1 files changed, 97 insertions, 0 deletions
diff --git a/vendor/maunium.net/go/mautrix/reply.go b/vendor/maunium.net/go/mautrix/reply.go
new file mode 100644
index 0000000..5e3af92
--- /dev/null
+++ b/vendor/maunium.net/go/mautrix/reply.go
@@ -0,0 +1,97 @@
+// Copyright 2018 Tulir Asokan
+package mautrix
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"golang.org/x/net/html"
+)
+
+var HTMLReplyFallbackRegex = regexp.MustCompile(`^<mx-reply>[\s\S]+?</mx-reply>`)
+
+func TrimReplyFallbackHTML(html string) string {
+	return HTMLReplyFallbackRegex.ReplaceAllString(html, "")
+}
+
+func TrimReplyFallbackText(text string) string {
+	if !strings.HasPrefix(text, "> ") || !strings.Contains(text, "\n") {
+		return text
+	}
+
+	lines := strings.Split(text, "\n")
+	for len(lines) > 0 && strings.HasPrefix(lines[0], "> ") {
+		lines = lines[1:]
+	}
+	return strings.TrimSpace(strings.Join(lines, "\n"))
+}
+
+func (content *Content) RemoveReplyFallback() {
+	if len(content.GetReplyTo()) > 0 {
+		if content.Format == FormatHTML {
+			content.FormattedBody = TrimReplyFallbackHTML(content.FormattedBody)
+		}
+		content.Body = TrimReplyFallbackText(content.Body)
+	}
+}
+
+func (content *Content) GetReplyTo() string {
+	if content.RelatesTo != nil {
+		return content.RelatesTo.InReplyTo.EventID
+	}
+	return ""
+}
+
+const ReplyFormat = `<mx-reply><blockquote>
+<a href="https://matrix.to/#/%s/%s">In reply to</a>
+<a href="https://matrix.to/#/%s">%s</a>
+%s
+</blockquote></mx-reply>
+`
+
+func (evt *Event) GenerateReplyFallbackHTML() string {
+	body := evt.Content.FormattedBody
+	if len(body) == 0 {
+		body = html.EscapeString(evt.Content.Body)
+	}
+
+	senderDisplayName := evt.Sender
+
+	return fmt.Sprintf(ReplyFormat, evt.RoomID, evt.ID, evt.Sender, senderDisplayName, body)
+}
+
+func (evt *Event) GenerateReplyFallbackText() string {
+	body := evt.Content.Body
+	lines := strings.Split(strings.TrimSpace(body), "\n")
+	firstLine, lines := lines[0], lines[1:]
+
+	senderDisplayName := evt.Sender
+
+	var fallbackText strings.Builder
+	fmt.Fprintf(&fallbackText, "> <%s> %s", senderDisplayName, firstLine)
+	for _, line := range lines {
+		fmt.Fprintf(&fallbackText, "\n> %s", line)
+	}
+	fallbackText.WriteString("\n\n")
+	return fallbackText.String()
+}
+
+func (content *Content) SetReply(inReplyTo *Event) {
+	if content.RelatesTo == nil {
+		content.RelatesTo = &RelatesTo{}
+	}
+	content.RelatesTo.InReplyTo = InReplyTo{
+		EventID: inReplyTo.ID,
+		RoomID:  inReplyTo.RoomID,
+	}
+
+	if content.MsgType == MsgText || content.MsgType == MsgNotice {
+		if len(content.FormattedBody) == 0 || content.Format != FormatHTML {
+			content.FormattedBody = html.EscapeString(content.Body)
+			content.Format = FormatHTML
+		}
+		content.FormattedBody = inReplyTo.GenerateReplyFallbackHTML() + content.FormattedBody
+		content.Body = inReplyTo.GenerateReplyFallbackText() + content.Body
+	}
+}