add rfc plugin

plugins/plugins.go

@@ -230,5 +230,6 @@ var Plugs = Plugins{
 	&Toki{},
 	&Version{},
 	&Wb{},
+	&RFC{},
 	&Weather{},
 }

plugins/rfc.go

@@ -0,0 +1,47 @@
+package plugins
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/matrix-org/gomatrix"
+)
+
+// RFC sends rfc urls when someone references an rfc 
+type RFC struct {
+}
+
+// Descr describes this plugin
+func (h *RFC) Descr() string {
+	return "Produces a link to tools.ietf.org."
+}
+
+// Re matches our man format
+func (h *RFC) Re() string {
+	return `(?i)^rfc\s?([0-9]+)$`
+}
+
+// Match checks for our man page re
+func (h *RFC) Match(_, msg string) bool {
+	re := regexp.MustCompile(h.Re())
+	return re.MatchString(msg)
+}
+
+// SetStore does nothing in RFC
+func (h *RFC) SetStore(_ PluginStore) {}
+
+// RespondText sends back a man page.
+func (h *RFC) RespondText(c *gomatrix.Client, ev *gomatrix.Event, _, post string) error {
+	re := regexp.MustCompile(h.Re())
+	rfcNum := re.ReplaceAllString(post, "$1")
+	if rfcNum != "" {
+		return SendText(c, ev.RoomID, fmt.Sprintf("https://tools.ietf.org/html/rfc%s", rfcNum))
+	}
+
+	return nil
+}
+
+// Name RFC
+func (h *RFC) Name() string {
+	return "RFC"
+}