From 78b3a9514fecc0d25b8e5fba67ffa71d238b3eae Mon Sep 17 00:00:00 2001
From: Andrea Zagli <azagli@libero.it>
Date: Mon, 11 Apr 2022 16:07:09 +0200
Subject: [PATCH] Primo import. Funzione Paginazione.

---
 .gitignore |  1 +
 go.mod     |  3 ++
 zakegg.go  | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 go.mod
 create mode 100644 zakegg.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b3d54b3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.~*~
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0d28a66
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module saetta.ns0.it/zakegg
+
+go 1.18
diff --git a/zakegg.go b/zakegg.go
new file mode 100644
index 0000000..a0a5589
--- /dev/null
+++ b/zakegg.go
@@ -0,0 +1,95 @@
+package zakegg
+
+import (
+	"fmt"
+	"math"
+)
+
+func Paginazione(start int, rows int, rows_x_page int, url string) string {
+	var page_start int
+	var page_end int
+	var page int
+	var pages int
+
+	if rows_x_page == 0 {
+		return ""
+	}
+
+	ret := ""
+
+	if rows > rows_x_page {
+		ret += `<nav>
+		        <ul class="pagination justify-content-center">`
+
+		pages = rows /rows_x_page
+		if (pages * rows_x_page) < rows {
+			pages++
+		}
+		if start > 0 {
+			ret += fmt.Sprintf(`<li class="page-item">
+					            <a class="page-link" href="%s" aria-label="Prima" title="Prima">
+					            <span aria-hidden="true">&laquo;</span>
+					            </a>
+					            </li>`, url)
+			ret += fmt.Sprintf(`<li class="page-item">
+					            <a class="page-link" href="%s/%d" aria-label="Precedente" title="Precedente">
+					            <span aria-hidden="true">&lsaquo;</span>
+					            </a>
+					            </li>`, url, start - rows_x_page)
+		} else {
+			ret += `<li class="page-item disabled">
+					<a class="page-link" href="#" aria-label="Prima" title="Prima">
+					<span aria-hidden="true">&laquo;</span>
+					</a>
+					</li>`
+			ret += `<li class="page-item disabled">
+					<a class="page-link" href="#" aria-label="Precedente" title="Predecente">
+					<span aria-hidden="true">&lsaquo;</span>
+					</a>
+					</li>`
+		}
+
+		page_start = int(math.Max(0, float64(int(start / rows_x_page) - 5)))
+		page_end = page_start + 10
+		if page_end > pages {
+			page_end = pages
+			page_start = int(math.Max(0, float64(page_end - 10)))
+		}
+		for page = page_start; page < page_end; page++ {
+			if (start / rows_x_page) == page {
+				ret += fmt.Sprintf("<li class=\"page-item active\"><a class=\"page-link\" href=\"#\">%d</a></li>\n", page + 1)
+			} else {
+				ret += fmt.Sprintf("<li class=\"page-item\"><a class=\"page-link\" href=\"%s/%d\">%d</a></li>\n", url, page * rows_x_page, page + 1)
+			}
+		}
+
+		if start < int(rows / rows_x_page) * rows_x_page {
+			ret += fmt.Sprintf(`<li class="page-item">
+					            <a class="page-link" href="%s/%d" aria-label="Successiva" title="Successiva">
+					            <span aria-hidden="true">&rsaquo;</span>
+					            </a>
+					            </li>`, url, start + rows_x_page)
+			ret += fmt.Sprintf(`<li class="page-item">
+					            <a class="page-link" href="%s/%d" aria-label="Ultima" title="Ultima">
+					            <span aria-hidden="true">&raquo;</span>
+					            </a>
+					            </li>`, url, (rows / rows_x_page) * rows_x_page)
+		} else {
+			ret += `<li class="page-item disabled">
+					<a class="page-link" href="#" aria-label="Successiva" title="Successiva">
+					<span aria-hidden="true">&rsaquo;</span>
+					</a>
+					</li>`
+			ret += `<li class="page-item disabled">
+					<a class="page-link" href="#" aria-label="Ultima" title="Ultima">
+					<span aria-hidden="true">&raquo;</span>
+					</a>
+					</li>`
+		}
+
+		ret += `</ul>
+			    </nav>`
+	}
+
+	return ret
+}
-- 
2.49.0