add "none standard"/optional headlines to bold

slack.go

@@ -6,10 +6,23 @@ import (
 	"strings"
 )
 
-// Slack returns github markdown converted to slack
-func Slack(markdown string) string {
+// SlackConvertOptions contains options to fine-toon GitHub to Slack markdown convert
+type SlackConvertOptions struct {
+	// Headlines will define if GitHub headlines will be updated to be bold text in slack
+	// there is no headlines as sucks in Slack
+	Headlines bool
+}
+
+// Slack returns github markdown converted to Slack
+func Slack(markdown string, options ...SlackConvertOptions) string {
 	var re *regexp.Regexp
 
+	opt := SlackConvertOptions{}
+	if len(options) > 0 {
+		opt = options[0]
+	}
+
+	// TODO: write proper regex
 	linkRegex := ".*"
 
 	// bold **TEXT**  -> *TEXT*
@@ -55,5 +68,10 @@ func Slack(markdown string) string {
 	re = regexp.MustCompile(`(?m)((\n[ ]{0,})(\*))`)
 	markdown = re.ReplaceAllString(markdown, "$2•")
 
+	if opt.Headlines {
+		re = regexp.MustCompile(`(?m)((^\t?[ ]{0,15}#{1,4}[ ]{1,})(.+))`)
+		markdown = re.ReplaceAllString(markdown, "*$3*")
+	}
+
 	return markdown
 }

slack_test.go

@@ -47,4 +47,23 @@ func TestSlack(t *testing.T) {
  • remove DELETE /v1/message (<https://github.com/foo/boo/issues/121|#121>) (<https://github.com/foo/boo/commit/3523r42|3523r42>)`
 
 	assert.Equal(msgSlack, Slack(msgGithub))
+
+	// test headlines parse
+	optWithHeadlines := SlackConvertOptions{
+		Headlines: true,
+	}
+	assert.Equal("*fooo*", Slack("### fooo", optWithHeadlines))
+	assert.Equal("*Boo foo 123*", Slack(" # Boo foo 123", optWithHeadlines))
+	assert.Equal(`
+*Features*
+`, Slack(`
+	### Features
+`, optWithHeadlines))
+
+	msgSlackHeadlinesBold := `*<https://github.com/foo/boo/compare/v1.49.3...v1.50.0|1.50.0> (2015-02-12)*
+*Features*
+ • add GET /v1/events (<https://github.com/foo/boo/issues/134|#134>) (<https://github.com/foo/boo/commit/1726806|1726806>)
+ • remove DELETE /v1/message (<https://github.com/foo/boo/issues/121|#121>) (<https://github.com/foo/boo/commit/3523r42|3523r42>)`
+
+	assert.Equal(msgSlackHeadlinesBold, Slack(msgGithub, optWithHeadlines))
 }