Implement source block results

To support code block directives like :exports none we need context - i.e. we
need to have the block and it's results at once and can't just render them
independently.

org/block.go

@@ -10,6 +10,7 @@ type Block struct {
 	Name       string
 	Parameters []string
 	Children   []Node
+	Result     Node
 }
 
 type Result struct {
@@ -58,7 +59,7 @@ func (d *Document) parseBlock(i int, parentStop stopFn) (int, Node) {
 	stop := func(d *Document, i int) bool {
 		return i >= len(d.tokens) || (d.tokens[i].kind == "endBlock" && d.tokens[i].content == name)
 	}
-	block, i := Block{name, parameters, nil}, i+1
+	block, i := Block{name, parameters, nil, nil}, i+1
 	if isRawTextBlock(name) {
 		rawText := ""
 		for ; !stop(d, i); i++ {
@@ -73,11 +74,27 @@ func (d *Document) parseBlock(i int, parentStop stopFn) (int, Node) {
 		block.Children = nodes
 		i += consumed
 	}
-	if i < len(d.tokens) && d.tokens[i].kind == "endBlock" && d.tokens[i].content == name {
+	if i >= len(d.tokens) || d.tokens[i].kind != "endBlock" || d.tokens[i].content != name {
+		return 0, nil
+	}
+	if name == "SRC" {
+		consumed, result := d.parseSrcBlockResult(i+1, parentStop)
+		block.Result = result
+		i += consumed
+	}
 	return i + 1 - start, block
 }
+
+func (d *Document) parseSrcBlockResult(i int, parentStop stopFn) (int, Node) {
+	start := i
+	for ; !parentStop(d, i) && d.tokens[i].kind == "text" && d.tokens[i].content == ""; i++ {
+	}
+	if parentStop(d, i) || d.tokens[i].kind != "result" {
 		return 0, nil
 	}
+	consumed, result := d.parseResult(i, parentStop)
+	return (i - start) + consumed, result
+}
 
 func (d *Document) parseExample(i int, parentStop stopFn) (int, Node) {
 	example, start := Example{}, i

org/html_writer.go

@@ -134,6 +134,10 @@ func (w *HTMLWriter) WriteBlock(b Block) {
 		w.WriteString(fmt.Sprintf(`<div class="%s-block">`, strings.ToLower(b.Name)) + "\n")
 		w.WriteString(content + "</div>\n")
 	}
+
+	if b.Result != nil {
+		WriteNodes(w, b.Result)
+	}
 }
 
 func (w *HTMLWriter) WriteResult(r Result) { WriteNodes(w, r.Node) }

org/keyword.go

@@ -150,7 +150,7 @@ func (d *Document) parseInclude(k Keyword) (int, Node) {
 				d.Log.Printf("Bad include %#v: %s", k, err)
 				return k
 			}
-			return Block{strings.ToUpper(kind), []string{lang}, d.parseRawInline(string(bs))}
+			return Block{strings.ToUpper(kind), []string{lang}, d.parseRawInline(string(bs)), nil}
 		}
 	}
 	return 1, Include{k, resolve}

org/org_writer.go

@@ -102,6 +102,11 @@ func (w *OrgWriter) WriteBlock(b Block) {
 		w.WriteString(w.indent)
 	}
 	w.WriteString("#+END_" + b.Name + "\n")
+
+	if b.Result != nil {
+		w.WriteString("\n")
+		WriteNodes(w, b.Result)
+	}
 }
 
 func (w *OrgWriter) WriteResult(r Result) {