Refactor packages to have more idiomatic code base

ui/pagination.go

@@ -0,0 +1,46 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package ui
+
+const (
+	nbItemsPerPage = 100
+)
+
+type pagination struct {
+	Route        string
+	Total        int
+	Offset       int
+	ItemsPerPage int
+	ShowNext     bool
+	ShowPrev     bool
+	NextOffset   int
+	PrevOffset   int
+}
+
+func (c *Controller) getPagination(route string, total, offset int) pagination {
+	nextOffset := 0
+	prevOffset := 0
+	showNext := (total - offset) > nbItemsPerPage
+	showPrev := offset > 0
+
+	if showNext {
+		nextOffset = offset + nbItemsPerPage
+	}
+
+	if showPrev {
+		prevOffset = offset - nbItemsPerPage
+	}
+
+	return pagination{
+		Route:        route,
+		Total:        total,
+		Offset:       offset,
+		ItemsPerPage: nbItemsPerPage,
+		ShowNext:     showNext,
+		NextOffset:   nextOffset,
+		ShowPrev:     showPrev,
+		PrevOffset:   prevOffset,
+	}
+}