Add-ish support for tags and mentions in new messages

web/shared/Note.go

@@ -1,8 +1,11 @@
 package webshared
 
 import (
+	"regexp"
 	"time"
 
+	"git.mstar.dev/mstar/goutils/sliceutils"
+
 	"git.mstar.dev/mstar/linstrom/shared"
 	"git.mstar.dev/mstar/linstrom/storage-new/models"
 )
@@ -24,6 +27,8 @@ type Note struct {
 var _ shared.Clonable = &Note{}
 var _ shared.Sanitisable = &Note{}
 
+var mentionsRegex = regexp.MustCompile(`@([a-zA-Z@\._0-9]+)`)
+
 // No test, does nothing currently
 func (note *Note) Sanitize() {
 }
@@ -58,3 +63,17 @@ func (n *Note) FromModel(m *models.Note) {
 	}
 	n.AccessLevel = uint8(m.AccessLevel)
 }
+
+func MentionsFromContent(content string) []string {
+	matches := mentionsRegex.FindAllStringSubmatch(content, -1)
+	if len(matches) == 0 {
+		return []string{}
+	}
+	return sliceutils.Map(matches, func(t []string) string {
+		if len(t) != 2 {
+			return ""
+		} else {
+			return t[1]
+		}
+	})
+}