Remove callback from List renderer event

Split List into two events: BeginList and EndList, removing the need for
callback.

block.go

@@ -1050,19 +1050,18 @@ func (p *parser) dliPrefix(data []byte) int {
 func (p *parser) list(out *bytes.Buffer, data []byte, flags ListType) int {
 	i := 0
 	flags |= ListItemBeginningOfList
-	work := func() {
-		for i < len(data) {
-			skip := p.listItem(out, data[i:], &flags)
-			i += skip
+	p.r.BeginList(out, flags)
 
-			if skip == 0 || flags&ListItemEndOfList != 0 {
-				break
-			}
-			flags &= ^ListItemBeginningOfList
+	for i < len(data) {
+		skip := p.listItem(out, data[i:], &flags)
+		i += skip
+		if skip == 0 || flags&ListItemEndOfList != 0 {
+			break
 		}
+		flags &= ^ListItemBeginningOfList
 	}
 
-	p.r.List(out, work, flags)
+	p.r.EndList(out, flags)
 	return i
 }
 

html.go

@@ -345,7 +345,9 @@ func (options *Html) TableCell(out *bytes.Buffer, text []byte, align int) {
 func (options *Html) Footnotes(out *bytes.Buffer, text func()) {
 	out.WriteString("<div class=\"footnotes\">\n")
 	options.HRule(out)
-	options.List(out, text, ListTypeOrdered)
+	options.BeginList(out, ListTypeOrdered)
+	text()
+	options.EndList(out, ListTypeOrdered)
 	out.WriteString("</div>\n")
 }
 
@@ -372,7 +374,7 @@ func (options *Html) FootnoteItem(out *bytes.Buffer, name, text []byte, flags Li
 	out.WriteString("</li>\n")
 }
 
-func (options *Html) List(out *bytes.Buffer, text func(), flags ListType) {
+func (options *Html) BeginList(out *bytes.Buffer, flags ListType) {
 	doubleSpace(out)
 
 	if flags&ListTypeDefinition != 0 {
@@ -382,7 +384,9 @@ func (options *Html) List(out *bytes.Buffer, text func(), flags ListType) {
 	} else {
 		out.WriteString("<ul>")
 	}
-	text()
+}
+
+func (r *Html) EndList(out *bytes.Buffer, flags ListType) {
 	if flags&ListTypeDefinition != 0 {
 		out.WriteString("</dl>\n")
 	} else if flags&ListTypeOrdered != 0 {

latex.go

@@ -98,13 +98,15 @@ func (options *Latex) HRule(out *bytes.Buffer) {
 	out.WriteString("\n\\HRule\n")
 }
 
-func (options *Latex) List(out *bytes.Buffer, text func(), flags ListType) {
+func (r *Latex) BeginList(out *bytes.Buffer, flags ListType) {
 	if flags&ListTypeOrdered != 0 {
 		out.WriteString("\n\\begin{enumerate}\n")
 	} else {
 		out.WriteString("\n\\begin{itemize}\n")
 	}
-	text()
+}
+
+func (r *Latex) EndList(out *bytes.Buffer, flags ListType) {
 	if flags&ListTypeOrdered != 0 {
 		out.WriteString("\n\\end{enumerate}\n")
 	} else {

markdown.go

@@ -166,7 +166,8 @@ type Renderer interface {
 	BeginHeader(out *bytes.Buffer, level int, id string) int
 	EndHeader(out *bytes.Buffer, level int, id string, tocMarker int)
 	HRule(out *bytes.Buffer)
-	List(out *bytes.Buffer, text func(), flags ListType)
+	BeginList(out *bytes.Buffer, flags ListType)
+	EndList(out *bytes.Buffer, flags ListType)
 	ListItem(out *bytes.Buffer, text []byte, flags ListType)
 	Paragraph(out *bytes.Buffer, text func())
 	Table(out *bytes.Buffer, header []byte, body []byte, columnData []int)