add time command

command/time.go

@@ -0,0 +1,54 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/bwmarrin/discordgo"
+	log "github.com/sirupsen/logrus"
+)
+
+const ()
+
+var ()
+
+type (
+	TimeHandler struct{}
+)
+
+func NewTimeHandler() *TimeHandler {
+	var h *TimeHandler = new(TimeHandler)
+	return h
+}
+
+func (h *TimeHandler) Handle(s *discordgo.Session, m *discordgo.MessageCreate) {
+	var tz string
+
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+
+	if !strings.HasPrefix(m.Content, "!time") {
+		return
+	}
+
+	x := strings.SplitN(m.Content, " ", 2)
+
+	if len(x) != 2 {
+		s.ChannelMessageSend(m.ChannelID, "help: `!time TIMEZONE`")
+		return
+	}
+
+	tz = x[1]
+
+	loc, err := time.LoadLocation(tz)
+	if err != nil {
+		log.Warnf("failed to load location: %s", err)
+		return
+	}
+
+	now := time.Now()
+
+	s.ChannelMessageSend(m.ChannelID, fmt.Sprint(now.In(loc)))
+}