Unifies pagination template usage (#6531) (#6533)

modules/context/pagination.go

@@ -0,0 +1,50 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import (
+	"fmt"
+	"html/template"
+	"net/url"
+	"strings"
+
+	"github.com/Unknwon/paginater"
+)
+
+// Pagination provides a pagination via Paginater and additional configurations for the link params used in rendering
+type Pagination struct {
+	Paginater *paginater.Paginater
+	urlParams []string
+}
+
+// NewPagination creates a new instance of the Pagination struct
+func NewPagination(total int, page int, issueNum int, numPages int) *Pagination {
+	p := &Pagination{}
+	p.Paginater = paginater.New(total, page, issueNum, numPages)
+	return p
+}
+
+// AddParam adds a value from context identified by ctxKey as link param under a given paramKey
+func (p *Pagination) AddParam(ctx *Context, paramKey string, ctxKey string) {
+	_, exists := ctx.Data[ctxKey]
+	if !exists {
+		return
+	}
+	paramData := fmt.Sprintf("%v", ctx.Data[ctxKey]) // cast interface{} to string
+	urlParam := fmt.Sprintf("%s=%v", url.QueryEscape(paramKey), url.QueryEscape(paramData))
+	p.urlParams = append(p.urlParams, urlParam)
+}
+
+// GetParams returns the configured URL params
+func (p *Pagination) GetParams() template.URL {
+	return template.URL(strings.Join(p.urlParams[:], "&"))
+}
+
+// SetDefaultParams sets common pagination params that are often used
+func (p *Pagination) SetDefaultParams(ctx *Context) {
+	p.AddParam(ctx, "sort", "SortType")
+	p.AddParam(ctx, "q", "Keyword")
+	p.AddParam(ctx, "tab", "TabName")
+}