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// Copyright © 2013-14 Steve Francia <spf@spf13.com>.
//
// Licensed under the Simple Public License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://opensource.org/licenses/Simple-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hugolib
import (
"errors"
"fmt"
"github.com/spf13/cast"
"github.com/spf13/hugo/helpers"
"github.com/spf13/viper"
"html/template"
"math"
"path"
"reflect"
)
type Pager struct {
number int
*paginator
}
type pagers []*Pager
var paginatorEmptyPages Pages
type paginator struct {
paginatedPages []Pages
pagers
paginationURLFactory
total int
size int
source interface{}
options []interface{}
}
type paginationURLFactory func(int) string
// PageNumber returns the current page's number in the pager sequence.
func (p *Pager) PageNumber() int {
return p.number
}
// URL returns the URL to the current page.
func (p *Pager) URL() template.HTML {
return template.HTML(p.paginationURLFactory(p.PageNumber()))
}
// Url is deprecated. Will be removed in 0.15.
func (p *Pager) Url() template.HTML {
helpers.Deprecated("Paginator", ".Url", ".URL")
return p.URL()
}
// Pages returns the elements on this page.
func (p *Pager) Pages() Pages {
if len(p.paginatedPages) == 0 {
return paginatorEmptyPages
}
return p.paginatedPages[p.PageNumber()-1]
}
// NumberOfElements gets the number of elements on this page.
func (p *Pager) NumberOfElements() int {
return len(p.Pages())
}
// HasPrev tests whether there are page(s) before the current.
func (p *Pager) HasPrev() bool {
return p.PageNumber() > 1
}
// Prev returns the pager for the previous page.
func (p *Pager) Prev() *Pager {
if !p.HasPrev() {
return nil
}
return p.pagers[p.PageNumber()-2]
}
// HasNext tests whether there are page(s) after the current.
func (p *Pager) HasNext() bool {
return p.PageNumber() < len(p.paginatedPages)
}
// Next returns the pager for the next page.
func (p *Pager) Next() *Pager {
if !p.HasNext() {
return nil
}
return p.pagers[p.PageNumber()]
}
// First returns the pager for the first page.
func (p *Pager) First() *Pager {
return p.pagers[0]
}
// Last returns the pager for the last page.
func (p *Pager) Last() *Pager {
return p.pagers[len(p.pagers)-1]
}
// Pagers returns a list of pagers that can be used to build a pagination menu.
func (p *paginator) Pagers() pagers {
return p.pagers
}
// PageSize returns the size of each paginator page.
func (p *paginator) PageSize() int {
return p.size
}
// TotalPages returns the number of pages in the paginator.
func (p *paginator) TotalPages() int {
return len(p.paginatedPages)
}
// TotalNumberOfElements returns the number of elements on all pages in this paginator.
func (p *paginator) TotalNumberOfElements() int {
return p.total
}
func splitPages(pages Pages, size int) []Pages {
var split []Pages
for low, j := 0, len(pages); low < j; low += size {
high := int(math.Min(float64(low+size), float64(len(pages))))
split = append(split, pages[low:high])
}
return split
}
// Paginator gets this Node's paginator if it's already created.
// If it's not, one will be created with all pages in Data["Pages"].
func (n *Node) Paginator(options ...interface{}) (*Pager, error) {
pagerSize, err := resolvePagerSize(options...)
if err != nil {
return nil, err
}
var initError error
n.paginatorInit.Do(func() {
if n.paginator != nil {
return
}
pagers, err := paginatePages(n.Data["Pages"], pagerSize, n.URL)
if err != nil {
initError = err
}
if len(pagers) > 0 {
// the rest of the nodes will be created later
n.paginator = pagers[0]
n.paginator.source = "paginator"
n.paginator.options = options
n.Site.addToPaginationPageCount(uint64(n.paginator.TotalPages()))
}
})
if initError != nil {
return nil, initError
}
return n.paginator, nil
}
// Paginator on Page isn't supported, calling this yields an error.
func (p *Page) Paginator(options ...interface{}) (*Pager, error) {
return nil, errors.New("Paginators not supported for content pages.")
}
// Paginate on Page isn't supported, calling this yields an error.
func (p *Page) Paginate(seq interface{}, options ...interface{}) (*Pager, error) {
return nil, errors.New("Paginators not supported for content pages.")
}
// Paginate gets this Node's paginator if it's already created.
// If it's not, one will be created with the qiven sequence.
// Note that repeated calls will return the same result, even if the sequence is different.
func (n *Node) Paginate(seq interface{}, options ...interface{}) (*Pager, error) {
pagerSize, err := resolvePagerSize(options...)
if err != nil {
return nil, err
}
var initError error
n.paginatorInit.Do(func() {
if n.paginator != nil {
return
}
pagers, err := paginatePages(seq, pagerSize, n.URL)
if err != nil {
initError = err
}
if len(pagers) > 0 {
// the rest of the nodes will be created later
n.paginator = pagers[0]
n.paginator.source = seq
n.paginator.options = options
n.Site.addToPaginationPageCount(uint64(n.paginator.TotalPages()))
}
})
if initError != nil {
return nil, initError
}
if n
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