A plugins/seen.go

@@ -0,0 +1,64 @@
+package plugins
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/dustin/go-humanize"
+	"gopkg.in/irc.v3"
+)
+
+func init() {
+	Register(Seen{})
+}
+
+type Seen struct{}
+
+func (Seen) Triggers() []string {
+	return []string{".seen", ""}
+}
+
+var LastSeen sync.Map
+
+type LastSeenInfo struct {
+	// The last message the user sent.
+	Message string
+	// The last time this user was seen.
+	Time time.Time
+}
+
+func (Seen) Execute(m *irc.Message) (string, error) {
+	LastSeen.Store(m.Name, LastSeenInfo{
+		Message: m.Trailing(),
+		// We just saw the user, so.
+		Time: time.Now(),
+	})
+
+	if strings.HasPrefix(m.Params[1], ".seen") {
+		params := strings.Split(m.Trailing(), " ")
+		if len(params) == 1 {
+			return "Usage: .seen <nickname>", nil
+		}
+
+		if seen, ok := LastSeen.Load(params[1]); ok {
+			humanized := humanize.Time(seen.(LastSeenInfo).Time)
+
+			// Don't want "now ago".
+			if humanized != "now" {
+				humanized = humanized + " ago"
+			}
+
+			return fmt.Sprintf(
+				"\x02%s\x02 was last seen %s, saying: %s",
+				params[1], humanized,
+				seen.(LastSeenInfo).Message,
+			), nil
+		} else {
+			return "I have not seen " + params[1], nil
+		}
+	}
+
+	return "", NoReply
+}