${|tohtm "$cw";}\">"
+			print -ru5 -- "\\bibitem[${|totex "$line";}]{${|totex "$cw";}}$ltxlang{%"
 		fi
-		init=1
+		xnl=
 		tnl=' '
+		init=1
 		;;
 	(a)
 		getcw