Typst writer improvements.

+ Fix non-decimal enumerated lists.
+ Fix endnotes ending with code blocks.
+ Improve default template to use a typst template.
+ Factor out definitions and typst template into partials.
+ Properly escape backslash and quote inside double quotes.
+ Update tests.

data/templates/default.typst

@@ -1,58 +1,54 @@
-#set page(
+$definitions.typst()$
+
+$if(template)$
+#import "$template$": conf
+$else$
+$template.typst()$
+$endif$
+
+#show: doc => conf(
+$if(title)$
+  title: [$title$],
+$endif$
+$if(author)$
+  authors: (
+$for(author)$
+$if(author.name)$
+    ( name: [$author.name$],
+      affiliation: [$author.affiliation$],
+      email: [$author.email$] ),
+$else$
+    ( name: [$author$],
+      affiliation: [],
+      email: [] ),
+$endif$
+$endfor$
+    ),
+$endif$
+$if(date)$
+  date: [$date$],
+$endif$
+$if(abstract)$
+  abstract: [$abstract$],
+$endif$
+$if(margin)$
+  margin: ($for(margin/pairs)$$margin.key$: $margin.value$,$endfor$),
+$endif$
 $if(papersize)$
   paper: "$papersize$",
-$endif$
-  numbering: "1"
-)
-#set par(justify: true)
-#set text(
-$if(lang)$
-  lang: "$lang$",
 $endif$
 $if(mainfont)$
-  font: "$mainfont$",
+  font: ("$mainfont$",),
 $endif$
 $if(fontsize)$
-  size: $fontsize$,
+  fontsize: $fontsize$,
 $endif$
+$if(section-numbering)$
+  sectionnumbering: "$section-numbering$",
+$endif$
+  cols: $if(columns)$$columns$$else$1$endif$,
+  doc,
 )
-#set heading(
-$if(numbering)$
-  numbering: "$numbering$"
-$endif$
-)
-
-#align(center)[#block(inset: 2em)[
-  #text(weight: "bold", size: 18pt)[$title$] \
-$for(author)$
-  $author$ \
-$endfor$
-$if(date)$
-  $date$
-$endif$
-]]
-
-#let definition(term, ..defs) = [
-  #strong(term) \
-  #(defs.pos().join("\n"))
-]
-
-#let blockquote(body) = [
-  #set text( size: 0.92em )
-  #block(inset: (left: 1.5em, top: 0.2em, bottom: 0.2em))[#body]
-]
-
-#let horizontalrule = [
-  #line(start: (25%,0%), end: (75%,0%))
-]
-
-#let endnote(num, contents) = [
-  #stack(dir: ltr, spacing: 3pt, super[#num], contents)
-]
-
-$if(columns)$
-#show: doc => columns($columns$, doc)
-$endif$
 
 $for(header-includes)$
 $header-includes$
@@ -71,6 +67,7 @@ $endif$
 
 $body$
 
+$if(notes)$
 #v(1em)
 #block[
 #horizontalrule
@@ -79,6 +76,7 @@ $body$
 
 $notes$
 ]
+$endif$
 $if(bibliographystyle)$
 
 #set bibliography(style: "$bibliographystyle$")

data/templates/definitions.typst

@@ -0,0 +1,18 @@
+// Some definitions presupposed by pandoc's typst output.
+#let definition(term, ..defs) = [
+  #strong(term) \
+  #(defs.pos().join("\n"))
+]
+
+#let blockquote(body) = [
+  #set text( size: 0.92em )
+  #block(inset: (left: 1.5em, top: 0.2em, bottom: 0.2em))[#body]
+]
+
+#let horizontalrule = [
+  #line(start: (25%,0%), end: (75%,0%))
+]
+
+#let endnote(num, contents) = [
+  #stack(dir: ltr, spacing: 3pt, super[#num], contents)
+]

data/templates/template.typst

@@ -0,0 +1,73 @@
+#let conf(
+  title: none,
+  authors: none,
+  date: none,
+  abstract: none,
+  cols: 1,
+  margin: (x: 1.25in, y: 1.25in),
+  paper: "us-letter",
+  lang: none,
+  font: none,
+  fontsize: 11pt,
+  sectionnumbering: none,
+  doc,
+) = {
+  set page(
+    paper: paper,
+    margin: margin,
+    numbering: "1",
+  )
+  set par(justify: true)
+  if lang != none {
+    set text(lang: lang)
+  }
+  if font != none {
+    set text(font: font)
+  }
+  if fontsize != none {
+    set text(size: fontsize)
+  }
+  if sectionnumbering != none {
+    set heading(numbering: sectionnumbering)
+  }
+
+  if title != none {
+    align(center)[#block(inset: 2em)[
+      #text(weight: "bold", size: 1.5em)[#title]
+    ]]
+  }
+
+  if authors != none {
+    let count = authors.len()
+    let ncols = calc.min(count, 3)
+    grid(
+      columns: (1fr,) * ncols,
+      row-gutter: 1.5em,
+      ..authors.map(author =>
+          align(center)[
+            #author.name \
+            #author.affiliation \
+            #author.email
+          ]
+      )
+    )
+  }
+
+  if date != none {
+    align(center)[#block(inset: 1em)[
+      #date
+    ]]
+  }
+
+  if abstract != none {
+    block(inset: 2em)[
+    #text(weight: "semibold")[Abstract] #h(1em) #abstract
+    ]
+  }
+
+  if cols == 1 {
+    doc
+  } else {
+    columns(cols, doc)
+  }
+}