ParagraphReader: allow separating paragraphs with multiple newlines

fixes Debian/pk4#8

Author: stapelberg

control/parse.go

@@ -198,6 +198,10 @@ func (p *ParagraphReader) Next() (*Paragraph, error) {
 		}
 
 		if line == "\n" || line == "\r\n" {
+			if len(paragraph.Order) == 0 {
+				/* Skip over any number of blank lines between paragraphs. */
+				continue
+			}
 			/* Lines are ended by a blank line; so we're able to go ahead
 			 * and return this guy as-is. All set. Done. Finished. */
 			return &paragraph, nil

control/parse_test.go

@@ -133,6 +133,23 @@ Para: three
 	assert(t, len(blocks) == 3)
 }
 
+func TestMultipleNewlines(t *testing.T) {
+	// Reader {{{
+	reader, err := control.NewParagraphReader(strings.NewReader(`Para: one
+
+
+Para: two
+
+Para: three
+`), nil)
+	// }}}
+	isok(t, err)
+
+	blocks, err := reader.All()
+	isok(t, err)
+	assert(t, len(blocks) == 3)
+}
+
 func TestParagraphSet(t *testing.T) {
 	para := control.Paragraph{
 		Order:  nil,