Add support for markdown to HTML conversion (matrix). Closes #663 (#670)

This uses our own gomatrix lib with the SendHTML function which
adds HTML to formatted_body in matrix.
golang-commonmark is used to convert markdown into valid HTML.

2 files changed, 9 insertions, 2 deletions

diff --git a/bridge/helper/helper.go b/bridge/helper/helper.go
index d9acb3d5..12a587f0 100644
--- a/bridge/helper/helper.go
+++ b/bridge/helper/helper.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/sirupsen/logrus"
+	"gitlab.com/golang-commonmark/markdown"
 )
 
 func DownloadFile(url string) (*[]byte, error) {
@@ -151,3 +152,8 @@ func ClipMessage(text string, length int) string {
 	}
 	return text
 }
+
+func ParseMarkdown(input string) string {
+	md := markdown.New(markdown.XHTMLOutput(true), markdown.Breaks(true))
+	return (md.RenderToString([]byte(input)))
+}
diff --git a/bridge/matrix/matrix.go b/bridge/matrix/matrix.go
index 6ac41d53..12f50e8d 100644
--- a/bridge/matrix/matrix.go
+++ b/bridge/matrix/matrix.go
@@ -3,6 +3,7 @@ package bmatrix
 import (
 	"bytes"
 	"fmt"
+	"html"
 	"mime"
 	"regexp"
 	"strings"
@@ -112,8 +113,8 @@ func (b *Bmatrix) Send(msg config.Message) (string, error) {
 	// Edit message if we have an ID
 	// matrix has no editing support
 
-	// Post normal message
-	resp, err := b.mc.SendText(channel, msg.Username+msg.Text)
+	// Post normal message with HTML support (eg riot.im)
+	resp, err := b.mc.SendHTML(channel, msg.Text, html.EscapeString(msg.Username)+helper.ParseMarkdown(msg.Text))
 	if err != nil {
 		return "", err
 	}