1 files changed, 46 insertions, 0 deletions
diff --git a/viewport/scroll.go b/viewport/scroll.go
new file mode 100644
index 0000000..809fe17
--- /dev/null
+++ b/viewport/scroll.go
@@ -0,0 +1,46 @@
+package viewport
+
+import (
+	"github.com/charmbracelet/lipgloss"
+	"pik/menu/style"
+	"strings"
+)
+
+var (
+	ScrollTop          = StyleBarBackground.Render("╷")
+	ScrollSpace        = StyleBarBackground.Render("│")
+	ScrollBarTopEnd    = StyleBar.Render("╓")
+	ScrollBar          = StyleBar.Render("║")
+	ScrollBarBottomEnd = StyleBar.Render("╙")
+	ScrollBottom       = StyleBarBackground.Render("╵")
+)
+
+var (
+	StyleBar = style.New(func() lipgloss.Style {
+		return lipgloss.NewStyle()
+	})
+	StyleBarBackground = style.New(func() lipgloss.Style {
+		return StyleBar.Get().Faint(true)
+	})
+)
+
+func WithScroll(input string, barBegin int, barEnd int) string {
+	lines := strings.Split(input, "\n")
+	for i, line := range lines {
+		selection := ScrollSpace
+		switch {
+		case i == barBegin:
+			selection = StyleBar.Render(ScrollBarTopEnd)
+		case i == 0:
+			selection = StyleBarBackground.Render(ScrollTop)
+		case i == barEnd:
+			selection = StyleBar.Render(ScrollBarBottomEnd)
+		case i > barBegin && i < barEnd:
+			selection = StyleBar.Render(ScrollBar)
+		case i == len(lines)-1:
+			selection = StyleBar.Render(ScrollBottom)
+		}
+		lines[i] = selection + " " + line
+	}
+	return strings.Join(lines, "\n")
+}