Merge pull request #455 from camdencheek/support-single-tilde-strikethrough

GitHub flavored markdown: support single-tilde strikethrough

Author: yuin

extension/_test/strikethrough.txt

@@ -16,3 +16,12 @@ new paragraph~~.
 <p>This ~~has a</p>
 <p>new paragraph~~.</p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
+
+
+
+3
+//- - - - - - - - -//
+~Hi~ Hello, world!
+//- - - - - - - - -//
+<p><del>Hi</del> Hello, world!</p>
+//= = = = = = = = = = = = = = = = = = = = = = = =//

extension/strikethrough.go

@@ -46,7 +46,7 @@ func (s *strikethroughParser) Trigger() []byte {
 func (s *strikethroughParser) Parse(parent gast.Node, block text.Reader, pc parser.Context) gast.Node {
 	before := block.PrecendingCharacter()
 	line, segment := block.PeekLine()
-	node := parser.ScanDelimiter(line, before, 2, defaultStrikethroughDelimiterProcessor)
+	node := parser.ScanDelimiter(line, before, 1, defaultStrikethroughDelimiterProcessor)
 	if node == nil {
 		return nil
 	}