Initial, working but only with viewport height adjusted a little bit

ui/update.go

@@ -0,0 +1,50 @@
+package ui
+
+import (
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyMsg:
+		return m.HandleKeyMsg(msg)
+	case tea.WindowSizeMsg:
+		m.width = msg.Width
+		m.height = msg.Height
+	case StdoutMsg:
+		m.messages = append(m.messages, string(msg))
+		return m, ListenBridge(m.listenBridge)
+	}
+
+	return m, nil
+}
+
+func (m Model) HandleKeyMsg(key tea.KeyMsg) (tea.Model, tea.Cmd) {
+	switch key.String() {
+	case "q", "ctrl+c":
+		return m, tea.Quit
+	case "k":
+		m.cursor = clamp(0, m.height, m.cursor-1)
+	case "j":
+		m.cursor = clamp(0, min(m.height, m.lineCount-1), m.cursor+1)
+	case "b":
+		m.bridge.Breakpoint(m.currentFile, m.cursor)
+		if file, ok := m.breakpoints[m.currentFile]; ok {
+			m.breakpoints[m.currentFile] = append(file, m.cursor+1)
+		} else {
+			m.breakpoints[m.currentFile] = []int{
+				m.cursor + 1,
+			}
+		}
+	case "c":
+		m.bridge.Continue()
+	}
+
+	return m, nil
+}
+
+func clamp(minimum, maximum, val int) int {
+	val = max(minimum, val)
+	val = min(maximum, val)
+	return val
+}