git: a creation gate that never writes history, a git tab with Paperclip's worktree scan, and a warning line in every pane

tui/frame_test.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
 )
 
@@ -56,3 +57,58 @@ func TestTruncateVisibleKeepsStylingAndWidth(t *testing.T) {
 		t.Fatalf("truncation should say it truncated: %q", got)
 	}
 }
+
+func TestBannerIsDrawnOnceAndKeepsTheHeight(t *testing.T) {
+	defer func(prev string) { bannerText = prev }(bannerText)
+	bannerText = "no worktrees — this folder is not a git repository"
+	const w, h = 80, 24
+
+	// A screen with three panels side by side, the way the board is drawn.
+	one := panel{title: "a", width: 26, height: h - 2}.render([]string{"x"})
+	two := panel{title: "b", width: 26, height: h - 2}.render([]string{"y"})
+	three := panel{title: "c", width: 26, height: h - 2}.render([]string{"z"})
+	inner := strings.Join([]string{
+		strings.Repeat(" ", w),
+		sideBySide(one, two, three),
+		"footer",
+	}, "\n")
+
+	b := bannerModel{inner: stubModel{view: inner}, width: w, height: h}
+	got := lines(b.View())
+	if len(got) != h {
+		t.Fatalf("got %d lines, want %d", len(got), h)
+	}
+	if n := strings.Count(strings.Join(got, "\n"), "no worktrees"); n != 1 {
+		t.Fatalf("the warning appears %d times, want once", n)
+	}
+	if !strings.Contains(strings.Join(got, "\n"), "footer") {
+		t.Fatal("the key hints were dropped; only the title line should give way")
+	}
+	if lipgloss.Width(got[0]) != w {
+		t.Fatalf("the warning line is %d wide, want %d", lipgloss.Width(got[0]), w)
+	}
+}
+
+type stubModel struct{ view string }
+
+func (s stubModel) Init() tea.Cmd                       { return nil }
+func (s stubModel) Update(tea.Msg) (tea.Model, tea.Cmd) { return s, nil }
+func (s stubModel) View() string                        { return s.view }
+
+func sideBySide(parts ...string) string {
+	rows := make([][]string, len(parts))
+	for i, p := range parts {
+		rows[i] = lines(p)
+	}
+	var out []string
+	for r := range rows[0] {
+		var b strings.Builder
+		for _, cols := range rows {
+			if r < len(cols) {
+				b.WriteString(cols[r])
+			}
+		}
+		out = append(out, b.String())
+	}
+	return strings.Join(out, "\n")
+}