From 363c2522f227f4eb6185b1b2e24ce052be283749 Mon Sep 17 00:00:00 2001
From: Christian Rocha <christian@rocha.is>
Date: Thu, 9 Apr 2020 18:21:17 -0400
Subject: [PATCH] Helper function for paginating slices

---
 pager/pager.go | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/pager/pager.go b/pager/pager.go
index 4b4b215..79b64d1 100644
--- a/pager/pager.go
+++ b/pager/pager.go
@@ -49,6 +49,20 @@ func (m *Model) SetTotalPages(items int) int {
 	return n
 }
 
+// GetSliceBounds is a helper function for paginating slices. Pass the length
+// of the slice you're rendering and you'll receive the start and end bounds
+// corresponding the to pagination. For example:
+//
+//     bunchOfStuff := []stuff{...}
+//     start, end := model.GetSliceBounds(len(bunchOfStuff))
+//     sliceToRender := bunchOfStuff[start:end]
+//
+func (m *Model) GetSliceBounds(length int) (start int, end int) {
+	start = m.Page * m.PerPage
+	end = min(m.Page*m.PerPage+m.PerPage, length)
+	return start, end
+}
+
 func (m *Model) prevPage() {
 	if m.Page > 0 {
 		m.Page--
@@ -148,3 +162,10 @@ func dotsView(m Model) string {
 func arabicView(m Model) string {
 	return fmt.Sprintf(m.ArabicFormat, m.Page+1, m.TotalPages)
 }
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}