fix(ui): sort dms on message create (#835)

internal/ui/chat/guilds_tree.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"slices"
 
 	"github.com/ayn2op/arikawa/v3/discord"
 	"github.com/ayn2op/arikawa/v3/gateway"
@@ -87,6 +88,19 @@ func (gt *guildsTree) updateDMNodeStyle(userID discord.UserID) {
 	gt.setNodeLineStyle(node, gt.channelNodeStyle(*channel))
 }
 
+func (gt *guildsTree) moveDMToFront(channelID discord.ChannelID) {
+	if gt.dmRootNode == nil {
+		return
+	}
+
+	node := gt.channelNodeByID[channelID]
+	children := gt.dmRootNode.Children()
+	if index := slices.Index(children, node); index > 0 {
+		copy(children[1:index+1], children[:index])
+		children[0] = node
+	}
+}
+
 func (gt *guildsTree) createFolderNode(folder gateway.GuildFolder, guildsByID map[discord.GuildID]*gateway.GuildCreateEvent) {
 	name := "Folder"
 	if folder.Name != "" {

internal/ui/chat/guilds_tree_test.go

@@ -0,0 +1,53 @@
+package chat
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/ayn2op/arikawa/v3/discord"
+	"github.com/ayn2op/arikawa/v3/gateway"
+	"github.com/ayn2op/tview/tree"
+)
+
+func TestMessageCreatePromotesDMChannel(t *testing.T) {
+	firstID := discord.ChannelID(1)
+	secondID := discord.ChannelID(2)
+	thirdID := discord.ChannelID(3)
+
+	first := tree.NewNode("first").SetReference(firstID)
+	second := tree.NewNode("second").SetReference(secondID)
+	third := tree.NewNode("third").SetReference(thirdID)
+	dmRoot := tree.NewNode("Direct Messages").SetChildren([]*tree.Node{first, second, third})
+	m := Model{guildsTree: &guildsTree{
+		dmRootNode: dmRoot,
+		channelNodeByID: map[discord.ChannelID]*tree.Node{
+			firstID:  first,
+			secondID: second,
+			thirdID:  third,
+		},
+	}}
+
+	m.onMessageCreate(&gateway.MessageCreateEvent{Message: discord.Message{ChannelID: thirdID}})
+
+	want := []*tree.Node{third, first, second}
+	if !slices.Equal(dmRoot.Children(), want) {
+		t.Fatalf("children = %v, want %v", dmRoot.Children(), want)
+	}
+}
+
+func TestMessageCreateIgnoresUnrenderedDMChannel(t *testing.T) {
+	firstID := discord.ChannelID(1)
+	first := tree.NewNode("first").SetReference(firstID)
+	dmRoot := tree.NewNode("Direct Messages").SetChildren([]*tree.Node{first})
+	m := Model{guildsTree: &guildsTree{
+		dmRootNode:      dmRoot,
+		channelNodeByID: map[discord.ChannelID]*tree.Node{},
+	}}
+
+	m.onMessageCreate(&gateway.MessageCreateEvent{Message: discord.Message{ChannelID: 2}})
+
+	children := dmRoot.Children()
+	if len(children) != 1 || children[0] != first {
+		t.Fatalf("children = %v, want the original DM node", children)
+	}
+}

internal/ui/chat/state.go

@@ -96,6 +96,10 @@ func (m *Model) onReady(event *gateway.ReadyEvent) tview.Cmd {
 }
 
 func (m *Model) onMessageCreate(message *gateway.MessageCreateEvent) tview.Cmd {
+	if !message.GuildID.IsValid() {
+		m.guildsTree.moveDMToFront(message.ChannelID)
+	}
+
 	selectedChannel, ok := m.SelectedChannel()
 	if ok && selectedChannel.ID == message.ChannelID {
 		m.removeTyper(message.Author.ID)