tui: handle text wrapping ourselves, add ctrl+w wrap toggle

Gets rid of those pesky trailing characters

pkg/tui/tui.go

@@ -23,6 +23,7 @@ import (
 	"github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
+	"github.com/muesli/reflow/wordwrap"
 )
 
 type focusState int
@@ -59,6 +60,7 @@ type model struct {
 
 	// ui state
 	focus           focusState
+	wrap            bool     // whether message content is wrapped to viewport width
 	status          string   // a general status message
 	highlightCache  []string // a cache of syntax highlighted message content
 	messageOffsets  []int
@@ -156,6 +158,9 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			}
 		case "ctrl+p":
 			m.persistence = !m.persistence
+		case "ctrl+w":
+			m.wrap = !m.wrap
+			m.updateContent()
 		case "q":
 			if m.focus != focusInput {
 				return m, tea.Quit
@@ -403,6 +408,7 @@ func initialModel(ctx *lmcli.Context, convShortname string) model {
 		replyChan:      make(chan models.Message),
 		replyChunkChan: make(chan string),
 
+		wrap:            true,
 		selectedMessage: -1,
 	}
 
@@ -696,7 +702,7 @@ func (m *model) setMessageContents(i int, content string) {
 
 func (m *model) updateContent() {
 	atBottom := m.content.AtBottom()
-	m.content.SetContent(conversationStyle.Render(m.conversationView()))
+	m.content.SetContent(m.conversationView())
 	if atBottom {
 		// if we were at bottom before the update, scroll with the output
 		m.content.GotoBottom()
@@ -757,8 +763,15 @@ func (m *model) conversationView() string {
 			} else {
 				highlighted = m.highlightCache[i]
 			}
-			contents := messageStyle.Width(m.content.Width).Render(highlighted)
-			sb.WriteString(contents)
+			var contents string
+			if m.wrap {
+				wrapWidth := m.content.Width - messageStyle.GetHorizontalPadding() - 2
+				wrapped := wordwrap.String(highlighted, wrapWidth)
+				contents = wrapped
+			} else {
+				contents = highlighted
+			}
+			sb.WriteString(messageStyle.Width(0).Render(contents))
 			lineCnt += lipgloss.Height(contents)
 		}
 
@@ -767,7 +780,7 @@ func (m *model) conversationView() string {
 			lineCnt += 1
 		}
 	}
-	return sb.String()
+	return conversationStyle.Render(sb.String())
 }
 
 func Launch(ctx *lmcli.Context, convShortname string) error {