refactor: break up long inline expressions

internal/config/ui.go

@@ -234,8 +234,19 @@ func defaultUI() UIConfig {
 		Border:      BorderUIConfig{Enabled: true, Padding: [4]int{0, 0, 1, 1}, NormalSet: round, ActiveSet: round},
 		GuildsTree:  GuildsTreeUIConfig{TreeUIConfig{Graphics: true}, true},
 		MembersTree: TreeUIConfig{Graphics: true},
-		ScrollBar:    ScrollBarUIConfig{SymbolSet: SymbolSetWrapper{boxDrawing}, Visibility: ScrollBarVisibilityWrapper{viewport.ScrollBarVisibilityAutomatic}},
-		MessagesList: MessagesListUIConfig{Spacing: 1, ReplyIndicator: ">", ForwardedIndicator: "<", ImageProtocol: "auto", Attachments: attachments, Avatars: AvatarsUIConfig{Preview: true, Height: 2}, Grouping: GroupingUIConfig{Enabled: true, Interval: 10 * time.Minute}},
+		ScrollBar: ScrollBarUIConfig{
+			SymbolSet:  SymbolSetWrapper{boxDrawing},
+			Visibility: ScrollBarVisibilityWrapper{viewport.ScrollBarVisibilityAutomatic},
+		},
+		MessagesList: MessagesListUIConfig{
+			Spacing:            1,
+			ReplyIndicator:     ">",
+			ForwardedIndicator: "<",
+			ImageProtocol:      "auto",
+			Attachments:        attachments,
+			Avatars:            AvatarsUIConfig{Preview: true, Height: 2},
+			Grouping:           GroupingUIConfig{Enabled: true, Interval: 10 * time.Minute},
+		},
 		MentionsList: MentionsListUIConfig{MinWidth: 20},
 	}
 }

internal/ui/chat/composer/model.go

@@ -187,7 +187,16 @@ func (m Model) footer() string {
 // isBound reports whether key is one of the composer's keybinds.
 func (m Model) isBound(key tview.KeyMsg) bool {
 	k := m.cfg.Keybinds.Composer
-	if keybind.Matches(key, k.Paste.Keybind, k.Send.Keybind, k.OpenEditor.Keybind, k.OpenFilePicker.Keybind, k.Cancel.Keybind, k.TabComplete.Keybind, k.ToggleReplyMention.Keybind, k.Undo.Keybind) {
+	if keybind.Matches(key,
+		k.Paste.Keybind,
+		k.Send.Keybind,
+		k.OpenEditor.Keybind,
+		k.OpenFilePicker.Keybind,
+		k.Cancel.Keybind,
+		k.TabComplete.Keybind,
+		k.ToggleReplyMention.Keybind,
+		k.Undo.Keybind,
+	) {
 		return true
 	}
 	return keybind.Matches(key, k.EditLast.Keybind) && m.canEditLastMessage()

internal/ui/chat/guildstree/model.go

@@ -223,7 +223,8 @@ func (m Model) createGuildNode(parent *tree.Node, guild discord.Guild) {
 }
 
 func (m Model) createChannelNode(parent *tree.Node, channel discord.Channel) {
-	if channel.Type != discord.DirectMessage && channel.Type != discord.GroupDM && channel.Type != discord.GuildCategory && !m.state.HasPermissions(channel.ID, discord.PermissionViewChannel) {
+	needsViewPermission := !slices.Contains([]discord.ChannelType{discord.DirectMessage, discord.GroupDM, discord.GuildCategory}, channel.Type)
+	if needsViewPermission && !m.state.HasPermissions(channel.ID, discord.PermissionViewChannel) {
 		return
 	}
 
@@ -372,11 +373,14 @@ func (m Model) voiceChannel(node *tree.Node) *discord.Channel {
 
 // joinable returns why the voice channel of node cannot be joined, or nil if it can be.
 func (m Model) joinable(node *tree.Node, channel discord.Channel) error {
+	// The users in the channel are the children of its node.
+	atUserLimit := channel.VoiceUserLimit > 0 && len(node.Children()) >= int(channel.VoiceUserLimit)
+
 	switch {
 	case !m.state.HasPermissions(channel.ID, discord.PermissionConnect):
 		return errors.New("you are not permitted to connect")
-	// Discord does not answer a request to join a full voice channel.
-	case channel.VoiceUserLimit > 0 && len(node.Children()) >= int(channel.VoiceUserLimit) && !m.state.HasPermissions(channel.ID, discord.PermissionMoveMembers):
+	// Discord does not answer a request to join a full voice channel, unless it is from someone who can move members.
+	case atUserLimit && !m.state.HasPermissions(channel.ID, discord.PermissionMoveMembers):
 		return errors.New("it is full")
 	}
 

internal/ui/chat/memberstree/model.go

@@ -87,7 +87,19 @@ func (m *Model) SetChannel(channel *discord.Channel) tview.Cmd {
 func (m Model) View(focused bool) tview.Widget {
 	onChange := func(current *tree.Node) tview.Msg { return Msg{current} }
 	onSelect := func(n *tree.Node) tview.Msg { return SelectedMsg{Node: n} }
-	return uitree.New(m.root, m.current, m.scrollState, m.cfg, m.cfg.Theme.MembersTree, m.cfg.UI.MembersTree.Graphics, m.cfg.Keybinds.MembersTree, focused, onChange, onSelect).Title("Members")
+	return uitree.New(
+		m.root,
+		m.current,
+		m.scrollState,
+		m.cfg,
+		m.cfg.Theme.MembersTree,
+		m.cfg.UI.MembersTree.Graphics,
+		m.cfg.Keybinds.MembersTree,
+		focused,
+		onChange,
+		onSelect,
+	).
+		Title("Members")
 }
 
 // setCurrentNode selects node and scrolls to it.
@@ -202,11 +214,11 @@ func (m Model) addRecipients(recipients []discord.User) {
 	if me, err := m.state.Cabinet.Me(); err == nil {
 		recipients = append(recipients, *me)
 	}
+	rank := func(user discord.User) int { return statusRank(m.status(discord.NullGuildID, user.ID)) }
+	name := func(user discord.User) string { return strings.ToLower(user.DisplayOrUsername()) }
+	// By status, online first, then by name.
 	slices.SortFunc(recipients, func(a, b discord.User) int {
-		if c := cmp.Compare(statusRank(m.status(discord.NullGuildID, a.ID)), statusRank(m.status(discord.NullGuildID, b.ID))); c != 0 {
-			return c
-		}
-		return strings.Compare(strings.ToLower(a.DisplayOrUsername()), strings.ToLower(b.DisplayOrUsername()))
+		return cmp.Or(cmp.Compare(rank(a), rank(b)), strings.Compare(name(a), name(b)))
 	})
 
 	group := m.addGroup(discord.NullGuildID, gateway.GuildMemberListGroup{ID: "members", Count: uint64(len(recipients))})

internal/ui/chat/messageslist/model.go

@@ -216,12 +216,18 @@ func (m *Model) setMessages(messages []discord.Message) {
 
 func (m *Model) AddMessage(message discord.Message) tview.Cmd {
 	// Appending keeps the items before it as they are, so only the separator of a new day is added rather than all rebuilt.
-	last := len(m.items) - 1
-	separator := m.cfg.DateSeparator.Enabled && (last < 0 || !sameLocalDate(m.items[last].message.Timestamp, message.Timestamp))
+	var previous *discord.Message
+	if last := len(m.items) - 1; last >= 0 {
+		previous = &m.items[last].message
+	}
+
+	separator := m.shouldSeparate(previous, message)
 	if separator {
 		m.items = append(m.items, messageItem{separator: true})
 	}
-	m.items = append(m.items, messageItem{message: message, grouped: last >= 0 && !separator && m.grouped(m.items[last].message, message)})
+
+	grouped := !separator && m.shouldGroup(previous, message)
+	m.items = append(m.items, messageItem{message: message, grouped: grouped})
 	return m.loadPreviews()
 }
 
@@ -388,10 +394,10 @@ func (m Model) renderMessage(message discord.Message, baseStyle tview.Style, wid
 	return text
 }
 
-// grouped reports whether message is drawn under the header of previous, the message before it.
-func (m Model) grouped(previous, message discord.Message) bool {
+// shouldGroup reports whether message is drawn under the header of previous, the message before it, which is nil for the first.
+func (m Model) shouldGroup(previous *discord.Message, message discord.Message) bool {
 	cfg := m.cfg.UI.MessagesList.Grouping
-	return cfg.Enabled &&
+	return cfg.Enabled && previous != nil &&
 		// Replies and system messages start a group, as their header says more than who wrote them.
 		message.Type == discord.DefaultMessage &&
 		(previous.Type == discord.DefaultMessage || previous.Type == discord.InlinedReplyMessage) &&
@@ -404,17 +410,18 @@ func (m Model) grouped(previous, message discord.Message) bool {
 func (m *Model) rebuildItems() {
 	items := make([]messageItem, 0, len(m.items))
 	cursor, target := -1, -1
-	var previous discord.Message
+	var previous *discord.Message
 	for i, item := range m.items {
 		if item.separator {
 			continue
 		}
-		separator := m.cfg.DateSeparator.Enabled && (len(items) == 0 || !sameLocalDate(previous.Timestamp, item.message.Timestamp))
+
+		separator := m.shouldSeparate(previous, item.message)
 		if separator {
 			items = append(items, messageItem{separator: true})
 		}
 		// A message that joins or leaves a group is drawn again, with or without its header.
-		if grouped := len(items) > 0 && !separator && m.grouped(previous, item.message); grouped != item.grouped {
+		if grouped := !separator && m.shouldGroup(previous, item.message); grouped != item.grouped {
 			item.grouped, item.text = grouped, nil
 		}
 		if i == m.cursor {
@@ -424,13 +431,18 @@ func (m *Model) rebuildItems() {
 			target = len(items)
 		}
 		items = append(items, item)
-		previous = item.message
+		previous = &item.message
 	}
 	m.items = items
 	// The selected and target messages only move with the separators, so they are not scrolled to.
 	m.cursor, m.target = cursor, target
 }
 
+// shouldSeparate reports whether a date separator goes before message, as it is the first (previous is nil) or starts a new day.
+func (m Model) shouldSeparate(previous *discord.Message, message discord.Message) bool {
+	return m.cfg.DateSeparator.Enabled && (previous == nil || !sameLocalDate(previous.Timestamp, message.Timestamp))
+}
+
 func sameLocalDate(a discord.Timestamp, b discord.Timestamp) bool {
 	ta := a.Time().In(time.Local)
 	tb := b.Time().In(time.Local)

internal/ui/chat/messageslist/model_test.go

@@ -234,7 +234,7 @@ func TestModelDrawLayout(t *testing.T) {
 	}
 }
 
-func TestModelGrouped(t *testing.T) {
+func TestModelShouldGroup(t *testing.T) {
 	start := time.Date(2026, 9, 1, 12, 0, 0, 0, time.UTC)
 	message := func(author string, after time.Duration, typ discord.MessageType) discord.Message {
 		return discord.Message{Type: typ, Author: discord.User{ID: 2, Username: author}, Timestamp: discord.NewTimestamp(start.Add(after)), Content: "hi"}
@@ -254,7 +254,7 @@ func TestModelGrouped(t *testing.T) {
 		{"after a system message", message("a", 0, discord.ChannelPinnedMessage), message("a", time.Minute, discord.DefaultMessage), false},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := newTestModel(t, testConfig(t)).grouped(tt.previous, tt.message); got != tt.want {
+			if got := newTestModel(t, testConfig(t)).shouldGroup(&tt.previous, tt.message); got != tt.want {
 				t.Fatalf("grouped = %v, want %v", got, tt.want)
 			}
 		})
@@ -263,7 +263,7 @@ func TestModelGrouped(t *testing.T) {
 	cfg := testConfig(t)
 	cfg.Timestamps.Enabled = false
 	ml := newTestModel(t, cfg)
-	if cfg.UI.MessagesList.Grouping.Enabled = false; ml.grouped(previous, previous) {
+	if cfg.UI.MessagesList.Grouping.Enabled = false; ml.shouldGroup(&previous, previous) {
 		t.Fatal("grouped while disabled")
 	}
 	cfg.UI.MessagesList.Grouping.Enabled = true

internal/ui/chat/messageslist/preview.go

@@ -58,7 +58,11 @@ func previewSources(message discord.Message) []previewSource {
 
 // cols returns the preview's width in cells of cellWidth by cellHeight pixels: its own width at most, within the preview box.
 func (s previewSource) cols(cellWidth, cellHeight uint) int {
-	return int(max(min((s.width+cellWidth-1)/cellWidth, previewWidth, s.width*previewHeight*cellHeight/(s.height*cellWidth)), 1))
+	// The columns its own width takes, rounded up, so it is not scaled up.
+	own := (s.width + cellWidth - 1) / cellWidth
+	// The columns at which its height fills the box, so a tall image is not cut off.
+	tall := s.width * previewHeight * cellHeight / (s.height * cellWidth)
+	return int(max(min(own, previewWidth, tall), 1))
 }
 
 // previewCell returns the size of a cell in image pixels: the terminal's for kitty, and one pixel by two for half blocks.

internal/ui/chat/model.go

@@ -368,9 +368,13 @@ func (p paneWidget) Draw(screen tview.Screen, area tview.Rectangle) {
 func (p paneWidget) Handle(msg tview.Msg, area tview.Rectangle) tview.Msg {
 	out := p.child.Handle(msg, area)
 	// Mouse input the pane leaves, but for a press, goes on to the other panes, for a slider dragged out of one to follow the pointer.
-	if mouse, ok := msg.(tview.MouseMsg); ok && area.Contains(mouse.Position()) && (out != msg || mouse.Action == tview.MouseLeftDown) {
-		return paneMsg{pane: p.pane, msg: out, focus: mouse.Action == tview.MouseLeftDown}
+	if mouse, ok := msg.(tview.MouseMsg); ok && area.Contains(mouse.Position()) {
+		pressed := mouse.Action == tview.MouseLeftDown
+		if out != msg || pressed {
+			return paneMsg{pane: p.pane, msg: out, focus: pressed}
 		}
+	}
+
 	// Keys and paste reach only the focused pane, so what it makes of them goes to that pane through route.
 	return out
 }

internal/ui/tree/tree.go

@@ -20,7 +20,16 @@ type ScrollMsg struct {
 }
 
 // New returns a boxed tree of the nodes under root in a viewport.
-func New(root, current *tree.Node, scrollState viewport.ScrollState, cfg *config.Config, theme config.TreeThemeConfig, graphics bool, kbs config.TreeKeybinds, focused bool, onChange, onSelect func(*tree.Node) tview.Msg) box.Widget {
+func New(
+	root, current *tree.Node,
+	scrollState viewport.ScrollState,
+	cfg *config.Config,
+	theme config.TreeThemeConfig,
+	graphics bool,
+	kbs config.TreeKeybinds,
+	focused bool,
+	onChange, onSelect func(*tree.Node) tview.Msg,
+) box.Widget {
 	set := cfg.UI.Border.NormalSet.BorderSet
 	if focused {
 		set = cfg.UI.Border.ActiveSet.BorderSet