enable Smartypants for md rendering

backend/app/store/comment_test.go

@@ -34,6 +34,10 @@ func TestComment_Sanitize(t *testing.T) {
 				User: User{ID: "id", Name: "xyz"},
 			},
 		},
+		{
+			inp: Comment{Text: "blah & & 123 — —"},
+			out: Comment{Text: `blah & & 123 — —`},
+		},
 	}
 
 	for n, tt := range tbl {

backend/app/store/formatter.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 
 	"github.com/PuerkitoBio/goquery"
-	blackfriday "gopkg.in/russross/blackfriday.v2"
+	bf "gopkg.in/russross/blackfriday.v2"
 )
 
 // CommentFormatter implements all generic formatting ops on comment
@@ -40,10 +40,15 @@ func (f *CommentFormatter) Format(c Comment) Comment {
 
 // FormatText converts text with markdown processor, applies external converters and shortens links
 func (f *CommentFormatter) FormatText(txt string) (res string) {
-	mdExt := blackfriday.NoIntraEmphasis | blackfriday.Tables | blackfriday.FencedCode |
-		blackfriday.Strikethrough | blackfriday.SpaceHeadings | blackfriday.HardLineBreak |
-		blackfriday.BackslashLineBreak | blackfriday.Autolink
-	res = string(blackfriday.Run([]byte(txt), blackfriday.WithExtensions(mdExt)))
+	mdExt := bf.NoIntraEmphasis | bf.Tables | bf.FencedCode |
+		bf.Strikethrough | bf.SpaceHeadings | bf.HardLineBreak |
+		bf.BackslashLineBreak | bf.Autolink
+
+	rend := bf.NewHTMLRenderer(bf.HTMLRendererParameters{
+		Flags: bf.Smartypants | bf.SmartypantsFractions | bf.SmartypantsDashes | bf.SmartypantsAngledQuotes,
+	})
+
+	res = string(bf.Run([]byte(txt), bf.WithExtensions(mdExt), bf.WithRenderer(rend)))
 
 	for _, conv := range f.converters {
 		res = conv.Convert(res)

backend/app/store/formatter_test.go

@@ -17,7 +17,7 @@ func TestFormatter_FormatText(t *testing.T) {
 	}{
 		{"", "!converted"},
 		{"12345 abc", "<p>12345 abc</p>\n!converted"},
-		{"**xyz** _aaa_", "<p><strong>xyz</strong> <em>aaa</em></p>\n!converted"},
+		{"**xyz** _aaa_ - \"sfs\"", "<p><strong>xyz</strong> <em>aaa</em> – «sfs»</p>\n!converted"},
 		{
 			"http://127.0.0.1/some-long-link/12345/678901234567890", "<p><a href=\"http://127.0.0.1/some-long-link/12345/678901234567890\">http://127.0.0.1/some-long-link/12345/6789012...</a></p>\n!converted",
 		},