add pinned command

commands/pinned.go

@@ -1,12 +1,49 @@
 package commands
 
-import tempest "github.com/Amatsagu/Tempest"
+import (
+	"encoding/json"
+	"fmt"
+	"math/rand"
+
+	tempest "github.com/Amatsagu/Tempest"
+)
 
 var Pinned tempest.Command = tempest.Command{
   Name: "pinned",
   Description: "will show a random pinned message",
   Options: []tempest.Option{},
   SlashCommandHandler: func(itx tempest.CommandInteraction) {
+    messages, err := getPinnedMessages(itx.Client.Rest, itx.ChannelId.String())
+    if err != nil {
+      itx.SendLinearReply(err.Error(), false)
+      return
+    }
 
+    messagesCount := len(messages)
+
+    if messagesCount == 0 {
+      itx.SendLinearReply("no pinned messages", false)
+      return
+    }
+
+    idx := rand.Intn(messagesCount) 
+
+    itx.Client.SendMessage(itx.ChannelId, messages[idx])
   },
 }
+
+func getPinnedMessages(rest tempest.Rest, channelID string) ([]tempest.Message, error) {
+  route := fmt.Sprintf("/channels/%s/pins", channelID)
+  bytes, err := rest.Request("GET", route, nil)
+  if err != nil {
+    return nil, err
+  }
+
+  messages := []tempest.Message{}
+  if err = json.Unmarshal(bytes, &messages); err != nil {
+    return nil, err
+  }
+
+  return messages, nil
+}
+