markup/goldmark: Update the CJK extension to allow specifying line break styles

This commit follows https://github.com/yuin/goldmark/pull/411

markup/goldmark/convert.go

@@ -140,7 +140,11 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 	if cfg.Extensions.CJK.Enable {
 		opts := []extension.CJKOption{}
 		if cfg.Extensions.CJK.EastAsianLineBreaks {
-			opts = append(opts, extension.WithEastAsianLineBreaks())
+			if cfg.Extensions.CJK.EastAsianLineBreaksStyle == "css3draft" {
+				opts = append(opts, extension.WithEastAsianLineBreaks(extension.EastAsianLineBreaksCSS3Draft))
+			} else {
+				opts = append(opts, extension.WithEastAsianLineBreaks())
+			}
 		}
 
 		if cfg.Extensions.CJK.EscapedSpace {

markup/goldmark/convert_test.go

@@ -675,6 +675,60 @@ eastAsianLineBreaks=true
 	c.Assert(got, qt.Contains, "<p>私は太郎です。プログラミングが好きで、運動が苦手です。</p>\n")
 }
 
+func TestConvertCJKWithExtensionWithEastAsianLineBreaksOptionWithSimple(t *testing.T) {
+	c := qt.New(t)
+
+	content := `
+私は太郎です。
+Programming が好きで、
+運動が苦手です。
+`
+
+	confStr := `
+[markup]
+[markup.goldmark]
+[markup.goldmark.extensions.CJK]
+enable=true
+eastAsianLineBreaks=true
+eastAsianLineBreaksStyle="simple"
+`
+
+	cfg := config.FromTOMLConfigString(confStr)
+	conf := testconfig.GetTestConfig(nil, cfg)
+
+	b := convert(c, conf, content)
+	got := string(b.Bytes())
+
+	c.Assert(got, qt.Contains, "<p>私は太郎です。\nProgramming が好きで、運動が苦手です。</p>\n")
+}
+
+func TestConvertCJKWithExtensionWithEastAsianLineBreaksOptionWithStyle(t *testing.T) {
+	c := qt.New(t)
+
+	content := `
+私は太郎です。
+Programming が好きで、
+運動が苦手です。
+`
+
+	confStr := `
+[markup]
+[markup.goldmark]
+[markup.goldmark.extensions.CJK]
+enable=true
+eastAsianLineBreaks=true
+eastAsianLineBreaksStyle="css3draft"
+`
+
+	cfg := config.FromTOMLConfigString(confStr)
+	conf := testconfig.GetTestConfig(nil, cfg)
+
+	b := convert(c, conf, content)
+	got := string(b.Bytes())
+
+	c.Assert(got, qt.Contains, "<p>私は太郎です。Programming が好きで、運動が苦手です。</p>\n")
+}
+
 func TestConvertCJKWithExtensionWithEscapedSpaceOption(t *testing.T) {
 	c := qt.New(t)
 

markup/goldmark/goldmark_config/config.go

@@ -44,9 +44,10 @@ var Default = Config{
 		LinkifyProtocol: "https",
 		TaskList:        true,
 		CJK: CJK{
-			Enable:              false,
-			EastAsianLineBreaks: false,
-			EscapedSpace:        false,
+			Enable:                   false,
+			EastAsianLineBreaks:      false,
+			EastAsianLineBreaksStyle: "simple",
+			EscapedSpace:             false,
 		},
 	},
 	Renderer: Renderer{
@@ -118,6 +119,9 @@ type CJK struct {
 	// Whether softline breaks between east asian wide characters should be ignored.
 	EastAsianLineBreaks bool
 
+	// Styles of Line Breaking of EastAsianLineBreaks: "simple" or "css3draft"
+	EastAsianLineBreaksStyle string
+
 	// Whether a '\' escaped half-space(0x20) should not be rendered.
 	EscapedSpace bool
 }