Enable rich-text messages in matrix channel (#1370)

* Enable rich-text messages in matrix channel

* Fix lint

docs/channels/matrix/README.md

@@ -22,7 +22,8 @@ Add this to `config.json`:
         "enabled": true,
         "text": "Thinking..."
       },
-      "reasoning_channel_id": ""
+      "reasoning_channel_id": "",
+      "message_format": "richtext"
     }
   }
 }
@@ -42,10 +43,12 @@ Add this to `config.json`:
 | group_trigger        | object   | No       | Group trigger strategy (`mention_only` / `prefixes`) |
 | placeholder          | object   | No       | Placeholder message config |
 | reasoning_channel_id | string   | No       | Target channel for reasoning output |
+| message_format       | string   | No       | Output format: `"richtext"` (default) renders markdown as HTML; `"plain"` sends plain text only |
 
 ## 3. Currently Supported
 
-- Text message send/receive
+- Text message send/receive with markdown rendering (bold, italic, headers, code blocks, etc.)
+- Configurable message format (`richtext` / `plain`)
 - Incoming image/audio/video/file download (MediaStore first, local path fallback)
 - Incoming audio normalization into existing transcription flow (`[audio: ...]`)
 - Outgoing image/audio/video/file upload and send

pkg/channels/matrix/matrix.go

@@ -13,6 +13,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/gomarkdown/markdown"
+	mdhtml "github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
 	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/id"
@@ -268,6 +271,12 @@ func (c *MatrixChannel) Stop(ctx context.Context) error {
 	return nil
 }
 
+func markdownToHTML(md string) string {
+	p := parser.NewWithExtensions(parser.CommonExtensions | parser.AutoHeadingIDs)
+	renderer := mdhtml.NewRenderer(mdhtml.RendererOptions{Flags: mdhtml.CommonFlags})
+	return strings.TrimSpace(string(markdown.ToHTML([]byte(md), p, renderer)))
+}
+
 func (c *MatrixChannel) Send(ctx context.Context, msg bus.OutboundMessage) error {
 	if !c.IsRunning() {
 		return channels.ErrNotRunning
@@ -283,16 +292,22 @@ func (c *MatrixChannel) Send(ctx context.Context, msg bus.OutboundMessage) error
 		return nil
 	}
 
-	_, err := c.client.SendMessageEvent(ctx, roomID, event.EventMessage, &event.MessageEventContent{
+	_, err := c.client.SendMessageEvent(ctx, roomID, event.EventMessage, c.messageContent(content))
-		MsgType: event.MsgText,
-		Body:    content,
-	})
 	if err != nil {
 		return fmt.Errorf("matrix send: %w", channels.ErrTemporary)
 	}
 	return nil
 }
 
+func (c *MatrixChannel) messageContent(text string) *event.MessageEventContent {
+	mc := &event.MessageEventContent{MsgType: event.MsgText, Body: text}
+	if c.config.MessageFormat != "plain" {
+		mc.Format = event.FormatHTML
+		mc.FormattedBody = markdownToHTML(text)
+	}
+	return mc
+}
+
 // SendMedia implements channels.MediaSender.
 func (c *MatrixChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessage) error {
 	if !c.IsRunning() {
@@ -482,10 +497,7 @@ func (c *MatrixChannel) EditMessage(ctx context.Context, chatID string, messageI
 		return fmt.Errorf("matrix message ID is empty")
 	}
 
-	editContent := &event.MessageEventContent{
+	editContent := c.messageContent(content)
-		MsgType: event.MsgText,
-		Body:    content,
-	}
 	editContent.SetEdit(id.EventID(messageID))
 
 	_, err := c.client.SendMessageEvent(ctx, roomID, event.EventMessage, editContent)

pkg/channels/matrix/matrix_test.go

@@ -4,12 +4,15 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
 	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/id"
+
+	"github.com/sipeed/picoclaw/pkg/config"
 )
 
 func TestMatrixLocalpartMentionRegexp(t *testing.T) {
@@ -289,3 +292,50 @@ func TestMatrixOutboundContent(t *testing.T) {
 		t.Fatalf("unexpected fallback body: %q", noCaption.Body)
 	}
 }
+
+func TestMarkdownToHTML(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		contains string
+	}{
+		{"bold", "**hello**", "<strong>hello</strong>"},
+		{"italic", "_world_", "<em>world</em>"},
+		{"header", "### Title", "<h3"},
+		{"code block", "```\nfoo()\n```", "<code>"},
+		{"inline code", "`x`", "<code>x</code>"},
+		{"plain text", "just text", "just text"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := markdownToHTML(tt.input)
+			if !strings.Contains(got, tt.contains) {
+				t.Fatalf("markdownToHTML(%q) = %q, want it to contain %q", tt.input, got, tt.contains)
+			}
+		})
+	}
+}
+
+func TestMessageContent(t *testing.T) {
+	richtext := &MatrixChannel{config: config.MatrixConfig{MessageFormat: "richtext"}}
+	plain := &MatrixChannel{config: config.MatrixConfig{MessageFormat: "plain"}}
+	defaultt := &MatrixChannel{config: config.MatrixConfig{}}
+
+	for _, c := range []*MatrixChannel{richtext, defaultt} {
+		mc := c.messageContent("**hi**")
+		if mc.Format != event.FormatHTML {
+			t.Errorf("format %q: expected FormatHTML, got %q", c.config.MessageFormat, mc.Format)
+		}
+		if !strings.Contains(mc.FormattedBody, "<strong>hi</strong>") {
+			t.Errorf("format %q: FormattedBody %q missing <strong>", c.config.MessageFormat, mc.FormattedBody)
+		}
+		if mc.Body != "**hi**" {
+			t.Errorf("format %q: Body should remain plain, got %q", c.config.MessageFormat, mc.Body)
+		}
+	}
+
+	mc := plain.messageContent("**hi**")
+	if mc.Format != "" || mc.FormattedBody != "" {
+		t.Errorf("plain: expected no formatting, got format=%q formattedBody=%q", mc.Format, mc.FormattedBody)
+	}
+}

pkg/config/config.go

@@ -356,6 +356,7 @@ type MatrixConfig struct {
 	AccessToken        string              `json:"access_token"             env:"PICOCLAW_CHANNELS_MATRIX_ACCESS_TOKEN"`
 	DeviceID           string              `json:"device_id,omitempty"      env:"PICOCLAW_CHANNELS_MATRIX_DEVICE_ID"`
 	JoinOnInvite       bool                `json:"join_on_invite"           env:"PICOCLAW_CHANNELS_MATRIX_JOIN_ON_INVITE"`
+	MessageFormat      string              `json:"message_format,omitempty" env:"PICOCLAW_CHANNELS_MATRIX_MESSAGE_FORMAT"`
 	AllowFrom          FlexibleStringSlice `json:"allow_from"               env:"PICOCLAW_CHANNELS_MATRIX_ALLOW_FROM"`
 	GroupTrigger       GroupTriggerConfig  `json:"group_trigger,omitempty"`
 	Placeholder        PlaceholderConfig   `json:"placeholder,omitempty"`